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Dansk Standard DS/EN 61378-2 1. udgave Godkendt:2001-06-13

Omformertransformere – Del 2: Transformere til HVDC anvendelser Convertor transformers – Part 2: Transformers for HVDC applications

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DS-publikationstyper DANSK STANDARD udgiver forskellige publikationstyper. Typen på denne publikation fremgår af forsiden. Der kan være tale om: Dansk standard

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DS-betegnelse Alle DS-publikationers betegnelse begynder med DS efterfulgt af et eller flere præfikser og et nr. fx DS 383, DS/EN 5414 osv. Hvis der efter nr. er angivet at A eller Cor, betyder det, enten at det er et tillæg eller et rettelsesblad til hovedstandarden, eller at det er indført i hovedstandarden. DS-betegnelse angives på forsiden. Overensstemmelse med anden publikation: Overensstemmelse kan enten være IDT, EQV, NEQ eller MOD

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DS/EN 61378-2 København DS Projekt: 40517 ICS: 29.180 Deskriptorer: omformertransformere,anvendelse,vikling Første del af denne publikations betegnelse er: DS/EN, hvilket betyder, at det er en europæisk standard, der har status som dansk standard. Denne publikations overensstemmelse er: IDT med: IEC 61378-2:2001 og IDT med: EN 61378-2:2001 på engelsk

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EUROPEAN STANDARD EN 61378-2NORME EUROPÉENNE

EUROPÄISCHE NORM April 2001

CENELECEuropean Committee for Electrotechnical Standardization

Comité Européen de Normalisation ElectrotechniqueEuropäisches Komitee für Elektrotechnische Normung

Central Secretariat: rue de Stassart 35, B - 1050 Brussels

© 2001 CENELEC - All rights of exploitation in any form and by any means reserved worldwide for CENELEC members.

Ref. No. EN 61378-2:2001 E

ICS 29.180

English version

Convertor transformersPart 2: Transformers for HVDC applications

(IEC 61378-2:2001)

Transformateurs de conversionPartie 2: Transformateurs pourapplications CCHT(CEI 61378-2:2001)

StromrichtertransformatorenTeil 2: Transformatoren fürHGÜ-Anwendungen(IEC 61378-2:2001)

This European Standard was approved by CENELEC on 2001-01-01. CENELEC members are bound tocomply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this EuropeanStandard the status of a national standard without any alteration.

Up-to-date lists and bibliographical references concerning such national standards may be obtained onapplication to the Central Secretariat or to any CENELEC member.

This European Standard exists in three official versions (English, French, German). A version in any otherlanguage made by translation under the responsibility of a CENELEC member into its own language andnotified to the Central Secretariat has the same status as the official versions.

CENELEC members are the national electrotechnical committees of Austria, Belgium, Czech Republic,Denmark, Finland, France, Germany, Greece, Iceland, Ireland, Italy, Luxembourg, Netherlands, Norway,Portugal, Spain, Sweden, Switzerland and United Kingdom.

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EN 61378-2:2001 - 2 -

Foreword

The text of document 14/384/FDIS, future edition 1 of IEC 61378-2, prepared by IEC TC 14, Powertransformers, was submitted to the IEC-CENELEC parallel vote and was approved by CENELEC asEN 61378-2 on 2001-01-01.

The following dates were fixed:

� latest date by which the EN has to be implementedat national level by publication of an identicalnational standard or by endorsement (dop) 2001-11-01

� latest date by which the national standards conflictingwith the EN have to be withdrawn (dow) 2004-01-01

Annexes designated "normative" are part of the body of the standard.In this standard, annex ZA is normative.Annex ZA has been added by CENELEC.

__________

Endorsement notice

The text of the International Standard IEC 61378-2:2001 was approved by CENELEC as a EuropeanStandard without any modification.

In the official version, for Bibliography, the following note has to be added for the standard indicated:

IEC 60310 NOTE: Harmonized as EN 60310:1996 (not modified).

