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Sidensjö, SwedenElectrical Specification for Windfarm Substation

Author: Simon Herbert Date: 15 November 2012 Ref: 01986-010215

Prepared: Andrew Cadmore Signed Electronically: 18-Jun-2013

Checked: Daniel Kerr Signed Electronically: 18-Jun-2013

Approved: Neil Mattinson Signed Electronically: 18-Jun-2013

Document Reference: 01986-010215 Issue: 03 - Approved

Revision History

Issue Date Author Nature And Location Of Change01 15 Nov 2012 Simon Herbert First Created02 17 Apr 2013 Andrew Cadmore 7.1, Item 5.(n) - Omission of cable

connections to Communication Masts at both subs. This item is no longer applicable

7.1, Item 18 - Omission of LV connection to Communication Masts at both subs. This item is no longer applicable

7.1, Item 22 - Amended to omit need for CT summation. Responsibility for cable works changed to Grid company.

10. - Items 10, 11 & 12 added 12.5 - HV Switchgear short circuit time

rating clarified 12.8 – 33kV & 130kV VT spec clarified 12.11 - Reactor Q-Factor requirement

clarified. Reference to Annex 7 added. 12.12.2 - Reference to Annex 7 added. 12.14.1 - Circuit breaker fail protection

added 12.14.2 - Omission of requirement to

accept remote trip signal from Turbine 33kV CB arc-detection backup protection. 33kV circuit breaker fail protection added

12.14.3 - 130kV circuit breaker fail protection added. Substation Emergency Stop operation clarified.

12.14.6 - This section is no longer applicable

12.17.2 - Omission of paragraph pertaining to cable connections to Communication Masts at both subs.

12.23.6.2.d) - Omission of reference to substation Communications Masts.

12.25.q) - Omission of reference to 'communications mast'

12.26 - Responsibility for cable workschanged to Grid company. Scope of metering panel supply clarified.

13.2.7 - Omission of need for cable to 'communications masts'

15.4 - 33kV Harmonic Filter Protectionadded

15.5 - New '33kV Earthing Transformer' section added

15.6 - New '33kV Reactor' section added 15.7 to 15.9 - Section numbering altered

to accept inertion of new sections 15.5 & 15.6

15.8 – Minimum cores added


03 18 Jun 2013 Andrew Cadmore 12.5 – 130kV CB operation to be independent single-pole with synchronised point-on-wave control

12.11.1 –Min temp protective feature added


CONTENTS

1. INTRODUCTION...............................................................................................8

2. DESIGN LIFE & DEFECT LIABILITY PERIOD ..............................................................8

3. DESIGN RESPONSIBILITY....................................................................................9

4. APPLICABLE CODES & STANDARDS.......................................................................9

5. ELECTRICAL DESIGN CRITERIA ............................................................................9

6. ENVIRONMENTAL CONDITIONS.......................................................................... 10

6.1 Outdoor Environmental Conditions 10

6.2 Indoor Environmental Conditions 10

7. SCOPE OF WORKS ......................................................................................... 11

7.1 Scope of Works for Sidensjö Wind Farm 11

7.2 Indicative Use Only Drawings 15

8. INTERFACES ................................................................................................ 17

8.1. Design Coordination 17

8.2. HV Interfaces 178.2.1 Switching Responsibility 18

8.3. 33kV Interfaces 188.3.1 33kV Interface at Both Substations 188.3.2 33kV Interface with the MVK1 Metering and Isolation Kiosk 19

8.4. Substation LV Power Supply Interface 19

8.5. Grid Company Remote Telemetry Unit (RTU) Signals Interface 20

8.6. Wind Farm Operator RTU Signals Interface 20

8.7. Communications Interface 20

8.8. Substation Ground Works Interface 21

8.9. Revenue Metering Locations 21

9. ANNEX 1 – APPLICABLE CODES & STANDARDS ....................................................... 22

10. ANNEX 2 – GRID CONNECTION TECHNICAL EXTRACT ............................................... 26

11. ANNEX 3 - ELECTRICAL SYSTEM DESIGN CALCULATIONS & STUDIES............................. 27

11.1. Electrical Calculations, Studies and Models 27

11.2. Protection Studies and Relay Settings 27


11.3. Earthing System & Lightning Protection Calculations 28

11.4. Harmonic Analysis Studies 29

11.5. Reactive Power Compensation Studies 29

11.6. Insulation Coordination Studies 30

12. ANNEX 4 – TECHNICAL SPECIFICATION – ELECTRICAL .............................................. 32

12.1. Introduction 32

12.2. HV Switchyard 32

12.3. HV Surge Arrestors 32

12.4. HV Voltage Transformers 33

12.5. HV Switchgear 33

12.6. HV Current Transformers 34

12.7. 33kV Switchgear 3512.7.1 General 3512.7.2 Standards and Technical Requirements 3612.7.3 33kV Circuit Breakers 3612.7.4 Earthing Switch 37

12.8. 130kV and 33kV Voltage Transformers 38

12.9. 130kV and 33kV Current Transformers 39

12.10. 33kV Surge Arrestors 39

12.11. 33kV Reactive Power Compensation 3912.11.1Reactor Switching 40

12.12. 33kV Neutral Point Equipment 4112.12.1General 4112.12.233kV Earthing Transformers 41

12.13. Interlocking of Switching Devices 4212.13.1 Specific Turbine Interlocking Requirements 43

12.14. Protection Relay Systems 4412.14.1General 4412.14.2Tripping Schemes for 33kV Circuit Breakers 4612.14.3Tripping Schemes for HV Circuit Breakers 4812.14.4Protective Functions 5012.14.5Protection Relay Panel 5212.14.6Protection Interface to Turbines 5212.14.7Protection Interfaces to Grid 53

12.14.7.1 Sidensjö North................................................................................ 5312.14.7.2 Sidensjö South................................................................................ 54

12.14.8Protection Tripping PhIlosophy and Tripping Report 5412.14.9Acceleration of Back-Up Protection 5512.14.10 Grid Transformer On Load Tap Changer Interface and Control 5512.14.11 Drawing Specification 56

12.15. Switchgear Local/Remote Control 5612.15.1General 56

12.16. Monitoring & Control System 5712.16.1HV Monitoring & Indications 5712.16.233kV Monitoring & Indications 5812.16.3General 5812.16.4Monitoring & Control 58


12.16.5Panel Labeling 6012.16.6Wind Farm Trip/Alarm Supervision 6012.16.7 SCADA/RTU Remote Monitoring & Control System 6012.16.8Environmental Temperature Monitoring and Alarm System 60

12.17. Auxiliary Power System & Lighting 6012.17.1A.C. Supply General Information 6112.17.2A.C. Distribution Panels 6112.17.3Manual Change-Over Function and External LV Standby Power Connection Point 6312.17.4Auto Change-Over Function Between Normal LV Power Supplies 6412.17.5Grid Transformer LV Supply 6412.17.6 Substation Lighting 64

12.17.6.1 Outdoor Lighting ............................................................................. 6412.17.6.2 Indoor Lighting ............................................................................... 6412.17.6.3 Emergency Lighting.......................................................................... 65

12.18. D.C. System 6512.18.1General 6512.18.2D.C. System Monitoring 6512.18.3Batteries 6612.18.4Charging Rectifier 6712.18.5Battery Panel, DC Panel 6712.18.6DC/DC Converters 67

12.19. Secondary Wiring 68

12.20. Equipment Signs, General Signs, Markings & Labeling 68

12.21. Substation Earthing 6912.21.1Earthing, Earth Cables and Lightning Protection 69

12.21.1.1 Sidensjö North Minimum Substation Earth Grid ......................................... 7112.21.1.2 Sidensjö South Minimum Substation Earth Grid ......................................... 72

12.21.2Wind Farm Substation Sizes and Earthing Interfaces 7212.21.3Additional Terminations Required on Substation Earth Bar 7312.21.4Earthing Connection from the Overhead Line 7312.21.5Foundations for Under-Tension Overhead Line Terminal Structure 7412.21.6Panels for Storage of Maintenance Equipment for the Overhead Line 74

12.22. Cables, Terminations and Accessories 7412.22.1General 7412.22.233kV Cables 7512.22.3Power Cables for Auxiliary Power 7612.22.4 Signal and Control Cables 7612.22.5Cable Laying 76

12.22.5.1 Laying of Signal and Control Cables....................................................... 7612.22.5.2 Laying of Electronics Cables ............................................................... 7712.22.5.3 Laying of Optical Cables .................................................................... 7712.22.5.4 Cable Pits and Cable Ducts................................................................. 7712.22.5.5 Cable Ducts ................................................................................... 7712.22.5.6 Cable Pits ..................................................................................... 78

12.23. Inspection & Testing 7812.23.1General 7812.23.2Factory Tests 7912.23.3Witness Tests 7912.23.4Approval & Certification of Design Works 7912.23.5Tests on Completion 7912.23.6General 79

12.23.6.1 Recording of Data............................................................................ 8012.23.6.2 Site Testing & Commissioning.............................................................. 80

12.24. Summary of installation Works 83


12.24.1HV Works 8312.24.2Grid Transformer Works 8412.24.333kV Works 8412.24.4LV and Auxiliary System Works 85

12.25. Miscellaneous Works for Both Substations 85

12.26. Summary of the Miscellaneous Works for Moliden Grid Substation 86

12.27. Contract Spares per Substation 87

13. ANNEX 5 – TECHNICAL SPECIFICATION - CIVIL ....................................................... 88

13.1. General 88

13.2. Site Works 8913.2.1 Setting Out 8913.2.2 Excavation and Backfill 8913.2.3 Substation Hardstanding 8913.2.4 Drainage 9013.2.5 Earthing Wires in Ground 9113.2.6 Cable Trenches 9113.2.7 Cable Pipes/Ducts 9213.2.8 Cross Sections of Underground Cable Trenches 9313.2.9 Fencing 9313.2.10Foundations 9313.2.11Concrete Works 9313.2.12Foundations for Steel Structures and Stay Anchors 9413.2.13Foundations in Soil 9413.2.14Grid and Earthing Transformer Foundations (Transformer Oil Pits) 9413.2.15HV Equipment Foundations 95

13.3. Buildings 9513.3.1 General 9513.3.2 Particular Turbine SCADA Room Requirements 9713.3.3 Particular Switchgear room Requirements 9713.3.4 Building Permit and Announcements 97

13.4. Building Structure 9713.4.1 Basement Foundation 9713.4.2 External Walls 9813.4.3 Roof 9813.4.4 Floors 9813.4.5 Interior Walls and Ceiling 9913.4.6 Doors 9913.4.7 Keys 10013.4.8 Windows 10013.4.9 Decompression Flaps 10013.4.10Thermal Insulation 10013.4.11Heating & Ventilation 10113.4.12Water Supply & Sewerage 10113.4.13Fire Protection 10213.4.14Fire protection Documentation 10213.4.15 Interior Fittings 10213.4.16Documentation & Drawings 103

13.5. Fire Detection System 10413.5.1 General 10413.5.2 Design 10413.5.3 Central Control Panel/Apparatus 10513.5.4 Detectors and Alarm Buttons 10513.5.5 Alarm Signal Devices 105


14. ANNEX 6 – TECHNICAL SPECIFICATION - STEELWORKS............................................106

14.1. General 106

14.2. General Design Criteria 106

14.3. Loads 10614.3.1 Load Cases and Load Combinations 10614.3.2 Wind and Ice Load 106

14.4. Material, design and fabrication 10614.4.1 Structural Steel 10614.4.2 Galvanizing 10614.4.3 Structural Aluminium 10614.4.4 Bolted Connections 10714.4.5 Lattice Structures 107

15. ANNEX 7 – EXTRACT FROM EPC SIDENSJÖ ELECTRICAL SPECIFICATION, APPENDIX A, ECM 01986-007083. .....................................................................................................108

15.1. GRID TRANSFORMER 10815.1.1 General Ratings 10815.1.2 Ratings for 145kV 10815.1.3 Ratings for 33kV 10815.1.4 Ratings for Low Voltage Winding and Equipment 10915.1.5 Transformer Monitoring 10915.1.6 Automatic On-Load Tap-Changer (OLTC) Control System 10915.1.7 Terminal Equipment and Features: 110

15.2. HV DISCONNECTING CIRCUIT BREAKER 111

15.3. MV SWITCHGEAR PANEL 112

15.4. PROTECTION AND CONTROL 113

15.5. 33kV EARTHING TRANSFORMER 114

15.6. 33kV REACTOR 114

15.7. MV CABLE 115

15.8. FIBRE OPTIC CABLE 115

15.9. SCADA & COMMUNICATIONS SYSTEMS 116


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1. INTRODUCTION

This specification provides a high level technical specification of the electrical and civil requirements for the 2 off independent Sidensjö 130/33 kV wind farm substations, these being Sidensjö North and Sidensjö South. The substation SCADA technical requirements is not included in this specification but is referenced where applicable throughout this document to provide interface information with the electrical systems.

This high level technical specification provides indicative equipment ratings and functional operational requirements. The Contractor shall be responsible for all final ratings and specification of equipment and development of the functional requirements into a fully integrated electrical, civil and SCADA system for the wind farm substation.

The supply of the grid transformers are an integral part of each of the separate Substation Contract Works. The Contractor shall therefore be required to make full provision for thesupply, installation and connection as outlined in this specification and the grid transformer specification 01986-010214.

Project design requirements, scope of works and interfaces are contained in the main sections of this specification. All specific technical and functional requirements are provided within the following annexes;

Annex 1 – Applicable Codes & Standards

Annex 2 – Grid Connection Technical Extract

Annex 3 – Electrical Studies, Calculations, Studies & Models

Annex 4 – Technical Specification – Electrical

Annex 5 – Technical Specification – Civil

Annex 6 – Technical Specification – Steelworks

Annex 7 – Extract from EPC Sidensjö Electrical Specification, Appendix A, ECM 01986-007083

In this specification, the terms “Employer”, “Contractor” have the meanings described in the Engineering, Procurement and Construction (EPC) Contract. This specification is to be read in conjunction with these documents.

2. DESIGN LIFE & DEFECT LIABILITY PERIOD

All equipment shall be new and fit for purpose, having a design life of and be free from any latent defects for at least 25 years. Any components having a design life of less than 25 yearsshall be identified in a list/schedule, at tender stage, stating the anticipated design life of each such component, replacement quantities required and the associated cost for supplying replacement components.

The Defect Liability period for the wind farm substations shall be in accordance with the details in the Engineering, Procurement and Construction (EPC) Contract.


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3. DESIGN RESPONSIBILITY

The Contractor shall provide a design that achieves the performance laid out in this specification. The design shall be presented to the Employer for review and comment prior to manufacture.

No equipment shall be made or purchased without relevant specifications, drawings and calculations being presented to the Employer for review and comment.

4. APPLICABLE CODES & STANDARDS

All materials and equipment supplied for this Contract shall be new as manufactured to current applicable specifications. Under no circumstances will second hand, refurbished or obsolescent materials, plant or equipment be used.

In all cases, equipment shall be selected upon the basis of proven designs, and the Contractor shall identify any equipment or major component of equipment with a past history of use of less than 3 years in a similar application to that specified in this document.

The Works as applicable shall be carried out in accordance with good industry practice, i.e. those standards, practices, methods and procedures conforming to safety and legal requirements which are attained by exercising that degree of skill, diligence, prudence and foresight which would reasonably and ordinarily be expected from a skilled and experienced operator engaged in the same type of undertaking under the same or similar circumstances.

The Contractor shall ensure that all materials, equipment and plant, whether covered or not by specification, standard or code of practice conform to sound industry practice. Any item not covered shall be subject to the written approval of the Employer and/or his representative.

All materials, equipment and installation practices used in this contract shall, unless otherwise specified, be in accordance with the latest revisions of all applicable specifications, regulations and standards including but not limited to those listed in Annex 1.

5. ELECTRICAL DESIGN CRITERIA

The high level technical specification for the substation electrical contract works has been developed based upon the design criteria provided in this section. The Contractor shall be responsible for the review of this design criteria and determination of the final design criteria that shall be applied throughout the substation electrical contract works. The Contractors design criteria shall be agreed with the Employer prior to equipment procurement.

1. System Voltage 130 kV

2. Normal Operating Voltage (Un) 145 kV

3. Minimum Operating Voltage 130 kV

4. Maximum Operating Voltage 160 kV

5. Design Voltage (Um) 170 kV

6. Grid Design Fault Level (3-phase) 31.5 kA

7. Grid Design Fault Level (1-phase) 25 kA

8. Wind Farm Collection System Design Fault Level 25 kA


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6. ENVIRONMENTAL CONDITIONS

All equipment supplied shall be suitably designed for installation and operation, throughout its design life, based on the following prevailing environmental conditions. Responsibility for ensuring that the finally agreed specification is sufficiently adequate to meet these environmental conditions shall be the Contractor’s.

6.1 Outdoor Environmental Conditions

a) Altitude Less than 1000 metres above sea level

b) Maximum Temperature +32.2ºC

c) Minimum Temperature -50ºC

d) Humidity 10%min/100%max

e) Max Wind Speed 51.5 m/s (3 second gust)

f) Precipitation Precipitation of all kinds to be expected

g) Seismic Hazard (as per G.S.H.A.P.) No information available

h) Lightning Rate (as per SMHI: 1988 to 1999)

0.1 flashes per km2 per year

i) Snow Level Up to 1m of snow

6.2 Indoor Environmental Conditions

The following refers to the environmental conditions inside the wind farm substation or control building that shall be maintained under all outdoor environmental conditions.

a) Normal Ambient Temperature Range 10ºC to 27ºC

b) Humidity 50% Nominal


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7. SCOPE OF WORKS

The Contractor shall be responsible for the design, supply, delivery, installation, construction, testing, commissioning and energisation of the complete Sidensjö Wind Farm Substation Contract Works. Testing shall include Employer and Grid Operator witness testing.

In addition the Contractor shall be responsible for the design, supply, delivery, installation, construction, testing, commissioning and energisation of a limited scope of works at the Moliden Grid substation as defined in this specification and the associated NV SCADA specifications as detail within this specification.

Throughout this document the voltage designation of ‘HV’ is referenced as 130kV in line with the Grid system title, however the operating voltage is approximately Un = 145kV and so all ‘HV’ equipment shall be design for a maximum continuous voltage rating of Um = 170kV.

7.1 Scope of Works for Sidensjö Wind Farm

NoteThe following specification covers the scope for provision of both the Sidensjö North and Sidensjö South substations, even if this is not expressly differentiated in these specifications.

This shall include, but not be limited to HV switchgear, Grid Transformers, 33kV switchgear, 33kV Earthing Transformers, 33kV Reactors, protection and control equipment, LV switchgear, battery charger systems, including provision of all documentation, relays settings, test certificates, drawings and all auxiliary systems required to produce a fully functional substation.

The Contractor shall undertake sufficient planning to meet any requirements for the operation, maintenance and de-commissioning of the Substations through the 25 year design life. Each Substation Contract Works shall comprise, but not be limited to, the following:-

1. The connection of the individual Substation Works to the 130kV grid in accordance with the Grid Connection Technical Extract provided in Annex 2 and this technical specification via the overhead lines supplied under a separate contract.

2. Electrical system design studies, calculations and models as defined in Annex 3 and the provision of documentation in accordance with Contract Agreement Appendix 2 Administrative Rules.

3. Protection system design report and relay settings for complete project scope.

4. Earthing system design including a design report, calculations, safety criteria and hot zone contours, based on both (i) the stand-alone design of the substation earth grid and (ii) when the substation earth grid is fully interconnected into the wind farm-wide earthing system. The Contractor shall be responsible to provide recommendation of all mitigation measures required resultant from the hot zones.

5. Design, supply, delivery, installation, construction, testing, commissioning and energisation of the following plant and equipment as detailed in Annex 4;

(a) HV Switchgear bays (all HV equipment to be 170kV rated)

(b) Grid Transformers

(c) 33kV Switchgear panels and arc venting duct work (Note:- this does not include remote kiosk MVK1)


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(d) Earthing & Auxiliary Transformers

(e) 33kV Reactors and switching units

(f) Substation Surge arrestors

(g) Battery Systems & Chargers

(h) Protection, Monitoring & Control, Power Quality Metering, Check Tariff Metering Equipment

(i) Sub-station Earthing & Lightning protection systems

(j) SCADA/RTU Panel/s

(k) Operating Alarms, Fire Alarm & Intruder Alarm and Detection Systems

(l) LV auxiliary power system within the Sub-stations and compound area for heating, lighting (indoor, outdoor and emergency), air conditioning and all sub-station LV power requirements including SCADA and telecommunicationsand domestic type equipment

(m) LV cabling from Auxiliary winding of the Grid/Neutral Earthing Auxiliary transformer to the sub-station distribution board and all equipment earthing

6. Specification and supply of all surge arrestors required throughout the wind farm collection system as defined by the Contractors electrical system design studies.

The Contractor shall supply and install all the 33kV Surge Arrestors for installation in the substation and free issue surge arrestors to others for installation in the WF cable array. As a minimum the 33kV Surge Arrestors shall be specified and supplied by the Contractor for installation at locations (substation and turbines) as shown on SidensjöSingle Line Diagram 01986D4304, if additional units are required the Contractor shall supply these additional units.

The Contractor shall supply the 130kV side surge arrestors required on the transformer bushings and the 130kV switchgear (overhead line side). Only with prior written consent from the Employer may the substation compound mounted 130kV overhead line side surge arrestors be removed.

NoteThe 130kV surge arresters required at Sidensjö South substation, to be located either side of the 130kV underground cable section, shall be supplied and installed by the OHL Contractor.

7. Installation, test & commissioning of cabling from the 33kV CT’s and VT’s, located in the 33KV substation panels, to the metering cubicle located within the substation building.

8. Substation inter-plant 33kV cabling including, but not limited to;

At Sidensjö North

a) Circuit breaker MVCB06 to Earthing and Auxiliary transformerb) Circuit breaker MVCB01 to Grid transformerc) Circuit breaker MVCB05 to the RPC reactor unit

At Sidensjö South Side 1 of 33kV board


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d) Circuit breaker MVCB12 to Earthing and Auxiliary transformere) Circuit breaker MVCB11 to Grid transformerf) Circuit breaker MVCB13 to the RPC reactor unit

At Sidensjö South Side 2 of MV board

g) Circuit breaker MVCB27 to Earthing and Auxiliary transformerh) Circuit breaker MVCB21 to Grid transformeri) Circuit breaker MVCB26 to the RPC reactor unit

9. The Contractor shall supply and install insulated cable ducting to a minimum distance of 3m external to the substation buried perimeter earth grid electrode. These ducts shall be used for installation for all incoming cables from electrical infrastructure and over head lines.

The Contractor will supply and install a set of longer 3x 150mm diameter ducts for Sidensjö South, which run from the busbar cable sealing located within the substation compound, to the cable sealing end to be located at the OHL terminations pole in accordance with indicative drawing 01986D4003. 130kV and 33KV cable termination supply, fitting and connection shall be carried out by the Overhead Line and Cable Infrastructure Contractors for the cables they supply. The Contractor shall include provision of cable pulling pit local to the overhead line cable sealing ends. See drawing 01986D4003

10. Substation external incoming/outgoing signalling cables, as defined in the relevant sections of this specification, shall be terminated by others to termination points provided by the Contractor within the substation.

11. Design, supply, deliver, off-load and install, test and commission of the required fibre optic cable patch panels and ducting within the substation. The turbine array fibre optic collection system shall be routed into the substation and terminated by the Cable Infrastructure Contractor into a wall mounted fibre optic patch panel at an agreed location within the substation. The Contractor shall supply jumpers between this patch panel and all substation ducting and routing

12. Connection of the sub-station to the telecommunications system, including aerials/ GPS satellite dish, if required and associated earthing requirements.

13. All SCADA and signal list requirements, fibre optic and telecommunication specifications are covered by separate specifications and documents. These are listed with the unique reference number in the appropriate section of this specification.

14. Design, manufacturing, supply and installation of all sub-station civil works, building construction and steelwork as detailed in this specification.

15. The Contract works shall include for the sufficient electrical ducting/canalisation into the substations from external Contract works performed by others connecting into the substations as defined by the minimum requirements of this specification plus 25%. Also civil works such as entrance roads from the wind farm road to the substation entrance including the routes within the substation boundary.

16. The Grid transformers shall be supplied, off-loaded and installed at the required location by the transformer supplier or his appointed representative. The Grid transformer manufacturing contractor shall then fit all fittings shipped separately to the transformers but which form an integral part of its scope e.g. radiators, and fill with oil. The Contractor shall complete all required HV, 33kV and LV connections and


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then commission and put the transformer in service.

The Contractor shall supply an Automatic Voltage Control (AVC) panel for installation in the substation as part of the On Load Tap Changer control function for the Grid Transformer. The Contractor shall co-ordinate with the Grid transformer supplier to ensure a fully functional system is delivered. The contractor will supply and install all cabling required between the Transformer and the AVC control panel to realise a fully functional scheme and required VTs and CTs. Commissioning and putting the scheme into service shall be the Contractors responsibility.

The Contractor shall install a suitable CT in the Incoming Grid connection CB’s (MVCB11, MVCB21 and MVCB01) for interfacing to the AVC relay to allow for a load drop scheme to be implemented for each Grid transformer at a later date if required. The Contractor shall have this CT installed in the switchgear and its terminals shorted out in the switchgears LV terminal box ready for future use.

17. Provision of space for one additional 33KV circuit breaker to be added to the 33kV switchboard in Sidensjö North and two off additional circuits breakers to the 33kV switchboard in Sidensjö South. Ducting for these extra CBs shall be pre-installed ready for future use.

18. This item is no longer applicable

19. At Sidensjö North the Contractor shall allow for the supply and installation of 3 off 110mm ducts suitable for 33kV cables to run from the 33kV room trench to a point 10m external to the substation building for future use/spare should an additional CB be required (these are in addition to the ducts installed ready for harmonic filter installation).

At Sidensjö South the Contractor shall allow for the supply and installation of 2 off lots of 3 off 110mm ducts suitable for 33kV cables to run from the 33kV room trench to a point 10m external to the substation building for future use/spare should additional CBs be required at either end of the 33kV board (these are in addition to the ducts installed ready for harmonic filter installation).

Ducts shall be run to an agreed location area at site with Employer staff and to be clearly labelled for future use and supplied with draw cords and temporarily sealed accordingly.

20. Testing and setting to work of Grid Company supplied and installed line protection panel(s) to be located in a room provided in the Grid company’s 130kV substation at Moliden. The contractor shall correspond and co-ordinate with the Grid Company to ensure the scheme and arrangement complies with their standards and requirementsof this specification.

21. Installation, testing and setting to work of Grid Company supplied and installed line protection panel(s) to be located in the Sidensjö North Control room for protection of the new UT171 Moliden to Sidensjö North 130kV overhead line.

The Contractor shall supply, install, terminate, test and commission all necessary CT, VT, DC, auxiliary power and communication fibre optic cable connections as may be required to achieve full operation.

The contractor shall correspond and co-ordinate with the Grid Company to ensure the scheme and arrangement complies with their standards and requirements.

22. The Supply, test, commissioning and setting to work of the one Tariff metering panelat Moliden shall be by the Grid Company.


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Supply, install, test, commissioning and setting to work of the Wind Farm ‘Check Tariff’ and ‘Power Quality’ metering devices, along with communications equipment, all assembled into a single common metering panel, to be located in a room provided in the Grid company’s 130kV substation at Moliden shall be part of the Contractors scope of work. Supply, installation and termination of all cables up to and on to the terminal rails inside this panel shall be undertaken by the Grid company, under the instruction and supervision of the Contractor.

See project SCADA & Communications Block Cable Diagram 01986D4501 and SLD 01986D4304. Grid Company will provide the required CTs and VTs and associated LV cabling up to this panel, for the Grid company to terminate into this panel.

In the initial arrangement the ‘Check Tariff’ meter and ‘Power Quality’ meter CT connections shall be connected in series, sharing a common set of CT’s provided by the Grid company.

The Grid Company dual busbar connection arrangement will require a single feeder connected metering CT configuration.

23. Design and provision of foundations upon which the overhead line contractor can install the 2 off terminal structures at the North substation. Contractor to liaise with OHL Contractor to obtain loading information for the foundation design.

24. Provision of the minimum contract spares as detailed in this specifications section titled:- Contract Spares per substation.

NoteThe Contractor shall also ensure full compliance with the technical requirements as stated in the separate NV Specification – EPC Sidensjö Electrical Specification, Appendix A, ECM 01986-007083. The relevant sections of this high level EPC Specification document that are applicable to this substation specification have been extracted and reproduced in Annex 7 of this specification. This document defines the overall project scope to the end client as agreed by the Employer and will therefore encompass this specification and its scope of supply and interface requirements. Therefore the Contractor shall ensure they review that separate specification for compliance of his contract works and raise any areas of concern or non-compliance with the Employer for clarification/agreement.

7.2 Indicative Use Only Drawings

During the overall Sidensjö Wind Farm project development NV have developed a number of drawings. These drawings have only been used to provide indicative assessments of the land area required for the Sidensjö North and Sidensjö South substations and the overhead lines to and between these substations the 33kV cable array access to the substations etc. In addition they have been used to allow for the outline design of the required earthing grid at each substation.

These drawings have therefore been provided for completeness only as part of this specification to help the Contractor to understand the overall requirements to be provided for at the Sidensjö North and Sidensjö South substations.

These drawing must not therefore be directly copied and used by the Contractor to arrange his substations as multiple items of equipment may not be on these drawings as they were not required for planning etc. Therefore the contractual requirement to develop his onsite HV compound orientation and arrangements and his substation building and internal arrangements shall remain with the Contractor whom shall not use this for information drawings as the basis of his design


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The Contractor must not increase on the sizes used in these indicative drawings as these have planning restrictions on them. If any of the building sizes has to increase over the Indicative sizes then the Contractor shall bear the costs of reapplication of planning submissions and encumbering delays to accommodate his equipment and or arrangements

01986D2233 – Sidensjö Wind Farm Sub-Station Indicative Room Layout sheet 1 of 2 South Substationsheet 2 of 2 North Substation

01986D4003 - Sidensjö Wind Farmsheet 1 of 2 Substation Layout – South Substationsheet 2 of 2 Substation Layout – North Substation

01986D4005 - Sidensjö Wind Farmsheet 1 of 2 Substation Earth Grid – South Substationsheet 2 of 2 Substation Earth Grid – North Substation

Additionally the following drawings are being made available as part of the project development. However the Contractor must consider the very indicative only nature of these drawings and should not be influenced by them to the detriment of his designs and arrangements

Development (Indicative) drawings01986D2528 – Sidensjö Windfarm - Substation Location01986D2223 – Sidensjö Windfarm - Substation Layout

Indicative Only Electrical drawings01986D4002 – Control Building Electrical Equipment Layout01986D4004 – Substation LV Distribution Diagram

Other Electrical drawings01986D4101 – Grid Connection Single Line Diagram


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8. INTERFACES

8.1. Design Coordination

The Contractor will provide to the Employer all design information he may reasonably require to comply with the Connection Offer and Connection Agreement and any other information reasonably requested by the Grid Company.

The Employer will obtain from the Grid Company any design information the Contractor may reasonably require to complete the design.

The Contractor will ensure that the electrical design and the protection settings of the Wind Farm Electrical System are coordinated with the electrical design and the protection settings and short circuit currents of the Grid Company and of the wind turbines. The design and engineering, delivery, installation, commissioning and tests of the Grid Connection works will fall under the Grid Company’s responsibility.

The Contractor will cooperate with the Overhead Line Contractor appointed by the Employer to facilitate design and build the grid interconnecting 130kV (170kV) overhead line.

The Contractor will cooperate with the Windfarm Cable Infrastructure Contractor appointed by the Employer to facilitate design and build the windfarm collection system.

The Contractor will cooperate with the meter operator appointed by the Employer to facilitate the meter operator’s installation of metering equipment in the wind farm substation.

The Contractor will coordinate the SCADA/HMI/Fibre Optic systems between the Grid Company, Turbine Supplier, and the project ownership companies Sidensjö Elnät AB (SidEAB) and Sidensjö Vindkraft AB (SVAB). Project ownership boundaries between SidEAB and SVAB can be identified on single line drawing: SLD 01986D4304.

