AS 2326.11991IEC 214: 1989

Australian Standard

On-load tap-changers

Part 1: Requirements

[IEC title: On-load tap-changers]

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This Australian Standard was prepared by Committee EL/8Power Transformers. Itwas approved on behalf of the Council of Standards Australia on 23 April 1991 andpublished on 10 June 1991.

The following interests are represented on Committee EL/8:Australian Electrical and Electronic Manufacturers AssociationConfederation of Australian IndustryElectrical testing laboratoriesElectricity Supply Association of AustraliaElectricity Supply Engineers Association of New South WalesInstitute of Technology, S.A.Institution of Engineers, AustraliaRailways of Australia Committee

Review of Australian Standards. To keep abreast of progress in industry, Australian Standards are subjectto periodic review and are kept up to date by the issue of amendments or new editions as necessary. It isimportant therefore that Standards users ensure that they are in possession of the latest edition, and anyamendments thereto.Full details of all Australian Standards and related publications will be found in the Standards AustraliaCatalogue of Publications; this information is supplemented each month by the magazine The AustralianStandard, which subscribing members receive, and which gives details of new publications, new edit ionsand amendments, and of withdrawn Standards.Suggestions for improvements to Australian Standards, addressed to the head off ice of Standards Australia,are welcomed. Noti fication of any inaccuracy or ambiguity found in an Australian Standard should be madewithout delay in order that the matter may be investigated and appropriate action taken.

This Standard was issued in draft form for comment as DR 90128.

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AS 2326.11991

Australian Standard

On-load tap-changersPart 1: Requirements

First published as AS C3781967.Revised and redesignated AS 2326.11980.Second edition 1991.

PUBLISHED BY STANDARDS AUSTRALIA(STANDARDS ASSOCIATION OF AUSTRALIA)1 THE CRESCENT, HOMEBUSH, NSW 2140

ISBN 0 7262 6922 0

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2PREFACEThis Standard was prepared by the Standards Austral ia Committee on Power Transformers tosupersede AS 2326.11980. It is identical with and has been reproduced from IEC 214:1989,On-loadtap-changers.Variations to the IEC publicationrequired to suit Austral ianrequirementsare indicated by marginal bars and detailed in Australian Appendix AA.This Standard is the first part of a two-part Standard, viz.AS 2326 On-load tap-changers

Part 1: RequirementsPart 2: Application guide.

Under arrangements made between Standards Australia and the international Standardsbodies, ISO and IEC, as well as certain other Standards organizations,users of this Austral ianStandard are advised of the following:(a) Copyright is vested in Standards Australia.(b) The number of this Standard is not reproduced on each page; its identity is shown only on

the cover and title pages.(c) There may be occasional dual language sections, but English is always one of the

languages reproduced.(d) Where any cross-references to page numbers appear within the text, these relate to page

numbering in the International Standard and are to be disregarded.Statements expressed in mandatory terms in notes to clauses, tables, and figures are deemedto be requirements of this Standard.For the purposes of this Austral ian, Standard, the IEC text should be modified as follows:(i) Clauses In accordance with Austral ian Appendix AA.(ii) Decimal marker Substitute a full point for a comma as a decimal marker.(iii) References Replace references to International Standards by references to Austral ian

Standards as fol lows:Reference to International Standard Australian StandardIEC AS60 High-voltage test techniques 1931

1931.1High voltage testing techniquesPart 1: General definitions, testrequirements, test procedures andmeasuring devices

7676-176-3

Power transformersPart 1: GeneralPart 3: Insulation levels and dielectrictests

23742374.12374.3

Power transformersPart 1: General requirementsPart 3: Insulation levels anddielectric tests

137 Bushings for alternating voltages above1000 V

1265 Bushings for alternating voltagesabove 1000 V

144 Degrees of protection of enclosures forlow-voltage switchgear and controlgear

270 Partial discharge measurements 1018 Partial discharge measurements296 Specification for unused mineral

insulating oils for transformers andswitchgear

1767 Insulating oil for transformers andswitchgear

354 Loading guide for oil-immersedtransformers

1078 Guide to loading of oil-immersedtransformers

542 Application guide for on-load tap-changers

23262326.2

On-load tap-changersPart 2: Application guide

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3CONTENTSPage

SECTION ONE - GENERAL1. Scope . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 42. Service conditions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 43. Information required with enquires and orders . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5

SECTION TWO - DEFINITIONS4. Definitions relating to on-load tap-changers

(excluding motor-drive mechanisms) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 55. Definitions relating to motor-drive mechanisms . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9

