subterranian gis substations

8/22/2019 Subterranian GIS Substations

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CopyrightSiemens AG

Energy Sector / High Voltage Substations

SubterranianGIS Substations


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1 Worldwide experience selected projects

3 Planned projects and conceptual solutions

2 Special requirements for underground S/S

4 Discussion

Presentation Roadmap


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1 Worldwide Experience Selected Projects


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Difficult locations for substations and transformers

S/S in French submarines Metro stationsHydropower stations Offshore wind parks

Sophisticated Projects


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Country: SwitzerlandClient: Stadtwerke St. GallenScope: 5 bays 110 kV GIS type 8DN9

15 bays MV, 24 kV NX Plus

2 x 25 MVA transformers

The substation is located in a stadium.It was a big challenge to coordinate theimplementation of the substation with theongoing work on site.Transformer openings are closed withprefabricated concrete slab, which can beremoved with reasonable effort.

St. Gallen Breitfeld

Switzerland, St. Gallen - Breitfeld


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Country: SwitzerlandClient: Stadtwerke St. GallenScope: 6 bays 110 kV GIS type 8DN9

2 x 40 MVA power transformers

110/10 kV each17 bays MV, 10 kV GIS

The Substation is integrated in a buildingcomplex and installed underground inlevel-3 and level-4. More than 250 t ofmaterials and equipment had to be cranedin to a point 15 m below ground level.In the building above is accommodated abank and the Switzerland institution for

material testing

St. Gallen Schochengasse

Switzerland, St. Gallen - Schochengasse


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Preparations for

offloading a 40 MVA

transformer

Transformer is lifted into

the foreseen opening

Transformer placed on

the rails and ready to be

pulled to final position

Schochengasse 110/10 kV SubstationProject Execution - Heavy Equipment Installation


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PavingPaving

Schochengasse 110/10 kV SubstationClosing Transformer Opening Outside


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ceiling

Removable slabRemovable slab

Schochengasse 110/10 kV SubstationClosing Transformer Opening Inside


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Data protection

Faraday Cage

People protection

Schochengasse 110/10 kV Substation EMIProtection


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Solutions Water CO2 Halon

Nitrogen Inergen

Schochengasse 110/10 kV SubstationTransformer - Fire Extinguishing System


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Fire Safe

Schochengasse 110/10 kV SubstationTransformer Separated


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Activation controlfrom the entrancefour floors higher

Activation controlfrom the entrancefour floors higher

Schochengasse 110/10 kV SubstationSmoke Extraction System


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Exhaust airExhaust air

EmergencyexitEmergencyexit

LadderLadder

Schochengasse 110/10 kV SubstationUtility Shafts and Emergency Exit


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Drainage systemin cable basement

Schochengasse 110/10 kV SubstationSprinkler System in Cable Basement


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Fresh air below transformer Fresh air under the ceiling

Schochengasse 110/10 kV SubstationHVAC Dust Protection


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Increased safetyIncreased safety

Schochengasse 110/10 kV SubstationTransformer - Encapsulated Termination


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Country: SwitzerlandClient: Stadtwerke Winterthur

The location is between school playground

and a motorway about 4m above. Thesubstation is used to equalize the heightdifference and to detain the noise from thecars.

The 2 storey building with cable basementhas an even access for transformers. Theother side is covered by the rising plot.

110/20 kV Substation -Wlflingen

Switzerland, Winterthur - Wlfingen


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WlfingenGround Plan


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Sound absorber

WlfingenNoise Limits Outside


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WlfingenPlayground Outside the Substation


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Side effect:heating systemcools transformer

WlfingenTransformer Cooling Devices


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WlfingenControl Room Special Design


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WlfingenIntuitive Guiding


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Country: AustraliaClient: TransGridScope: 25 x bays GIS type 8DN8/145 kV

4 x bays GIS type 8DQ1/362 kV330/132 kV transformer

The substation is integrated in a buildingcomplex in Sydney and is installed across2 above ground and 3 basement floorlevels

110/330 kV Substation -Haymarket

Australia, Sydney - Haymarket


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Haymarket 110/330 kV SubstationProject Execution - Deep Excavation


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app. 10 m,2 storey design

above ground

app. 22 m3 storey designbelow ground

foot print app. 30x60 m

Haymarket 110/330 kV Substation


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Haymarket 110/330 kV SubstationMain Equipment @ Basement 2


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Haymarket 110/330 kV SubstationSubstation Model


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Substation control & metering room

cable and auxiliary supply basementwith SF6 collection plenum

110 kV GIS 8DN8:25 bays (15 cable feeders),double bus bar

330 kV GIS totransformerconnection:GIB, 100% SF6 gas

Gas insulated transformer:330 kV 400 MVA SF6 single phasetransformers, no. 3 transformers intotal

330 kV GIS 8DQ1:4 bays, ring bus bar

Haymarket 110/330 kV SubstationArrangement of Equipment


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Floor Plan Basement 2 (Equipment Floor)

Haymarket 110/330 kV SubstationSF6 Gas Management


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Secondary SF6 plenum

Floor Plan Basement 3 (Cable Basement and SF6 Plenum)

Primary SF6 plenum

Haymarket 110/330 kV SubstationSF6 Gas Management


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Mainly under grounded substation in an urban environment

Main electrical equipment with gaseous insulation, thusavoiding fire hazards

Compactness due to latest GIS technology

Sophisticated SF6 gas monitoring with slow and fast gas leakdetection

Integrated control system enabling unmanned substationoperation

Haymarket 110/330 kV SubstationKey Features


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Country: MexicoClient: CFEScope: 6 x bays GIS type 8DN9

2 x power transformer 100 MVA

Substation in a park in the middle ofcommercial district.