__________

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- 3 - EN 61378-2:2001

Annex ZA(normative)

Normative references to international publicationswith their corresponding European publications

This European Standard incorporates by dated or undated reference, provisions from otherpublications. These normative references are cited at the appropriate places in the text and thepublications are listed hereafter. For dated references, subsequent amendments to or revisions of anyof these publications apply to this European Standard only when incorporated in it by amendment orrevision. For undated references the latest edition of the publication referred to applies (includingamendments).

NOTE When an international publication has been modified by common modifications, indicated by (mod), the relevantEN/HD applies.

Publication Year Title EN/HD Year

IEC 60076-1 (mod) 1993 Power transformersPart 1: General

EN 60076-1 1997

IEC 60076-2 (mod) 1993 Part 2: Temperature rise EN 60076-2 1997

IEC 60076-3 2000 Part 3: Insulation levels, dielectric testsand external clearances in air

EN 60076-3 2001

IEC 60076-5 (mod) 1976 Part 5: Ability to withstand short-circuit HD 398.5 S11) 1983

IEC 60076-8 1997 Part 8: Application guide - -

IEC 60076-10 2) Part 10: Determination of sound levels - -

IEC 60137 1995 Insulated bushings for alternatingvoltages above 1 kV

EN 60137 1996

IEC 60146-1-1 1991 Semiconductor convertors - Generalrequirements and line commutatedconvertorsPart 1-1: Specifications of basicrequirements

EN 60146-1-1 1993

IEC 60146-1-2 1991 Semiconductor convertors - Generalrequirements and line commutatedconvertorsPart 1-2: Application guide

- -

IEC 60214 (mod) 1989 On-load tap-changers EN 60214 1997

IEC 60270 2000 High-voltage test techniques - Partialdischarge measurements

EN 60270 2001

IEC 60354 1991 Loading guide for oil-immersed powertransformers

- -

1) HD 398.5 S1 is superseded by EN 60076-5:2000 which is based on IEC 60076-5:2000.

2) To be published.

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EN 61378-2:2001 - 4 -

Publication Year Title EN/HD Year

IEC 60567 1992 Guide for the sampling of gases and of oilfrom oil-filled electrical equipment and forthe analysis of free and dissolved gases

EN 60567 1992

IEC 61378-1 1997 Convertor transformersPart 1: Transformers for industrialapplications

EN 61378-1+ corr. November

19981998

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NORMEINTERNATIONALE

CEIIEC

INTERNATIONALSTANDARD

61378-2Première édition

First edition2001-02

Transformateurs de conversion –

Partie 2:Transformateurs pour applications CCHT

Convertor transformers –

Part 2:Transformers for HVDC applications

Numéro de référenceReference number

CEI/IEC 61378-2:2001

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61378-2 © IEC:2001 – 2 –

CONTENTS Page

FOREWORD .......................................................................................................................... 4

Clause

1 General ............................................................................................................................ 6

1.1 Scope ..................................................................................................................... 6

1.2 Service conditions................................................................................................... 6

2 Normative references ....................................................................................................... 6

3 Definitions........................................................................................................................ 7

4 List of variables................................................................................................................ 8

5 Ratings ............................................................................................................................ 9

5.1 General................................................................................................................... 9

5.2 Rated voltage ......................................................................................................... 9

5.3 Rated current .......................................................................................................... 9

5.4 Rated frequency ..................................................................................................... 9

5.5 Rated power ........................................................................................................... 9

6 Tolerances ....................................................................................................................... 9

6.1 General................................................................................................................... 9

6.2 Short-circuit impedance tolerances ......................................................................... 9

6.3 Guarantees ........................................................................................................... 10

7 Losses ........................................................................................................................... 10

7.1 General................................................................................................................. 10

7.2 No-load loss.......................................................................................................... 10