8.2. HV Interfaces

The two HV interfaces at Sidensjö North substation shall take place within the substation compound at the connection points where the slack span aerial jumpers, dropping down from the two 130kV overhead under-tension terminal structures, meets with the substation 130kV busbar system. The Overhead Line Contractor shall supply and terminate these slack span jumpers onto suitable busbar terminals provided as part of the substation scope of supply. The Contractor shall interface directly with the Overhead Line Contractor to co-ordinate this termination work. See drawing 01986D4003.

At the Sidensjö South substation the Overhead Line Contractor shall install a short section of 2 off in parallel connected underground 170kV cables (approximately 50m long) between his last overhead line pole and the Contractor’s supplied and installed cable sealing ends that shall connect to the substation busbar system via a disconnector switch. See drawing 01986D4003.

The Substation Contractor shall co-ordinate with the Overhead Line Contractor to provide an approximately 6m wide corridor from the HV substation out to the OHL termination pole for the installation of the HV cable, any bends in this route must be at an agreed minimum radius. In addition to the 2 off parallel HV cables there shall be 3 off earth cables and 1 off Fibre optic cables to be brought into the substation. The Substation Contractor shall therefore co-ordinate with the Overhead Line Contractor to supply and install all of these insulated ducts out to OHL termination pole for all the HV, earthing and Fibre optic cables. See drawing 01986D4003.


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The Substation Contractor shall ensure the correct phase rotation is observed at both Sidensjö North and at Sidensjö South and carry this through into the Wind Farm to ensure any co-ordination of protection systems with the Overhead Line Contractor and the Grid Company shall function correctly.

The size and rating of the interface equipment within the wind farm sub-station shall be specified by the Contractor based on the continuous rating of the wind farm and the system fault levels and all calculations shall be submitted to The Employer for comment.

The Contractor shall ensure all electrical and civil interfaces with the Grid Transformer are compatible with the substation 130kV equipment and 33kV and LV cable connections, together with foundation/bunding and installation offloading/lifting requirements.

The Contractor shall ensure all protection, control and monitoring interfaces with the Grid Transformers are compatible/interface with the Grid Transformer control panels and the protection relay panels to be designed and supplied by the Substation Contractor at both substations.

The Substation Contractor shall attend regular monthly design meetings between The Employer and the overhead line contractor and the Grid Company including the provision of applicable technical information required to progress management of all required interfaces.

8.2.1 Switching Responsibility

The Contractor shall take due cognisance of the Switching responsibilities as outlined in NV drawing 01986D4310 – Switching Responsibility Diagram. These shall be in place from the start of the project until the Contractor signs over the 2 off substations to the Employer and the Employer has accepted these substations

8.3. 33kV Interfaces

8.3.1 33kV Interface at Both Substations

The point of interface for the 33kV system shall be at each of the Substations 33kV switchgear terminals for the outgoing 33kV underground cables to the wind farm arrays.

The associated single core aluminium 33kV underground cables & cable terminations shall besupplied and terminated by the wind farm Cable Infrastructure Contractor under a separate contract. The Contractor shall provide and install a suitable type and quantity of cable conduits for each cable to a point located 3m outside the substations outer buried earthing system conductor. If the 33kV cables are to be installed in single phase conduits, the conduits must be made from a suitable non-magnetic material. The cable risers shall be required to facilitate termination of the 33kV cables. The Contractor shall be responsible for sizing the conduits/ducts and the required bending radius to be used to ensure that the required 33kV cables shall be easily installed within the substation ducts without damaging the incoming array cables.

For each 33kV cable circuit brought into the substation in dedicated ducts, the Contractor shall additionally supply 4 off plastic conduits to follow the same route. Two (2) shall be used to accommodate pre-ducted fibre optic cable(s) and shall be sized at 110mm inside diameter with a bending radius of not less than 1200mm. One shall be designated for the bare ground wire conduit and shall be sized at 100mm inside diameter with a bending radius of not less than 1000mm. The final duct shall be designated as a spare and shall be sized at 110mm inside diameter with a bending radius of not less than 1200mm.


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All additional conduits shall exit the substation, parallel and adjacent to the associated 33kV cable circuit conduit, and shall extend to a point located 3m outside the substation boundary/outer buried earthing system. The fibre optic conduit associated with the wind turbines shall be routed to a point within the substation Control Room to align with a wall-mounted fibre optic patch panel. At Sidensjö North substation, the fibre optic patch panel is to be located on a wall near to the SCADA Room. The fibre optic patch panel shall be positioned no more than 1m above ground floor level. The bare ground wire conduit shall be routed to the main substation grounding bar.

All cable conduits shall have a smooth internal surface and be fitted with a draw rope, to allow for ease of cable insertion. All conduits must be free of any obstruction. All ducts to be sealed post installation.

The MV Cable layout 01986D4303 shows the overall Sidensjö Wind Farm development and the directions from which the HV overhead lines/cables and the 33kV cables shall approach the substations. It shall remain the Contractors responsibility to develop in detail the substation arrangements to accommodate the incoming and outgoing HV, 33kV, LV, earthing and Fibre optic communications cables etc.

8.3.2 33kV Interface with the MVK1 Metering and Isolation Kiosk

The point of interface for the substation 33kV system shall be at the Sidensjö South substation 33kV switchgear terminals for the incoming 33kV underground cables. The supply of the 33kV cable out to the metering kiosk MVK1 and the supply of the kiosk shall be by the Cable Infrastructure Contractor. Additionally the underground fibre optic cable containing the metering information shall be terminated in the fibre optic patch panel supplied and installed by the Contractor and the signals split out for sending to the tariff metering system.

The Contractor shall allow for 33kV CB interlocking with this MVK1 kiosk by MVCB22 as outlined in section – Specific Turbine Interlocking Requirements – of this specification.

8.4. Substation LV Power Supply Interface

The primary source of LV power for the Sidensjö South wind farm substations shall be the LV terminals of each of the two off Grid Transformer Auxiliary 420V windings.

The primary source of LV power for the Sidensjö North wind farm substation shall be the LV terminals of the Grid Transformer Auxiliary 420V winding and the LV terminals of the Auxiliary and Earthing transformer

In addition to the primary LV power supply for each of the substation buildings, provision for cabling is also to be made for connection of a temporary LV supply which shall be sourced from a mobile diesel generator. This shall be brought to site for use within the substation as a temporary /emergency supply when required e.g. HV Grid outage.

The outdoor termination box used as the connection point for the temporary diesel driven supply shall include a manual operated pad-lockable isolator and shall be rated at not less than 63Amps.

The Contractor is expected to use this connection during the construction phase. The Contractor shall therefore include the costs for provision of a temporary diesel generator during the commissioning phase.

The Contractor shall therefore make due provision for a dedicated location of the diesel generator package, its fuel tank and the connection of this mobile diesel generator at each


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substation. Location of this interface box to be agreed with the Employer, nominated location shall be on the tender drawings and initial site arrangement drawings.

The Contractor shall supply and fit an outdoor LV cable termination box for the generator to be cabled to, this box shall be complete with a lockable load break isolator and suitable terminals and a lockable door to prevent unauthorized access. The box shall be complete with cable access point for the generator cable that can be resealed after use and to allow the door of the box to be closed and locked.

The manual changeover scheme to switch primary LV supplies to this temporary supply at both substations must include for both electrical and mechanical interlocking.

This external box shall be complete with a blue lamp used to show mains power is available and energizing the substation.

The Contractor shall install an LV cable from the external termination box to the indoor manual change over switch and cable into the Main substation power distribution board (VHC) to complete the installation ready for the diesel generator connection. The manual change over switches shall be 4-poled and disconnect the neutral conductor after the phase conductors when switching off and before the phase conductors when switching on. The LV supplies from either the main transformer or the diesel generator shall be as a TN-S system and the neutral star point shall be connected to earth in each supplying point.

8.5. Grid Company Remote Telemetry Unit (RTU) Signals Interface

For details of all monitoring and control SCADA interfaces from the substations to the Grid Company please refer to separate document 01986-008942 Sidensjö SCADA Signal List.

This preliminary interface signal listing will require updating and revising during the project as the Contractor develops the project and so the Contractor must make due regard of this requirement.

It is expected that the Grid Company shall supply and free issue to the Contractor, 1 off 800mm wide by 800mm deep panel at each Wind Farm substation. These signals may need to be hard wired from the Substation limited number of HV and 33kV switchgear panels into the Grid companies RTU’s at each substation. The Contractor shall include for this signal cabling and for connecting the Grid companies RTU’s to the fibre optic patch panels that form part of this scope of supply for signal transmission over the OPGW (Optical Fibre Composite Overhead Ground Wire). The fibre optical cable carried shall be a 48 fibred where each is a single mode fibre type.

8.6. Wind Farm Operator RTU Signals Interface

The wind farm operator will require monitoring of various electrical parameters separately from Grid companies RTU system, refer to separate document 01986-008942 Sidensjö SCADA Signal List which shall be revised during the projects development. The Contractor shall include for this signal cabling from the switchgear to the RTU.

8.7. Communications Interface

Where necessary all communication circuits should be suitably protected against high voltages, in accordance with the requirements of ITU CCITT Directives, IEEE 487-2007 and IEEE 367-2012.

Note:- The Contractor shall provide and install a suitable type and quantity of cable conduits (minimum of 110mm inside diameter and with bending radius of not less than 1200mm) from the control building to a point located 3m beyond the substation boundary/buried earthing system (whichever is the furthest out), to facilitate installation of external telephone line


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cable and/or fibre optic communications cable, which shall be provided by others to facilitate communications with the substation from the external national communications network and the overhead lines.

8.8. Substation Ground Works Interface

Each substation area shall be cleared of trees/vegetation by the Employer and the Contractor shall strip topsoil prior to the commencement of works at both the substation.

The Contractor shall then take ownership of the substation works and shall be responsible for ensuring that the design and installation of the Contract Works are suitable for the existing ground and environmental conditions.

8.9. Revenue Metering Locations

The overall Sidensjö wind farm project has been split into 2 separate ownership metering areas: Sidensjö Elnät AB (SidEAB) and Sidensjö Vindkraft AB (SVAB), as identified on single line drawing: SLD 01986D4304. Tariff meters shall be installed by the Contractor in line with thesesingle line diagrams.

Each substation shall be equipment with Tariff metering equipment to meter the power exported from or into the wind farm 33kV cable array out to the turbines.

In addition it must be noted that the Sidensjö South substation metering area extends out to the kiosk MVK1 located by T35 due to the very long length of this 33kV cable. Therefore the Contractor shall supply the substation tariff metering system and allow for an input from the tariff meter (supplied by the Cable Infrastructure Contractor) located in kiosk MVK1 to allow it to be integrated into the Sidensjö South substation metering. This tariff meter signal shall form part of the fibre optic cable signal routed to the substation from the turbines.

The metering equipment shall therefore be designed according to the requirements of IBH04/Metering and STEM FS 2007:5. The metering VT’s and CT’s are to be supplied, located and mounted in the 33kV switchgear by the Contractor.

The specification of the tariff metering may be provided by the Grid Owner or be to Swedish standards, this shall be confirmed at Contract stage.

The Contractor shall be responsible for design, installation, testing and documentation of all the metering equipment required to ensure correct functionality of the Tariff meters forming part of the substation scope.

The Tariff meters and any required communications equipment shall be supplied by the Contractor for installation in metering cubicles supplied by the Contractor at the WF substations and at the Grid interface substation at Moliden.

The Contractor shall then assist in the commissioning of the overall metering system.


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9. ANNEX 1 – APPLICABLE CODES & STANDARDS

The standards set out throughout this section should be regarded as defining the minimum required. The Contractor shall note that compliance with individual standards and codes of practice relating to the provision of the items and materials that make up any component of the works will not guarantee an integrated fit-for-purpose solution. Therefore, it is the responsibility of the Contractor to propose a solution that not only meets the basic requirements of the standards but is sufficient for the purpose for and the circumstances in which it is used.

If standards referred to have been revised, the ones in force at the ordering date shall be considered as valid. SS-EN documents are the ruling requirements, thereafter CENELEC (EN, HD or TS documents) and thereafter IEC or ISO.

For design of the plant the following publications are valid in their latest editions:

ELSÄK-FS 2008:1-3 Heavy current regulationsELSÄK-FS 2006:1 Heavy current regulationsSTEM FS 2007:5 Metering directivesIBH 04 Connection of customer plants 1-36kV to the gridESA 99 Electrical safety regulationsNS-I-25-1999 ESA changes and additionsAFS 1999:6 Pressure vesselAFS 2008:13 Warning markings and warning signalsAFS 1994:53 Single pressure vesselsSS ISO 724 ISO general-purpose metric screw threads - Basic dimensionsSS ISO 965-4 ISO general purpose metric screw threads – TolerancesSS-EN ISO 898 Mechanical properties of fasteners made of carbon steel and alloy

steelSS-EN ISO 1461 Hot dip galvanized coatings on fabricated iron and steel articles -

Specifications and test methodsSS-EN ISO 3506 Mechanical properties of corrosion-resistant stainless steel fastenersSS-EN ISO 4032 Hexagon nuts, style 1SS-EN ISO 4753 Fasteners - Ends of parts with external ISO metric screw threadSS-EN ISO 10684 Fasteners - Hot dip galvanized coatingsSS-EN ISO 12944-2 Paints and varnishes - Corrosion protection of steel structures by

protective paint systemsSS-EN ISO 14001 Environmental management systems - Requirements with guidance

for useSS-EN 10250-4 Open die steel forgings for general engineering purposes - Part 4:

Stainless steelsSS 817345 Doors and door-sets - Burglar resistance - Classification, requirements

and testSS 408 01 10 Rechargeable batteries - Erection and ventilationSS EN 61936-1 Power installations exceeding 1 kV ACSS 421 01 66 Mechanical design of outdoor substationsSS 421 01 67 Design of outdoor substations - Wind and Ice LoadsSS 424 14 05 Wiring systems for max 1000 V - Methods of calculation to safeguard

correct disconnection - Directly and not directly earthed systems protected by fuses

SS 424 14 07 Power cables - Behaviour under short-circuit conditionsSS 424 14 16 Power cables - XLPE-insulated cables of rated voltages 7/12 V to

21/36 kV - Specification for design and testingSS 424 14 24 Power cables - Choice of cables with rated voltage max 0.6/1 kV with

regard to current carrying capacity, protection against overload and protection at short circuit

SS 424 14 37 Underground installation of Cables


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SS 424 14 38 Cable management in buildingsSS 436 21 01 Electrical operating area for low-voltage switchgear and control gearSS 436 21 04 Emergency opening device on doors in locations for switchgear and

control gearSS 436 40 00 Low-voltage electrical installations - Rules for design and erection of

electrical installationsSS 436 46 61 Electrical installations of buildings - Part 6-61: Verification - Initial

verificationSS 436 46 61 T1 Electrical installations of buildings - Part 6-61: Verification - Initial

verification - Appendix and changesSS 487 01 10 Lightning protection of buildingsSS-EN 50052 Cast aluminium alloy enclosures for gas-filled high-voltage switchgear

and control gearSS-EN 50064 Wrought aluminium and aluminium alloy enclosures for gas-filled

high-voltage switchgear and control gearSS-EN 50068 Wrought steel enclosures for gas-filled high-voltage switchgear and

control gearSS-EN 50069 Welded composite enclosures of cast and wrought aluminium alloys

for gas-filled high-voltage switchgear and control gearSS-EN 50522 Earthing of power installations exceeding 1 kV a.c.SS-EN 60044-1 Instrument transformers - Part 1: Current transformersSS-EN 60044-2 Instrument transformers - Part 2: Inductive voltage transformersSS-EN 60068 Environmental testing - Part 2-82: Tests - Test TX: Whisker test

methods for electronic and electric componentsSS-EN 60099-4 Surge arresters - Part 4: Metal-oxide surge arresters without gaps for

A.C. systemsSS-EN 60137REV2 (2003)

Insulated bushings for alternating voltages above 1kV

SS-EN 60168 Tests on outdoor post insulators of ceramic material of glass for systems with nominal voltages greater than 1000 V

SS-EN 60204 Safety of Machinery – Electrical Equipment of machinesSS-EN 60439-1 Low-voltage switchgear and control gear assemblies - Part 1: Type-

tested and partially type-tested assembliesSS-EN 60255-1-27 Measuring relays and protection equipmentSS-EN 60289 ReactorsSS-EN 60694 Common specifications for high-voltage switchgear and control gear

standardsSS-EN 60721 Classification of environmental conditionsSS-EN 60865-1 Short-circuit currents - Calculation of effectsSS-EN 60870-2-1 Telecontrol equipment and systems - Part 2: Operating conditions -

Section 1: Power supply and electromagnetic compatibilitySS-EN 61082-1 Preparation of documents used in electrotechnology - Part 1: RulesSS-EN 61082-2 Preparation of documents used in electrotechnology - Part 2:

Function-oriented diagramsSS-EN 61082-3 Preparation of documents used in electro-technology - Part 3:

Connection diagrams, tables and listsSS-EN 61810-1 Electromechanical elementary relays - Part 1: General requirementsSS-EN 61810-2 Electro-mechanical elementary relays - Part 2: ReliabilitySS-EN 61811-10 Electro-mechanical elementary relays of assessed quality - Part 10:

Sectional specification - Relays for industrial applicationSS-EN 61951-1 Secondary cells and batteries containing alkaline or other non-acid

electrolytes - Portable sealed rechargeable single cells - Part 1: Nickel-cadmium

SS-EN 61000-4-3 Electro-magnetic compatibility (EMC) - Part 4: Testing and measurement - Section 3: Radiated, radio-frequency, electromagnetic field immunity test

SS-EN 61000-4-4 Electro-magnetic compatibility (EMC) - Part 4-4: Testing and measurement techniques - Electrical fast transient/burst immunity


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testSS-EN 62271-100 High-voltage switchgear and control gear - Part 100: Alternating-

current circuit-breakersSS-EN 62271-102 High-voltage switchgear and control gear - Part 102: High-voltage

alternating current disconnectors and earthing switchesSS-EN 62271-108 High-voltage switchgear and control gear - Part 108: High-voltage

alternating current disconnecting circuit-breakers for rated voltages of 72,5 kV and above

SS-EN 62271-200 High-voltage switchgear and control gear - Part 200: AC metal-enclosed switchgear and control gear for rated voltages above 1 kV and up to and including 52 kV

IEC 60376 Specification of technical grade sulphur hexaflouride (SF6) for use in electrical equipment

IEC 60502 Power cables with extruded insulation and their accessories for rated voltages from 1 kV (Um = 1,2 kV) up to 30 kV (Um = 36 kV)

IEC 60617 Graphical symbols for diagramsIEC 62027 Preparation of object lists, including parts listsIEC-TS 60815 Selection and dimensioning of high-voltage insulators intended for

use in polluted conditionsIEC 60834-1 Teleprotection equipment of power systems – Performance and

testing – Part 1: Command systemsIEC/EN 61346 Industrial systems, Installations and equipment and Industrial

Products - Structuring Principles and Reference DesignationsIEC/EN 61355 Classification and Designation of Documents for Plants, Systems and

EquipmentIEC 61462 Composite insulators – Hollow pressurized and unpressurized

insulators for use in electrical equipment with rated voltage greater than 1000 V

IEC 62217 Polymeric HV insulators for indoor and outdoor use - General definitions, test methods and acceptance criteria

IEC 62231 Composite station post insulators for substations with a.c. voltages greater than 1000 V up to 245 kV - Definitions, test methods and acceptance criteria

IEC 62023 Structuring of Technical Information and DocumentationIEC 61175 Industrial systems, installations and equipment and industrial

products - Designation of signalsIEC 61666 Industrial systems, installations and equipment and industrial

products - Identification of terminals within a systemAMA 2007 General material- and job specification

Construction AMA 07Building AMA 07Heating, Ventilation and Sanitary AMA 07Cooling AMA 07Electric AMA 07

BBR The National Board of Housing, Building and Planning – Boverket Collection of rules for construction, BKR, the law of construction of buildings and the building ordinance

BBK 04 The National Board of Housing, Building and Planning – Boverket handbook about concrete structures

BKR The National Board of Housing, Building and Planning – Boverket rules of constructions

ITU CCITT Directives concerning the protection of telecommunication lines against harmful effects from electric power and electrified railway lines

IEEE 80-2000 Guide for safety in AC Substation GroundingIEEE 81 Guide for Measuring earth resistivity, Ground Impedance and earth

Surface Potentials of a Ground SystemIEEE 367-2012 Recommended practice for determining the electric power station


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ground potential rise and induced voltage from a power faultIEEE 487-2007 Recommended practice for the protection of wire-line

communication facilities serving electric power locationsIEEE 998 Guide for Direct Lightning Stoke Shielding of Substations VAST-

Vattenfall Earthing of stations and switchgear – Design guidelines and methods for measurement, June 1987

EBR KJ 60:04 Fence for electric power plantsEBR Electrical construction guide for plants 0.4-145kVEBR U304L Actions for concrete bedK905 Trygg Hansa, Safety regulations for easily set on fire constructions

dated 91 12 01SEK 438 High-voltage handbookSBF 110:7 The Swedish Fire prevention association’s rules for fire alarmsSSF 130:7 Swedish Fire & Safety Certification rules for burglar alarmSSF 200:4 Mechanical burglary protectionSSF 1015 Construction Company for burglar alarm constructionSNV RR 1978:5 Swedish Environmental Protection Agency, External industrial noise –

common adviceIEC 60071-2 Insulation co-ordination Part 2: Application guideIEC 60228 Conductors of insulated cablesIEC 60229 Electric cables - Tests on extruded oversheaths with a special

protective functionIEC 60230 Impulse tests on cables and their accessoriesIEC 60270 High-voltage test techniques - Partial discharge measurementsIEC 60287 Electric cables - Calculation of the current ratingSS 4241417 Power cables - XLPE-insulated cables and their accessories for rated

voltages 30/52 kV to 98/170 kV - Specifications for testingISO 31 Reference materials -- Contents of certificates and labelsISO 80000 Quantities and unitsEN ISO 9001 Quality systems – Model for quality assurance in design/development,

production, installation and servicingCENELEC HD 629.1 Test requirements on accessories for use on power cables of rated

voltage from 3,6/6(7,2) kV up to 20,8/36(42) kV - Part 1: Cables with extruded insulation

SvK TR1-01 KraftanläggningarSvKFS 2005:2 Affärsverket Svenska Kraftnäts och allmänna råd om

driftsäkerhetsteknisk utformning av produktionsanläggningarASP Anslutning av större produktionsanläggningar till Elnätet (Elforsk

rapportnummer 06:79AMP Anslutning av mindre produktionsanläggningar till elnätet

It should be noted that IEE 998 is a guide to the provision of lightning protection of substations and forms THE EMPLOYER standard guide to use when reviewing the substation design, however the Contractor should refer to SS-EN 61936-1, SS-EN 50522 and the IEC requirements (e.g. IEC 62305-2, 2006 for the Protection against lighting) laid out in that Swedish Standard for the provision of lighting protection measures provided these Swedish standards and IEC standards are fully documented.


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10. ANNEX 2 – GRID CONNECTION TECHNICAL EXTRACT

The Contractor shall be responsible for the technical performance requirements within the substation as defined in the Sidensjö Grid Technical Extract documents, which comprises the following:

1. Technical Extract from Sidensjö Grid Connection Offer. NV reference ECM 01986-011472

2. Technical Extract from Sidensjö Grid Connection Agreement. NV reference ECM 01986-011470

3. Grid Interface Technical Information. NV reference ECM 01986-011483

4. Single Line diagram, UT171 Moliden SLD showing connection to Sidensjö NL7 S3 by Vattenfall. NV reference ECM 01986-010447

5. Aerial photo of UT171 Moliden substation, with NL7 S3 Sidensjö 130kV Circuit Breaker bay marked up. NV reference ECM 01986-010446

6. Technical Requirements for Customer Facility. NV reference ECM 01986-007869

7. CB data sheet for ABB unit to be installed by Vattenfall at Moliden NV reference ECM01986-010448

8. Substation plan Moliden Transf-station 1 – 659965. NV reference ECM 01986-010506

9. Moliden Transf-station 130kV Busbar Plan View – 1-1060061. NV reference ECM 01986-010449

10. Moliden Transf-station 130kV Busbar Typical Section View – 1-659 978. NV reference ECM 01986-010450

11. Moliden Earth Grid drawing – 1-659966. NV reference ECM 01986-012423

12. Moliden Control Housing Basement drawing – proposed Protection Panel placement – 1-1012981. NV reference ECM 01986-012902

13. Moliden Control Housing Floor drawing – proposed Metering Panel placement – 1-1012982. NV reference ECM 01986-012903


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11. ANNEX 3 - ELECTRICAL SYSTEM DESIGN CALCULATIONS & STUDIES

11.1. Electrical Calculations, Studies and Models

The Contractor shall be responsible for all electrical system design calculations and studies deemed necessary by the Employer for the Substation Contract Works.

The Contractors electrical system design responsibility shall extend into the wind farm electrical infrastructure and the overhead line for protection design, earthing design, harmonic analysis and insulation co-ordination.

The electrical system design works shall include, but not be limited to the following.

Fault calculations covering all HV, 33kV, LV and DC systems.

Protection schemes, studies & relay configuration settings for all HV, 33kV, LV and DC systems.

Cable/conductor sizing calculations for all HV, 33kV, LV and DC systems within the sub-station.

Earthing system calculations for substation works shall be part of this scope. It shall consider the sub-station as an isolated standalone system.

Battery and battery charger sizing.

Auxiliary transformer sizing calculations.

Small power and lighting calculations.

Harmonic and resonance studies.

Insulation co-ordination studies.

The Contractor shall be responsible for requesting all information necessary to perform the studies from the Employer. The Contractor shall also propose and justify all design assumptions in the event that data is not available.

The sizing of all HV, 33kV and LV conductors and cables within the substation shall be undertaken by the Contractor whom shall provide design calculations demonstrating the suitability of the conductors and cables selected for the installation conditions resulting from the Contractors design. These calculations shall be submitted to the Employer for comment prior to installation.

11.2. Protection Studies and Relay Settings

The Contractor shall be responsible for protection schemes, studies and co-ordination of the130kV, 33kV and LV relay settings for the complete wind farm electrical system and its integration into the 130kV grid. The contractor shall also be responsible for appropriate selection and setting of LV protection.

The HV protection system shall be designed and be compliant with the Grid Owner requirements set out in Svenska Kraftnat TR02 series of technical requirements.

The HV protection and control panel supply shall include but not be limited to, the following;

Over-current and earth fault (OCEF) protection co-ordination with grading curvesshowing transformer and cable thermal damage curves. These relays should also


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include thermal overload function suitable for application to transformer, cable or overhead line circuits. Each circuit breaker at either 130kV or 33kV shall include an OCEF relay

Grid Interface Protection (AMP Protection) consisting of a three phase dual over and under voltage stages, dual under and over frequency and rate of change of frequency. The relay should use a three phase voltage input derived from a three phase star connected voltage transformer.

The Primary Main Protection for the 130kV OHL shall consisting of a three ended Current Differential Scheme including delayed auto reclose, open conductor and thermal overload. The relays at Moliden and Sidensjö South should include provision of two sets of three phase current inputs to enhance stability for through faults.

Back Main Protection consisting of a 4 Zone Distance (Zone 1 & 4 fast, Zone 2 and 3 time delayed) scheme to protect OHL and grid interface including directional earthfault, neutral voltage displacement, open conductor (asymmetrical current) delayed auto-reclose and thermal overload. The relay logic shall include provision for zone acceleration, permissive over/under reach schemes.

Unit protection settings including high impedance 33kV busbar protection, 130/33kV transformer differential and 130kV feeder current differential

Settings for the Automatic Voltage Control relays to control the on-load tap changer position. The protection and AVC panel design shall include schematic diagrams, detailed/wiring diagrams and panel general arrangements. The design shall include auxiliary tripping and control relays sufficient for healthy and trip signalling to SCADA.

Protection studies shall cover all equipment and systems associated with the wind farm works. The protection studies shall ensure that all faults on wind farm 130kV overhead lines or the 33kV cables are cleared within a back-up total fault disconnection time of 500mS. The protection and AVC functional settings, scheme logic and schematic drawings shall be submitted to Employer for review and comment at least one month in advance of the intended date of commissioning a circuit or system.

A Delayed Auto Reclose (DAR) scheme be included and shall activate re-energisation of each wind farm substation following an earth fault on one of the OHL feeders. The main and backup protections shall include self reset trip relays to allow reclosure and reclaim.

The Moliden-Sidensjö North OHL feeder shall be re-energised by closure of the CBs at the Moliden end. The Sidensjö South - Sidensjö OHL North feeder shall be re-energised by closure of the circuit breaker at the Sidensjö North end. Please refer to the following single line diagrams for Moliden substation (Drg: 3-320540), Sidensjö North (Drg: 01986D4304-05 SHT 2)and Sidensjö South (Drg: 01986D4304-05 SHT 1)

11.3. Earthing System & Lightning Protection Calculations

Both a grounding/earthing grid and lightning protection system shall be installed at each substation. All grounding and lightning protection works shall be designed, installed and tested in accordance with SS-EN 50522, IEC 60479-1, IEC 62305, ELSAK FS 2008:1-4, VAST-Vattenfall report “Grounding of stations and switchgear” June 1987 and comply with valid Swedish regulations at time of contract signing.

The Contractor shall ensure that the Design and Installation of the Earthing and Lightning Protection scheme satisfies the Grid Company’s technical requirements, where and ifapplicable.

The earthing system shall be installed in a manner that will limit the effect of ground potential gradients to such voltage and current levels that will not endanger the safety of


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people or equipment under normal and fault conditions, as well as assure continuity of service.

The acceptable limits for touch & step potential used in designing the earthing system shall be in accordance with SS-EN 50522.

All buried or below ground level earth connections must be made using either irreversible compressed types or exothermically welded.

The Contractors earthing design shall allow for planned future maintenance and access points to enable measurements and tests of the earthing system throughout the design life. Therefore incoming earth cables from the overhead lines and from the wind farm arrays are to be easily disconnected to allow for testing.

11.4. Harmonic Analysis Studies

The Contractor shall be responsible for harmonic and resonance analysis studies for the complete wind farm electrical system to include, but not be limited to, the following:-

Harmonic impedance profiles during all the various system configurations to identify and eliminate / mitigate any resonance problems

Harmonic injection studies – turbine and grid contribution – to ensure compliance with AMP regulations and Grid Code SvKFS2005:2 – or equivalent version at time of contract

As background harmonic data at the Point Of Connection (PoC) may not be available, the harmonic study is to be repeated when the actual measured harmonic data is available from the PQM meters installed at the 130kV PoC

The Contractor shall be responsible for the design and specification, to allow the installation and commissioning of all filters that may be required as a result of these studies. The design of each outdoor substation compound is to include for the future provision of a filter(s)together with cable ducting requirements from the switchgear room out to a suitable space allocation even if the current design study was to show no filters were presently required.

The supply of all filters, if these are found to be required, shall be via a separate contract. The design and specification work to be carried out by the Contractor, to allow specification and purchase of the filter, shall be provided to the Employer for the purposes of purchasing this filter.

The Contractor shall perform the studies and separately allow for the space required (minimum of 4m x 15m) for the future installation of the foundations for the filters units and any associated MV and LV ducting requirements even if the Contractors studies show filters are not currently required. It should be noted that the Sidensjö South substation should allow for installation of 2 off filters (1 off filter for each side of the 33kV centrally coupled 33kV board).

In the event that the local Grid Company cannot provide the back ground Harmonic measurement results for the connection point then the Contractor may have to wait until the PQM meters are installed at the 130kV connection points and monitor this connection. The Contractor shall make provision for this onsite measurement process and the requirement to complete the studies once this onsite process is complete.

11.5. Reactive Power Compensation Studies

The Contractor shall be responsible for reactive power compensation studies to specify equipment required to fulfil the technical performance requirements of the Grid Connection Agreement. The studies shall include the reactive power capabilities of the wind turbines and electrical characteristics of the wind farm electrical system cables and transformers.


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The Contractor shall provide a methodology of the proposed reactive power compensation studies for review by the Employer prior to the production of the analysis.

The Contractor shall complete and submit the analysis report to the Employer for review before procurement of any equipment.