Access ramp, AC openings and stairs arehidden behind landscaping.

132 kV SubstationFaro - Monterrey

Mexico, Monterrey - Faro


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Country: USAClient: City of Anaheim CAScope: 8 x bays GIS Type 8DN9 / 69 kV

2 x 69/12 kV 50 MVA

transformers20 x 12 kV panels

69/12 kV Park SubstationCity of Anaheim

United States, City of Anaheim Park Substation


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Park SubstationCovered by the Roosevelt Park


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Park SubstationS/S Entrance Design


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Park SubstationS/S Emergency Exit


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Country: SpainClient: CFEScope: 245KV, GIS 12 bays 8DN9

One of three Siemens undergroundsubstations in multistory buildings inMadrid.

Access via crane and open able duct

245 kV SubstationManuel Becerra

Spain, Madrid Manuela Becerra


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Country: SwitzerlandClient: Stadtwerke Winterthur

Underground substation under a

schoolyard in Winterthur.

Started May 2008

110/10 kV SubstationToessfeld

Switzerland, Winterthur - Toessfeld


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ToessfeldSection View of the Fully Undergrounded Substation


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ToessfeldSection View


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Less effort withsingle storeyundergroundbuildings.

Ongoing project inSwitzerland:Monitored withWebcam

ShoringShoring

SlopeSlope

ToessfeldSite Mobilization and Supervision


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2 Special requirements for underground S/S

1. Soil + Ground Water

2. Fire Fighting

3. HVAC

4. Emissions

5. Access


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Ground water tableSoil pressure

Crucial for design andcost

Soil and Ground Water


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/$

Ground WaterCost Impact


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Passive Fire Fighting

No flammable material.

2 separated ventilationsystems for transformersand building

Active Fire Fighting

Fire extinguish system

HSE Regulations

Emergency exit

No toxic materials (PVC)

Fire Protection ConceptFire Fighting


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Ventilation

Transformer separated fromother devices.

More space needed.

Humidity Avoid humidity by minimizing

air exchange

HVAC


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Noise

Inconvenient sound of HVAC-units and transformers

Electromagnetic

Too small vertical clearance topublic places or EDP

Emmissions


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Heavy Equipment

If possible transformers onground floor

Aesthetic

Architectural design ofvisible parts

Access


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3 Planned Projects and Conceptual Solutions

Planned Projects and Conceptual Solutions


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Section 1

Conceptual Solution Semi Underground


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Section 2

Conceptual Solution Semi Underground


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If the space between ground surface and water table is limited, the cable basement can be avoided.

Sample: U/G S/S Round House West Area P1,Toronto Hydro/Canada

Cable Basement & Cable Entry

Sample: Chorzow S/S, Poland

HV cables in horizontal position terminated

LV cables in cable tray above LCC cubicels

LV cable entry to LCC cubicles from the top


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In construction and technical design

8DN8-72.5 kV corresponds to switchgear

8DN8-145 kV, but is smaller

Bay Width: 800 mm

Conventional air-isolated type

How to cope with the problem of limited space?

Nx+C (11 kV GIS)

Use equipment with reduced space requirements

8DN8-72.5 (66 kV GIS)

Bay Width: 640 mm

Conceptual Solutions 66/11 kV GIS


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3 Possible Layouts

Underground S/S

Semi underground S/S

On top building

Hide as much as possible

2 levelsDesign necessary

Design Concept


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Possible Urban Situation

Substation surrounded by buildings

Park area, trees, plants, green

City square, plaza or parking area

Urban Situation Architectural Concept


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Design Solution on Top of Public Squares


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Waterfall Entrance

In park design water isan essential element.

HVAC - Acoustic Solutions for Parks and Sqares


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Cost impact (underground S/S in relation to conventional S/S)

Conventional S/S Underground S/S

12%100%Total costs

010lot1Services (design, installation and testing)

3407lot1Mechanical, electrical, plumbing (MEP) works

22lot1Landscaping

42517lot1Civil & structural works

33lot1Excavation

02lot1Earthing and lightning protection

08lot1LV cables and cable routing

016lot1SCS & CRP

06lot1LV service equipment

02lot1HV cables 66 & 11 kV c/w acc.

015Nos3Transformer 40 MVA and NER

04bays2811 kV switchgear

014bays1366 kV DBB GIS

TotalCosts of new items

in %Additionalcosts in %

%

Commercial Aspects (Preliminary Approach)


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Estimated execution time: 20 months per substation (subject to transformer delivery)

Project Execution Schedule


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Thank you foryour attention !

subterranian gis substations

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