7.3 Load loss under rated power-frequency conditions................................................ 10

7.4 Load loss under service conditions ....................................................................... 11

7.5 Determination of hot-spot temperature .................................................................. 12

8 Insulation levels ............................................................................................................. 12

8.1 Line windings ........................................................................................................ 12

8.2 Valve windings ...................................................................................................... 12

8.3 Induced voltage level with partial discharge measurements .................................. 13

9 Sound level .................................................................................................................... 13

9.1 General................................................................................................................. 13

9.2 Guaranteed sound-power levels ............................................................................ 13

9.3 Sound-power level at site ...................................................................................... 14

10 Testing........................................................................................................................... 14

10.1 General................................................................................................................. 14

10.2 Tests .................................................................................................................... 14

10.3 Load-loss measurements ...................................................................................... 15

10.4 Factory dielectric tests .......................................................................................... 16

10.5 Temperature-rise test............................................................................................ 19

10.6 Load-current test................................................................................................... 21

10.7 Determination of transformer sound-power level ................................................... 21

11 High-frequency modelling............................................................................................... 21

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61378-2 © IEC:2001 – 3 –

Clause Page

12 Loading of transformer above rating ............................................................................... 21

13 Bushings ........................................................................................................................ 21

13.1 AC bushings ......................................................................................................... 21

13.2 Valve winding bushings......................................................................................... 21

14 Tap-changer .................................................................................................................. 22

14.1 General................................................................................................................. 22

14.2 Current wave shape .............................................................................................. 22

Bibliography ......................................................................................................................... 23

Figure 1 – Profile of short-circuit impedance tolerances for tapping ranges ≤30 %................ 10

Figure 2 – Double reversal test voltage profile ...................................................................... 18

Table 1 – Test conditions for three-winding transformers ...................................................... 20

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61378-2 © IEC:2001 – 4 –

INTERNATIONAL ELECTROTECHNICAL COMMISSION ____________

CONVERTOR TRANSFORMERS –

Part 2: Transformers for HVDC applications

FOREWORD

1) The IEC (International Electrotechnical Commission) is a worldwide organization for standardization comprising all national electrotechnical committees (IEC National Committees). The object of the IEC is to promote international co-operation on all questions concerning standardization in the electrical and electronic fields. To this end and in addition to other activities, the IEC publishes International Standards. Their preparation is entrusted to technical committees; any IEC National Committee interested in the subject dealt with may participate in this preparatory work. International, governmental and non-governmental organizations liaising with the IEC also participate in this preparation. The IEC collaborates closely with the International Organization for Standardization (ISO) in accordance with conditions determined by agreement between the two organizations.

2) The formal decisions or agreements of the IEC on technical matters express, as nearly as possible, an international consensus of opinion on the relevant subjects since each technical committee has representation from all interested National Committees.

3) The documents produced have the form of recommendations for international use and are published in the form of standards, technical specifications, technical reports or guides and they are accepted by the National Committees in that sense.

4) In order to promote international unification, IEC National Committees undertake to apply IEC International Standards transparently to the maximum extent possible in their national and regional standards. Any divergence between the IEC Standard and the corresponding national or regional standard shall be clearly indicated in the latter.

5) The IEC provides no marking procedure to indicate its approval and cannot be rendered responsible for any equipment declared to be in conformity with one of its standards.

6) Attention is drawn to the possibility that some of the elements of this International Standard may be the subject of patent rights. The IEC shall not be held responsible for identifying any or all such patent rights.

International Standard IEC 61378-2 has been prepared by IEC technical committee 14: Power transformers.

The text of this standard is based on the following documents:

FDIS Report on voting

14/384/FDIS 14/386/RVD

Full information on the voting for the approval of this standard can be found in the report on voting indicated in the above table.

This publication has been drafted in accordance with the ISO/IEC Directives, Part 3.