11.6. Insulation Coordination Studies

The Contractor shall be responsible for insulation coordination studies that shall include the substations and the wind farm electrical systems attached to each substation. In addition the Contractors study shall include consideration of the 2 off over head lines and the surge arrestors to be installed on those lines by the Overhead Line contractor. The Contractor shall co-ordinate with the Overhead Line contractor to model the line and the short lengths of HV cables completing the connections into the Moliden Grid substation and the Sidensjö South substation. The Contractor shall model this over head line system and the Surge arrestors to be fitted and advise on the suitability of the selected types and the nominated positions. Provisionally these devices shall be installed on the first poles on both outgoing lines at Sidensjö North, then at the overhead line to 130kV buried cable junction at both SidensjöSouth and at Moliden Grid substation, see SLD 01986D4304. These studies shall include for any repositioning of HV equipment the Contractor may make to suit his design and the requirements to protect connected HV equipment.

The Contractor shall provide a methodology of the proposed insulation co-ordination studies for review by the Employer prior to the production of the analysis.

The methodology shall include, but not be limited to, the following:-

(a) Temporary over-voltage resulting from;

HV or 33kV earth faults, external to the wind farm 33kV earth faults, internal to the wind farm Load-rejection and short-term unearthing of the site (e.g. opening of wind

farm 33kV circuit breaker on load) Load-rejection of the overall site or either wind farm substation Non-simultaneous disconnection of the phases of the turbine transformers Linear system resonance and Ferro-resonance, during the above conditions Design and mitigation measures and provide verification studies to overcome

any unacceptable over-voltage, resulting from the above conditions

(b) Transient over-voltage resulting from lightning impulses originating from the external network or striking the sub-station

(c) Switching transient over-voltage resulting from

Fault and fault clearing at HV and 33kV: considering a range of point-on-wave case studies

Switching of HV and 33kV overhead lines/cables and no-load transformers: considering a range of point-on-wave case studies

Switching of 33kV cables and no-load turbine transformers: considering a range of point-on-wave case studies

Energisation of 33kV cables and turbine transformers: considering a range of point-on-wave case studies

Switching of 33kV reactors Load rejection: point-on-wave


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The Contractor shall complete and submit the analysis report to the Employer for reviewbefore procurement of any required mitigation equipment identified from the above studies required to overcome any unacceptable transient over-voltages. The Contractor shall also be responsible for transient recovery voltage studies to access the risks of re-strike.

It is the Contractors responsibility to co-ordinate the type of Surge Arrestor that is suitable for use with and connection to the wind turbine 33kV switchgear.


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12. ANNEX 4 – TECHNICAL SPECIFICATION – ELECTRICAL

12.1. Introduction

The Contractor shall be responsible for the electrical works of the Contract Works. This Annex provides the high level technical specification for the electrical works.

12.2. HV Switchyard

The HV switchyard transformer bays shall be provided with a disconnecting circuit breaker (with integral earth switch), VTs, CTs, earth switches and surge arrestors as shown on Sidensjö Single Line Diagram 01986D4304.

The Contractor shall review the schematic HV arrangement shown on Sidensjö Single Line Diagram 01986D4304 and revise to suit his HV design and protection requirements. However the Contractor solution must retain all intended switching functionalities and accessibility and aim at minimum maintenance.

The Contractor shall be responsible for the design, supply, installation, testing, commissioning and energisation of all equipment and materials required and for ensuring that hisspecification is suitable for the intended purpose.

This shall include all support structures, temporary earthing connection points with associated equipment and all accessories required for the fully integrated HV substation installation at both Sidensjö North and Sidensjö South.

The following basic data is applicable:

1. Designing short-circuit current 31,5 kA2. Designing earth-fault level 25 kA3. LIWL 650 kV4. LIWL across open pole 750 kV5. Highest voltage for equipment 170 kV6. Minimum creepage distance 2750 mm7. Minimum clearance phase-phase 1300 mm8. Minimum clearance phase -earth 1300 mm9. Lowest ambient temperature -50C10. Rated Voltage 170 kV

The Contractor shall allow for a 1000mm snow level when considering safety clearances for personnel and the perimeter fence height which shall be similarly increased to allow for snow level at site.

All equipment that requires to be locked shall accommodate a safety padlock

The Contractor shall install shield wires and towers for lightning protection of outdoor parts of the substations.

12.3. HV Surge Arrestors

The Contractor shall be responsible for the detailed specification and location of the HV surge arrestors within the HV substation.

Preliminary design data for HV surge arresters:Rated voltage 170 kVClass 10kA


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Line discharge class 4Earth-fault factor 1.3

The Contractor shall be responsible to ensure that the surge arrestor specification is co-ordinated with the requirements of the insulation co-ordination studies and the location of HV units to be protected. The Contractor shall ensure that all selected surge arrestors, including those of the overhead line contractor, are analysed and documented within the insulation coordination study to provide justification of their selection and locations.

Surge arresters shall be designed & tested according to technical guidelines TR1-12E and shall be provided with composite isolators and insulated feet.

The Contractor shall install an insulated earthing conductor from the surge arrester to the substation earth grid that will allow the Employer to measure and record the leakage current. The Contractor shall provide surge counters on the HV surge arrestors. These counters shall be visually monitored (from ground level) only as part of routine HV maintenance.

12.4. HV Voltage Transformers

The Contractor shall be responsible for determining the detailed specification of the voltage transformers including the rating and electrical parameters and for ensuring that the accuracy and specification is suitable for the intended purpose.

The voltage transformer shall provide the functions of tariff metering, indication, protection, monitoring and control.

The specification of the VTs may be provided by the Grid Owner or be to current Swedish standards, to be agreed at Contract stage.

Voltage transformer shall be designed, installed and tested according to TR1-05.

12.5. HV Switchgear

The Contractor shall be responsible for the detailed specification of the HV switchgear for ensuring that the specification is suitable for the intended purpose. The Contractor shall provide a solution using disconnecting circuit breakers with combined earthing switch. The over head lines shall use temporary earths supplied by the overhead line contractor and so do not form part of the substation scope of supply

The HV switchgear shall be compliant with the required Swedish codes for high voltage equipment and IEC standards as applicable.

The following electrical requirements shall be employed unless exceeded by local standards or IEC in which case the higher values shall be used.

Preliminary design data for the disconnect switches:Rated current 630A

800A (North Sub - Moliden Line Sw.)Rated voltage 170 kVRated withstand capacity 31,5 kA, 3 s

Preliminary design data for the disconnecting circuit-breaker:Rated current 2500 ARated voltage 170 kVRated breaking capacity 31,5 kA, 3 sOperation Independent single-pole operation with

synchronised point-on-wave control


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Operation and motor voltage 110 V DCHeating voltage 230 V AC

It shall be easy to remove connections from both sides of the disconnecting circuit-breaker for maintenance. With connectors removed from the circuit-breaker, safety distance shall be ensured in accordance with the safety instructions.

It shall be possible to remove and reconnect conductors, clamps should be of the type pad –pad. This means that the connection between tube and stranded cable in the bay shall consist of two clamps, one for the tube and one for the wire, both ending with pads that shall beclamped together.

The Contractor shall provide the facility for the disconnector circuit breakers to be remotely tripped from the Grid Owner’s control centre. This facility shall be built into the SidensjöNorth and Sidensjö South substation HV CB’s and shall be transmitted over the OPGW fibre optic system

The disconnector shall be lockable to ensure that it cannot be operated during possible maintenance works. Locking with padlock is acceptable.

Breakers shall be designed and tested according to relative parts of SS-EN 62271 & SS-EN 62271-108.

The Contractor shall also ensure full compliance with the technical requirements as stated in the separate NV Specification – EPC Sidensjö Electrical Specification, Appendix A, ECM 01986-007083. The relevant sections of which has been extracted and reproduced in Annex 7 of this specification.

12.6. HV Current Transformers

The Contractor shall be responsible for determining the detailed specification of the current transformers including the ratio, rating and electrical parameters and for ensuring that their accuracy and specification is suitable for their intended purpose.

Where possible the HV current transformers have been specified to be installed in the HV turrets of the grid transformers and are included in the grid transformer technical specification provided in the employer supplied documentation. CTs that cannot be fitted into the HV turrets of the grid transformers shall be supplied by the contractor in either the disconnecting CB’s or suitable free standing units etc.

The Contractor shall be responsible for the integration of the grid transformers into the Substation Contract Works and shall provide HV current transformers as required in the event the grid transformer specification does not fulfil the substation requirements.

The specification of the CT’s for tariff metering may be provided by the Grid Owner or to Swedish standards, this shall be confirmed at Contract stage.

The Contractor shall be responsible for determining the detailed specification of the current transformers including the rating and electrical parameters and for ensuring that their accuracy and specification is suitable for their intended purpose for the CTs to be installed in the new Moliden substation 170kV CB. This shall include the requirements of the primary and back up protection systems (and matching to Sidensjö North), the Power Quality Meter, WF Check (Tariff) Meter and the Wind Turbine controller to be installed at Moliden.


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12.7. 33kV Switchgear

12.7.1 General

The Contractor shall be responsible for the design, supply, installation, testing, commissioning and energisation of all equipment and materials and works required up to full completion and for ensuring that the specification is suitable for the intended purpose.

The 33kV switchgear shall be provided as shown on Sidensjö Single Line Diagram 01986D4304and shall be erected in a dedicated Switch room in a section of the associated substation building.

A schematic solution other than shown in Sidensjö Single Line Diagram 01986D4304 may be proposed by the Contractor but the solution must retain all intended switching functionalities and accessibility and aim at minimum maintenance.

The switchgear shall be withdrawable air insulated metal-clad and of design class P1, meaning that it will have one or more inner walls of non-metallic material. Switchgear of class PM with metallic inner walls may also be offered. The switchgear design shall be such that the busbars can be in operation during working on other parts of the switchgear (class LSC2A).

The cable termination shall be at the rear of the switchgear and shall use Pfisterer connections to achieve fault levels required.

The 33kV switchgear cubicles shall be provided with internal arc detection and tripping protection in the cable box areas. The protection may be either light or pressure activated.

The 33kV switchgear busbar sections shall be provided with internal arc detection and tripping protection in the busbar areas. The protection may be either light or pressure activated.

The 33kV switchgear to be installed at the wind farm shall be type tested to be certified as full arc-containment. Over pressure exhaust channels shall be arranged from the switchgears cubicles and be routed directly from the switchgear through the buildings outer walls for pressure relieve in event of occurrence of over pressure caused by electrical shortcuts in the switchgear

Capacitive measuring outlet shall be provided on all panels and busbar for voltage and phase balance measurement. Voltage present indicators shall be installed at the rear of the panels with warning labels on the front of the panels advising personnel of the location of the detection devices.

The Contractor shall provide all protection relays in separate free-standing relay panels in the Control room. Protection relays located in the switchgear panels will not be accepted.

The control equipment shall be placed in a separate low-voltage compartment in each switchgear cubicle/compartment. All internal panel wiring of apparatus in the switchgear shall be marked with a unique cable and part number.

The operational switches e.g. Trip/Neutral/Close shall be duplicated onto separate free-standing panels located in the Control room.

All auxiliary contacts shall be wired through to the LV marshalling box on switchgear for use by SCADA in presenting switchgear statuses on Human Machine Interface (HMI) and separate control panel/MIMIC mounted in the Control room. In addition to all signal requirements for the substation use the equipment shall be supplied with 2 spare auxiliary contacts provided for future use.


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The Contractor shall be responsible to ensure the selected switchgear allows for termination of the required 33kV cables and associated surge arrestors.

The new switchgear shall have the following basic design data:

Rated short circuit current 25 kA, 3 sLIWL / PFWL 170 kV / 70kVHighest voltage for equipment (Um) 36 kVMinimum creepage 580 mmMinimum clearance 320 mmProtection degree IP42Current Ratings;Busbars / Transformer panel / Feeder panels 2500A / 2500A / 1250A

Approved type test certificates shall on request be presented before commissioning is allowed.


12.7.2 Standards and Technical Requirements

Metal-clad manufactured switchgear shall be designed and tested according to SS-EN-62271-200. Requirement for support insulators are given in SS IEC-273 and SS-EN 60168.

Applicable standards and IEC/TR 60815 shall be followed.

TR1- 02E Cable current transformers 12 – 170 kVTR1- 04E Self-contained magnetic current transformers

7,2 – 52 kVTR1 – 05E Self-contained magnetic voltage transformers

7,2 – 420 kVTR1 – 08 Circuit breakers 12 – 420 kVTR1 – 12 Self-contained surge arresters for 12- 420 kVTR1 – 13 Insulation levels standard voltages for

equipment > 1 kV

12.7.3 33kV Circuit Breakers

The Contractor shall be responsible for the detailed specification of the 33kV circuit breakers and for ensuring that the specification is suitable for the intended purpose.

The 33kV circuit breakers shall be compliant with the required Swedish codes for high voltage equipment and IEC standards as applicable.

The following electrical requirements shall be employed unless exceeded by local standards or IEC in which case the higher values shall be used.

The Contractor shall provide circuit breakers that have, as a minimum, the following specifications;

a) Truck-mounted 3-pole circuit breaker

b) Switching media: Vacuum or SF6. All breakers shall be able to trip mechanically from the front side of the cubicle (Emergency tripping)


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c) Local I/O and controls can be operated from front side of the cubicle by selecting switchgear Local/Remote switch into ”Local” position.

d) Truck can be locked with padlock in switched-on and isolation positions. The padlock parts shall be supplied with the trucks.

e) Interlocking against connecting and separating of operating breaker.

f) Earthing switch shall be mechanically interlocked so that earthing switch shall inhibit the switching of the breaker into the ON position

g) Truck and circuit positions shall be visible from the front side of the cubicle or indicated by reliable indication device. The indicating device shall be tested according to SS-EN 62271-102

h) The CB’s shall be provided with 2 off trip coils. First coil from Primary battery that provides normal and emergency DC supplies. The second coil from the Secondary battery. Trip circuit supervision should be provided for both Trip relays and signalled out to the HMI and Control panel/MIMIC.

i) Operating device equipped with:

a. Motor 110 V DC 1s

b. Close - In and Open - off coil / magnets 110 V DC 1s

c. Required auxiliary contact for local and remote indication

d. Indication of charged spring in the device

Technical guidelines TR1-08 shall be applicable.

12.7.4 Earthing Switch

The Contractor shall be responsible for the detailed specification of the earthing switches and for ensuring that the specification is suitable for the intended purpose.

The Contractor shall provide circuit breakers that have, as a minimum, the following specifications;

a) 3-pole earthing switch with instantaneous switching

b) Earthing switch shall be locked with padlock in switching on and open position; the padlock parts shall be supplied with the earthing switch.

c) Interlocking so that earthing can take place with the truck in separation position.

d) Earthing switch in the busbars blocks against incoming breaker with the voltage on the busbars.

e) Earthing switch shall have the required auxiliary contact for local and remote control.

f) Position indicator shall be visible in the front side of the panel.

g) Earthing switch in the incoming panel shall be equipped with interlocking magnets.

h) Earthing switch in the incoming Grid transformer panel shall be interlocked with transformers 130kV side isolator.


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Technical guidelines TR1-09 shall be applicable.

12.8. 130kV and 33kV Voltage Transformers

The Contractor shall be responsible for determining the detailed specification of the 33kV voltage transformers including the rating and electrical parameters and for ensuring that their accuracy and specification is suitable for their intended purpose.

The function of the 33kV voltage transformer shall be for tariff metering, indication, protection, AVC control, monitoring and SCADA.

Preliminary design of the 33kV voltage transformer:

Highest voltage for equipment (Um) 36kVRatio 33kV/√3:110V/√3, 110V/√3 -110V/3Metering/Measurement winding 25 VA class 0,2Tertiary windingInsulation Voltage Factor

50 VA class 3 P1.9

Preliminary design of the HV 130kV voltage transformer:

Highest voltage for equipment (Um) 170kVRatio Primary winding:

Adjustable across 132kV/√3 – 154kV/√3To be operated at 145kV/√3Secondary winding: 110V/√3:110V/√3:110V/3(open delta)

Metering/Measurement winding 25 VA class 0,2Tertiary windingInsulation Voltage Factor

50 VA class 3 P1.5

The 33kV voltage transformer shall be a 3 winding inductive type with two three phase star and one residual open delta winding and connected on the 33kV incoming cable side of the individual connected grid transformer. The 33kV voltage transformer shall consist of either three off single phase VTs or a 5 limb core type three phase VT. The primary VT winding shall be solidly earthed on the 33kV neutral point

The voltage transformer shall be provided with isolation and earthing switch and with protection for primary windings, secondary terminals and tertiary terminals.

The voltage transformer shall be in according with SS-EN-60044-2. The technical guidelines TR1-05 shall be applicable.

All voltage transformers are to be connected to the separate protection and control panel which shall be provided complete with a secondary voltage injection test facility.

Voltage transformers used for metering, SCADA & monitoring shall be wired through to their associated terminal rail within the secondary wiring compartment of the switchgear.

Voltage transformer windings are to be dedicated to metering, indication, protection, and wind farm neutral voltage displacement requirements, with separately fused secondary output groups clearly labelled.

Documentation of the metering system including measuring circuits intended for metering and relay protection shall be provided to the Employer for review prior to detailed design.


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12.9. 130kV and 33kV Current Transformers

The Contractor shall be responsible for determining the detailed specification of the current transformers including the rating and electrical parameters and for ensuring that their accuracy and specification is suitable for their intended purpose.

Only one ampere secondary current transformers may be used for the protection system. If possible the standard ratios set out in Svenska Kraftnat TR1-02E should be used, but as analternatively standard CT ratios as set out in IEC 60044 can also be used.

The Contractor shall be responsible for all 130kV and 33kV current transformers provided and contained within the switchgear or power transformers. The quantity and arrangement of the current transformers are shown on Sidensjö Single Line Diagram 01986D4304 The Contractor shall review and revise as require to meet the overall project requirements.

Standard SS-EN 60044-1Metering/Monitoring & SCADA Core Class 0.2s Fs5Protection Core Class 5P20

All primary/secondary turns ratios and VA rating/ burdens shall be determined by the Contractor. The secondary of the protection and metering class current transformer shall be 1A and dedicated to the metering/monitoring & SCADA function. The current transformers for the protection relays shall meet or exceed the guidelines of the protection relay manufacturer.

Short circuit durability (Ith) shall be selected from the series 16, 20, 25, 31.5, 40, 50, 63kA. The facility for short circuiting the secondary tails of all current transformers, with removable links, shall be provided. All current transformers shall be connected via a panel mounted current injection test facility.

Current transformers shall be wired through to their associated terminal rail within the secondary wiring compartment of the switchgear. All spare current transformer cores shall be short-circuited and earthed.

12.10. 33kV Surge Arrestors

The Contractor shall be responsible for the detailed specification of the 33kV surge arrestors as shown on Sidensjö Single Line Diagram 01986D4304 and for ensuring that the specification is suitable for the intended purpose.

33kV Surge arrester shall be preliminary dimensioned for:

Rated Voltage 33 kV Class 10 kA

The Contractor shall be responsible to ensure that the surge arrestor specification is co-ordinated with the requirements of the insulation co-ordination studies.

The Contractor shall ensure that all selected surge arrestors are analysed and documented within the insulation coordination study to provide justification of their selection.

The supplied surge arrestors shall be in accordance with TR1-12E.

12.11. 33kV Reactive Power Compensation

The Contractor shall be responsible for a reactive power compensation scheme that shall be determined from the Contractors electrical system design works.


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It is expected that this scheme shall include a 33kV switched shunt reactors located at the substation and as shown on Sidensjö Single Line Diagram 01986D4304.

The design and construction of the outdoor compound shall include the spacing and ducting requirements for the installation of the required reactors and any associated 33kV and LV ducting requirements within the substation compounds and buildings.

The Contractor shall allow for the provision of a suitable controller(s) at both Sidensjö North and Sidensjö South (that will require 2 off independent controllers) to switch IN or OUT the connected reactor as and when required.

The purpose for installing the 33kV switched reactors is to ensure grid compliance. This requires Zero VAr flow at the Moliden 130kV PoC, under the condition of zero WF generation (no-wind) operating conditions. This assumes the voltage at Moliden PoC is set to Un = 145kV (1.0pu) and the windfarm substation 33kV busbar voltage is regulated to 33kV (1.0pu) by the local OLTC(s). However, the reactors are to be switched OUT during conditions of generation to reduce system losses.

The control signal for switching these units IN/OUT shall originate from the 33kV MW level of the associated transformer (this item is to be agreed at the detailed design stage) with the Reactor being switched IN upon the 33kV MW level reducing below a threshold setting, and the Reactor switching OUT upon the 33kV MW level increasing above a threshold setting. The appropriate control settings are to be determined by the Contractor with a sufficient dead-band/hysteresis range to ensure minimum optimized reactor switching operations.

Shunt reactors shall be designed and tested according to the applicable technical guidelines TR1-11E and SS-EN 60289.

It is expected that Sidensjö South shall require 2x 2.33MVAr rated reactors with a Q-Factor of ≥50 while at Sidensjö North shall require 1x 3.15MVAr rated reactor with a Q-factor of ≥50.Where the Sidensjö North reactor has been sized based on the stand-alone requirements of the Sidensjö North windfarm and Sidensjö North-to-Moliden 130kV OHL only. The Sidensjö South reactors have been sized based on the requirements of the complete installed Sidensjö project which then encompasses the North to South overhead line as well as the South substation.

The approximate reactor values for all 3 off reactors shall be revised by the contractor during his system studies and the exact values agreed with the Employer before order placement by the Contractor.

The reactors may be designed to be operated either with the 33kV windings unearthed, or with the neutral-earthed. If the neutral is earthed, any increase in the 33kV single phase-to-earth fault level when the reactor is connected is no greater than an additional 150% of the single phase-to-earth design fault level when the reactor is disconnected. If the reactor is anunearthed type, then specific design consideration shall be given to the possible need for specific surge arrester characteristics on the phase terminal connected surge arrestor units in order to mitigate against any excessive temporary or transient over-voltages.


12.11.1 Reactor Switching

The switching of each of the reactors shall be via dedicated reactor contactor switching units mounted local to the reactor as shown on the SLD 01986D4304. These reactor contactor


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switching devices shall be switched IN and OUT by Substation supplied and installed control relays (1 off control relay per reactor) when the wind farm generation from the associated turbine array, for which the reactor is compensating the cable capacitance for, is at or just below 15% of the connected rated generation capacity. The Contractor shall ensure the reactor is not switched IN/OUT in a rapid sequence by applying an appropriate dead-band/hysteresis setting to this switch point. The Contractor is to ensure grid compliance at the Moliden 130kV PoC with a max operating tolerance of +/-3.3MVAr under zero generation (no-wind) conditions is to be maintained throughout the full Min to Max Operating Voltage range, as seen at the Moliden PoC. All reactor switching control shall be via the Contractor supplied and installed WF substation control units. No inputs from the turbine controller shall be required or available for these reactor control relays.

Under windfarm generation conditions, when the turbines are connected and available to provide reactor power support, overall windfarm reactive power grid compliance at the Moliden 130kV PoC shall be maintained by the turbine supplied Grid Monitoring Station (GMS) controller.

Operation of these reactor contactor switching devices shall not cause system disturbances and if necessary shall incorporate a means for reducing switching transient voltages to acceptable levels.

The contactor switching unit shall be capable of switching the reactor for 100,000 operations before major maintenance is required

If the rated minimum operating temperature of the contactor switching unit does not comply with the project Minimum Temperature, as stated in Section 6.1, the contactor switching unit shall be fitted with a protective feature to inhibit its operation at temperatures below its rated minimum operating temperature.

12.12. 33kV Neutral Point Equipment

12.12.1 General

The Contractor shall be responsible for detailed design, supply, installation, testing, commissioning and energisation of all equipment required to form the 33kV neutral point. An earthing transformer and a neutral earthing resistor shall be provided for the MV systems as shown on the Sidensjö Single Line Diagram 01986D4304, this shall provide an earth reference point and earth fault current limitation for each MV system as shown.

At Sidensjö North it is intended that the primary LV supply for the wind farm sub-station shall come from the Grid Transformer auxiliary winding but that the 33kV earthing transformer shall form a back up to the Grid Transformer Auxiliary winding should an LV supply be required and the Grid transformer auxiliary winding not be available.

At Sidensjö South it is intended that the primary and secondary LV supplies for the wind farm sub-station shall come from the 2 off Grid Transformers auxiliary windings.

Therefore, the 33kV earthing and auxiliary transformers shall include the following facilities detailed below. The Contractor shall therefore supply 3 off identical units with only the resistance/reactance being varied to suit Sidensjö North or South if required.

12.12.2 33kV Earthing Transformers

The earthing transformer shall be designed and tested according to the applicable technical guidelines TR1-10E and SS-EN 60076.


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Preliminary technical data for earthing transformer;

a) Three phase oil isolated transformerb) Connection group ZN0yn11c) Rated current 100A (58 A per phase) for continuous operation.d) Rated voltage 33 kV (Um = 36kV) / 420 Ve) Guaranteed no-load loss of ≤1kW @ 1.0pu voltagef) Rated secondary power - minimum of 250kVA, but to be equal or greater than the

auxiliary supply provided by the 130/33kV grid transformer. g) Zero sequence Z max /phase to be determined by Contractor in consideration to

overall system design and 33kV system limited earth fault current to approximately 100A (with 33kV reactor disconnected).

h) Temperature and pressure instruments shall be available

The Contractor shall be responsible for the specification and design of the earthing transformers and the neutral earthing resistors (NER) to provide a fully integrated systemassociated with each 33kV board in line with the SLD.

The Contractor shall give consideration with respect to equipment optimisation (losses) and shall provide information on load and no-load losses of the units.

The earthing transformer circuit breaker shall be interlocked with the main Grid transformer switchgear to prevent an unearthed and live 33kV system. This shall include for the bus bar section CB in the case of Sidensjö South and the possible operating modes there and the requirement to have only 1 off earthing transformer and NER connected to a 33kV system.

The Contractor shall submit to the Employer a program that covers all standard and type tests with final check for approval prior to the start of manufacturing. The Employer or his representative shall witness the FAT. Before the SAT the neutral point of the transformer and the NER shall be completely installed ready for operation.


12.13. Interlocking of Switching Devices

The Contractor shall be responsible for developing an interlocking scheme for the substations. A system of interlocking shall be provided on the HV switching equipment the 33kV circuit breakers, disconnectors and earthing switches. This scheme shall ensure isolation and earthing of grid transformers is controlled through mechanical key interlocks. This shall extend to proof of isolation and earthing of equipment fed from the 33kV switchgear and its own busbar earthing switch. The schemes shall be agreed with NV before manufacturing starts. The supply of all the required key exchange boxes shall be part of the Contractors scope of supply.

The basic requirements are laid out below, but it shall remain the Contractors responsibility to develop these basic requirements into a fully functioning system.

The interlocking system shall for all switching devices be based only on detection of the switching device position and therefore not be based on voltage- or current sensors.

The interlocking shall be used for all remote control actions.

For hand operated equipment in type tested enclosed switchgear, mechanical interlocking shall exist between equipment in the same compartment to prevent mal-operation. The interlocking system shall continuously detect actual operation conditions and immediately


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after a connection adapt to the new connection situation. Only positive information shall be used, i.e. actively closed contacts for circuit-breaker and disconnector shall be used for both positions.

A separate interlocking system shall be used for each voltage level in the substation. The interlocking systems shall be independent from each other.

The basic function of the operation interlocking shall be that disconnectors:

a) Shall not close or interrupt load currents

b) Shall not connect a live part to ground

c) Shall not connect different voltage systems

A disconnector that is in series with a circuit-breaker without any branching between them must only be operated when the breaker is in the position OFF or open.

The interlocking system for each feeder/incomer cubicle earth switch shall be based on the mechanical interlocking with the disconnector or circuit-breaker position and voltage detection within the individual equipment cubicle to provide the interlocking of that cubicles earth switch.

An earthing switch that is built together with a disconnector shall be interlocked to allow operation only when the disconnector is in the open position.

For separate or stand-alone earthing switch on the switchgear bus bar the interlocking shall be based only from control voltage detection ‘’proving’’ the bus bar connected CB’s and disconnectors are open and / or feeders have earths applied. Alternatively a mechanical key system may be proposed that proves feeders are open / earthed as appropriate.

At the Sidensjö South substation the 33kV bus-section circuit breaker shall be mechanically interlocked with the power transformer low-side circuit breakers to prevent parallel operation of these two transformers.

12.13.1 Specific Turbine Interlocking Requirements

The Contractor shall be required to interface with the Turbine Contractor, the Wind farm Cable Infrastructure Contractor the Overhead Line Contractor and Grid Owner as required for an overall integrated scheme.

The following is the specific scheme the turbine supplier is advising is their safety requirements to protect operators and connected equipment, based on Siemens document:

‘Interlocking specification’ rev.1.doc, Revision date 120611, section ‘Interlock with Grid’.

The substation 33kV turbine array feeder CBs will release a proof of feeder earthed key only when the feeder is locked in the outgoing circuit earthed position. This proof of earthed key, supplied by the Contractor, shall then be used to act as a permissive key to apply earths at selected turbines via a key exchange box. There shall be one such key exchange box per 33kV collector circuit CB. The key exchange boxes shall be supplied by the Turbine Contractor and free-issued to the Contractor to be fitted within the substation Switch room. The Contractor shall co-ordinate with the Turbine Contractor to ensure that the exchange boxes shall accept the Substation feeder proof of earthed key and then release 1 permissive to earth the turbine key for each connected turbine. The system shall be a trapped key system requiring return of all turbine permissive to earth keys before the substation feeder earth can be removed.


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The Substation 33kV feeders also require a permissive to apply an earth to the array cables to protect turbine control equipment from being short circuited. The permissive system shall be that when a turbine disconnector/isolator is opened it releases a key. When all these ‘’open’’ keys are collected at the substation they are inserted into a Turbine Contractor supplied and co-ordinated key exchange box, free-issued to the Contractor to be fitted within the substation Switch room. This releases a Permissive to apply earth to substation feeder CB to allow earthing of the outgoing circuit. There shall be one such key exchange box per 33kV collector circuit CB.

There will therefore be a total of two key exchange boxes per 33kV collector circuit CB.

The Contractor will lease with the Turbine Contractor to ensure co-ordinated installation and operation of this interlock system.

The Contractor shall submit an interlocking scheme to the Employer for review prior to specification or manufacture of switchgear. The Contractor shall review the NV SLD 01986D4304 to clarify the Array CB’s affected and the turbines connected to that CB

This permissive to earth at Substation and proof of earthed key shall be extended to include the MV Isolation and metering Kiosk MVK1 fed from MVCB23. The Contractor shall make provision for this in the Sidensjö South interlock system. However, in this particular instance the Contractor shall liaise with the Cable Infrastructure Contractor, who will supply and free-issue the associated key exchange boxes to be installed at the Sidensjö South substation.

12.14. Protection Relay Systems

12.14.1 General

The Contractor shall design, supply, install, commission and test the electrical protection system which together with the lightning and earth protection system will safeguard personnel and the plant. Cabling and equipment shall be designed such that in the event of a fault occurring, the faulty plant is safely disconnected without undue delay and will fail to safe.

The Contractor shall ensure that the protection design of the Wind Farm is fully coordinated with that of the Grid Company and that of the wind turbines.

The Contractor shall perform protection studies and provide relay settings for the complete wind farm electrical system. These studies shall include all connected equipment thermal damage curves/data within the final report and any considerations from SvKFS 2005:2 applicable to the Wind Farm development and its grid connection.

The Contractor shall demonstrate that the protection co-ordination used has been selected across the different CB’s to ensure the connected equipment is disconnected from the faulted systems prior to thermal damage being sustained in the connected, and non faulted, equipment while minimizing interruption to non faulted equipment.

The protection and control relays for this project shall be contained within dedicated panels located in the associated Control rooms.

The HV and the 33kV switchgear shall be required to interface with these panels. All CT’s, VT’s, control contacts, auxiliary contacts and devices shall be wired to terminal rails located within a separate LV secondary wiring compartment (one per HV or 33kV circuit breaker, HV disconnector or metering cubicle/panel), forming part of the HV or 33kV switchgear.

These LV compartments shall have adequate space for both terminating and the dressing of cables. These compartments shall then be cabled to the respective protection and control relay panels in the control room.


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The Contractor shall be responsible for the design, supply, setting, testing and commissioning of all protection systems within the substation including that associated with the Grid Transformer and the 33kV feeders looking out to the turbines.