SECTION THREE - REQUIREMENTS FOR ON-LOADTAP-CHANGERS

6. Rating . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 117. Design and construction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 128. Type tests . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 139. Routine tests . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2510. Nameplate . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26

SECTION FOUR - REQUIREMENTS FOR MOTOR-DRIVEMECHANISMS FOR ON-LOAD TAP-CHANGERS

11. Design and construction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2612. Type tests . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2813. Routine tests . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2914. Nameplate . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30APPENDIX A - Supplementary information on switching duty

relating to tap-changers with resistortransition only . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31

APPENDIX B - Method of determining the equivalent temperatureof the transition resistor using power pulsecurrents . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35

APPENDIX C - Simulated circuits for service duty and breakingcapacity tests . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 36

AUSTRALIAN APPENDIX AA - Variations from IEC 214 required forAustralian conditions . . . . . . . . . . . . . . . . . . . . . . . . . . 39

Copyright STANDARDS AUSTRALIAUsers of Standards are reminded that copyright subsists in all Standards Australia publications and software. Except where theCopyright Act allows and except where provided for below no publications or software produced by Standards Australia may bereproduced, stored in a retrieval system in any form or transmitted by any means without prior permission in wri ting fromStandards Australia. Permission may be conditional on an appropriate royalty payment. Requests for permission and information oncommercial software royalties should be directed to the head off ice of Standards Australia.

Standards Australia wil l permit up to 10 percent of the technical content pages of a Standard to be copied for useexclusively in-house by purchasers of the Standard without payment of a royalty or advice to Standards Australia.Standards Australia wil l also permit the inclusion of its copyright material in computer software programs for no royaltypayment provided such programs are used exclusively in-house by the creators of the programs.

Care should be taken to ensure that material used is from the current edition of the Standard and that it is updated whenever theStandard is amended or revised. The number and date of the Standard should therefore be clearly identif ied.The use of material in print form or in computer software programs to be used commercially, with or without payment, or incommercial contracts is subject to the payment of a royalty. This policy may be varied by Standards Australia at any time.

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AUSTRALIAN STANDARD 4

STANDARDS AUSTRALIA

Australian StandardOn-load tap-changers

Part 1: Requirements

SECTION ONE - GENERAL

1. Scope

This standard applies to on-load tap-changers* for power transformers and theirmotor-drive mechanisms. It relates mainly to tap-changers immersed in transformer oilaccording to IEC Publication 296, but may also be used for gas-insulated tap-changersin so far as conditions are applicable.

Note.- For the purpose of this standard, a synthetic insulating liquid is regarded as an oil . A syntheticinsulating liquid can be used for a tap-changer only if it is compatible with the tap-changerdesign.

Tap-changers for transformers for railway rolling stock are excluded from thisstandard.

In selecting a tap-changer for a particular application, reference should be madeto IEC Publication 542.

2. Service conditions

a) Temperature of tap-changer environmentUnless more onerous conditions are specified by the purchaser, tap-changers are

regarded as suitable for operation over the ranges of temperature given in Table 1.

Table 1 Temperature of tap-changer environment

Tap-changerenvironment

Temperature

Minimum Maximum

AirOil

- 25 C- 25 C

40 C100 C

* See Note to Sub-clause 4.1.

COPYRIGHT

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AS 2326.11991 ON-LOAD TAP-CHANGERS - REQUIREMENTSPREFACECONTENTSSECTION ONE - GENERAL1. Scope2. Service conditions3. Information required with enquiries and orders

SECTION TWO - DEFINITIONS4. Definitions relating to on-load tap-changers (excluding motor-drive mechanisms)5. Definitions relating to motor-drive mechanisms

SECTION THREE - REQUIREMENTS FOR ON-LOAD TAP-CHANGERS6. Rating7 Design and construction8. Type tests9. Routine tests10. Nameplate

SECTION FOUR - REQUIREMENTS FOR MOTOR-DRIVE MECHANISMS FOR ON-LOAD TAP-CHANGERS11. Design and construction12. Type tests13. Routine tests14. Nameplate

APPENDIX A - SUPPLEMENTARY INFORMATION ON SWITCHING DUTY RELATING TO TAP-CHANGERS WITH RESISTOR TRANSITION ONLYA1. Additional definitionsA2. Duty on main and transi tion contacts

APPENDIX B - METHOD OF DETERMINING THE EQUIVALENT TEMPERATURE OF THE TRANSITION RESISTOR USING POWER PULSE CURRENTSAPPENDIX C - SIMULATED CIRCUITS FOR SERVICE DUTY AND BREAKING CAPACITY TESTSAUSTRALIAN APPENDIX AA - VARIATIONS FROM IEC 214 REQUIRED FOR AUSTRALIAN CONDITIONS

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