IEC 61378 consists of the following parts, under the general title: Convertor transformers:

– Part 1: Transformers for industrial applications;

– Part 2: Transformers for HVDC applications;

– Part 3: Application guide (under consideration).

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61378-2 © IEC:2001 – 5 –

The committee has decided that the contents of this publication will remain unchanged until 2004. At this date, the publication will be

• reconfirmed;

• withdrawn;

• replaced by a revised edition, or

• amended.

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61378-2 © IEC:2001 – 6 –

CONVERTOR TRANSFORMERS –

Part 2: Transformers for HVDC applications

1 General

1.1 Scope

This part of IEC 61378 applies to oil-immersed three-phase and single-phase convertor transformers for use in HVDC power transmission. It applies to transformers having two, three or multiple windings.

This standard does not apply to

– convertor transformers for industrial applications (see IEC 61378-1);

– convertor transformers for traction applications (see IEC 60310).

1.2 Service conditions

1.2.1 General

Convertor transformers in this standard shall comply with the service conditions stated in IEC 60076-1, except where it is clearly not applicable to convertor transformers or when other requirements are specified herein. It is assumed that the transformer operates in an approximately symmetrical three-phase system, unless otherwise stated.

1.2.2 Temperature

If any part of the transformer (for example, the valve bushings) protrudes into the valve hall, the maximum temperature in the valve hall shall be specified in addition to the normal ambient temperature.

1.2.3 Load current

The currents flowing through the transformers contain harmonics. Residual d.c. currents also flow through the valve windings. The supplier shall be provided with the harmonic content and the magnitude of the residual d.c. currents in the enquiry and have it confirmed during the contract stage.

1.2.4 Direction of power flow

Unless otherwise specified, the transformer shall be designed for both rectifier and inverter operation.

2 Normative references

The following normative documents contain provisions which, through reference in this text, constitute provisions of this part of IEC 61378. For dated references, subsequent amendments to, or revisions of, any of these publications do not apply. However, parties to agreements based on this part of IEC 61378 are encouraged to investigate the possibility of applying the most recent editions of the normative documents indicated below. For undated references, the latest edition of the normative document referred to applies. Members of IEC and ISO maintain registers of currently valid International Standards.

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61378-2 © IEC:2001 – 7 –

IEC 60076-1:1993, Power transformers – Part 1: General

IEC 60076-2:1993, Power transformers – Part 2: Temperature rise

IEC 60076-3:2000, Power transformers – Part 3: Insulation levels, dielectric tests and external clearances in air

IEC 60076-5:1976, Power transformers – Part 5: Ability to withstand short-circuit

IEC 60076-8:1997, Power transformers – Part 8: Application guide

IEC 60076-10:—, Power transformers and reactors – Part 10: Determination of sound levels 1)

IEC 60137:1995, Insulated bushings for alternating voltages above 1 000 V

IEC 60146-1-1:1991, Semiconductor convertors – General requirements and line commutated converters – Part 1-1: Specifications of basic requirements

IEC/TR 60146-1-2:1991, Semiconductor convertors – General requirements and line commutated convertors – Part 1-2: Application guide

IEC 60214:1989, On-load tap-changers

IEC 60270:, Partial discharge measurements 1)

IEC 60354:1991, Loading guide for oil-immersed power transformers

IEC 60567:1992, Guide for the sampling of gases and of oil from oil-filled electrical equipment and for the analysis of free and dissolved gases

IEC 61378-1:1997, Convertor transformers – Part 1: Transformers for industrial application

3 Definitions

For the purpose of this part of IEC 61378, the definitions of IEC 60050 (IEV) apply. Additional definitions of more specific transformer and convertor terms are given in IEC 60076-1 and IEC 60146-1-1, respectively. Where some of these terms are at variance with earlier definitions of the same terms, found in the IEV, the terms specified in IEC 60076-1 and IEC 60146-1-1 will take precedence.

___________ 1) To be published.

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