Grid transformer protection is to include as a minimum, transformer differential protection, Buchholz Gas and Surge, winding temperature trip and alarm, over-current and earth fault protections, backup protection arrangements, etc.

Relay protection shall fulfil the following technical requirements:

Nominal measuring voltage: = 110 V ac, 50 HzRated Secondary current: = 1 or 5AAuxiliary voltage = 110 (or 24) V dcMax rated load, current circuit = 1 VA at 1 and 5 AMax rated load, voltage circuit = 1 VA at 110 VCurrent threshold failure level = 4*In continuous, 100*In, 1 sVoltage threshold failure level = 1.4*Un continuous, 2*Un, 1 sRelative moisture in air = <95%Reset level of protection function = >95%Reset time of protection function = <100 msMaximum instantaneous function time = <40 ms

The protections shall function correctly for ambient temperatures in the interval 0 to +55 degrees.

Connectors for current measurement circuits shall be designed for connection of at least one conductor with area 2.5 mm². Other connections shall handle at least two 1.0 mm² conductors.

Flat pins for connection of current measurement are not acceptable.

Testing of protection shall be possible without taking plant primary equipment out of service. All protection shall therefore be equipped with test connectors for secondary injection. Testing shrouds for all types of delivered testing connectors shall be included.

All measuring voltages, test currents, start and trigger pulses shall pass the test connector.

Protection relays shall be equipped with internal clocks. The clock shall be of real-time performance. The clock shall be synchronized with GPS-equipment. One system for time synchronization shall be included for all equipment installed at the sites. It shall be the responsibility of the Contractor to ensure equipment supplied by other parties is part of this time synchronisation.

Complete software tools and manuals for relay protection and other computerized equipment for configuration and data network management, including data cables, shall be included.

Each protection shall be equipped with individual start indications for each phase and separate start and trigger indications for each step and in some cases also time counters. Indication shall be optic, not self-acknowledged.

Except for the optical indication, it shall be possible to transfer starts, triggers and error signals to local station control and remote control.

Relay equipment shall be provided with signs in English & Swedish text. Signs shall show functions, start and trip indications.


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Indications on relay protection shall not disappear in case of auxiliary voltage interruptions. Trip circuit supervision shall be provided with monitoring alarm.

All circuit breakers shall be fitted with Breaker Fail protection that shall trip the up-stream circuit breaker upon Breaker Fail operation.

Relay protection shall not be provided with internal batteries of any kind to ensure settings during auxiliary power interruptions. Relay protection shall be equipped with self-monitoring equipment; auxiliary voltage shall be monitored.

All protection and automatic control systems that are connected to high voltage equipment shall fulfil interference testing according to:

SS-EN 60255-20-1SS-EN 60255-20-2 Class 3SS-EN 60255-20-3 Class 3SS-EN 60255-20-4 Class 3SS-EN 60255-20-5 Test voltage level to ground 2 kVSS-EN 60255-20-6SS-EN 60255-20-7 Class A

The Contractor shall install 400V impedance protection relay for the monitoring of the wind farm substation supply sourced from the Grid Transformer auxiliary winding. The 3 phase & neutral input shall be from the Grid transformer auxiliary winding in line with TR1-10E clause 13.9. This relay shall indicate an alarm in the event of it operating which shall be flagged out on the station protection system.

This section is also to be read in conjunction with the Sidensjö Single Line Diagram 01986D4304, SCADA Signal List 01986-008942, SCADA & Communications Block Diagram 01986D4501, SCADA Fibre Cable Layout 01986D4502, Sidensjö Wind Farm Substation SCADA and Communications Technical Specification 01986-010598 and Sidensjö Fibre Optic Cable Specification 01986-010189.

The protection system shall comply with the latest requirements of the appropriate GridCode (SvKFS2005:2) and Grid Connection Conditions as applicable.

The makes and types of protective relays shall be advised in the tender.


12.14.2 Tripping Schemes for 33kV Circuit Breakers

The protection system shall consist, as a minimum, of the following tripping schemes. It shall be the Contractor’s responsibility to fully develop the wind farm tripping scheme:

33kV Lock-Out Trip – This tripping scheme shall be activated by operation of the following protection schemes:

Instantaneous and IDMT Over-Current Instantaneous and IDMT sensitive Earth Fault Neutral Voltage Displacement protection when activated from fault within WF Earthing and Auxiliary transformer protective device fault Reactive Power Compensation equipment fault Filter imbalance/earth fault Grid transformer protective device & neutral Voltage Displacement


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http://ecm1/livelink/livelink.exe?func=ll&objId=21124283&objaction=download&vernum=14


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Wind Farm Emergency Stop/ Trip Substation Emergency Stop Outdoor substation Emergency stop Busbar protection Activation of an arc detection unit Remote trip from Grid Company of 33kV Turbine feeder CBs

Activation of this tripping scheme is to result in the following operations:

Trip & Lock Out – Associated 33kV circuit breaker/s

33kV Auto Re-Close Trip – This tripping scheme shall only be activated following operation of the following protection schemes:

33kV Under Voltage 33kV Over Voltage 33kV Under Frequency 33kV Over Frequency 33kV Neutral Voltage Displacement – when not activated from within WF 33kV Loss of Mains – Rate of Change of Frequency

The Contractor shall be responsible for the AMP protection settings. The specification of the AMP relay protection settings may be provided by the Grid Owner or to Swedish standards, this shall be agreed at Contract stage.

Conditions being outside normal AMP parameters will result in the following:

Open – Wind farm Feeder 33kV Circuit Breakers

Once the following criteria have been met the required wind farm feeder circuit breakers shall single shot auto-closed once healthy grid conditions have been restored and an adjustable reset time delay has expired:

Reset of all Grid Interface (AMP) Relay functions (reset delay 0 – 15 minutes). 33kV Re-Close Trip Relay reset 33kV Circuit breaker set to Automatic operation 33kV Circuit busbar terminal energized

33kV Manual/Remote Trip – Activation of this scheme for the relevant circuit breaker is to result in the following operation:

Trip – 33kV wind farm turbine array feeder circuit breaker Trip – 33kV incoming grid transformer circuit breaker (to include for Grid

company trip option) Trip – 33kV earthing/auxiliary transformer circuit breaker Trip – 33kV RPC circuit breaker Trip – 33kV Harmonic filter circuit breaker

33kV Breaker Fail – Activation of this scheme for the relevant circuit breaker is to result in the following operation:

33kV wind farm turbine array feeder circuit breaker fail protection shall trip the up-stream 33kV incoming grid transformer circuit breaker

33kV earthing/auxiliary transformer circuit breaker fail protection shall trip the up-stream 33kV incoming grid transformer circuit breaker

33kV RPC circuit breaker fail protection shall trip the up-stream 33kV incoming grid transformer circuit breaker


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33kV Harmonic filter circuit breaker fail protection shall trip the up-stream 33kV incoming grid transformer circuit breaker

33kV incoming grid transformer circuit breaker fail protection shall trip the up-stream 130kV incoming grid transformer circuit breaker

Fault ride through requirements - It should be noted that the ability for the wind farm to continue generating during faults on the utility system is a requirement for this project. The requirement is illustrated graphically in Figure 1.

Figure 1 Fault Ride through Capability

The wind turbines shall remain connected for fluctuations in the voltage on one or more phases at the Point Of Connection (PoC) down to 25% for 0.25 seconds and then 90 % voltage, which are then maintained.

Failure for the system to return to the parameters specified by the Grid Company after this time will result in the following:

Trip – 33kV Wind Farm turbine array Feeder Circuit Breakers

Remotely generated trip signals - The substation protection system shall have the facility to accept a trip signal generated by the turbine controller, the Grid Company or similar, and shall trip out the turbine array feeder circuit breakers. This requirement is further detailed in the relevant section of this specification.

12.14.3 Tripping Schemes for HV Circuit Breakers

The Protection System consists of the following Tripping Schemes as a minimum, it shall be the Contractor’s responsibility to fully develop the wind farm tripping scheme in line with Swedish HV requirements which shall include the functional requirements of the AMP protection for the wind farm.


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The requirement is that the AMP protection is implemented at the 33kV level for the Wind Farm array feeders CB’s to minimise the risk of Grid disconnection but have the AMP requirements and features built into the HV level for future use should they be required.

HV Lock-Out Trip – This tripping scheme shall be activated by operation of the following protection schemes:

Activation of two or more phase elements of overhead line differential Activation of any of the distance protection phase fault elements Instantaneous and IDMT Over-Current Instantaneous and IDMT Earth Fault from within wind farm HV connections Thermal Overload Received inter-trip signal from the Grid Company Grid transformer protection including transformer tank device (e.g. DGPT2)

operation & neutral Voltage Displacement Substation Emergency Stop Outdoor substation Emergency stop Transformer over fluxing - volts/hertz

Activation of this tripping scheme is to result in the following operations:

Trip & Lock Out – Associated HV circuit breaker

HV Auto-Close Trip – This tripping scheme shall only be activated following operation of the following protection schemes:

HV Under Voltage HV Over Voltage HV Under Frequency HV Over Frequency HV Neutral Voltage Displacement – where not activated from within WF HV Loss of Mains Transient over-voltages such as lightning strikes

Re-closure of the HV CB shall be instigated via the return of the voltage subject to the minimum following criteria. Once the following criteria has been met, the HV CB shall single shot re-close after an adjustable time delay (range 0 – 15 minutes).

HV Re-Close Trip Relay reset HV Circuit breaker set to Automatic operation HV Circuit busbar terminal energized

The above protection features or functions shall be built into the HV protection system so they are ready to be used at a later date. However only the HV over voltage shall be used to trip the HV connection at the time of construction and initial operation to prevent damage by the over-fluxing of the transformer, the voltage at which this occurs shall be agreed between the Contractor and the transformer manufacturer. The other tripping functions shall be built into the protection system and their use and trigger levels agreed during the contract phase.

130kV Breaker Fail – Activation of this scheme for the relevant circuit breaker is to result in the following operation:

Sidensjö South 130kV incoming grid transformer circuit breaker fail protection shall trip the up-stream 130kV line circuit breaker at Sidensjö North, over OPGW current differential scheme


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Sidensjö North 130kV incoming grid transformer circuit breaker fail protection shall trip the up-stream 130kV PoC circuit breaker at Moliden, over OPGW current differential scheme

Sidensjö North 130kV line circuit breaker fail protection shall trip the up-stream 130kV PoC circuit breaker at Moliden, over OPGW current differential scheme

Substation Emergency Stop – Activation of this scheme is to result in the following operation:

Sidensjö South Substation Emergency Stop shall trip the up-stream 130kV line circuit breaker at Sidensjö North, over OPGW current differential scheme

Sidensjö North Substation Emergency Stop shall trip the up-stream 130kV PoC circuit breaker at Moliden, over OPGW current differential scheme

Fault ride through requirements – It should be noted that the ability for the wind farm to continue generating during faults on the utility system is a requirement for this project. The HV system shall be required to have the functionality of this fault ride through requirement and that these protective functions can be placed into service.

It shall be the Contractors responsibility to develop an overhead line protection scheme that allows for faults on the line between Sidensjö North and Sidensjö South to be cleared by isolation of the North to South overhead line without tripping open the over head line fromSidensjö North to the Grid substation. It is intended that the overhead lines shall have a differential scheme as their primary protection with distance/over current Instantaneous/IDMT as the secondary or back up protection scheme.

The signalling to the Grid substation and between wind farm substations shall be over the OPGW single mode fibre optic cable system. This fibre communications system shall be arranged by the Contractor to immediately signal/trip the primary differential protection scheme operation and to act as a trip acceleration scheme on the back up distance/over current and earth fault protection to be employed on all overhead lines.

Note. The Moliden Grid substation the last 200m of the route shall be via underground cable. Similarly at the Sidensjö South substation the last 50m shall be also by buried underground cable

The WF shall be equipped with the facility to trip out the Grid Companies HV feeder CB located at Moliden. This shall be through automatic protection relays. In addition a manual facility shall be built into Sidensjö North to trip out the Moliden feeder CB. Similarly a manual facility shall be built into Sidensjö South to trip out the Sidensjö North line CB

12.14.4 Protective Functions

All relays shall be numerical multi-function types offering a range of protection functions andcommunications.

The first main (primary) 130 kV feeder protection shall use (87L) numerical current differential over direct fibre optics. The relay should also offer thermal replica overload and delayed auto-reclose to clear single phase earth faults.

The second main (backup) 130kV feeder protection shall use numerical distance (21) protection. This shall detect phase and earth faults and shall use directional earth fault (67N) and neutral voltage displacement (59N). The distance protection will initiate the auto-reclose function of the first main protection should a single phase earth fault be detected. The relay shall include blocking, permissive over-reach, permissive under-reach and acceleration schemes.


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The transformer unit protection should use a second harmonically restrained biased differential relay which includes HV over voltage, HV over fluxing volts per hertz and thermal overload.

All 33 and 130kV circuit breakers will employ over current (51/50) and earth fault protection (51N/50N) as backup protection. This relay shall also include a thermal function suitable for cables, transformer, shunt reactors, shunt capacitor or overhead line circuits.

All IDMT (51) protective functions shall have the facility for being able to be user selected from a comprehensive set of appropriate time/current curves inclusive of IEC extremely, very, standard, definite time or instantaneous time/current curves, as a minimum.

The time delay parameter, associated with the re-close (79V) functions, shall be variable from 0 to 900 seconds. This function shall operate as a single shot and lock-out re-close with a user defined reclaim time.

The re-close (79V) function shall incorporate a voltage blocking feature to ensure re-closure can only occur while the associated, grid side, busbar or incoming grid connection is live.

Each Re-close (79V) function shall have the facility to be switched IN or OUT.

The Interface Protection functions shall measure three phase voltage and use positive sequence voltage to measure frequency and rate of change of frequency. Under/over voltage (27, 59) protective functions shall be 3 phase and designed for Phase to Neutral monitoring. The setting shall be have adjustable Definite Time and pickup setting. The phase under and over voltage elements shall operate if any phase exceeds the setting for the set time delay, Under/over frequency (81/L, 81/H) protective functions shall be 3 phase monitoring. Time curve shall be variable Definite Time with an instantaneous setting.

The Loss of Mains (LOM) protective function shall be 3 phase and based on the rate of change of frequency principle. Time curve shall have a Definite Time delay on pickup with variable pickup setting of at least 0.1 to 5.0 Hz/s.

The 33kV connections on the Grid Transformers shall be monitored by a neutral displacement relay (59N) that shall be active when the 33kV CB is open. In the event of the detection of a phase to earth fault in these connections/transformer winding then it shall not be possible to close the 33kV grid connection CB and the associated 130kV CB shall be tripped opened.

33kV system earth fault protection setting range and CT ratios must be suitable for detection of the expected range of 33kV earth faults which are limited by the earth transformer and NER unit to a maximum of approximately 100A when the 33kV reactor is disconnected. This may increase by a max 150% (approximately 150A) when the 33kV reactor is connected, depending upon the design of reactor to be employed.

The earth fault current shall be limited to prevent damage to equipment, risk of electrocution by direct or indirect step and touch potentials while ensuring this limitation does not create excessive voltage rises in the 33kV system. The Contractor shall be responsible for the design of this system and shall co-ordinate these parameters.

Upon operation of the auxiliary transformer protective device Discharge Gas, Pressure and 2 off Temperature set points (DGPT2 or equivalent), the associated 33kV circuit breakers shall be tripped and locked out. The auxiliary transformer shall also be provided with Restricted Earth Fault protection tripping out the required 33kV circuit breakers if activated.

An Emergency Stop (5E) push button shall be required:

Adjacent to the entrance/exit door of the 33kV Switch room Within the Sub-station turbine SCADA room


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Within the Sub-station Control room External to the substation building within the HV compound

The buttons will require two sets of contacts; they shall be red in colour with a large engraved label indicating ‘Emergency Stop’ and they shall be of a type that prevents accidental operation with a protective collar. Activation of these Emergency Stop push buttons shall trip out the Incoming wind farm MV CB.

It should be noted that the precise tripping sequence of the manual EM Stop push buttons has not been agreed via any formalized risk analysis. Therefore the Contractor may be requested to simply parallel the EM Stops to trip the HV CB and the MV CB’s in the event of any EM Stop being pressed. This EM Stop tripping sequence shall be agreed during the Contract phase. Circuit breaker SF6 Gas Pressure Alarm (63GPA) & Trip (63GP) sensors are to be independently set.

All trip function and indications shall be:

Manual resetting for Lock-out operation Self resetting for Re-close operation

12.14.5 Protection Relay Panel

All protective relays shall be located within a suitably protected, freestanding, front access (including access for wiring and inspection), steel protection control panel, having a lockable, and transparent, front access door physically restricting access to the various device front panels. Fitted with lifting eyes. All protection, control and monitoring equipment is to be flush front panel mounted. Approximate dimensions to be 800mm x 600mm x 2000mm high. Colour to match switchgear & co-ordinated with other panels. Each panel is to be fitted with:

230V AC, 50Hz, internal panel inspection lamp with door operated On/Off Switch 230V AC, 50Hz power socket Trafolite labels indicating the name/function of each relay or device

The above equipment is to be located within the substation Control room.

A 95mm² Green/Yellow earth conductor is to be installed from this panel to the Sub-station Main earth bar. In addition, all cable glands/shoes will have their earth tag bolted to the panel’s cable gland plate and all tags interconnected with earth conductor, then connected to a suitable earth terminal. All main protection relays should be wired through test sockets, and a preference for ABB RTXP 24 or RXTP 18 is expressed by the utility for compatibility with test equipment. The Contractor shall supply three of each type of test plug for each type of test socket used. All analogue signals and a one trip output shall be wired through the test socket to assist with testing.

Note:At both Sidensjö North and South substations dedicated Overhead line protection panels shall be required. At the North substation the Moliden to Sidensjö North panel shall be free-issue supplied by the Grid Company for installation by the Contractor. The Contractor must therefore correspond, liaise and co-ordinate with the Grid Company to ensure compliance with the Grid Company requirements.

12.14.6 Protection Interface to Turbines

This section is no longer applicable


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12.14.7 Protection Interfaces to Grid

12.14.7.1 Sidensjö North

The Contractor shall be responsible for interfacing direct to the Grid Company to provide for a dedicated overhead line protection and tripping scheme. These dedicated protection and interface panels shall be located next to the Grid Company Communications panels which shall be located as standalone units and physically spaced away from all other wind farm substation control/communications/protection panels in a clearly labelled and sectioned off area. This shall be done to prevent accidental operation of wind farm panels by the Grid Companypersonnel whom will attend site to maintain and test the dedicated Grid protection and communication panels

The protection panel shall house the Primary Differential protection relays and the secondary distance/over current and earth fault relays. The Contractor shall use a pair of dedicated fibres in the OPGW system for this interface to achieve a fast protection clearance time.

All OPGW fibre cables, break out boxes and communication interfaces with this system shall be part on the Contractors scope of supply after the Overhead line contractor has installed the fibre cable, form the OPGW, within the interface patch panel located within the substation.

The Grid Company has indicated a preference for ABB protection relays for the first main feeder and choice of Group Schneider or Alstom for the backup protection relays, applied to the overhead line between Sidensjö North substation and UT171 Moliden. The Contractor shall therefore correspond, liaise and agree selection of protective relay device make and model for the Grid Company to purchase for installation at both end of this overhead line section. It is the intension of the Grid Company to install and own the protection panels at Moliden and free-issue the protection panel for Sidensjö North for the Contractor to install, test and commission. Therefore the Contractor shall supply full information to Grid to allow this work to be undertaken to a planned and agreed programme.

The 130kV overhead line protection shall use a numerical current differential relay as primary line protection. The second backup line relay shall be a numerical distance relay.

This feeder differential relay shall use separate current inputs for each set of three phase current transformers. A two ended scheme protection the overhead line from Sidensjo North to Moliden is envisaged to use a relay type which accepting two sets of current transformers inputs. The shorter overhead line from the North and South substations is envisaged to use one set of current transformers at the North end and two sets of current transformers at the South end. The Contractor shall forward a list of ordering codes for each relay type to the Employer.

Parallel connection of current transformers into one relay analogue input is not permitted.

The current differential relays should be connected with a supervised and switched dual redundant fibre optic signalling to allow it to be used for the permissive signalling for the distance scheme.

In addition the Contractor shall draw up detailed CT specifications and supply these to the Grid Company so that they can supply and fit in the new CB feeder to be installed at Moliden substation by the Grid Company.

Note:It may be that the Grid Company selects a second manufacturer for the backup protection. The Contractor shall therefore co-ordinate with Grid on this item and supply relays from a second agreed supplier if required.


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At Sidensjö North the Grid Company shall be provided with space to install their own communications panel in a space clearly segregated to ensure Grid personnel cannot accidentally access the wrong panels. The Grid Company shall supply and fit their own panels and the Contractor shall make full provision for these panels to allow them to be installed powered up and commissioned. The Contractor shall ensure the agreed equipment status signals are all routed to the Grid panels in the required hard wired or fibre optic formats. All communications for these functions shall be over the normal SCADA systems and connections

The Grid Company shall require the facility to fast trip the 33kV feeders to the turbine arrays and to Trip the HV CB’s. This fast trip scheme shall use dedicated fibres in the overhead lineOPGW system. The Contractor shall therefore provide a dedicated protection panel and interface into the WF Protection system to achieve this fast trip requirement at SidensjöNorth. This dedicated protection panel, which may be the same panel as the dedicated overhead line electrical protection panel detailed above, shall be located next to the Grid Communications panel. Once installed and commissioned the Grid Company shall take over ownership of this panel. The Contractor shall therefore agree its design and functionality and tripping times with the Grid Company prior to commencing manufacture.

12.14.7.2 Sidensjö South

At Sidensjö South the Grid Company shall be provided with space to install their own communications panel in a space clearly segregated to ensure Grid personnel cannot accidentally access the wrong panels. The Grid Company shall supply and fit their own panels and the Contractor shall make full provision for these panels to allow them to be installed powered up and commissioned. The Contractor shall ensure the agreed equipment status signals are all routed to the Grid panels in the required hard wired or fibre optic formats. All communications for these functions shall be over the normal SCADA systems and connections.

The Grid Company shall require the facility to fast trip the 33kV feeders to the turbine arraysand to Trip the HV CB’s. This fast trip scheme shall use dedicated fibres in the overhead line OPGW system. The Contractor shall therefore provide a dedicated protection panel and interface into the WF Protection system to achieve this fast trip requirement at SidensjöSouth. This dedicated protection panel shall be located next to the Grid Communications panel. Once installed and commissioned the Grid Company shall take over ownership of thesepanels. The Contractor shall therefore agree its design and functionality and tripping times with the Grid Company prior to commencing manufacture.

Note:The Overhead line between the Sidensjö North and South substations will require the same level of protection as the line between Sidensjö North and the Moliden Grid station. However the WF development company shall own and operate/maintain this protection scheme. Therefore the over head line protection relays North to South must not be in the same panels as those protecting the North to Moliden substations. These North to South protection units shall therefore be located in panels beside the WF substation protection panels to ensure Grid personnel do not accidentally operate these panels

12.14.8 Protection Tripping PhIlosophy and Tripping Report

The Contractor shall be responsible for developing a protection tripping philosophy and for achieving integration and approval by the Grid Company. This shall include inputting the existing Grid Companies protection settings and tripping philosophy at the existing substation and settings by the Grid Company for the new Sidensjö connection CB. The Contractor shall be responsible for the co-ordination with the Grid to ensure the settings at both ends of the line are approved by the Grid Company. The Contractor shall then issue a formal version to Grid and witness the Grid Company inputting these settings into the Moliden protection panels and any commissioning / testing of these units.


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12.14.9 Acceleration of Back-Up Protection

The Contractor shall design into the back up protection system the facility to use the dedicated protection and tripping fibres to accelerate remote tripping of the far end overhead line CB in the event of the back up over head line protection unit operating.

This shall be agreed with the Grid Company for implementation on the Sidensjö North to Moliden overhead line

12.14.10 Grid Transformer On Load Tap Changer Interface and Control

The substation(s) shall contain the On Load Tape Changer (OLTC) control using automatic voltage control AVC relays for each of the Grid Transformers. These shall be supplied by the Contractor in dedicated sections of the Protection and Control panels clearly indicating the panel section purpose. These shall operate the Automatic Voltage Control (AVC) scheme needed to maintain the associated 33kV busbars voltage at the nominal level

The AVC shall have a possibility to compensate for reactive power flow that can be switched on at a later date. At the time of commissioning and initial operation the AVC shall operate in Voltage Control mode, the unit shall have Voltage control Enable / Disable switch.

The setting range for the voltage set-point should be within 90 – 110 % of the rated voltage. Resolution and dead-band shall be adapted to the tap-changer that is provided with the transformer. Time delay between steps shall be settable between 15 and 120 seconds. The automatics shall be operated/indicated Auto/Manual locally and remote.

The over current protection for the tap-changer shall block both manual and automatic operation of the tap-changer. Over and under voltage blocking shall only block the AVC function.

The AVC shall measure the voltage in actual point of regulation. The voltage shall be monitored for high respective low voltage. The high and low set-points shall be adjustable. The AVC operation shall be blocked when the voltage is outside the set-points. It shall be possible to signal the threshold values (when passed) in the event recorder and to dispatch centre.

The AVC function shall be blocked if the voltage measuring is disconnected, i.e. based on position indication from the circuit-breaker or disconnector that can disconnect the voltage transformer.

The tap-changer operation shall be carried out as pulses with adjustable time. The time between these pulses shall also be adjustable between inverse or constant time. The use of inverse time requires the current through the tap-changer to be indicated.

In order for the AVC not to operate continuously, there shall be a settable dead-band.

Technical requirements – the following basic parameters are expected, it shall be the Contractors responsibility to co-ordinate these with the Transformer supplier to ensure a safe working system is delivered

Range of adjustment 90-110% of Un, resolution 1% of Un

Allowed deviation (dead-band) +0.5% to +-3 % of Un resolution 1% of Un

Time characteristics constant time and inverted time


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Operating time (constant) 15,30,60,90,120 s

Regulation pulse One pulse after each delay period or continuous at permanent deviation. The pulse length shall be settable between 1-10 seconds.

Under voltage blocking 70-110% of Un Step-less

Excess voltage blocking 90-130% of Un Step-less

The Contractor shall be responsible for co-ordinating with the Grid Transformer supplier and shall ensure the correct CTs, VTs are available and the correct control signals are transmitted to the OLTC position controller mechanism mounted on the actual Grid Transformer(s).

The Contractor supplied control panel in the substation shall be equipment with panel mounted indicators to provide full visual status feed back of the tap changer operation and position, as well as the required manual controls such as raise/ lower voltage and Tap changer operational logic check. It shall also have a local - Manual / Auto - selector switch to allow for manual control of the tap changer from the substation mounted panel and tap changer lock out. This switch shall be lockable in both positions.


12.14.11 Drawing Specification

The following minimum set of protection drawings are to be submitted. All drawings are to be drafted in accordance with Swedish standards SS-EN 61082.

Electronic format of drawings to be agreed with The Employer.

The basic requirements for the Employer to receive drawings shall be that all drawings submitted to the Employer shall be complete with drawing register, they shall be individual files, files and renditions to have identical name (only file extensions to be different), file name to include drawing number and revision, must not contain external references (X-refs), drawings to be issued in Zip file (if file size exceeds 1 MB)

a) Detailed AC schematic drawings and Block Cable Diagramsb) Detailed DC schematic drawingsc) Detailed Alarm Signal drawing.d) Detailed wiring drawingse) Multi-core cable termination drawingsf) Multi-core cable schedulesg) Protective relay layout drawingsh) Protective relay panel dimensional drawingsi) Documentation for telecommunications and fibre optic installationsj) 1 off laminated A1 framed ‘As Built’ Protection Scheme drawingk) Complete set of all ‘As Built’ laminated drawings laminated

12.15. Switchgear Local/Remote Control

12.15.1 General

The Contractor shall be responsible for developing an operational control scheme for the substation HV & 33kV switchgear.


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The design shall be that the operators shall not operate live switchgear while standing at the live substation switchgear panel to be operated.

All operations of live HV and 33kV switchgear shall be performed from the Control room by the use of dedicated MIMIC control panels. Only when the circuit breaker has been selected remotely into the open position, shall the operator attend the switchgear to put the disconnector into the open position and apply the earth.

Therefore the HV and 33kV switchgear shall be provided with a lockable ‘Local / Remote’ switch. The Contractor shall supply and apply the padlocks. Under normal operation with the system live the Local / Remote switch shall be locked with padlocks in the Remote position.

In the Remote position the circuit breaker shall not be operate electrically from the integral switchgear controls on the actual switchgear. In the Local position it shall only be possible to electrically operate the circuit breakers from the switchgear panel. The protection trip shall remain active at all times

In this specification the ‘Local’ position is defined as the operator standing at the switchgear to be switched and the ‘Remote’ position is defined as the Control room for operation from the MIMIC control panel.

The Contractor shall supply the substation complete with a HV and 33kV switchgear control / MIMIC panel. This control / MIMIC shall display the status of the main components (CB’s, disconnectors and earth switches) of the HV and 33kV system via lamps, or LEDs, illuminated to show the status of the represented equipment, a lamp test button shall be provided.

The required Trip/Neutral/Open CB switches shall be mounted either on the substation control panel/MIMIC panel or on a dedicated switchgear control panel, if mounted on a separate dedicated panel this must be mounted in the Protection / Control room such that it has full view of the MIMIC.

The facility for the Grid Company to trip the HV Grid CB’s and the 33kV substation turbine array feeders from their remote control system at Moliden Grid station shall be required. Therefore the Contractor shall build in this feature into the substations

Note:The Emergency trip functions to the CB’s must work even when the CB is in Local mode. However the exception shall be that if the CB has to be Closed to apply the earth to the circuit it feeds / earths – in this mode it must not trip open once it has been manually applied to earth up the required circuit. If this trip function is present in the original CB equipment the Contractor must provide the method of defeating this trip and suitably demonstrate to the Employer this defeat mechanism before purchasing and installing the equipment

12.16. Monitoring & Control System

12.16.1 HV Monitoring & Indications

The contractor shall provide suitable HV Grid connections indication as to allow the wind farm personnel to be able to select the voltages they wish to observe i.e. phase to earth or phase to phase. This voltage shall be displayed on a suitable panel within the substation control and protection room. This selection shall also be made available to remote observation via the SCADA system.


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12.16.2 33kV Monitoring & Indications

Description

Incoming Feeder From

Grid Transformer

Wind farm Feeder

Wind farm RPC Feeder& Harmonic

Feeder

Earthing Transformer

Selectable 3 Phase Ammeter

Required Required Required Not Required

Selectable 3 Phase and Phase to Neutral

VoltmeterRequired Not Required Not Required Not Required

Healthy Trip Indication Required Required Required Required

Circuit Breaker SF6 Gas Pressure (if applicable)

Required Required Required Required

Busbar SF6 Gas Pressure Alarm (if applicable)


Circuit Breaker Status Mechanical Indication


Isolation Switch Status Mechanical Indication


Earth Switch Status Mechanical Indication


The bus bar earthing switch open and close status shall be brought out for use on the HMI and the MIMIC. Should the Contractors design require the bus bar earthing section to contain gas pressurised chambers these shall be monitored and brought out for alarms.

12.16.3 General

Equipment shall fulfil interference class (see EN 60255-6) of the corresponding part of the plant where it is placed. The following monitoring & control system shall be provided.

12.16.4 Monitoring & Control

A mimic diagram representing the substation single line diagram, that shall represent all Substation HV and 33kV equipment, shall be mounted on the front of the Monitoring and Control panel to form a system MIMIC.

Where, each circuit breaker shall be represented by an illuminated lamp/LED for status indication, all HV and 33kV CBs, disconnect switches and earth switches shall show their status indication. The panel shall include the facility to test lamps/LED’s are working correctly via a lamp test switch.

Each of the substations shall be complete with its own HV & 33kV monitoring system. Thisshall include for a number of separate Power Quality Meters (PQM). These shall be arranged as follows:


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Sidensjö North Wind Farm Substation

1 PQM is to be connected to monitor the HV system connections of the Grid transformer (T1-N)

1 PQM is to be connected to monitor the 33kV system connections on the 33kV side of the Grid transformer (MVCB01)

2 PQM are to be connected to monitor the 33kV system connection to each of the wind farm feeder circuit breakers. 1 off in each feeder (MVCB02 & MVCB03)

1 PQM is to be connected to monitor the 33kV system connection on the 33kV feeder to the reactor (MVCB05)

1 PQM is to be connected to monitor the 33kV system connection on the 33kV feeder to the Harmonic Filter (MVCB04)

Sidensjö South Wind Farm Substation

2 PQM are to be connected to monitor the HV system connections. 1 off in each Grid transformer (T1-S and T2-S)

2 PQM is to be connected to monitor the 33kV system connections on the 33kV side of each Grid transformer. 1 off in each feeder (MVCB11 and MVCB21)

5 PQM(s) are to be connected to monitor the 33kV system connection to each of the wind farm feeder circuit breakers. 1 off in each feeder (MVCB16, MVCB15, MVCB22, MVCB23 and MVCB 24).

2 PQM are to be connected to monitor the 33kV system connection(s) on the 33kV feeders to each reactor feeder (MVCB13 and MVCB26)

2 PQM are to be connected to monitor the 33kV system connection(s) on the 33kV feeder to each Harmonic Filter (MVCB14 and MVCB25)

Moliden Substation

1 PQM is to be supplied and connected to monitor the HV system connection at the Moliden PoC

All substation digital monitoring devices shall be flush front panel mounted. The monitoring & control panel shall be of the same specification as the protection relay panel.

Power quality meters shall be provided as per the Sidensjö Wind Farm Substation SCADA and Communications Technical Specification 01986-010598.

The requirements for the interconnection of all devices and equipment is detailed on the employer supplied documents; SCADA & Communications Block Diagram 01986D4501 and SCADA Fibre Connections Diagram 01986D4503.

All Power Quality Meters shall display:

3 phase current (Each phase individually) 3-phase Total Harmonic Distortion voltage & Current as % of Fundamental Voltage – selectable phase to phase and phase to neutral Average 3-phase kW, kVA, kVAr (four quadrant reading) Average 3-Phase power factor (four quadrant reading) HV or 33kV (as applicable) circuit breaker – electrical trip/close HV or 33kV (as applicable) circuit breaker – status

Voltage and current indications shall also be displayed via a set of analogue voltmeter and ammeters mounted on the Protection and Control panels.


http://ecm1/livelink/livelink.exe?func=ll&objId=21124283&objaction=download&vernum=14


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All electrical measurements are to be true 1 second average RMS values that are updated at least once every 1 second.

Inputs to the protection relay for switchgear auxiliary contacts etc, including VT’s and CT’s are to be wired from terminal rails located on the 33kV switchgear, or dedicated terminal boxes in the case of HV equipment to a set of dedicated terminal rails located in the protection/control panels.

12.16.5 Panel Labeling

The labelling on all protection, monitoring and control & SCADA panels shall be engraved trafolite in English & Swedish.

The labels shall be mechanically fixed to the panels using either rivets or screws.

12.16.6 Wind Farm Trip/Alarm Supervision

All alarms and trip notifications shall be sent to the WF SCADA system that shall act as the WF Trip / Alarm display unit

Each trip or alarm must be easily identifiable from the SCADA system and the cause of this trip or alarm indicated e.g. – emergency stop, circuit over current etc.

12.16.7 SCADA/RTU Remote Monitoring & Control System

Whenever possible, all protection, monitoring and control devices shall be fitted with a Serial Data Communication facility for data exported to the wind farm SCADA system via a fibre optic Modbus TCP connection. Data from the PQM(s) shall be exported to the wind farm SCADA system via a fibre optic Modbus TCP connection.

12.16.8 Environmental Temperature Monitoring and Alarm System

The Contractor shall supply and install an Environmental temperature monitoring system which shall be part of the HMI. This system shall be required to monitor the air temperature in each room of the substation containing electrical equipment, an air temperature reading from the vicinity of the HV substation equipment and a ground temperature reading from the transformer foundation block.

All sensors shall be suitable for use over a range of a minimum of 200C beyond the extreme temperature range detailed for the wind farm site location. They shall be replaceable with the system and the site live and generating.

The system shall record the temperatures at 15 minute intervals and store this data for a minimum of 12 months. The unit shall be configured to provide inputs to the SCADA system that can be used to de-activate selected items of equipment should temperature reach its operational or working limits. In addition, the data shall be downloadable by either SCADA or via a laptop connection port.

12.17. Auxiliary Power System & Lighting

The auxiliary power system of the substation shall have the following basic data:

AC Voltage 400/230 VDC Voltage 110V DC via chargers and batteriesDC Voltage 48V and or 24V DC via DC/DC converters from 110V DC system if

required


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Note – The Primary DC system shall be 110V DC. The Contractor shall supply and install a 48V DC and/or 24V DC system to supply turbine panel supplies or other interface panels e.g. Grid Company panels if required in either substation. If there is no requirement for an individual 48 or 24V DC supply requirement then this does not need to be supplied and installed.

12.17.1 A.C. Supply General Information

The substation shall be equipped with an AC voltage system designed for the auxiliary power needs of the station regarding power, heating, lighting, UPS supplies and control units.

The Contractor shall be responsible for the dimensioning of the AC voltage system conductors so that the capacity is enough for the needs of the substation consumers.

The Contractor shall present calculations to validate the dimensioning and ratings of all equipment. Required power and secondary cables within the substation and compound, including laying and connection, shall be part of the scope.

12.17.2 A.C. Distribution Panels

One main LV distribution panel (VHC) intended for power, heating and lighting (indoor and outdoor) shall be located at a strategic place in each substation. It shall be dimensioned to support all the equipment in the substation and outdoor compound. A separate distribution panel in the control room, suitable for the SCADA equipment, will also be required.

The VHC shall be provided with a voltmeter 0-500 V, 50 Hz. The instrument shall be of quadratic type, 96x96 mm, with horizontal zero-position.

In the substation building the following minimum number of outlets shall be installed in addition to outlets required for permanent installed equipment:

Switch room (Sidensjö North)- 4 outlets 10A, 230V- 2 outlets 16 A, 400V type CEE 416-6

Switch room (Sidensjö South)- 4 outlets 10A, 230V- 3 outlets 16 A, 400V type CEE 416-6

SCADA room(s) or areas of room assigned to WF SCADA Turbine SCADA panels- Minimum of 4 Double Socket outlet ring main 32A, 230V- 1 outlet 25A 230V with type C fuse for the - 1 outlet 16 A, 400V type CEE 416-6- Siemens Server (25A is required for the inrush current. <10A continuous)

Control room- 4 outlets 10 A, 230 V- 1 outlet 16 A, 400V type CEE 416-6- Additional outlets inside each cubicle

Accommodation (office) rooms- 4 outlets 10A, 230 V

Toilet room- Hot water heater 10A, 230 V

Kitchen/mess (meeting area/canteen) room- Hot water heater 10A, 230 V- 4 outlets 10Amp, 230V


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- 2 outlet 16Amp, 230V

Battery room - No sockets to be installed in the battery rooms

Storeroom- 6 outlet 10A, 230 V- 1 outlet 16 A, 400V type CEE 416-6

Workshop- 4 outlets 10A, 230V- 1 outlets 16 A, 400V type CEE 416-6

Entrance Hall- 4 outlets 10A, 230V

External Building- 2 outlets 10A, 230V

Technical Facilities- 2 outlets 10A, 230V

The Contractor shall refer to the following NV documents. The Room Schedule (01986-007191) details the room sizes agreed with the end client and so the Contractor shall comply with these detailed room requirements. The building arrangements shown in the drawing (01986D2233) are for ‘indicative only’ and were developed to give the end client a idea of what they would eventually be provided with at the Sidensjö North and South substation buildings and the Contractor shall revise these to suit the particular project arrangements at each substation:

NV Document ECM 01986-007191 - Sidensjö EPC Specification Part IX - Service & Maintenance Provisions

NV Drawing 01986D2233 – Sidensjö Wind Farm Sub-Station Indicative Room Layout

The Contractor shall be required to review equipment locations and add outlets as required.

Outside of the substation building, two 16 Amp 400V type CEE 416-6 connectors are to be installed and four motor (vehicle) heating outlets of 10 Amp, 230 V shall also be installed at the outside parking lot at the substation.

A 5-poled 63 Amp 400VAC inlet socket type CEE 463-6 shall be installed outside of each substation building for the purpose of connecting a temporary diesel generator to the VHC board to provide building auxiliary supplies, see 01986D4304.

Enclosed distribution boards shall, if indoors, be designed according to protection degree IP20 and if outdoors made of non-corrosive construction or similar with a protection degree IP54 and be equipped with ventilation flanges with internal mesh for prevention of access by insects etc.

Central distribution boards shall be delivered complete with inner connections, fuse automatics alternatively fuses, fuse base, conducting parts, plug caps, connection blocks, covering plates and eventual inlets. Group registers (circuit labels) of plastic shall be attached to the inside of enclosing covers/doors.

The Employee preference is that the central distribution board shall be provided with MCB’s. These MCB’s shall be of a type approved for the use as disconnectors. They shall be supplied with facility to be locked in the OFF or circuit Disconnected position. 3 off locking devices


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shall be supplied in each substation for each individual different MCB rating used in each substation

The Contractor may offer a central distribution board provided with fuses. In this case the following minimum requirement shall be provided. A pad lockable guard bar to prevent unauthorized fuse replacement. Fuse holder for maximum 63 A rated current can be equipped with normal fuses while fuse holder for larger rated current can be equipped for knife-fuses. Fuse groups shall be constructed so changing cartridge fuses can be done with no voltage present at accessible parts and without risk. Lines to the fuse apparatus shall be short-circuit proof constructed and fitted. Three-pole groups shall be equipped with breaker and connected to connection block.

Each group shall be equipped with a neutral connection block. For the compartments equipped with knife-fuse each group shall be provided with a fuse load breaker. For other compartments it has to be a main load breaker. Outlet groups in these compartments are protected with an earth fault breaker.

In the central power distribution boards there shall be reserve feeder groups to a number of at least 30%. Holders for spare fuses, requisite group diagrams, signs and tools for changing knife-fuse are to be included.

The demands on earth fault detection circuit breakers in electrical safety regulations shall be followed. Triggering of an earth fault breaker shall be indicated via signal contact to the local fault monitoring signal system of the station.

All above circuit breakers/fuse blocks shall include auxiliary contacts connected in series to provide a general failure alarm via SCADA. Each single breaker/fuse shall be shown in the alarm list on the HMI.

12.17.3 Manual Change-Over Function and External LV Standby Power Connection Point

At both Sidensjö North and Sidensjö South the main central distribution board (VHC) shall be provided with equipment for manual change-over between two off separate incoming power supply feeding routes. Normally the feed is from the main transformer auxiliary 0.42 kV winding on either the Grid transformer or the Neutral earthing transformer via an auto change over switch.

In addition the LV system shall be supplied complete with the facility to connect up a mobile diesel driven generator that shall be rated not less than 63Amps.

The Contractor shall make full provision for this alternative incoming LV supply, which shall form the temporary alternative supply. It shall be connected to the substation LV system by the manual switching in of the mobile generator LV connections.

The Contractor shall make full provision for the supply and installation of an externally mounted termination panel for connecting of the mobile diesel generator to the LV system.

This shall be an external lockable panel and shall be complete with a lockable integral isolator (isolator to be fault make, load break rated) and cabled to the substation LV distribution board (VHC) ready for use. The Svensk Energi report, ‘’Reservkraftaggregat’’, no 30439, shall be used.

The 2 off (two) LV supplies at the manual change over switch shall be securely electrically and mechanically interlocked against connection of more than one LV supply source to the VHC at the same time, this may be via a lockable changeover switch or by a unique interlock key and locks fitted in each supply point, Contractor to advise method. It shall be clearly visible which inlet is supplying the Substation main VHC via the use of lights and labels.


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12.17.4 Auto Change-Over Function Between Normal LV Power Supplies

Both the wind farm substations shall be supplied by 2 off permanent LV sources of power. Both of these LV sources shall be permanently cabled to an Auto change over switch. Auto-changer over process shall be completed using motorized CB’s and shall include electrical and mechanical interlocking.

The Contractor shall pay attention to the requirement that it shall not be possible to back feed one supply to the LV terminals of the other. In addition it shall be possible to manually over ride the auto-change over scheme and lock the system into one selected normal LV supply configuration.

NoteThe Normal power supply for Sidensjö North shall be the 420V winding on the 130/33kV Grid transformer. The reserve LV supply shall be from the Neutral earthing transformer

At Sidensjö South these 2 off LV supplies shall be the 420V Auxiliary winding of the 130/33kV Grid transformers. Both of these LV sources shall be permanently cabled to an Auto change over switch. The Normal power supply for Sidensjö South shall be the 420V winding on the 130/33kV Grid transformer T1-S with T2-S being the reserve supply feed to the auto change over.

Should the system automatically switch or be manually (over-ride) switched from its normal supply to the reserve supply this shall be signalled out to the WF SCADA system as an alarm

12.17.5 Grid Transformer LV Supply

Grid transformer LV control system shall be designed to be supplied with 400VAC from the substation VHC switch board. The Contractor shall install this cable.

12.17.6 Substation Lighting

12.17.6.1 Outdoor Lighting

For lighting of access road/parking bays and all substation access doors, outdoor switchgear and other outdoor mounted equipment, light columns 3m high must be provided with halogen lights that give sufficient light for normal operational and maintenance conditions and to ensure outdoor equipment signs and labels are to be readable.

The outdoor lighting shall be controlled via a light sensor and time relay with time adjustment. At night (between 22.00 and 06.00) lighting to be activated manually via push button for 2 hours operation, otherwise via a PIR. The switch yard lighting to be activated manually from the substation building entrance.

12.17.6.2 Indoor Lighting

All indoor lighting shall be complete with fluorescent lamp armatures, which are lit by impulse push buttons with signal lamps at the entrance doors. The light intensity shall be at least 500 lux across all working surfaces. General lighting cabinets with control equipment shall be provided with cabinet illumination that is lit automatically when the cabinet doors are opened. Sealed switchgear, control and protection cabinets shall be provided with illumination that is lit together with the ordinary illumination but via a breaker placed at the switchgear.


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12.17.6.3 Emergency Lighting

At each outer door there shall be a rechargeable portable hand lamp. The centre of the beam of light shall be placed at maximum 50 cm above the floor level. The lamp shall be constructed so that only low lights are automatically lit at voltage interruptions

12.18. D.C. System

12.18.1 General

The substation shall be provided with a complete D.C. system comprising battery charging rectifiers, 110V batteries, D.C. distribution and monitoring. A primary and secondary 100% rated 110V DC system shall be provided to interface with dual CB trip circuits.

The battery room shall be mechanically ventilated. Failure of the ventilation system shall be detected via an alarm to the SCADA system and boost charging shall be prevented during this event.

The delivery shall include 110 V supply to control equipment and, in case of equipment requiring 48 or 24 V. The D.C. system shall be high resistance grounded.

The contractor is responsible to design the DC system so it has enough capacity for the complete load of the substation during periods when the substation is at minimum temperature. The contractor shall hand over and present calculations to validate the dimensioning. The design calculations and load profile shall be presented according to appendix 2 in TR2-09-1. Designing interruption time with all, in the system included, loads in operation are 12 hours. The contractor shall state the recharging time after 12 hours interruption.

The D.C. system shall include the systems and components that are required for power supply of control equipment, protections, telecommunication equipment and operating devices.

The principle layout of D.C. systems is shown in drawings in TR2-09-1.

All necessary maintenance equipment shall be provided in a lockable cabinet in the battery room including, but not limited to, glasses, gloves and apron.

An eye-shower station shall also be provided containing eye-shower bottles with content suitable for 15 minutes of eye showering.

12.18.2 D.C. System Monitoring

D.C. systems for 110V shall be provided with voltage (over and under), insulation and battery circuit monitoring. The monitoring may be integrated in rectifiers.

Monitoring of 48V or 24V systems fed via DC/DC converters shall have separately arrangedvoltage and insulation monitoring.

Each individual fuse group/MCB in the distribution panel shall be provided with a zero voltage monitoring that signals at voltage drops. Each single breaker/fuse shall be shown in the alarm list on the HMI. Indication shall remain at the HMI until each breaker has been reclosed or new fuse installed. See further in KATS 9.4.

Alarms shall be given, with the following delays:

Over voltage 0 – 10 s


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Under voltage 0 – 30 mEarth fault 0 – 10 sBattery circuit fault instantaneousTripped fuse/MCB instantaneous

The function value for earth fault monitoring shall be settable between 100 kΩ and 1 MΩ.

Note:-All DC and AC UPS systems shall be monitored by the WF SCADA system, this communications interface shall be by a Ethernet connection between any DC and AC UPS systems installed by the Contractor and the SCADA system installed by the Contractor

12.18.3 Batteries

Requirements on batteries are stated in Technical Guideline KATS 9.2.

The station shall be equipped with a stationary 110 V lead-acid battery that is placed in a separate Battery room. The battery shall be of type free ventilated. Each battery shall handle the complete 110 V load of the system.

Batteries shall be dimensioned to support the complete basic load needs for the station during a 12 hours long interruption. At the end of this period it shall be possible to start one operating device at the same time as another operating device is in operation.

The design calculation and load profile shall be presented according to appendix 2 in TR2-09-1. Note that the temperature in the plant will decrease during the interruption time this shall be considered for calculation of required capacity.

Batteries shall be placed on insulated racks, durable to the electrolyte that is used. The racks shall be placed in vessels that can withstand the electrolyte. Vessels shall be able to hold the contents of at least two accumulator cells. The racks shall be designed so that the batteries shall be at a work-friendly height (minimum allowed height is 0.6 m).

Batteries cannot be placed over each other in more than two stories. Transparent vessels shall be turned so free sight between the plates is obtained. The delivery shall, except for batteries with electrolyte, per station comprise:

- Density meter- Drip stand- Filling funnel- Filling can- Grease for terminals- Lifting handle

Basic design data for the batteries;

Principle Manufacturing Standard: SS-EN 61951-1, IEC 60896Type of Batteries: Lead acidBattery Cell Life Expectancy: 10 yearsInput Voltage: 230V AC 50HzNominal Output Voltage: 110V DCLoad Profile: Standing Load + Trip & Close Operations

Battery float charge supplyStandby Duration: 12 Hours minimumAmp. Hour Rating: To be determined by supplierOver voltage Transient Surge Protection: RequiredMinimum General Features: Mains 'ON' 'OFF' switch and protection MCB

Mains 'ON' Lamp


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Output VoltmeterCharge AmmeterFuses as requiredAutomatic Load Test

Protection: Trip Circuit Monitoring Alarms: Battery Mounted Visual Indication

Low VoltsHigh VoltsEarth LeakageMains FailCharge Fail

SCADA Output Common AlarmPhysical Safety Protection: All voltages exceeding 50V AC or 120V ripple

free DC shall be provided with adequate basic protection in accordance with IEC 60364.

12.18.4 Charging Rectifier

Requirements on charging rectifier are stated in Technical guideline KATS 9.3.

12.18.5 Battery Panel, DC Panel

The battery distribution panel shall be placed in the Control room, in close proximity to the battery(s). The panel shall be constructed with separate boxes for plus and minus poles. It shall be designed of insulating material without earthed details and have transparent covers.

The battery distribution panel shall be equipped with an outlet for capacity testing and a fused connection for connection of testing equipments for earth faults.

The basic design of the DC system is shown in drawings in TR2-09-1.

Holders for spare fuses, required distribution diagrams, signs and tools for change of fuses shall be provided.

Enclosed panels shall indoors be designed with protection class IP20 and if outdoors be of non-corrosive design and of class IP54, equipped with ventilation flanges. Centrals for indoor use shall be delivered complete with internal connections, fuses, fuse sockets, plug covers, connection blocks, covering plates and eventual inlets. Distribution lists of plastic shall be attached on the inside of enclosing cover/door.

Incoming load switches in the main panels shall be provided with auxiliary contacts. Outgoing fuse groups shall have fuse monitoring.

The D.C. system shall be designed to ensure that redundancy is obtained in the relay protection hierarchy.

A 95mm2 Green/Yellow 6491X earth conductor is to be installed from this panel to the Sub-station Main earth bar. In addition all cable glands/shoes will have their earth tag bolted to the panel’s cable gland plate and all tags interconnected with earth conductor, then connected to a suitable earth terminal.

The labelling on all battery supply panels shall be engraved trafolite in English & Swedish.

The labels shall be mechanically fixed to the panels using either rivets or screws.

12.18.6 DC/DC Converters

The demands on DC/DC converters are stated in Technical Guideline KATS 9.6.2.


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The Contractor shall seek approval from THE EMPLOYER if DC voltages other than 110V are proposed to be used. If there is equipment in the station that requires 48 or 24 V DC supply, this shall be carried out with DC/DC converters fed from 110 V DC system.

For DC converters the following is applicable:

- The 48 or 24 V systems shall be fed via two (2) parallel-connected converters.- Each converter shall handle the complete load of the system.- Inlets and outlets shall be galvanic separated.- Converters shall be able to deliver sufficient short-circuit current to release a fuse of

normal-type or an automatic fuse. There shall be an inbuilt over voltage protective function that breaks the outbound voltage when the upper limit for stabilized outlet voltage is reached.

- Converters with a power below 500 W cannot be equipped with cooling fans.Larger converters shall be equipped with direct current monitoring the internal power subsystems/blocks, of the same type that is described for charging rectifiers above.

12.19. Secondary Wiring

The Contractor shall use the following specification for all secondary wiring;

Physical Safety Protection: Voltages exceeding 50V AC or 120Vripple free DC to be protected against directcontact.

Cable Access: Bottom EntryCable Glanding Plate: Mild Steel or Aluminium with

Pre-Drilled Pilot HolesGeneral Wiring: 1.5mm2 Stranded Copper with

Black PVC Insulation to BS 6231(‡)Current Transformer Wiring: 2.5mm2 Stranded Copper with Black PVC

Insulation to BS 6231(‡)Terminals: Minimum 4.0mm wide

Anti-Vibration Hooked BladesCable Ferrules: Critchley Z-Type Markers

White Body, Black Marking (‡)Control Terminal Connectors: Weidmüller Type RSF 1 (‡)Non-SCADA Alarm Terminal Connectors: Weidmüller Type RSF 1 (‡)Indication Terminal Connectors: Weidmüller Type RSF 1 (‡)CT Earth Isolation Terminal Connectors: Weidmüller Type SAKA 10(‡)CT Multi-core Terminal Connectors: Weidmüller Type SAKT 2 (‡)Outgoing SCADA Terminal Connectors: Weidmüller Type SAKR (‡)SCADA Control Isolation Terminal Connectors: Weidmüller Type SAKC 10 (‡)SCADA Alarm Isolation Terminal Connectors: Weidmüller Type SAKC 10 (‡)

(‡) Or equivalent

12.20. Equipment Signs, General Signs, Markings & Labeling

Required identification plates, cubicle number plates, operation plates and warning and operating instructions shall be included in the contract. Reference is made to SS 421 01 01, Chapter 7.8. All labels shall be in English and Swedish.

The Employer will provide a labelling system for all equipment to be installed at the Wind Farm. All signs on the switchgear, control panels, protection panels, etc. shall be attached with screw or riveted and all parts to be of corrosion resistant materials.


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The Contractor shall submit a proposal for sign formats for agreement with the Employer before installation.

All signs for outdoor use, including fixtures, shall be made of UV- resistant material.

Designation signs shall be provided with names in accordance with the agreed wind farm single line diagram once the selected drawing has been up graded to Construction drawing and accepted for use by the employer.

For the HV switchgear, designation and information signs shall be provided in accordance with TR1-16. Distribution panels and boards shall be provided with designation signs and lists of outgoing feeders.

12.21. Substation Earthing

12.21.1 Earthing, Earth Cables and Lightning Protection

The substation grounding grid design shall consist of the following minimum requirements to achieve the safety criteria determined in section 11.3:

130kV and 33kV fault current carrying earth conductors with the substation and compound area shall be sized based on a design fault level of 25kA for 0.5sec, allowing a minimum reduction factor value of 0.6 for ring/loop connected conductors. Subject to a minimum conductor size of 95mm² copper.

Touch & step safety criteria calculations shall be based on backup fault disconnection times of: 500ms seconds for 130kV earth faults; 2sec for 33kV earth faults.

Earth resistance value of the complete substation shall be in line with requirements of SS-EN 50522.

Earth grid to be buried at least 500mm below the finished surface level. Earth grid required at perimeter fence/building boundary shall include for a minimum

of 3 ground rings. An inner ground ring shall be located 1m inside of the fence-line perimeter and two outer ground rings shall be located 1m and 4m outside of the perimeter.

Vertical ground rods shall be located and connected to the outermost ground ring. The top of the rod shall be buried a minimum of 500mm below the finished surface. One rod shall be located at each corner and then others distributed between corners as required at spacing’s as detailed below (see 12.21.1.1 and 12.21.1.2). Locations, numbers, lengths and locations of horizontal earth conductor and vertical rods to be confirmed by Contractors earthing study and spacing’s reduced if required. The basic design for each substation shall be as detailed below and the Contractor shall confirm these spacing’s, depths and numbers or add earthing as required to achieve the required step, touch and overall substation earth resistance levels across the final substation areas required by his design.

All compound fence gates shall be mechanically restricted to open outwards. A layer of minimum 150mm deep clean crushed rock (not smooth rounded) 18mm to

25mm grade to be used throughout the compound area and up to 3m beyond the compound fence/building boundary. The crushed rock shall have a minimum resistivity of 2000 ohm.m.

The Contractor shall be responsible for the design, supply, delivery, installation, commissioning and test of the substation earth grid, earthing electrodes and all earth connectors and clamps.

The Contractor will design, supply, install, commission and test the lightning and earth protection system in accordance with the requirements of SS-EN 50522, IEC 60479-1, IEC 62305


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and ELSAK FS 2008:1-3 having regard to the results of a soil electrical resistivity survey he will undertake. Reference is also made to TR1-10.

The Contractor is to provide a drawing outlining the layout of the earth grid inside the substation and surrounding area and the size of the buried copper stranded conductors and connections to all equipment and earth bars. The drawing is to be provided four weeks before installation of the earthing system commences.

For practical installations, earthing of high voltage switchgear and complete substations shall follow “VAST- Vattenfall directions for earthing of substations and switchgear”, June 1987.

Lightning protection towers are to be installed to protect the outdoor 130kV switchgear and equipment together with the Grid Transformers.

Fences and gate posts shall be earthed according to EBR KJ 60:04. Minimum allowed earth bonding riser area is 35 mm2.

Earth wires shall be laid at a depth of minimum 500 mm. Below the earth wire, a bedding layer with a thickness of 50 mm shall be provided over the entire length of the trench/ditch used to install the earth conductor in. The material shall be free of rocks but otherwise according to Plant AMA 07 CEC.20.

Backfilling shall be carried out in accordance with Plant AMA 07 CEC.32.

In addition to the above earth grid, the Contractor shall also include for the installation of anadditional or extended earth electrode arrangement, if required, to achieve the target resistance. However the exact layout and length shall be decided between the Employer and the Contractor based on results of the earth resistance measurements made after the substation earth system has been completed.

All support structures and fences shall be connected to the earthing grid with Copper-conductors. Risers to supporting structures shall be connected by cable lugs/shoes with two holes. Pressure joints on supports, equipment, boxes etc. are not accepted as reliable earth connections between different parts. The earth connection shall in such cases be secured by a separate visible shunt or a bolted joint.

Apparatus boxes, marshalling boxes and similar shall connected to the earth grid via separate 25 mm2 conductors or by bolted connections to earthed structures. Doors shall be earthed to the box framework.

Earthing conductors of electrical equipment in buildings shall be connected to earth bars. Supports and frames of metal shall be connected to earth bars. The earth bars shall be connected to the substation earth grid at two completely separated points.

Reinforcement bars in the base plate of the switchgear building shall be bound together and if applicable be connected to building façade if made of metal.

Earthing for protection and interference mitigation in control equipment shall be designed to prevent fault currents in the high-voltage switchgear earth grid from passing through the control equipment. To ensure this, the earthing system of control rooms shall be connected to the external earth grid at one point only.

Earthing of electrical equipment within the sub-station building shall be designed so that induced currents are avoided. Especially the position of single-phase cables in cable entrances to the building shall be arranged so that the phases are not separated by any earthed metal parts.


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For earthing of air insulated high-voltage indoor equipment the earth conductors shall be arranged so that they will not be damaged during work in the equipment space. The earth conductors may be made of copper strips/bars or stranded copper conductors with sufficient area for the purpose. Where the earthing conductor’s are laid in the open they shall be well anchored to the floor or wall and be provided with mechanical protection to prevent damage in areas where work can be expected. Attention must be made to the installation of earth conductors to ensure this does not create a trip hazard where the earth cable is secured to floors and possibly also to provide the conductor with mechanical protection if it’s mounted where it could be damaged during normal/routine substation operation and maintenance.

In the case that there is a cable cellar under the switchgear compartment the earthing conductors should be placed on their own cable ladder or rack or similar in the cellar to ensure the earthing system is visible and will not be damaged by cable installation work. All ladder rack and risers etc. shall be cross bonded and bonded to earth.

Each separate indoor room dedicated for high-voltage equipment shall have at least two connections to the external earth grid of the substation.

Two sets of portable three-phase earthing devices and one set voltage indicators with connection adapters and lifting poles shall be included in the supply for the HV system. Two sets of portable three-phase earthing devices and one set voltage indicators with connection adapters shall be included in the supply for the 33kV system. The conductors shall be rated for 25kA for 1 second short circuit current. The conductor lengths shall be suited for the application in the outdoor 130kV switchgear. Contacts for these temporary earthing devices shall be installed on the 130kV equipment as to allow the application of these temporary earths by personnel when performing maintenance work on the 130kV equipment. The arrangement shall consist of contacts on the conductors as well as earthed contacts on the supporting structure. See SS-EN 61230 for requirements. Arrangement for storing the earthing devices in a safe manner shall be installed in the 33kV switchgear room of the substation building.

The Employer has carried out preliminary soil resistivity testing of the complete wind farm. These are available to the Contractor to carry out initial designs, see 01986-002515 - Sidensjö Earth Resistance Measurements 2011-11-7 final and 01986-010050 - Sidensjö Earth Resistance measurements Tyens T44 + T48 2012 11 05. However it shall remain the successful Contractors responsibility to perform their own substation earth resistivity tests before undertaking the detailed earthing design. The method used at each location across the whole wind farm site has been the Schlumberger Palmer test method with the test records sheet being supplied by The Employer for the recording of these results.

The Contractor will prepare an earthing & lightning protection design report, which will demonstrate the safety of the design and shall be included with the as-built documents. The method of earthing design calculations will account multi-layered soil structures and fault current split factors contributed by 130kV transmission line aerial earth (ground) conductors.

The Contractor will ensure that the earthing design of the Wind Farm is fully coordinated with that of the Grid Company and that of the wind turbines.

12.21.1.1 Sidensjö North Minimum Substation Earth Grid

The Sidensjö North substation has been provisionally modelled by the Employer. This has been based on an approximate overall 62m wide by 43m long substation area earth grid, the following is therefore based on that assumed area and indicates the maximum spacing’s between conductors and the minimum numbers of conductors to be installed. The Contractor shall provide his design for review and comment in line with the following requirements.


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The 4 off corner earth rods shall be installed in packed down Bentonite to a depth of 50m. If ground conditions dictate that Bentonite may be lost/washed away over time the contractor shall use suitable low resistivity concrete mix, such as Marconite. Specification for this shall be agreed with the Employer before installation. Around the outer perimeter buried conductor there shall be a minimum of 41 off, evenly spaced, 3m long earth rods. These shall be installed vertically so that the top of the rod is 0.5m below finished surface level. The area of the substation shall be crossed with buried earth conductors in both longitudinal and horizontal directions to produce a buried earth grid spacing of no more than 5m between conductors in either direction

See NV indicative drawing 01986D4005

12.21.1.2 Sidensjö South Minimum Substation Earth Grid

The Sidensjö South substation has been provisionally modelled by the Employer. This has been based on a an approximate overall 69m wide by 62m long substation area earth grid, the following is therefore based on that assumed area and indicates the maximum spacing’s between conductors and the minimum numbers of conductors to be installed. The Contractor shall provide his design for review and comment in line with the following requirements.

The 4 off corner earth rods shall be installed in packed down Bentonite to a depth of 50m. If ground conditions dictate that Bentonite may be lost/washed away over time the contractor shall use suitable low resistivity concrete mix, such as Marconite. Specification for this shall be agreed with the Employer before installation. Around the outer perimeter buried conductor there shall be a minimum of 50 off, evenly spaced, 3m long earth rods. These shall be installed vertically so that the top of the rod is 0.5m below finished surface level. The area of the substation shall be crossed with buried earth conductors in both longitudinal and horizontal directions to produce a buried earth grid spacing of no more than 5m between conductors in either direction.

See NV indicative drawing 01986D4005

12.21.2 Wind Farm Substation Sizes and Earthing Interfaces

It is intended that the Wind Farm substations shall each be designed as a standalone system. The Contractor shall therefore design each of the sub-station earthing systems to be a standalone system capable of safe operation and connection to the 130kV grid with no additional earthing connections available other than those that are installed as part of the individual sub-station construction and energising 130kV OHL.

There shall be a separate earthing system for the wind farm array. The details of this separate system are as briefly outlined within other sections of this specification.

The overhead line shall be installed with a continuous overhead OPGW earth wire. In addition for 1000m out from both substations an additional OHGW lightning protection wire shall be installed on the overhead system. The OPGW and OHGW wires shall be bonded together at each pole and at the interface to the substation earth grid. The OPGW conductor shall be bonded to a pole earth electrode at those poles (most but not all) where it is both practicableand desirable to establish an earth electrode.

The OPGW conductor shall be bonded into the substation earth grid at the remote Grid Company owned UT171 Moliden 130kV substation.

In the case of the Sidensjö North substation earth grid design, it is acceptable for the Contractor to include a reduction factor (current split factor) resulting from the inductive and


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conductive contribution of the OHL OPGW and OHGW conductors running between Sidensjö North and UT171 Moliden only.

In the case of the Sidensjö South substation earth grid design, it is acceptable for the Contractor to include a reduction factor (current split factor) resulting from the inductive and conductive contribution of the OHL OPGW and OHGW conductors running between Sidensjö South and UT171 Moliden.

Therefore when the multiple systems are interconnected at the interface point of the wind farm sub-station it shall be to the mutual benefit of all systems.

At the Sidensjö North substation and for purposes planning NV have applied for an outdoor open terminal substation compound (for all HV and outdoor 33kV equipment) with an area as defined by the outside compound fence of 62m by 43m. The OHL will terminate on 2x under-tension terminal structure located within the substation compound. These terminal structures shall be designed, supplied and installed by the Overhead Line Contractor, on foundation to be designed and installed by the Contractor.

The substation control building containing all 33kV switchgear, SCADA and Communications equipment shall have an outer size of 12m x 35m. This shall be built adjacent to the HV compound so as to form 1 off the sides of the outdoor HV & 33kV compound. The maximum height of the building shall be 7.5m above finished ground level.

At the Sidensjö South substation and for purposes planning NV have applied for an outdoor open terminal substation compound (for all HV and outdoor 33kV equipment) with an area as defined by the outside compound fence of 62m by 69m. Here the OHL terminates into a 50m long 2x 630mm² Aluminium 170kV rated HV Cable connection that shall be installed and terminated by the Overhead Line Contractor into cable sealing ends, located within the substation compound adjacent to the open terminal busbar, supplied by Substation Contractor as part of the HV scope of supply.

The substation control building containing all 33kV switchgear, SCADA and Communications equipment shall have an outer size of 12m x 39m. This shall be built adjacent to the HV compound so as to form 1 off the sides of the outdoor HV & 33kV compound. The maximum height of the building shall be 7.5m above finished ground level.

The Contractor shall therefore plan out the 2 off substations to fit within these size allowances and the associated earth grid sizes. In the event of these sizes not being achievable the Contractor shall immediately advise the Employer and seek approval before proceeding with the design.

12.21.3 Additional Terminations Required on Substation Earth Bar

The Contractor shall make provision for the wind farm array earth conductors to be bolted to the substation main above ground earth bar located in the 33kV rooms by the Cabling Infrastructure Contractor. This provision shall be for at least 3 off at Sidensjö North substation and 6 off at Sidensjö South substation earth cables (plus 50% spare) each sized at 50mm² to be bolted to the substation earth bar via suitable cable glands/shoe.

All metallic structures such as pipes, doors, frames etc within the substation are to be connected to the substation earth.

12.21.4 Earthing Connection from the Overhead Line

The Contractor shall allow for the connection to the overhead line earthing cables from the Overhead Line Contractor, the Contractor needs to allow for 3 off earth cables (OPGW, local


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OHGW lightning protection for 1000m out from substation and possible buried earth conductorinstalled under the OHL route) from each overhead line connection to be brought into the substations.

For Sidensjö South these shall be brought down from the over head lines outside the substation compounds and connected to the substation earth grids via dedicated connection points, the Contractor shall supply ducts extending out from the substation earth grid connection point to a point adjacent to the last overhead line termination pole.

For Sidensjö North the OHL contractor may bring the earth’s and fibre connections down into the compound or from support poles outside the compound. The Contractor shall be responsible for co-ordinating with the OHL contractor and supplying the required earthing and Fibre ducts into the substation connection points. If these are brought down to ground outside the HV compound then the Contractor ducts shall run to 3m outside the HV compound to an agreed point

These connection points shall be accessible for, isolation, maintenance and inspection.

Terminations shall be carried out by the Contractor after agreement with the Overhead Line Contractor and the Grid Company.

12.21.5 Foundations for Under-Tension Overhead Line Terminal Structure

The Contractor shall be responsible for the design and installation of a suitable foundation for the Over Head Line contractor to mount his 2 off terminal structures that will have to install in the North substation. One structure shall form the foundations for the OHL link to Moliden Grid substation and one structure shall form the foundations for the OHL link to Sidensjö South substation

The Overhead Line Contractor shall be responsible for the supply of all design requirements such as loadings, minimum foot print area etc. for the foundations. The Contractor shall request these design details in a period that allows for the design of these foundations to ensure the overall programme is achieved. It shall be the Contractors responsibility to co-ordinate with the OHL contractor to ensure the OHL programme can be achieved at the substation connection ends

12.21.6 Panels for Storage of Maintenance Equipment for the Overhead Line

The Contractor shall supply and install panels in both the substations for the storage of the temporary earthing equipment and other similar items used on the overhead lines during operation and maintenance. The Contractor shall therefore contact the Over head line contractor and find out the required cabinet sizes to allow these items of equipment to be kept in the substation in clearly labelled and locked cabinets

12.22. Cables, Terminations and Accessories

12.22.1 General

If otherwise not stated the required termination parts, joints, connection details and fixing devices shall be part of the Contractors delivery. For a description of cable installation in buildings see SS 424 14 38. For cable laying in ground see SS 424 14 37. For construction of electrical installations for low voltages see SS 436 40 00.


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For dimensioning of low voltage cables see SS 424 14 05 and SS 424 14 24. There is further information about dimensioning of medium voltage cables in SS 424 14 16, appendix C. Cable properties at short-circuit is treated in SS 424 14 07. The Contractor shall prove his dimensioning by presentation of calculations.

Applicable standards and regulations shall be followed.

The Contractor shall prepare a layout drawing for proposed cable trenches / ducts in the switchyard area for approval by the Client. All cables within the substation area shall be installed in ducts where ever the ground above the cables and for 1m either side of the cables may be exposed to vehicle type loading or loading due to movement of equipment e.g. Transformers.

Direct burial of cables will only be allowed in route sections not exposed to ground loading, these areas must be shown on the substation drawing and by an agreed method at site e.g. warning signs.

The routing of the 33kV cables is to be designed to allow a spare cable length capacity on each cable which will enable re-termination of cables at a later date due to any termination failure or cable fault.

The Contractor shall be responsible for the supply, laying, termination and testing of required cables within the substation boundary up to the commissioning stage.

12.22.2 33kV Cables

Power cables shall be XLPE insulated and be dimensioned for a maximum of 90ºC conductor temperature. Parallel connected single-conductor cables shall be laid in a trefoil (triangle formation) with at least 300 mm distance between parallel connected cable groups. When directly buried e.g. incoming wind farm array 33kV cables with SCADA cables, shall have at least 600mm between adjacent parallel routed MV cables.

Where cables are installed and the screen is not earthed at both ends i.e. with an opened shield circuit, consideration to induced voltages in the cable shield (shall be shown with calculations). Where required voltage control measures shall be employed to hold these open shield voltages down to safe levels at the substation. No turbine array cables are planned to be single point bonded.

Power cable, laid indoors or to the largest extent indoors shall have fire protection class F4.For outdoor laying, the cables and cable markings shall be attached with bonding band made of stainless steel. The Contractor shall ensure installation does not cause cable damage due to induced circulating currents.

The Contractor shall be responsible for the sizing of the 33kV cables within the substations. This shall take into account the installation arrangement and assume the cables are at continuous rating for the connected equipment. The use of cyclic de-rating of main Grid connection cables is not allowed. These cable calculations shall be submitted to NV for comment in line with other drawing submissions



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12.22.3 Power Cables for Auxiliary Power

The Contractor shall supply and install all required low voltage cabling within the wind farm sub-stations including the LV cable between the Grid and auxiliary transformers and the main LV power distribution centre (VHC) main distribution board in the sub-station buildings.

Small power cables for installation inside and outside the building shall be provided with metallic shields that are earthed in both ends.

12.22.4 Signal and Control Cables

All signal and control cables, excluding those lain within the control room, shall be provided with shields that are earthed in both ends. For communication between control equipment in control room and connecting devices in electrical switchgear (breaker, disconnecting switch etc.) the cable is to be connected to each device. For current and voltage transformers cables are laid directly to each cabinet, one cable per core and respective group. Auxiliary supply shall be arranged in separate cables. The conductor area shall be dimensioned with regards to voltage (potential) drop, load, over current value and disconnection of circuits impaired by faults. Minimum size of cables is 1.5 mm2 copper unless its use is for CTs where the minimum size shall be 2.5mm2.

The cable number for the cable to the control unit shall be taken from the established cable list for the station. Each new cable shall be provided with a unique number.

Cables between switchgear and the control building shall be provided with a shield that is earthed at both ends.

12.22.5 Cable Laying

Cables indoors shall be laid into cable pits or on cable racks. All control and regulating cables shall, if indoor, be laid on cable racks or in cable pits. Cable racks cannot pass between fire cells. The cable rack is to be divided as the cable leaves the fire cell boundary and fire sealant installed to prevent fire spreading via the cable routes.

Cable sealing in external walls is carried out with dedicated joints or sealed with waterproof & fireproof material. Walls between different rooms in the building are made fireproof with soft compound. All pipe/duct for regulating cable are made tight outdoors with a waterproof compound. Cable ways not used in buildings shall be made water tight (waterproof).

Power cables shall be equipped with cable protection to at least 1000 mm beyond the floor or constructed ground edge.

12.22.5.1 Laying of Signal and Control Cables

Control cables, power cables and earth connections shall be laid separately. Current circuits, A.C. circuits and D.C. circuits shall be laid in separate control cables. Cables shall be fixed in cubicles before going through floors or ceilings. Control cables mounted against walls, or other places where mechanical damages

might occur, shall be equipped with protection to at least 1000 mm beyond the edge of constructed floor in the form of pipes or open protective profiles.

All control cable shields shall be earthed at both ends if otherwise is not stated, except in insulated battery centrals were the shield is cut off and insulated.

Shields for control cables shall be connected to ground bar in cabinet as close to cable opening as possible. Only one shield shall be connected under each screw. If the shield is used as protective ground it shall be equipped with a yellow-green marking.

Reserve cable cores/parts shall be able to connect to any connection block in respective cabinet.

All cores must be marked.


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Cables shall not be jointed. All cores including spares are to be terminated.

12.22.5.2 Laying of Electronics Cables

Electronics cables shall be laid separated from power cables and cables for lighting. Crossings between power cable and electronics cable should be done at a 900 (ninety)

degrees right straight angle at the point of crossing. Electronics cables are cut and stripped as close to the connection object as possible. The shield is equipped with a transparent hose and shall be connected to a special

PEN-bar. Only one shield is connected under each screw. Shield with a cage and a protective conductor in the same cable can be connected to the same connection point.

For electronics cable connected in cabinet with remote control terminal, the shield shall be grounded only in the terminal cabinet.

Shields shall be earthed at the distribution frame end only. Cables shall not be jointed.

12.22.5.3 Laying of Optical Cables

Optical cable shall be mechanically protected in pipe/duct or in another suitable way. The colour of mechanical protection shall be green.

Extra lengths shall be coiled with a bending radius that exceeds the minimum recommended by the manufacturer.

For laying out doors or similar the cable shall be laid in a flexible hose or plica-pipe in such a way that the allowed bending radius is not under passed and that mechanical stresses are minimized.

At the adapter: it shall be able to loosen the cable (light guide) without any risk for mechanical damage.

Laying, lengthening and end part of optical cable shall be carried out of personal with suitable training.

12.22.5.4 Cable Pits and Cable Ducts

Required cable pits and cable ducts for cabling between the control room and the switchgear shall be part of the contract. Required excavation, laying and refilling are included in the contract.

Cable ducts are the preferred method within the substation.

12.22.5.5 Cable Ducts

Cable ducts shall be PEH, yellow or for optical cables green according to SS 4241437 and be constructed either with a smooth inside and/or corrugated/rigid outside.

Corrugated flexible ducts are not suitable for under roads. The dimension on cable ducts shall be 75 mm for lighting cables and minimum of

100 mm for other cables. Individual 33kV cable ducts used to form a trefoil arrangement shall be 110mm inside Diameter

All ducts, buried or where sections or whole route is above ground, shall be UV stabilized or UV resistant and suitable for above ground exposed use

Cable ducts shall be laid with an inclination of 1:400 and shall be supplied with drainage holes underneath at low points. The ducts shall be connected to the foundations’ cleaves, cable pits, casting grates in ground plates or pulled up to the top of the ground plate. The duct (or tube) bend for reaching the top of the foundation shall be made of corrugated PVC duct or -


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tube or a bend made of a smooth stiff tube or duct. The radius in the bend shall be at least 1000mm for small cable use or 1200mm for 33kV cable use. Any joints shall be sleeved and made waterproof. The ducts/tubes shall be equipped with pulling wires and in the free end with a waterproof plastic pad. The pulling wire shall be tested after the duct/tube laying. This is also valid for spare ducts/tubes.

Ducts are to be kept sealed and protected against damage during construction works. They shall be cleaned before use and sealed post cable installation.

The layer shall be constructed with the thickness 100 mm over the conductor pit’s complete width and with a multiple-graded material type 3 and 4, table CE/1 according to plant AMA 07 and with the largest size of granulation of 20 mm. The material is packed according to CE/4 and above conductor according to table CE/5.

Backfilling 100 mm closest to cable duct are carried out with gravel 2-8 mm. Remaining fill shall be performed according to Plant AMA 07 CEC 4.

12.22.5.6 Cable Pits

Preference shall be given to substation designs that shall not include cable pits. Where possible the contractor shall use ducting from one area to another area, where needed the intersection of 2 ducts shall be accessible by manholes/pull pits installed at the ducting junction.

If Cable Pits have to be used they shall be in limited locations and they shall comply with the following.

Cable pits shall be equipped with concrete or steel covers (wood will not be acceptable) and galvanized panels on the inside.

Cable pits and pipes/ducts are performed with a reserve space of at least 30 %. There shall be drainage under the cable pit which shall be connected to the site

drainage system.

Removable closings are constructed of galvanized steel and a size that makes it possible to open by hand without tools.

Cables rising up from the ground shall be equipped with mechanical cable protection. The cable protection shall cover the cable ducts and the cables to 1000 mm above the ground. The protection shall be constructed of thick sheet aluminium or where it´s suitable the cable ducts can be extended to be as a cable protection. Duct/tube/pipe endings shall be sealed.

Cable manholes for optical fibres shall be possible to lock with a padlock.

12.23. Inspection & Testing

12.23.1 General

Inspection and testing shall be carried out by the Contractor at all stages of manufacture and installation to ensure the Works conforms in all aspects to the technical requirements of plant, equipment, structures and apparatus.

The inspection and testing shall, as a minimum requirement, demonstrate compliance and be in accordance with international standards and codes of practice and also satisfy the requirements of the inspection and testing procedures of the local network operator and of all applicable manufacturers’ specifications and recommendations.


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The Contractor shall supply an Inspection and Test Plan, for review by the Employer, within two months from the Commencement Date. All inspection and testing shall be carried out in accordance with this Inspection and Test Plan.

A complete schedule of all tests during manufacturer, installation and commissioning, in accordance with applicable Standards and codes of practice for all equipment and component parts, shall be included at tender stage.

12.23.2 Factory Tests

Factory acceptance testing shall be performed in the presence of the Employer or appointed representative. Factory acceptance tests shall be included to the extent specified in the technical requirements for all plant and equipment.

As a minimum requirement, each item of equipment shall be subject to routine testing, as defined by the relevant Standards, at the factory before shipment. A detailed factory testing programme identifying each set of factory tests and the proposed dates for the tests to take place shall be submitted no less than four weeks prior to the commencement of these tests.

Type test certification appropriate to the supplied equipment shall be provided by the Contractor to the Employer. Where type test certification is not available, or is not considered relevant or acceptable by the Employer, the Contract shall perform type testing as specified by the relevant Standards at no additional cost to the Employer.

12.23.3 Witness Tests

The Employer, at his discretion, may undertake witness inspections of plant items during manufacture. The inspection by the Employer or the Employer's Representative on plant items, the Contractor’s Documents, or any other documents provided in relation to the Contract shall not relieve the Contractor from any obligation or responsibility under the Contract.

12.23.4 Approval & Certification of Design Works

A complete schedule (must encompass all statutory tests) of all applicable and relevant approvals and certifications of design that shall be necessary for the Works in accordance with currently enforced local legislation, codes and standards shall be included at the tender stage. As a minimum requirement this shall include building electrical services.

The Contractor shall coordinate and plan all testing and obtain all documentation required to obtain approvals and certifications of design by the appropriate authority.

12.23.5 Tests on Completion

12.23.6 General

Inspections, testing and commissioning of all supplied plant, equipment, structure and apparatus shall be carried out by the Contractor as necessary to demonstrate compliance with international standards and codes of practice and also satisfy the requirements of the applicable network operators testing and commissioning procedures and all applicable manufactures specifications and recommendations.


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Inspections, testing and commissioning shall be carried out, as far as is reasonably practicable, as an ongoing activity during the Works.

The Contractor shall be responsible for the coordination of the inspections, testing and commissioning programme to meet the requirements for testing and commission of the generating plant in accordance with the overall project programme.

Not less than 12 weeks prior to the commencement of commissioning, the Contractor shall provide a detailed site testing and commissioning programme, and procedure including forms for commissioning and the Tests on Completion, identifying each site test, requirements for any site facilities and the proposed dates for this work to take place.

Not less than 1 week before the date of the tests, the Contractor shall provide certification of all the calibration and correction curves for all instruments to be used during the tests. From these calibrations and curves, it shall be possible to determine the error introduced by each instrument or measuring devices.

All test equipment shall be calibrated by an accredited test agency. The calibration certificates shall not be older that one year for electronic devices and two years for electromechanical devices, in no cases shall equipment be used that is outside its valid calibration period. No test measuring equipment shall be installed without the Employer or the Employer's Representative having been giving the opportunity to witness the testing.

Notwithstanding the detail of the proposed test schedule the Contractor shall provide the Employer and the local network operator with an opportunity to witness all tests by giving a minimum of seven days notice in writing of the commencement of any testing and including estimated durations of the tests. The Employer and the local network operator may at their discretion witness all tests.

The Tests on Completion will not be allowed to commence unless this procedure has been completed and no allowance shall be made for delays so caused.

All proposed site testing and commissioning tests are to be submitted in the tender. Refer to technical schedule in Employer document ’Sidensjö EPC Contract - Electrical System Test on Completion Records - Substation Part’, ECM 01986-011461, for minimum requirements.

The Tests on Completion shall be undertaken in such a way as to demonstrate that the Works is capable of meeting all aspects of the tests without any changes in plant settings, exchange of parts of adverse effects on the surroundings. The Works must be able to meet all of its performance requirements simultaneously even if these are not tested together.

12.23.6.1 Recording of Data

The log sheets taken during the Tests on Completion shall be signed by the operator, The Contractors Representative and the Employers Representative immediately after each test. Two copies of these log sheets shall be issued to the Employer as soon as possible after signing.

12.23.6.2 Site Testing & Commissioning

Site testing and commissioning schedules shall be provided by the Contractor to the Employer for review and comment, in advance of undertaking any site work, for each major item of equipment. These schedules shall detail, as a minimum, who is to perform the work, what work shall be done and what types of test equipment is to be used.


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The Contractor shall be responsible for the coordination of a commissioning panel and shall prepare a commissioning programme to cover, as a minimum, the following stages;

i. Pre-commissioning inspection

ii. Off-load commissioning test programme

iii. Pre-energisation inspection

iv. Energisation and on-load commissioning tests

v. Post-commissioning inspection

The Contractor shall perform pre-commissioning inspections of the whole Works and associated equipment before it is commissioned or put into operation, to confirm the completeness of the installation and its general acceptability to enable off-load commissioning test to commence.

The Contractor shall be responsible to perform off-load commissioning tests that shall include, but not be limited to, the following;

a) Cable continuity and phase rotation

b) Insulation resistance tests;

c) MV cable sheath insulation tests

d) The Civil Contractor installing the turbine foundations shall perform earth resistance measurement testing of all turbines with each turbine and the permanent met/communication mast as a stand-alone system, i.e. interconnecting earth cables between turbines disconnected. Method of testing is to be the fall-of-potential slopemethod.

e) Earth resistance measurement testing of the wind farm substations is to be carried out as a stand-alone system, i.e. interconnecting earth cables between wind farm sub-station and the turbines disconnected, by the Contractor. In addition, earth cables from the Grid Company, connected by the overhead line, (in agreement with NV) shall also be disconnected. Method of testing is to be the high current fall-of-potential method utilising the 130kV OHL for current injection.

f) Earth resistance measurement testing of the wind farm array is to be carried out as a stand-alone system, i.e. interconnecting earth cables between wind farm array and the sub-station earthing grid shall be disconnected. Method of testing is to be the fall-of-potential slope method. This testing shall be the Cable Infrastructure Contractor’s responsibility.

g) Earth resistance measurement testing of the complete wind farm is to be carried out i.e. interconnecting earth cables between wind farm substations and Grid, between wind farm substations and wind farm sub-stations and the turbines connected to that substation, by the Contractor. Method of testing is to be the high current fall-of-potential method utilising the 130kV OHL for current injection.

Results are to be submitted to the Employer and approved before energisation of the wind farm 130kV and 33kV systems.

h) HV and 33kV voltage withstand tests; these shall be applied to all bus bar, line and connected equipment and conductors, individual substation 33kV cables installed as part of Contractors scope prior to energisation. To include Very Low Frequency (VLF)


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testing or Dampened AC testing (Option to be agreed with the Employer) and PD/tan delta footprint testing.

i) High and Medium voltage equipment tests including;

a. Switchgear inclusive of circuit breaker, disconnectors and earth switches

b. Transformers

c. Busbars, cables and surge arrestors

j) AC system tests associated with AC circuit diagrams including current transformers, voltage transformers and primary injections;

k) DC system tests associated with DC circuit diagrams including secondary injection of DC relays and circuit diagram logic tests;

l) Battery load test which shall verify that the capacity of the batteries and that DC system is enough for at least 12 hours operating of the substation when the battery chargers are out of service

m) Equipment secondary injection;

n) Power supplies including 110V DC battery supplies, 110/48 or 24V DC power converters and associated distribution boards, low voltage AC supplies, primary & secondary power supplies including standby generator interface and changeover facilities and associated distribution boards;

o) Common equipment including busbar protection, interlocking, check-synchronising or dead bus detection, air systems and substation control systems;

p) Functional testing of all electrical and mechanical interlocks

q) Auto-switching off-load simulation tests;

r) End-to-end tests including inter-tripping, protection systems and substation control systems;

s) Functional Protection relay testing on all HV (130kV), 33kV & LV equipment, inter tripping into the HV (130kV) and 33kV systems. The LV protective devices shall be trip tested using the test pushbutton

t) Demonstrate CB trip tests using secondary injection of each protection relay

u) Installation tests of LV systems prior any energisation following to the requirements in SS-4364000 as a minimum.

All tests shall be recorded in Site Test Sheets and are required to be witnessed and signed off by the Employers’ representative

The Contractor shall be responsible to perform pre-energisation inspections that shall include, but not be limited to, the following;

a) Confirmation of circuit nomenclature and confirmation that equipment phase connections are in accordance with the phasing diagrams


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b) Checking equipment safety clearances and the application of locks

c) Checking position of all values (e.g. transformer cooling equipment) and ensuring satisfactory indication of all pressure gauges

d) Checking that all equipment is satisfactorily earthed

e) Ensuring the satisfactory condition of all battery supplies

f) Checking that all test connections have been removed and confirmation of the tightness of all terminations

g) Confirmation that all current transformer links are normal and that all protection and control relay settings have been applied correctly

h) Confirmation that all commissioning documentation is complete

The Contractor shall be responsible to perform functional tests to demonstrate to the Employer that each item of plant is capable of correctly performing the function for which it was specified. Normally the functional tests may be performed as secondary tests (i.e. without the high voltage part being energised), however all functions shall be tested in such a manner that it can be safely assumed that the function exists and will operate as required within the infrastructure of the operational plant.

The Contractor shall be responsible to perform on-load commissioning tests that shall include, but not be limited to, the following;

a) Verification of phase rotations and measurement of operational voltage and currents

b) Directional tests of directional protection, control and metering

c) Secondary current measurement of 3-phase CT residual circuit to verify correct polarity of 3-phase CT set

d) Verification of transducers, meters and instrumentation

e) Verification of automatic control functions

All commissioning tests shall be completed and final documentation submitted to the Employer before the plant is taken over.

12.24. Summary of installation Works

12.24.1 HV Works

The installation works associated with the HV switchgear shall include, but not be limited to the following:

a) Specification, design and supply of 130 kV equipment and connectors to be located within the confines of the wind farm substations required to form a fully functional 130kV substation at both Sidensjö North and Sidensjö South. In addition, the scope includes the provision of all equipment including mechanical supports and cable terminations suitable for the overhead line Company power cables, earth cables and SCADA cables within the substation compound as they connect to the substation Contractor supplied equipment.

b) Off-loading and placing into final position all substation HV equipment.


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c) Full assembly of switchgear, component parts and associated ancillary equipment.d) Bolting and fixing of switchgear when in final position.e) Testing and commissioning. f) Switchgear and support steelwork (supply & install) mounted on the required

foundations that form an integral part of the Contractors scope and the foundation for the overhead line terminal structure at the North Substation.

g) Connection of the 130 kV switchgear panels to the substation earth-bar.h) Appropriate training shall be provided on the operation of the switchgear to the local

utility representative and to the wind farm operator.

12.24.2 Grid Transformer Works

The installation works associated with the 130/33 kV Grid Transformers shall include, but not be limited to the following:

a) Supply of the Grid Transformers, detailed in the NV Specification 01986-010214. b) Off-loading and placing onto final position on the required foundations that form part

of the Contractors scope.c) Final assembly of each transformer, component parts and associated ancillary

equipment required to complete the transformer.d) Bolting and fixing of transformer and associated switchgear & control panels when in

final position including LV connections to substation control panel.e) Testing and commissioning. f) Cable and support steelwork (supply & install).g) Connection of the transformer to HV substation equipment and 33kV switchgear

panels and to the substation earth-bar.h) Appropriate training shall be provided on the operation of the transformers to the

wind farm operator. The training is to be conducted in Swedish as a minimum.

Note: The Contractor shall consider maintenance requirements for all transformer oil bunds such as regular emptying of the bund at all times including during winter conditions and consideration of environmental requirements.

Note: The Grid Transformers shall be located above a dedicated oil bunded area suitable for containing the total transformer oil volume plus 10%. The height of the bund wall shall not be less than 300mm to prevent melt waters draining into the bund. All other equipment within the substation which will require an oil containment bund shall not utilise the same facility as the Grid Transformer. Due consideration must be made regarding the prevention of fire or explosion spreading to the Grid Transformer from faults occurring in equipment located within a 5m distance from the proximity of the Grid Transformer.

12.24.3 33kV Works

The installation works associated with the 33kV switchgear at each substation shall include, but not be limited to the following:

a) Specification, design and supply of 33kV equipment and cabling to be located within the confines of the wind farm substation building constructed as part of this contract.

b) Off-loading and placing into final position.c) Full assembly of switchgear, component parts and associated ancillary equipment.d) Bolting and fixing of switchgear when in final position.e) Testing and commissioning. f) Switchgear and support steelwork (supply & install).g) Connection of the 33kV switchgear panels to the substation earth-bar.h) Appropriate training shall be provided on the operation of the switchgear to the local

wind farm operator and nominated personnel


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12.24.4 LV and Auxiliary System Works

The installation of all auxiliary works associated with the wind farm shall include, but not be limited to the following:

a) Supply of the LV Lighting and small power systems, LV Switchgear, LV and instrument cabling, UPS & battery charger systems, protection and control equipment to meet the minimum specifications as detailed in this specification and as detailed in the relevant sections of this specification.

b) Off-loading and placing into final position.c) Full assembly of all equipment, component parts and associated ancillary equipment.d) Bolting and fixing of all equipment when in final position.e) Testing and commissioning. f) Cable and support steelwork (supply & install).g) The connection of all equipment to associated equipment panels and to the substation

earth-bar.h) Appropriate training shall be provided on the operation of all equipment to the local

wind farm operator and nominated personnel.

12.25. Miscellaneous Works for Both Substations

The Supplier/Contractor shall be responsible for the complete design, supply, installation, testing and commissioning of the wind farm protection, control/SCADA and battery charger systems, all in accordance with the relevant standards and codes of practice. This will include, but is not limited to the following:

a) The installation of all panels into their final positions including any supporting metalwork and fixings, this will include the Wind turbine SCADA system panels that shall be supplied by the turbine manufacturer.

b) Install and terminate all LV cabling and multi-core control cabling to and from the wind farm 33 kV circuit breakers, protection, AVC, monitoring, alarm and battery charger panels. An interface marshalling box shall be provided on the 33 kV circuit breaker panels by the switchgear manufacturer. Multi-core cables shall be to the relevant Swedish standards or equivalent IEC standards and shall have 600/1000V LSF sheaths.

c) Install and terminate all power and multi-core cabling from the sub-station HV and 33kV switchgear and Grid and Auxiliary transformer to the protection, control, monitoring and alarm panels.

d) Install and terminate all interconnecting cabling, between the protection, control/monitoring and alarm panels.

e) Install and terminate all interconnecting fibre optic cabling, between the protection, control/monitoring, SCADA and alarm panels including the supply and installation of any required patch panels within the sub-station confines, including a common fibre optic interface panel to which all fibre optic cables supplied by the Overhead Line Contractor and Cable Infrastructure Contractor shall terminate their cables.

f) The glanding and terminating of all cabling into the panel terminal rails, including the provision of ferrules, cable markers cable trays and conduits etc.

g) The supply and installation of all split core CT’s and control wiring. h) Supply and installation of main earth bar and all earthing conductors between all

individual panels and the main earth bar within the substation, including all supplementary earthing and cross bonding and buried earthing conductors/rods. All earthing to comply with the requirements of the relevant Swedish requirements or equivalent IEC standards.

i) The supply and installation of any cable carrying tray work or trunking etc, associated with the protection, monitoring, alarm and SCADA installations.

j) 12 hour load duration test for primary and secondary battery tripping supply.k) AMP testing, AC & DC tests, injection testing, CT Magnetizing and Polarity tests.


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l) Calculation, application and co-ordination of all settings for protection relays, AVC relays and control devices, including devices located within the wind turbines or within the self contained turbine transformer sub-stations as applicable.

m) Testing and commissioning the completed installed systems proving full functionality to the satisfaction of the client.

n) All necessary software programming and setting of protection, monitoring and control devices, AVC settings. PQM meter configuration to be performed by the Contractor.

o) The provision of space, power supplies (main and UPS) for the turbine SCADA system, assist in the installation and commissioning of these panels

p) Liaising with others, including but not limited to the local electrical utility, switchgear manufacturer and switchgear installation Contractor during switchgear testing, commissioning and any interface works.

q) The supply and installation of all ducts for the 33kV, LV, Fibre optic and earthing cables between the substations and turbines, or overhead line out to a distance of 3m beyond the outer buried radial substation earth conductor.

r) Supply, installation test commissioning of all necessary tariff metering and PQM power quality metering units with the windfarm substations

s) The supply of the wind farm metering panel and all required fitting, setting to work and commissioning documentation to the Grid Company for fitment into the Moliden Grid substation along with co-ordination of installation of the overhead line Optical Distribution panel, GMS (Grid Measuring Station - Turbine Controller input) & Substation Interface SCADA panel.

t) The provision of space, power supplies (main and UPS), fibre cables to substation break out boxes for the Grid Company Communications/ SCADA system, assist in the installation and commissioning of these panels

12.26. Summary of the Miscellaneous Works for Moliden Grid Substation

The Contractor shall be responsible for the specification of protection equipment to be fitted at Moliden Grid substation and for reaching agreement with the Grid over the type of equipment to be fitted and free issued etc. The Grid Company has advise a suitable room shall be provided for the required WF interface equipment

The Contractor shall be responsible for specifying the WF development CT and VT requirements to the Grid Company for all protection monitoring and control functionsincluding those of the Turbine Controller via the GMS. The Contractor shall ensure the power and communication requirements of the separately prepared Employer SCADA are provided for and communicated to the Grid Company ready for installation

The Grid Company has agreed that the WF Developer shall supply, install, test and commission their own metering panels at the Moliden substation, but that the Grid company shall supply, install and terminate all cables up to and in to these metering panels. The following two metering panels are to be supplied by the WF Developer:

Composite ‘Check Meter’, ‘PQM’ and ‘Communications’ panel. To be supplied, installed, tested and commissioned by the Contractor.

Turbine Controller GMS panel. To be supplied, installed, tested and commissioned by the Turbine Contractor.

The Contractor shall witness all setting to work and commissioning of Grid substation installed equipment for protection, control, monitoring, Turbine Control and communications. The Contractor shall ensure suitably trained and authorized personnel are available to enter the Moliden substation in advance with the Grid Company.


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12.27. Contract Spares per Substation

3 no. Cable terminations to suit each cable size for termination of 33kV cables to switchgear and equipment within the substation for Contractor supplied and installed cables.

3 no. Surge arrestors of each type and size. 1 no. Battery charger control module. 2 no. Battery/Cells of each type suitable for direct replacement of units in substation

110V DC batteries. 2 no. Indication lamps of each type 2 no. Control switches of each type 1 no. Capacitive Voltage Indicator of each type 1 no. ACB or MCB of each type 6 no. Fuses of each type (except Auxiliary transformer) 3 no. Fuses of each type for Auxiliary transformer (if fuses fitted) 5 no. Light fittings of each type 1 no. Portable hand lamp 1 no. DC/DC Converter of each type if installed in the substation 1 set of HV temporary earth leads.

In addition, the Contractor shall provide a spares list based on a risk assessment to determine the essential spares required for the operation of the 2 off substations over the complete lifetime of the wind farm.


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13. ANNEX 5 – TECHNICAL SPECIFICATION - CIVIL

13.1. General

Buildings and civil works are part of this turn-key project.

This annex to the Substation specification shall be read in conjunction with the other Contract specifications.

The Contractor shall refer to the following NV documents. The Room Schedule (01986-007191) details the room sizes agreed with the end client and so the Contractor shall comply with these detailed room requirements. The building arrangements shown in the drawing (01986D2233) are for ‘indicative only’ and were developed to give the end client a idea of what they would eventually be provided with at the Sidensjö North and South substation buildings and the Contractor shall revise these to suit the particular project arrangements at each substation:

NV Document ECM 01986-007191 - Sidensjö EPC Specification Part IX - Service & Maintenance Provisions

NV Drawing 01986D2233 – Sidensjö Wind Farm Sub-Station Indicative Room Layout

The Employers civil subcontractor shall clear the substation area of trees/vegetation prior to commencement of works at both substation locations. All subsequent works shall be the responsibility of the Contractor.

Earthwork, civil works and mechanical works shall be complete and handed over to the Employer in good working condition.

A new complete substation is to be constructed. The height of the substation buildings shall not exceed 7.5m.

An area extending 6m from the substation boundary shall be accessible to the Contractor to enable construction works to take place. Any reinstatement works shall be the responsibility of the Contractor.

The Contractor shall be responsible for the design and construction of the sub-station building and surrounding compound or yard and associated access track and shall supply all materials required to carry out these works.

The Contractor shall agree with NV the exact co-ordinates for each of the substations and the associated switch yard before ground preparation works start.

The substation compound or yard shall be dressed with clean crushed stone and have a bearing capacity appropriate to the equipment housed within.

The work shall include all required foundations and outdoor electrical support structures necessary as well as cable trenches, pipe/duct and drainage systems.

Space shall be provided for car parking and access roads for the transformer and all equipment within the substation.

Finished ground level of the substations shall show due regard to existing ground level and the proposed site infrastructure. The Contractor shall in his planning of the finalized levelling of the substation area ensure the Substation area is no less than 500 mm above surrounding areas and appropriately drained.


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The Contractor is responsible for all design, supply, installation and testing of all civil works.This shall include the supply of all relevant construction level civil and structural drawings and specifications prior to the commencement of works for review by the NV project Civil Engineer.

The Contractor shall draw up a Test plan for all parts of the civil works. Content indicated (but not limited to) in the Inspection & Test plan part of the Tender

The Contractor shall provide O&M Manuals and “As Built” drawings in accordance with the Administrative rules AFD.242. These shall additionally comply with the requirements of Sidensjö Wind Farm. EPC. Schedule 4 – Operation and Maintenance Manuals

13.2. Site Works

13.2.1 Setting Out

All setting out shall be performed by the Contractor in accordance with his drawings which shall be subject to the approval of the NV Engineer. Setting out tolerances shall be agreed with the NV Engineer.

Measuring and setting out shall be performed with calibrated surveying instruments.

Setting out shall be done for roads, all foundations, buildings, cables, drainage systems and fence associated with the wind farm substation and the connection to the overhead line.

13.2.2 Excavation and Backfill

The Contractor shall carry out excavation and any filling works in accordance with his drawings (subject to approval by the NV Engineer) including:

Any temporary dewatering works required during excavation Any temporary works required to shore up excavations Where foundations are over excavated to reach a formation material of sufficient

bearing capacity and the level made up with compacted structural fill the fill material shall be in compliance with the appropriate national standard Anläggnings AMA 07 CEB 112 and CEB 214 and subject to the approval of the NV Engineer

Methods of compaction for structural fill shall be to the appropriate national standard and subject to the approval of the NV Engineer AMA 07 Tabell CE/4.

Where blasting is required this shall be done in compliance with the appropriate national standard

The Contractor shall provide a method statement and risk assessment for excavation/filling works

13.2.3 Substation Hardstanding

The substation compounds or yards shall be dressed with clean crushed stone and have a bearing capacity appropriate to the equipment housed within also including for transports of equipment and maintenance of the Substation’s various systems e.g. Grid Transformers. Substation routes designed for heavy transports shall be clearly marked in design drawings(with supporting documentation/calculations) as well as clearly marked lanes/areas within the substation. In other areas shall be well compacted and be able take the load from any vehicles used for the maintenance of the works.

Car parking shall be provided in close proximity to the substation buildings. The actual requirements shall be agreed in writing with NV before the finalization of the substation layout is agreed


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Where road or switchyard area shall be located over existing ditches for drainage, the drainage shall be changed or, if necessary laid in conduits.

All the actions taken to achieve good rainwater runoff from the site shall be shown in drawings. The drawings shall show dimensions of chosen conduits and inclinations of ground surface.

Dimensioning of the roads superstructure shall be done in accordance to the latest version of “ABT Väg”. At the minimum the roads superstructure shall be done with at least 150 mm sub-base and 100 mm supporting bearing and 50 mm surfacing to a superstructure thickness of at least 300 mm. This includes the area around the transformer foundation/oil bund.

Sub-base is carried out according to “Anläggnings AMA 07”, DCB 232.

Sub-grade is carried out in accordance with “Anläggnings AMA 07”, DCB 320.

Gravel surface is carried out in accordance with “Anläggnings AMA 07”, DCB 412.

The roads are constructed with a cross slope of 2% and in such a way that the superstructure is drained.

If the substructure contains soil such as clay or silty materials geo-fabrics has to be laid to separate the materials between the road super-structure. Geo fabrics shall be layered according to “Anläggnings AMA 07”, DBB14.

Area surfacing and roads are designed for good drainage of surface water (especially for drainage of surfaces around buildings).

The area around the transformer foundation shall be designed and dimensioned for the selected method of unloading and final positioning of the transformer.

The hard standing for switchgear areas shall be designed to support the loading imposed by this equipment and have a of minimum 300 mm thickness. The superstructure is to comprisethe following or similar approved by NV (from top down to the formation level):

- Surface course - 4-16 mm gravel and stone material, layer thickness 50 mm.- Base course - (according to”Anläggnings AMA 07”, DCB.32) normally layer thickness

100 mm.- Sub-base - (according to ”Anläggnings AMA 07”, DCB.23) normally layer thickness 150 mm.- The Employer requires a minimum of two plate load tests to be performed on the

road/hard standing for unloading the transformer prior to unloading. Details to be agreed with the Employer’s Project Civil Engineer.

Slopes beside the yard shall have a maximum inclination of 1:2 (vertical: horizontal) and shall be constructed with heavy outflow in mind.

All repair work on road damages caused by the Contractors work during the contract period shall be included in the contract.

Temporary roads needed for the construction shall be the responsibility of the Contractor.

13.2.4 Drainage

The outdoor equipment shall be well drained. Drainage and ditching shall be carried out in such extent that pools of water are not formed.

Any existing drainage system (ditches etc.) shall be changed if they are in conflict with the site works. Changed drainage shall be integrated with existing ditches in the nearby area.


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Ditches near to the site shall be cleaned up to achieve good runoff from the site.

The following is valid:

- Drainage pipes shall be laid around station buildings and oil pits.- Drainage under houses shall be carried out in accordance with the house deliverer’s

instructions.- Drainage pipes around buildings and oil pits shall be equipped with flushing pipes in each

corner and additional flushing pipes every 30 m if the distance between the wells is longer than that.

- Other drainage pipes shall be equipped with flushing pipes in each end and have an additional flushing pipe every 30 meters if the distance between the wells is longer than that.

- Cable duct shall be drained with a drainage pipe placed at the centre under the duct.- Drainage and surface water shall be drained off by gravity-operated pipes with a minimum

inclination of 1:200 and are connected to ditches outside the switchgear area. If it is allowed in the building permit and there is access to a public water supply and sewer system then this may be used.

- The ditches shall have an inclination of at least 1:100.- Drainage pipes are laid with a highest level which equals the underside of the foundation

and with a least inclination of 1:200. Above and to about 300 mm on each side of the drainage pipe gravel shall be used to fill up to the ground level.

- Drainage pipes shall be PVC with minimum diameter Ø110 and connected to the surface water system.

- Surface water from rainwater pipes is derived with a separate pipe to the surface water system.

- Surface water pipes shall be made of therefore dedicated concrete-, PP- or PVC-pipes.

13.2.5 Earthing Wires in Ground

All work for earthing conductors to be installed in the ground shall be included.

Below Surface conductors are laid at a depth of minimum of 500 mm.

Under the conductors a bedding layer of thickness 50 mm over the complete width of the conductor trench, is to be installed/laid out. The material shall be free of rock/stones and laid according to “Anläggnings AMA 07”, CEC.22 At excavation and backfilling the contractor shall consider the selection of the most appropriate soil material to be used to achieve the best permanent earth conductivity at the installation of the Substation earthing ground system conductors in the ground.

Filling around the earth conductors shall be carried out in accordance with “Anläggnings AMA 07”, CEC.32.

13.2.6 Cable Trenches

The preference shall be to designs that do not use Cable Trenches. The preference shall be for the use of heavy duty ducts with manhole installations where required as detailed previously.

If the Contractors design has to call into use cable trenches then they shall comply with the following requirements. The Contractor shall construct cable trenches of concrete, including top covering. If traffic can be foreseen across a top covering this covering shall be designed allow for the loads associated with the use of the vehicle in relation to the construction of the works as well as for any future maintenance of the plant. The trenches can be constructed by using prefabricated elements. The design shall however be approved by The Employer before installation.


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The top covering shall be agreed with the Employer. Top covering for road crossings etc shall be made of concrete or steel with a wheel pressure capability of 70 kN. If the road is designed for higher pressure capability the coverings shall be designed for the same pressure. The length of trenches for road crossings shall be the width of road + 1.5 metres (minimum).

All top coverings shall be easy to remove and put back on the trenches by working power from one man without any help from machines etc.

Cable trenches shall be arranged with fire-protection dividing between power- and control unit cables.

The bottom of the trenches shall be self-drained by holes every second metre. Alternative method to achieve self-draining shall be approved by the Employer. In not well-drained soil then draining pipes connected to the drainage system shall be placed under the cable trenches.

13.2.7 Cable Pipes/Ducts

PEH pipe/duct in yellow or for optical cables green shall be used, according to SS 424 14 37, for cables leading from concrete foundations to cable trenches. Generally the dimensions of pipes/ducts shall be Ø100 mm for general individual cables into/out of and around the substation development and Ø75 mm for lighting circuit cables. Ø110mm for individual 33kV cables and Ø150mm for individual 170kV cables, in both cases 3 off ducts shall be installed in the trefoil arrangement and each duct shall contain 1 off 33kV or HV power cable. Alternatively the Contractor offer to install 1 off Ø200mm single duct for the installation of each trefoil 33kV and HV cable groups if the cable sizes permit this form of installation, this shall be agreed with the Employer before installation which shall be co-ordinated by the Contractor with the other subcontractors whom shall be installing these cables.

The pipe/duct shall go to the top of the foundation and extend at least 200mm beyond the top of the foundation and be temporarily sealed at time of installation. The Contractor shall select pipe/duct sizes to allow installation of the 33kV cables as required by his routing of these ducts when considering the size of the cables and the minimum bending radius that the cable can be exposed to during installation.

The tube bending up to the top of foundation shall be made of corrugated PVC-tube or a pre-moulded bend made of a smooth stiff tube. The bend radius shall be at least 1000 mm for LV applications and 1200mm for 33kV applications, Contractor to size ducting and bends to suit cables before casting into place. Eventual muffs / joints shall be waterproof.

Pipes/ducts for cables shall be placed with inclination 1:400. The pipes shall have drainage holes in low positions. The pipes/ducts shall be equipped with a pulling wire and in each wire end a fixed foamed plastic pad. The pulling wire shall be tested after the pipe is covered by soil and superstructure.

Under the pipes/ducts shall be placed a 100 mm thick layer of fine grained soil material, maximum grain size 20 mm, covering a width of the whole excavated pipe-ditch. The layer shall be well compacted according to “Anläggnings AMA 07”, table CE/4, before any pipe placing shall be done. Backfill material 100 mm close to the pipes/ducts shall be done with gravel, grain size 2-8 mm according to “Anläggnings AMA 07” clause CEC 4. Over the pipes/ducts all soil layers shall be compacted according to table CE/4 in Anläggnings AMA 07.

Backfilling shall not be carried out until the Employer has approved the placing of PVC pipes/ducts and the casting of cable trenches respectively.

Pull-pits for drawing-in cables shall be positioned each 30 metres where cables are laid in PVC pipes/ducts.


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The Contractor is responsible for the provision of ducts and the connection points within the Substation boundary including 5m beyond the Substation boundary border (or 3m beyond the outer earthing radial – whichever is the furthest from building/compounds) for other’s interfaces and use as listed below:

- Short HV cable from the overhead line termination cable sealing ends into the SidensjöSouth substation HV compound and associated 3 off earthing ducts and 1 fibre optic duct requirement

- 33kV Wind farm arrays including associated Earthing conductors as indicated in the Single line diagram and 33kV cable layouts

- Wind farm Fibre optic cables as indicated in the Fibre optic cable layouts- Grid Connection of the 2 off substations that form the overall Wind Farm consists of the

130kV Overhead lines, Earthing conductors, Fibre optic- Substation temporary power supply and fibre optic connection (Broadband) from the NV

Construction compound (for the future need as spare ducts)

13.2.8 Cross Sections of Underground Cable Trenches

Cable trench details are given on drawing 01986D4305 “Cross Sections of Underground Cable Trench”

13.2.9 Fencing

The entire Wind Farm substation shall be surrounded by a perimeter fence and include access gates, all compound gates must open outwards.

The outdoor open terminal HV equipment shall be enclosed within a fenced off section within the overall outdoor compound. The arrangement shall be such that it creates a HV sub-compound that only authorized and trained personnel can access to prevent general maintenance people or Wind Farm personnel from entering the open terminal HV area. The fences shall be constructed to the guidelines according to Svenska Kraftnät (the state utility of the Swedish Power Grid 200-400 kV), SvK TR9-05.

Due to high levels of snow in the area the fence shall have a minimum height of 3400 mm.Fencing to be designed to allow for temporary removal, if required, to allow installation of all deliveries to site such as the Grid Transformer.

The gate shall be part of the Substation locking system

13.2.10 Foundations

Foundations shall be made of reinforced concrete.

13.2.11 Concrete Works

All concrete works shall be made in accordance with BBK 04 and fulfil the requirements in SS-EN 206-1, SS 13 70 03:2004 and SS 13 70 10 and meet the minimum requirements set out below.

The concrete covering layer shall be a minimum 40 mm and in the foundation bottom 50 mm.

Service life class (“Livslängdsklass”) shall be L2 (100 years).

Exposure class according to SS-EN 206-1 shall be XC4 + XF3.


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The class of concrete shall be minimum C28/35, watertight, workmanship class (“Utförandeklass”) II, and with air content of 5%.

Reinforcement shall be of minimum quality B500BT for main reinforcement and Ss260S for links.

No admixtures shall be used in the concrete unless specific permission for such is given by the Employer.

All concrete foundations and transformer oil pits shall be casted by using flat formwork at the top 500 mm. Concrete edges shall be bevelled 20 mm.

The projecting part of foundations over finished ground surface shall normally be:

- Foundations for transmission pole structure - 300 mm.- Foundations for structures for switchgear equipment - 200 mm.- Transformer foundation - 300 mm

Foundations for switchgear apparatuses, the steel structure foot, shall be attached to foundation by adjustable nuts above the foundation.

13.2.12 Foundations for Steel Structures and Stay Anchors

Foundations shall be designed according to SS-EN 50423, chapter 8 ”Foundations”.

All exposed top surfaces of foundations shall be performed to avoid any standing water after rain etc.

All structures for equipment shall be based on foundations by adjustable bolts (bolt with double washer and nuts).

13.2.13 Foundations in Soil

Foundations shall normally be placed on virgin soil or well compacted fill. Soil foundations shall be founded in frost proof depth – in this case 2.2 m according to SS-EN 50423, Figure 8.2/SE.1.1. ”Map over Sweden with frost proof depth in mineral soil without snow on ground”

Reducing the depth of the foundations by insulating may be acceptable subject to approval by NV.

NV require the Contractor to submit method statements for the installation of foundations and excavation of soil/ground

If excavation for foundation shows loose or running soil the bottom and sides shall be coated by placing a Geotextile of minimum “bruksklass N3” (NorGeoSpec 2002 classification system). Laying of geo fabrics shall be carried out in accordance to “Anlägnings AMA 07”, DBB.14.

Starting of concrete works shall not be carried out before inspection of shaft is done.

Backfilling for foundations shall be done according to “Anläggnings AMA 07”, CEE.31

13.2.14 Grid and Earthing Transformer Foundations (Transformer Oil Pits)

The Contractor shall design and construct suitable transformer foundations to carry the loading from the oil filled Grid transformers and the auxiliary earthing transformers and


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provide oil containment in case of leakage for the Grid transformers and the auxiliary earthing transformers.

The foundations for the transformers shall be designed according to SS-EN 61936-1 in form of an open rectangular concrete box with the transformer placed on rails/beams supported on at least two intermediate buttress walls. The box shall be equipped with a grating floor to enable possible leaking transformer oil to flow into the concrete box.

The grating floor shall have a 250 mm (minimum) thick layer of carefully washed gravel, rise of moisture max 15 cm according to SS-EN 1097-10, stone size 35-70 mm. The Contractor may offer an alternative design utilizing a concrete grating floor that is a fire stopper and a grating floor in one unit. If this alternative is offered then the Contractor shall provide details to the employer for agreement.

The concrete box shall be able to collect all oil from the transformer + 300 mm rain water. The foundation box shall be equipped with an oil separating pit for pumping out oil and rainwater. The pit shall be arranged with an automatic system for alarming occurrence of oil or high water level in the pump pit together with pump fitted oil guard.

All steel moulded or mounted in the oil pit shall be galvanized.

Under the oil pit there shall be ground insulation in requisite extent.

In connection to the transformer foundation shall also be constructed an area for unloading the transformers and further sliding the transformers on prepared sliding beams to its final position on the transformer foundation. The unloading area shall be designed area according to the similar demands as the transformer road. The area shall be large enough for future storage and transportation if the transformer has to be exchanged to another. The aforementioned areas (designed for heavy transports/lifting works) shall by The Contractor be clearly marked on the Substation layout drawings.

The bund wall around the transformer oil pits shall be at least 300mm above the local finished ground level to reduce risk of melt water draining into the bund itself. The height shall be suitable for offloading the transformer with the use of sliding beams.

Separation of the two transformers at Sidensjö South substation shall be in accordance with the recommendation of SS-EN 61936. If sufficient separation distance cannot be achieved, a suitable fire protection wall shall be built between the transformers, in accordance with the requirements SS-EN 61936.

13.2.15 HV Equipment Foundations

The Contractor shall design and install all foundations for the busbar/conductor supports, disconnectors, cable sealing ends, CT’s, VT’s, CB’s, surge arrestors etc. to be installed in the HV section of the sub-station compounds and under the separately supplied over head line if supports are required at this point. These shall take into consideration all static and dynamic loads the equipment may be exposed to.

13.3. Buildings

13.3.1 General

Buildings shall fulfil the demands according to “Boverkets byggregler BBR” (building regulations BBR).

Control Buildings shall be built at the site and form part of the wind farm substation compound.


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The building structure shall be appropriate to the conditions encountered at Sidensjö.

In the buildings there shall be as a minimum room for:

- Switch room for 33 kV switchgear- Room(s) for protection, control equipment, power supply and telecommunication - SCADA room(s) for Wind Turbine SCADA and for Wind Farm SCADA - Battery room- Workshop/Store - Toilet- Meeting room - Kitchen facilities- Accommodation- Chemical storage (COSHH store)

NV have compiled a listing of room requirements and ground loadings which shall be used for both substations at Sidensjö North and Sidensjö South. The Contractor shall refer to this document, NV ecm reference:- Sidensjö EPC Specification Part IX – Service and Maintenance Provisions ecm reference 01986-007191. The Contractor shall consider the detailed floor loadings and ensure the ground in the areas outside of the required doors is adequately rated for the loads and the vehicles required for on/off loading these panels etc. The Contractor shall review the requirements and submit to NV a listing detailing ground bearing requirements across the substation area and access roads to the substation. A minimum ground bearing capacity of 200kPa shall be required by NV around the substation building with the Contractor increasing this as and where required.

The Building shall be placed at the fence with the outside wall as part of the fencing. There shall be installed a separate entrance door from the outside of the area to the SCADA-room.

The level of the walking floor shall be above the ground level outdoors to avoid flooding.

If the building is constructed as a prefabricated building the manufacturer shall state it in the offer.

The building shall be intruder protected according to SSF 200:4, “Skyddsklass 2” (security class 2). This shall be complete with all door monitoring switches, Passive Infra Red detectors etc. The system shall be interfaced into the SCADA, HMI and telephone system to generate alarms that can be sent to the control centre.

Calculations of material strength with regards to pressure increases at electric arc short-circuit shall be presented for buildings which contain open air insulated switchgear.

Note:It shall not be possible to enter a 33kV or HV compound or area via normal operational doors.

In the contractor’s design of the layout/disposal for the Substation control building the Employers requirements shall be consider including turbine suppliers requirements set out in the Siemens specification document (Document to be provided by NV, 01986-009122). As a consequence thereof the following is required with regards to the planning and design of the control building;

Layout;

a) For non HV-voltage authorized personnel the SCADA room, spare room, and welfare facilities such as kitchen and toilets within the control building shall be accessible without entering the 33kV or HV areas in the substation compound


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b) The doors in (a) shall be arranged to meet requirements on logistics and transports of equipment set out in those rooms during installation and operation of the substations and wind farm

c) Any doors from the SCADA-room to the control- or HV-areas/ switchgear room shall be equipped with a cylinder lock restricting non HV-voltage authorized personnel from entering HV-areas.

d) Environmental requirements of equipment and personnel shall be considered when arranging the substation layouts

e) The Contractor shall provide all cylinders and keys for the works and shall present a locking scheme (For the Employer’s approval) to meet the requirements in a) to d) before install the locks.

f) The gradient of finished floor level must meet the requirements of all plant items.

13.3.2 Particular Turbine SCADA Room Requirements

The Contractor must allow for the installation requirements of the Siemens Turbine Control and SCADA panels as detailed in Siemens document, Siemens SCADA Facility requirements NV Data base reference 01986-09122.

13.3.3 Particular Switchgear room Requirements

The 33kV switchgear room must be designed to ensure that the content of free gas released in the loss of SF6 from the largest enclosure does not exceed 10% of the switchgear room by volume.

Over pressure exhaust channels shall be arranged from the switchgears cubicles and be routed directly from the switchgear through the buildings outer walls for pressure relieve in event of occurrence of over pressure caused by electrical shortcuts in the switchgear

13.3.4 Building Permit and Announcements

Buildings shall be designed for approval by the authorities, the granting of approval and the undertaking of any remedial work remains the responsibility of the Contractor.Building-permit documents shall be supplied to the Employer by the Contractor. Necessary announcements required by the building regulations shall be made by the Contractor.

13.4. Building Structure

13.4.1 Basement Foundation

To ensure accessibility during winter seasons, the Control Building shall be raised so that all entrance doors are located no less than 500mm above finished ground level of the station. The doors shall be provided with platforms. A stair cages equipped platform shall be arranged for along the building. The platform shall be large enough to allow the opening of doors while a person remains standing on the platform and allow for any transport of equipment into the building.

The basement slab shall be cast on a drainage layer of gravel according to the instructions of the deliverer of the building. It may be necessary to include a geotextile layer under the drainage layer. If suitable, soil resistant grade insulation slabs shall also be included.

If the ground conditions so require, pilling or other improvements of the soil shall be included.Outside the foundation slab shall be laid an earth wire around the foundation. The wire shallbe connected to the earthing net.


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A constructional drawing and a construction calculation for the foundation plate shall be approved by the Employer before any work with the slab is carried out.

13.4.2 External Walls

External walls shall be of concrete. Fire class minimum El60. When fire class is required this in general also applies for any installations part of the walls.

The outside facade shall be of a “maintenance-free” type, either of concrete with exposed ballast or facade plate. Colour shall be grey (preliminary). The building shall be equipped with protection against graffiti. Colour and surface type shall be approved by the Employer in consultation with the local building committee.

Outer wall to switchgear room shall if so is required be equipped with insulating decompression flaps with ducting to the switchgear compartments.

The Contractor shall make calculations regarding pressure and strength on account of short circuit for switchgear rooms. The calculations and actions taken shall be approved by the Employer.

13.4.3 Roof

The roof of the building shall be a ventilated ridged roof.

Fire class minimum EI60.

The external cladding of the roof shall be concrete tiles or galvanized steel sheet. The roof shall be constructed with requisite inclination for good drainage of rainwater, snow and ice. Eventual ventilation holes or air gaps under the roof shall be provided with mosquito nets. The roof shall overhang the external cladding of the building by a minimum of 600mm as protection against snow and ice fall.

For inspection, the roof section shall be provided with a lockable inspection opening and an inspection board.

Rainwater shall be led to the surroundings by gutters, rainwater downpipes and further on into the ground drainage system with surface water pipes etc. All metallic structures are to be suitably earthed.

The building shall be equipped with a lightning protection system.

Gutters shall be placed so they will not be damaged from falling snow and ice. The drainpipes shall be equipped with strains. The base of the roof, bargeboard, drainpipe and gutters shall be made in the same colour as the roof and be constructed of concrete tiles.

Snow slide guards shall provide roof facing against walking or parking area and entrance doors.The “takfot” shall be minimum 700mm to avoid snow fall on the ground adjacent to the platform on the entrance side of the building or outside the buildings emergency escape routes.

13.4.4 Floors

Floors shall be designed for minimum imposed load of 1500kg/m2.

False flooring shall be used for the switch-room, Control room, SCADA room and room for protection, control equipment, power supply and telecommunication. False flooring shall be placed 900 mm above the structural floor and 1200mm in locations where power cables enter the switchgear. The floor shall consist of easily demountable floor elements of the size


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approximately 600x600 mm. Stability and load-bearing power shall remain also when the floor elements are demounted. The elements shall be hard, electric insulating material resistant to fire and moisture. The supporting profiles in the false floor shall be hot dipped galvanized steel. The supporting frame shall be connected to the earthing system in two points. The false flooring shall be adapted to ducts and pipes passing through the panels and to permanent holes in the concrete. The concrete floor surface shall be dust-layered.

Tools for lifting the floor elements shall be included, minimum one per room and in the case where the room is longer than 10 m at least two.

The design shall make possible for all transportation during montage and maintenance work.In Battery room the floor shall be covered by semiconducting paint or linoleum of conductive or semi-conductive material that is connected to the ground. The floor material shall have good resistance against sulphuric acid from batteries.

Floor covering in other rooms shall be of linoleum with colour approved by the Employer.

13.4.5 Interior Walls and Ceiling

Interior walls shall be constructed with materials in fire class EI60 between different fire cells. Ceilings shall also be constructed for fire class EI60.

Refer to Employer document ‘Sidensjö EPC Specification Part IX - Service & Maintenance Provisions’ ECM 01986-007191 for details on the minimum fire cell requirements.

The Contractor shall prevent fire spreading between these individual fire cells/rooms via doors, ventilation or cable ways.

For the cases when instrument, control or communications cables are laid in the same cable way or vault as power cables they shall be installed on separate cable tray or ladders. All cable passages between different fire cells shall be fire sealed at the wall passage.

Walls and ceilings shall be smooth, primed and finish panted in a colour approved by the Employer.

13.4.6 Doors

Doors shall have sufficient dimensions for easy transportation of relevant material though the open door way.

Doors shall be equipped in accordance with the requirements raised by its location e.g. is itinstalled in inner or outer walls, if it is between fire cells or protecting a fire cell it needs to be fire class EI60, if it is in a designated emergency route escape then it shall be suitably equipment to allow personnel to escape.

Outer doors are constructed in aluminium or steel (without door mirrors and glass sections) and shall be provided with a doorframe head of the type ASSA 180 or similar. The doorframe head for outer doors are provided, with a drip moulding. Outer doors shall be constructed in accordance with SS 81 73 45, Standard for burglary-protected doors.

Outer doors shall be provided with lock “Skyddsklass 2” according to SSF 200:4.

Evacuation door from battery- or switchgear room shall be smooth running and cannot be equipped with a door closer. All evacuation doors shall be provided with an emergency opener according to Swedish standard (SS 436 21 04) and be opened outwards.


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Outer door shall have opening armature. Opening armature shall be dimensioned to handle occurring wind loads. The door shall be equipped with a back-edge locking device and with canalization to the locking device. The canalization shall contain tension wire.

Outer doors are provided with cylinder lock and door handle of stainless steel. At entrances the stairs of galvanized grating shall be securely mounted.

Door(s) to the storage room shall be a double door to allow transportation of spares with one door used for personnel passing through. The entrance to the storage room shall be designed to allow for lifting of equipment from ground level or from transportation and movement into the storage area.

Refer to Employer document ‘Sidensjö EPC Specification Part IX - Service & Maintenance Provisions’ ECM 01986-007191 for details on the minimum door requirements.

The grating floor at transport doors shall be arranged for easy transportation of switchgear cabinets and other heavy equipment. The upper step at the control room entrance shall be large enough so the door can be easily opened from the outside.

Inner doors shall have fire class El60 for doors between different fire cells.

Phosphorescent signs for emergency exits marking shall be placed on the doors in accordance with AFS1997:11.

13.4.7 Keys

The Contractor shall propose an access level key system for all doors/gates, for the Employers approval, to prevent unauthorised access to the HV switch room and compound, control room, SCADA room, chemical storage and stores.

13.4.8 Windows

The outer wall in the welfare area shall contain a window located minimum 1200mm above finalized ground level. The window shall be equipped with shock sensors integrated in the Substation burglar alarm system. Suitable security such as iron bars shall be installed.

13.4.9 Decompression Flaps

If required the flaps shall be insulated minimum to the same value as the outer walls. The decompression flaps shall be placed on prescribed height and be protected against trespassing attempts according to SSF 200:4, “skyddsklass 1”. They shall be designed so they cannot be opened from the outside. For eventual function the flap shall stay in place and the current of air shall be aimed upwards. Above decompression flaps the base of the roof shall be protected with sheet metal for fire protection.

The decompression flaps shall be painted in a colour approved by the Employer. The flaps frame shall be provided with a drip moulding to prevent penetration by rainwater.

13.4.10 Thermal Insulation

Maximum allowed coefficient of thermal transmittance Ui (maximum) shall be:

- External walls 0,45 W/m2 °K- Roofs 0,30 W/m2 °K- Floors 0,30 W/m2 °K

It shall be observed that BBR 18 also require a maximum average value for all surface in a room/building.


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The U-values shall be given in the Tender.

13.4.11 Heating & Ventilation

Requisite equipment for heating the building shall be included to ensure the room temperatures are maintained indoors under the lowest outdoor temperatures as detailed in the Outdoor Environmental conditions. Separately mounted thermostats in each room shall be installed to regulate the heating in that room.

The heating system for the building shall be described in the Tender.

The ventilation and the temperature in the building shall be calculated to handle the installed apparatus. The temperature indoors shall not be allowed to rise above +30°C. The ventilation equipment shall be speed-controlled and equipped with filters. Ventilation openings shall be placed on such height that they will not be covered by growing plants or snow and shall fulfil the demands according to SSF 200:4“skyddsklass 1”. Ventilator grill should be designed with a covering mesh of maximum 30 mm and with a wire diameter of at least 3 mm. The fastening of the grill to the wall shall be in accordance with SSF 200:4 “skyddsklass 1”.

For battery room and SCADA room(s), the temperature all-the-year-round shall be +20C, with a maximum deviation of 2C. Arranged battery rooms shall follow the demands in SS 408 01 10 – Rechargeable batteries – Formation and ventilation and be equipped with a the appropriate type of exhaust ventilation fan. If the air is taken from an adjacent room, the vent opening shall be provided with fire damper that closes at a fire alarm and brings the fan to a stop. Battery room ventilation shall also have a function for rapid charge interlocking this control shall be sourced from monitoring air-flow via a ventilation flow sensor. The fan is controlled with a thermostat set to 20º C. The fan shall be explosion-proof and provided with a disconnection switch. The fan operation shall be monitored and if a failure occurs an alarm shall be displayed via SCADA and charging of batteries controlled accordingly.

A central unit shall be installed for the ventilation plant and the cooling systems containing a control unit alarm/display table for monitoring of plant and alarms trigged from any parts of the system(s). From the central unit a single summary alarm shall be displayed in the Substation SCADA system.

The ventilation system shall be controlled form the fire detection control unit. On detection of a fire the ventilation system shall be controlled accordingly.

The ventilation system shall satisfy the requirements in the Siemens document below:

- Annex 5.3.1 (iii) - SCADA Facility Requirements. NV ecm reference 01986-009122

The O&M and as build information for the Heating, Ventialtion and cooling system shall contain a functional description (Sw. Driftkort) for the O&M overview of the system(s).

13.4.12 Water Supply & Sewerage

The building shall be provided with drinking water supply and sewerage.

The Contractor shall be responsible for connection to a by the Employer provided sewage system, with the connection point within 100 meter from the substation.

The contractor shall be responsible for supplying of water by connecting to a drilled well provided by the Employer within 100 meter from the substation. Installation of New Pump and Supply of Permanent Electricity for the pump shall be the contractor`s responsibility. That shall also include monitoring of function with suitable alarms.


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All facilities have to be clearly marked out in the terrain for O&M purpose.

13.4.13 Fire Protection

The building shall be equipped within each room a portable fire extinguishers 5 kg with carbon dioxide as the extinguishing medium. The transformers shall be placed and arranged so requisite cooling will not be restrained and the risk for fire or other damages in the surroundings are prevented in a reasonable extent.

Particular precautionary measures to reduce the risk of fire are stated in the High voltage handbook.

Making of holes in sectionalizing walls shall be made with fire seal according to the same fire resistance class as the wall itself.

13.4.14 Fire protection Documentation

The Contractor shall prepare the Fire Protection Document according to advice given by "Räddningsverket". The documentation shall describe items according to table (example).

Buildings and installations

1. Fire cells, fire-resistance grades

2. Escape routes, positions and type

3. Fire protection installations (sprinkler, alarm system, fire gas ventilation)

4. Fire protection of the ventilation system

5. Protection against fire distribution within fire cells and between fire cells.

6. Bearing capacity in case of fire.

7. Drawings related to fire protection

Organizational 1. Instructions for maintenance and inspection (interval and responsible

2. Responsibility distribution. Responsible persons shall be stated by names etc.

3. Presentation of all external inspections (alarm system, fire inspection, etc.

4. Training and education routines for personnel.

5. Furnishing and activity limits.

6. Fire prevention actions- work with flammable goods- work in hot environment presenting a fire

hazard - order and safety regulations

Table: Contents of the Fire Protection Documents.

13.4.15 Interior Fittings

In the entrance there shall be:

- One hat/coat rack

In the control room there shall be:


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- 1 desk for PC workstation and printer (working area to be located away from noise sources such as computer servers)

- 2 desk chair- 2 ordinary chairs- 1 writing pad- 1 archive cabinet for drawings and other documentation- 1 bulletin board- 1 table with wheels strongly built, with two levels- 1 wastepaper basket- 4 no (minimum) double domestic style sockets for PC, printer, laptop use etc. near

workstation unless Siemens documentation exceeds these requirements- 3 no telephones and 3 no internet data points including communication network (Cat 5e)

terminated to a network distribution frame interconnecting to the Employers telecoms.

In the Turbine SCADA room there shall be:

- 1 no telephone and 3 no internet data including communication network (Cat 5e) terminated to an network distribution frame interconnecting to the Employers telecoms.

- 4 no (minimum) double domestic style sockets for PC, printer, laptop use etc. unless Siemens documentation exceeds these requirements

In the office rooms there shall be:

- 2 no telephones and 2 no internet data points

In the battery room there shall be:

- Shower for eyes with a rack containing five bottles.

In the switchgear room there shall be:

- Arranged place for working tools (earthing tools etc.).

In the kitchen room (meeting area/canteen) there shall be

- (trinette-unit) consisting of water/sewage supply, refrigerator, two plates for heating food, one microwave oven. The unit shall be controlled via an enclosure timer (For fire protection)

- Above the trinette a wall mounted enclosed cabinet (with door) for kitchen accessories - 1 no telephones and 1 no internet data points

In the workshop room there shall be:

- 1 no telephones and 1 no internet data points

Over-all:

- Escape routes shall be marked on floors and doors by luminous paint

Also refer to Employer document ‘Sidensjö EPC Specification Part IX - Service & Maintenance Provisions’ ECM 01986-007191 for details on the telecom and internet data port pointsrequirements.

13.4.16 Documentation & Drawings

The Contractor shall provide O&M Manuals and as build information in accordance to AFD.242 and as indicated (but not limited to) in the O&M Register)


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The documentation shall in addition to above include:

- Drawing showing the building layout plan (coordinating of ground services and constraints).

- Technical specification of the building structure.- Building Operation Manual including maintenance specification for all services within the

substation, to include but not limited to, civil, ground works, ventilation, plumbing, sewage, water, kitchen equipment.

- Calculations to verify the Contactor’s design with respect to loading capability of roads, ground and structures with respect to all materials (such as grid transformer) transported to the site.

- A ground layout drawing showing load bearing capacity for all areas to allow lifting plans to be made during construction, installation and throughout the operating lifetime of the substation.

13.5. Fire Detection System

13.5.1 General

The fire alarm system shall be designed according the regulations SBF 110:6 (Rules for automatic fire alarm system) issued by “Svenska Brandförsvarsföreningen”.

In order for an outbreak of fire to be rapidly discovered, the substation is to be equipped with an automatic fire alarm monitoring device in the control building.

The fire alarm devices shall monitor all spaces in the areas concerned. The detection system shall also be connected to the Substation SCADA system for the signalling of alarm and warning signals.

In the event of an outbreak being discovered, a fire alarm signal is to be transmitted:

- Locally in all buildings- To the remote control centre to be advised during the construction phase- To the auxiliary alarm unit

The fire alarm device must be designed in such a way that:

- It operates automatically, i.e. itself discovers and indicates an incipient fire- It is self-monitoring, i.e. important functions are monitored in such a way that a fault

affecting the function of the installation triggers off a fault alarm which is indicated locally and in the monitoring centre.

- Ventilation etc. shall be controlled by fire alarm for vent closing etc.- Alarms and trip signals shall be initiated and transferred to a remote emergency centre or

the party acting under the rules of the plant Eldriftansvar. A back up transmitter shall ensure the alarm is transferred in the event the normal route is faulty.

13.5.2 Design

The fire alarm installation consists of:

- A central alarm and monitoring Control panel/apparatus - All sub-centres where needed- Detectors and alarm buttons- Outdoor areas including pipes- Power supply equipment


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- Alarm signal devices- Alarm transmission equipment

Detectors are to be connected to the fire alarm centre in such a way that, in the event of an alarm being given, the fire alarm centre will clearly indicate where the fire has started. In the case of fire, indication shall be given in which fire cell the fire is detected.

13.5.3 Central Control Panel/Apparatus

The central control panel/apparatus is to be located in a lockable cabinet and shall include the requisite equipment for the following and other purposes:

- Monitoring of detector circuits and the power supply- Indication of fire alarm and fault alarm- Further transmission of fire alarm and fault alarm- Control of external equipment - Control of local acoustic alarm signal devices- Disconnection of detector sections without other sections being affected

The front of the central apparatus must be provided with optical indications showing, among other things:

- That a fire has started- From which detector section a fire alarm is indicated when a fault has developed in the

fire alarm device

The central apparatus shall be provided with the requisite devices for checking the following, among other things:

- The alarm device of the central apparatus in the event of an alarm or fault in the detector section

- Earth faults- Local alarm signal devices

The central apparatus is to be placed close to the main entrance to the control building.

13.5.4 Detectors and Alarm Buttons

The main principle for fire detection shall be smoke detection. Heat detectors are only allowed where smoke detectors are unsuitable. Also flame detectors can be used if applicable.

Manual alarm buttons are to be provided in the following places, among others:

- Next to the central apparatus- On all emergency evacuation routes

13.5.5 Alarm Signal Devices

For the purposes of alarm signalling, the buildings are to be equipped with the requisite signalling devices, e.g. alarm bells, emitting a clearly identifiable signal in the event of an outbreak of fire.


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14. ANNEX 6 – TECHNICAL SPECIFICATION - STEELWORKS

14.1. General

This Annex is valid for the substation structures that shall include, but not be limited to towers, gantries or equipment support structures carrying phase conductors and earth wires inside the switchyard fence and supports for the electrical apparatus such as circuit breakers, surge arresters, disconnectors, harmonic filters and reactor.

If applicable, the conductors and earth wires connected to the dead end tower in the transmission line shall also be covered by this part.

14.2. General Design Criteria

The structures shall be of (bolted or welded) beam, tube or lattice type. All steel shall be galvanized. All structures shall be bolted to concrete foundations above ground. In case non-magnetic structures are needed, they shall be manufactured of suitable aluminium alloys.

All columns and beams shall be designed to withstand full one-sided unbalanced conductor and earth wire pull, i.e. no relief pull from conductors and earth wires in adjacent bays shall be considered.

14.3. Loads

14.3.1 Load Cases and Load Combinations

Load cases and load combinations shall be calculated in accordance with SS 421 01 66 "Mechanical design of outdoor substations".

14.3.2 Wind and Ice Load

Wind and ice load shall be calculated in accordance with SS 421 01 67 "Design of outdoor substations - Wind and ice loads". The reference average wind speed shall be vref = 23 m/s and the terrain type shall be III. The most unfavourable wind directions shall be considered.

14.4. Material, design and fabrication

14.4.1 Structural Steel

Material, design and fabrication of structural steel shall be in accordance with BSK 99, "Boverkets handbok om stålkonstruktioner". For lattice steel structures, sub-clauses J.6, J.7 and J.10 from Annex J in SS-EN 50341 also shall be considered.

14.4.2 Galvanizing

All ferrous parts shall be galvanized, except where otherwise specified. Galvanizing shall be executed in accordance with SS-EN ISO 1461 with coating thickness according to Table 2 for structural steel and SS-EN ISO 10684:2004 for bolts, nuts and washers. External threads shall be undersized according to SS-ISO 965-4.

14.4.3 Structural Aluminium

Material, design and fabrication of structural aluminium shall be in accordance with BKR, "Boverkets Konstruktionsregler", chapter 9.


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14.4.4 Bolted Connections

For bolted connections generally shall the requirements of BSK 99 be full filled. The bolt connection class shall be S1 in accordance with BSK 99, chapter 8:15. Bolts for high shear forces shall comply with BSK 99, chapter 8:53.

14.4.5 Lattice Structures

The maximum allowable slenderness ratios in lattice steel members shall be as follows:

- Member type (l/i)- Compression members:

- Main legs 120- Other members 200- Redundant members 240- Tension members: 350


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15. ANNEX 7 – EXTRACT FROM EPC SIDENSJÖ ELECTRICAL SPECIFICATION, APPENDIX A, ECM 01986-007083.

15.1. GRID TRANSFORMER

145kV/33kV/0.42kV YN/d11/yn0 (3 winding), Wind Farm Generation Substation Transformer.

Transformers to be complete with on-load HV tap changer with +15% to – 15% voltage range on nominal tap.

The required Grid Transformer auxiliary supplies are to be taken directly from a 420V winding to form a self contained system provided as part of the Grid Transformer scope. In addition, the wind farm substation 420V auxiliary supplies shall be provided by the integral Grid Transformer auxiliary winding and transformer.

15.1.1 General Ratings

(a) Primary Manufacturing Standard: TR1-10, SS-EN 60076(b) Type: Three phase oil immersed(c) Operation: Continuous(d) Um: 170/36/0.45 kV(e) Rated voltage with tapping range: 145kV+/-9x1.67%/33kV/0.42+/-5% kV (f) Insulation test voltages 145kV side: LI 550kV AC 275kV(g) Insulation test voltages 33kV side: LI 170kV AC 70kV(h) Insulation of Neutral: LI 250kV AC 95kV(i) Neutral Bushing Lightning Impulse Level (BIL): 250kV +10%(j) Rated Power: 63 MVA / 63 MVA / 0.25 MVA(k) Connection symbol: YNd11yn0(l) Type of cooling: OFAF(m) Guaranteed No-load Loss: 27kW @ 1.0pu voltage(n) Guaranteed Load Loss: 320kW @ 63MVA(o) Type of oil: Nynas Nytro 10XN

15.1.2 Ratings for 145kV

(a) Application: Wind Generation Output (Outdoor)Active power flow from 33kV to145kVReactive power flow in both directions

(b) Energisation: Always to be from HV terminals(c) Frequency: 50Hz(d) System Earthing: Solid earthed star point(e) Highest Voltage for Equipment (Um): 170kV(f) Lightning Impulse Withstand Voltage : 550kV (g) Short-Duration Power Frequency Test Voltage: 275kV(h) Short-time withstand current 31.5kA(i) Peak withstand current: 79kA(j) Duration of short circuit design criteria: 1 second(k) Minimum creepage distance in air: 31mm/kV (min total 4800mm)(l) HV Bushing Lightning Impulse Level (BIL): 550kV + 10%

15.1.3 Ratings for 33kV

(a) Frequency: 50Hz(b) System earthing; Impedance earthed


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(c) Highest Voltage for equipment (Um): 36kV(d) Lightning Impulse Withstand Voltage: 170kV(e) Short-time withstand current: 25kA (f) Peak withstand current: 63.5kA(g) Duration of short-circuit design criteria 1 second(h) LV Bushing Lightning Impulse Level (BIL): 170kV + 10%

15.1.4 Ratings for Low Voltage Winding and Equipment

(a) Frequency: 50Hz(b) System earthing: Star point solidly earthed(c) Rated phase to phase voltage; 420V(d) Rated Phase to earth voltage; 230V(e) Protection class for indoor equipment; IP23(f) Protection class for outdoor equipment panels: IP55

Note The low voltage winding shall be for the Grid Transformers own auxiliary loads and for the wind farm substation auxiliary loads.

15.1.5 Transformer Monitoring

The transformer shall be provided with a comprehensive transformer monitoring package to provide continuous monitoring of all key transformer parameters, including but not limited to:

(a) Ambient air Temperature (b) HV Winding Temperature(c) MV Winding Temperature(d) Main Tank Oil Temperature(e) Tap Changer Oil Temperature (f) Oil Level(g) Moisture in oil Analysis(h) Dissolved Gas in oil Analysis

The above are to be provided as inputs to the substation SCADA system. These signals shall be derived from instrumentation mounted on or in the transformer, to provide these monitoring signals. This monitoring unit shall be an integral part of the Grid Transformer scope of supply.

15.1.6 Automatic On-Load Tap-Changer (OLTC) Control System

To include the following features:

(a) On-Load Tap Changer (OLTC) Location: HV-connected, separate / isolated compartment design, attached external to main transformer tank.

(b) On-Load Tap Changer (OLTC) Tapping Control: On-load, with manual & automatic control with provisions for remote operation.

(c) 1 Automatic Tap-Changer Relay: Required (d) 1 Voltmeter: Required(e) 1 Tap Position Indicator: Required(f) Local/Remote Control Switch: Required(g) Manual Tap Up & Down Control Switch: Required(h) Tap Change in Progress Indication: Required(i) Tap Change Completed Indication: Required(j) Tap Change Lock-Out Indication: Required


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(k) Serial interface communication facility to accept remote control & monitoring: Required

(l) Auxiliary voltage: 110V DC(m) Tap Changer Counter: Required(n) Tap Changer Motor Auxiliary Voltage: 420 / 230V AC, 50 Hz.

15.1.7 Terminal Equipment and Features:

(a) Core Grounding Bushings: Required, four bushings - one for core, one for HV side core frames (top & bottom together) and one for 33kV side core frames (top & bottom together). One required for LV winding in LV cable box

(b) 145kV/33kV Terminal Configuration: Opposite sides of tank

Note. The Grid Transformer terminations to be agreed and co-ordinated by Contractor with the subcontractors used for the substation design and build

(c) Substation & Foundation Detail: Flat concrete stand

(d) 145kV Phase Terminal Equipment:

Winding Terminal: 145kV Phase Terminals Equipment: External Weatherproof Bushings Principle Manufacturing Standard: TR1-10 & SS-EN/IEC Type of Termination: Stud connector. No. of Conductors: 3 Conductor Material: Copper Only Conductor Type: Stranded, solid or tubular Conductor Phase to be marked L1, L2 and L3

(e) HV Neutral Terminal Equipment:

Winding Terminal: 52kV Neutral Terminal Equipment: External Weatherproof Bushings Principle Manufacturing Standard: TR1-10 & SS-EN/IEC Type of Termination: Stud connector. No. of Conductors: 1 Conductor Material: Copper Only Conductor Type: Stranded, solid or tubular Conductor Neutral to be marked N1

(f) 33kV Phase Terminal Equipment:

Winding Terminal: 33kV Phase Terminals Equipment: External weatherproof cable box, suitable for

multiple cable connections from below Principle Manufacturing Standard: TR1-10 & SS-EN/IEC Type of Termination: Suitable for multiple single cored cable

connection and to include cable supports No. of Conductors: To be confirmed Conductor Material: Copper or aluminium Conductor Type: Stranded, solid or tubular Conductor


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Phases to be marked 2L1, 2L2 and 2L3

(g) 420V Phase Terminal Equipment:

Winding Terminal: 420V 3 phase, neutral & earth Equipment: External weatherproof cable box, suitable for

multiple cable connections from below Principle Manufacturing Standard: TR1-10 & SS-EN/IEC Type of Termination: Suitable for multiple single cored cable

connection and to include cable supports No. of Conductors: To be confirmed Conductor Material: Copper or aluminium Conductor Type: Stranded or solid Conductor Phases to be marked 3L1, 3L2 and 3L3. Neutral and earth to be marked PEN

15.2. HV DISCONNECTING CIRCUIT BREAKER

Primary Manufacturing Standards: IEC 62271-1 for general purposes.IEC 60071-2 for the insulation coordination.IEC 62271-108 for the disconnecting circuit-breakers for rated voltages of 72.5 kV and aboveIEC 60529 for degree of protection.

Application: Wind Generation Output Location: OutdoorsType: Live Tank Disconnecting Circuit BreakerOperation: Stored Energy, 3 Gang MechanicalOperating HV system voltage: 145kVMaximum HV system voltage: 170kVNo. Phases: 3-Phase, 3-WireFrequency: 50 HzCircuit Breaker Interruption Medium: SF6Circuit Breaker Continuous Current Rating: 1250 AmpsShort Circuit Rating: 31.5kADuration of short circuit design criteria: 3 secondPeak withstand current: 79kAPower Frequency Withstand: For Isolating Distances – 315 kV (rms)

Phases & to Earth – 275kV (rms)Lightning Impulse Level: For Isolating Distances – 750 kVp

Between Phases & to Earth – 650 kVpNumber of Trip Coils: 2 off per CB 2 off separate coils to be installed in each CB

(a) Coil 1 powered from Primary Battery Supply, normal operation – 110V DC Nominal

(b) Coil 2 powered from Secondary Battery Supply, normal operation – 110V DC Nominal

Trip/Close Operation: Mechanical & ElectricalTrip/Neutral/Close Switch: RequiredTrip Coil Voltage: 110V DCLocal Manual/Remote Supervisory Switch: RequiredSpring Charging: Manual Mechanical & Automatic ElectricalSpring Release Coil Voltage: 110V DCAutomatic Closing Spring Motor Voltage: 110V DC or 230V ACFuses & Links: As required


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Operation Counter: Required. Non-re-settableCircuit Breaker Key Interlock: RequiredCircuit Labels: RequiredSafety Interlocks: RequiredPad Locking Facility: Required for all switch positionsSecondary Wiring Access: Via Pad Lockable Door fitted with Door

Operated Lamp 230V AC 50 HzAnti-Condensation & Anti-Freezing Heaters: 230V AC 50 HzAnti-Pumping Relay: RequiredLoss of AC & DC volt alarms: RequiredType of Primary Termination: Bolted conductor compression terminalsPrimary Busbar Conductor Material: Aluminium or CopperPrimary Busbar Conductor Type: Stranded Conductor or Tubular Busbar

15.3. MV SWITCHGEAR PANEL

Primary Manufacturing Standards: IEC 62271-1 for general purposes.IEC 62271-200 for the switchgear.IEC 62271-102 for the earthing switch.IEC 60071-2 for the insulation coordination.IEC 62271-100 for the circuit-breakers.IEC 60529 for degree of protection.

Application: Wind Generation OutputLocation: IndoorsType: Metal-enclosed SwitchgearArc-proof: RequiredNominal Voltage: 33 000 VRated Voltage: 36 000 VNo. Phases: 3 Phase, 3 WireFrequency: 50HzSystem Earthing: The design shall be a dedicated 33kV

earthing transformer with current limiting NER that shall be installed at the wind farm substation

Busbar Arrangement: Single BusbarBusbar Continuous Current Rating: 2000 AmpsCircuit Breaker Interruption Medium: SF6/VacuumCircuit Breaker Continuous Current Rating: 2000 Amps for Grid IncomerCircuit Breaker Continuous Current Rating: 630/1250 Amps for other feedersCapacitive Current Switching Capability: As per IECShort Circuit Rating: 25kA for 3 Sec

Break - 25kAMake - 63kA Peak

Out of phase switching: As detailed in IEC 62271-100, clause 6.110Power Frequency Withstand: For Isolating Distances – 80 kV (rms)

Phases & to Earth – 70kV (rms)Lightning Impulse Level: For Isolating Distances – 195 kVp

Between Phases & to Earth – 170 kVpNumber of Trip Coils: 2 off per CB 2 off separate coils to be installed in each CB

(c) Coil 1 powered from Primary Battery Supply, normal operation – 110V DC Nominal

(d) Coil 2 powered from Secondary Battery Supply, normal operation – 110V DC Nominal

Trip/Close Operation: Mechanical & Electrical - lockableTrip/Neutral/Close Switch: Required – lockable


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Local/Remote Switch: Required - lockableTrip Coil Voltage: 110V DC Trip Coil Power Rating: Maximum 350 WattSpring Charging: Manual Mechanical & Automatic ElectricalSpring Release Coil Voltage: 110V DCSpring Release Coil Rating: Maximum 350 WattAutomatic Spring Charging Motor Voltage: 110V DCFuses & Links: As requiredCable Access: Bottom EntryBlanking Plugs if requiredCable Termination Type: Inner Cone Separable ConnectorsAnti-Vermin Guards: Required for all cable entriesFeeder Circuit Earthing Facility: RequiredBusbar Earthing Facility: RequiredCircuit Labels: Required Safety Interlocks: RequiredPad Locking Facility: Required for all switch positionsBusbar Test Facility: Required for Primary Current & Voltage Test

Injection may be provided via outgoing feeder circuits

Circuit Test Facility: Required for Primary Current & Voltage Test Injection

Circuit Surge Arresters: Size and type to be determined by Contractor from insulation coordination study.

Secondary Wiring Access: Via Pad Lockable Door fitted withDoor Operated Lamp 230V AC

Anti-Condensation Heaters: 230V AC (if required)Anti-Pumping Relay: Required

15.4. PROTECTION AND CONTROL

The protection system will comply with the latest requirements of the appropriate GridCode (SvKFS2005:2) and connection conditions as applicable.

The protection system shall include the following protection schemes as a minimum:

Transmission Line Protection: Primary: Feeder Current Differential over fibre optic (OPGW) communicationsBackup: 4 Zone Distance with fast Zone 1 & 4 and time delayed Zone 2 / Zone 3

Over Voltage – Surge ArrestersHigh Side AMP Protection - Monitor High-side, Trip low-side:

Over VoltageUnder VoltageOver FrequencyUnder FrequencyFrequency Deviation

Transformer Protection: Bias DifferentialHigh-side Over-current & Earth FaultLow-side Over-current & Earth FaultTertiary-side Fused or MCCB protectionTertiary-side Restricted Earth FaultHigh-side Standby Earth FaultMain Tank BuchholzTap-Changer BuchholzWinding TemperatureOil TemperatureOver-Pressure


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High-side Overvoltage – Surge ArrestersLow-side Overvoltage – Surge Arresters

33kV Busbar Protection: Current Differential33kV Neutral Earthing Transformer Protection: Over-current & Earth Fault

High-side Standby Earth FaultLow-side Fused or MCCB protectionLow-side Restricted Earth FaultOvervoltage – Surge Arresters

33kV Feeder Protection: Over-current & Earth FaultOvervoltage – Surge Arresters

33kV Reactor Protection: Over-current & Earth FaultOvervoltage – Surge Arresters

33kV Harmonic Filter Protection: Over-current & Earth FaultOvervoltage – Surge Arresters

Each grid transformer shall be fitted with an independent local automatic control system to tap the high-side connected on-load tap-changer, to regulate the low-side busbar voltage.

Each 33kV reactor shall be fitted with an independent local automatic switching control system that will switch the reactors IN or OUT relative to the associated local grid transformer 33kV active (MW) power flow. The reactors will only be switched in during Zero/Low active (MW) power flow conditions.

During active power generation overall project reactive power flow at the Moliden point of connection shall be regulated through the turbine supplier’s grid monitoring station via CT and VT signalling taken at the Moliden point of connection.

15.5. 33kV EARTHING TRANSFORMER

The earthing transformer will be designed and tested according to the applicable technical guidelines TR1-10E and SS-EN 60076.

a) Three phase oil isolated transformerb) Connection group ZN0yn11c) Rated current 100A (58 A per phase) for continuous operation.d) Rated voltage 33 kV (Um = 36kV) / 420 Ve) Guaranteed no-load loss of ≤1kW @ 1.0pu voltagef) Rated secondary power - minimum of 250kVA, but to be equal or greater than the

auxiliary supply provided by the 130/33kV grid transformer. g) Zero sequence Z max /phase to be determined by Contractor in consideration to

overall system design and 33kV system limited earth fault current to approximately 100A (with 33kV reactor disconnected).

h) Temperature and pressure instruments shall be available

15.6. 33kV REACTOR

The 33kV reactor will be designed and tested according to the applicable technical guidelines SS-EN 60289.

i) Three phase shunt reactorj) Rated voltage 33 kV (Um = 36kV)k) kVAr Rating

a. Sidensjö North: 1x 3.15MVAr bank (*)b. Sidensjö South: 2x 2.33MVAr banks (*)

l) Quality ‘Q’ factor: 50


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m) Dedicated reactor switch per 3-phase reactor bank, be capable of switching the reactor for 100,000 operations before major maintenance is required

n) Control strategy: The control signal for switching these units IN/OUT shall originate from the 33kV MW level of the associated transformer (this item is to be determined at the detailed design stage) with the Reactor being switched IN upon the 33kV MW level reducing below a threshold setting, and the Reactor switching OUT upon the 33kV MW level increasing above a threshold setting. The appropriate control settings are to be determined by the Contractor with a sufficient dead-band/hysteresis range to ensure minimum optimized reactor switching operations.

(*) Preliminary kVAr rating, maybe subject to revision during detailed design stage

15.7. MV CABLE

i) Primary Manufacturing Specifications: IEC 60502ii) Installation Method: Direct Burialiii) Number of Conductors per Cable: Oneiv) Nominal System Voltage – Uo/U: 19/33kVv) Rated Voltage - Um: 36kVvi) Power Frequency: 50Hzvii) Conductor C.S.A. See 01986D4304viii) Conductor Material: See 01986D4304ix) Conductor Construction: Compacted, circular, stranded wirex) Max. Normal Operating Conductor

Temperature:90ºC

xi) Max. Short Circuit Conductor Temperature:

250ºC

xii) Longitudinal Conductor Water-Blocking: Requiredxiii) Insulation Material: Triple Extruded XLPExiv) Minimum Insulation Thickness: as per IEC 60502-2xv) Semi-Conducting Conductor Screen

Type:Fully Bonded

xvi) Semi-Conducting Insulation Screen Type:

Fully Bonded

xvii) Screen Material: Copperxviii) Screen Construction: Stranded Wirexix) Screen C.S.A.: As per applicable standard, but not less

than: 16mm2 - Conductor CSA ≤ 120mm2

25mm2 - Conductor CSA 150mm2 ≥ 300mm2

35mm2 - Conductor CSA 400mm2 ≥ 630mm2

xx) Max. Normal Operating Screen Temperature:

80ºC

xxi) Max. Short Circuit Screen Temperature: 200ºCxxii) Armouring: Not Requiredxxiii) Armouring Material: Not Applicablexxiv) Longitudinal Core Water-Blocking: Requiredxxv) Outer Sheath Material: MDPE (or equivalent)xxvi) Outer Sheath Colour: Black

15.8. FIBRE OPTIC CABLE

i) Fibre Type: Single Modeii) Core Diameter: 9μm


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iii) Cladding Diameter: 125 μmiv) Minimum Cores: 16

15.9. SCADA & COMMUNICATIONS SYSTEMS

The Contractor shall perform the detailed technical specification of the hardware comprising the wind farm SCADA and Communications System as shown on the SCADA & Communications Block Diagram (01986D4501) any applicable Swedish, IEC, European and local standards with SS-EN documents taking priority, thereafter CENELEC and then IEC/ISO.

The Contractor will ensure that the design of the wind farm SCADA and Communication System supports the performance requirements of the electrical system described herein and meets the necessary engineering and safety required for connection to the Grid Company’s system and in compliance with the WTG manufacturer’s requirements as specified in the Turbine Supply Agreement (TSA).
