BS EN 60076-3-2001 电力变压器.绝缘水平和介质性能试验以及空气中的外部间隙.pdf

BRITISH STANDARD Power transformers Part 3: Insulation levels, dielectric tests and external clearances in air The European Standard EN 60076-3:2001 has the status of a British Standard ICs 29.180 BS EN 600 76-3:200 1 _ I I NO COPYING WITHOUT BSI PERMISSION EXCEPT AS PERMITTED BY COPYRIGHT LAW Copyright European Committee for Electrotechnical Standardization Provided by IHS under license with CENELEC Not for ResaleNo reproduction or networking permitted without license from IHS -,- BS EN 60076-3:2001 Amd. No. This British Standard, having been prepared under the direction of the Electrotechnical Sector Committee, was published under the authority of the Standards Committee and comes into effect on 15 July 2001 Date Comments National foreword This British Standard is the official English language version of EN 60076- 3:2001. It was derived by CENELEC from IEC 60076-3:2000. It supersedes BS l7l:Part 3:1987 which is withdrawn. The CENELEC common modifications have been implemented at the appropriate places in the text and are indicated by a sideline in the margin. The UK participation in its preparation was entrusted to Technical Committee U14, Power transformers, which has the responsibility to: - - aid enquirers to understand the text; present to the responsible internationallEuropean committee any enquiries on the interpretation, or proposals for change, and keep the UK interests informed; monitor related international and European developments and promulgate them in the UK. - A list of organizations represented on this committee can be obtained on request to its secretary. From 1 January 1997, all IEC publications have the number 60000 added to the old number. For instance, IEC 27-1 has been renumbered as IEC 60027-1. For a period of time during the change over from one numbering system to the other, publications may contain identifiers from both systems. Cross-references The British Standards which implement these international or European publications may be found in the BSI Standards Catalogue under the section entitled “International Standards Correspondence Index”, or by using the “Find” facility of the BSI Standards Electronic Catalogue. A British Standard does not purport to include all the necessary provisions of a contract. Users of British Standards are responsible for their correct application. Compliance with a British Standard does not of itself confer immunity from legal obligations. Summary of pages This document comprises a front cover, an inside front cover, the EN title page, pages 2 to 55 and a back cover. The BSI copyright date displayed in this document indicates when the document was last issued. Amendments issued since publication O BSI 07-2001 ISBN O 580 37762 8 Copyright European Committee for Electrotechnical Standardization Provided by IHS under license with CENELEC Not for ResaleNo reproduction or networking permitted without license from IHS -,- EUROPEAN STANDARD EN 60076-3 NORME EUROPENNE EUROPISCHE NORM May 2001 ICs 29.180 Supersedes HD 398.3 S1:1986 + A1:1995 English version Power transformers Part 3: Insulation levels, dielectric tests and external clearances in air (IEC 60076-3:2000 + corrigendum 2000) Transformateurs de puissance Leistungstransformatoren Partie 3: Niveaux disolement, essais dilectriques et distances disolement dans lair (CE1 60076-3:2000 + corrigendum 2000) Teil 3: Isolationspegel, Spannungs- Prfungen und uere Abstnde in Luft (IEC 60076-3:2000 + corrigendum 2000) This European Standard was approved by CENELEC on 2001-01-01. CENELEC members are bound to comply with the CENICENELEC Internal Regulations which stipulate the conditions for giving this European Standard the status of a national standard without any alteration. Up-to-date lists and bibliographical references concerning such national standards may be obtained on application to the Central Secretariat or to any CENELEC member. This European Standard exists in three official versions (English, French, German). A version in any other language made by translation under the responsibility of a CENELEC member into its own language and notified 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. CENELEC European Committee for Electrotechnical Standardization Comit Europen de Normalisation Electrotechnique Europisches Komitee fr Elektrotechnische Normung Central Secretariat: rue de Stassart 35, B - 1050 Brussels 0 2001 CENELEC - All rights of exploitation in any form and by any means reserved worldwide for CENELEC members. Ref. No. EN 60076-3:2001 E Copyright European Committee for Electrotechnical Standardization Provided by IHS under license with CENELEC Not for ResaleNo reproduction or networking permitted without license from IHS -,- Page 2 EN 60076-3:2001 Foreword The text of document 14/347/FDIS, future edition 2 of IEC 60076-3, prepared by IEC TC 14, Power transformers, was submitted to the IEC-CENELEC parallel vote and was approved by CENELEC as EN 60076-3 on 2001-01-01. This European Standard supersedes HD 398.3 S1:1986 + A1:1995. The following dates were fixed: - latest date by which the EN has to be implemented at national level by publication of an identical national standard or by endorsement - latest date by which the national standards conflicting with the EN have to be withdrawn (dop) 2001-10-01 (dow) 2004-01-01 Annexes designated normative are part of the body of the standard. Annexes designated informative are given for information only. In this standard, annexes D, ZA and ZB are normative and annexes A, B and C are informative. Annexes ZA and ZB have been added by CENELEC. Endorsement notice The text of the International Standard IEC 60076-3:ZOOO + corrigendum December 2000 was approved by CENELEC as a European Standard with the following editorial modification. In subclause 12.3, delete note 3. Copyright European Committee for Electrotechnical Standardization Provided by IHS under license with CENELEC Not for ResaleNo reproduction or networking permitted without license from IHS -,- w w w . b z f x w . c o m Page 3 EN 60076-3:2001 CONTENTS Page INTRODUCTION . 5 Clause 8 9 Scope . 6 Normative references . 6 Definitions . 7 General . 7 Highest voltage for equipment and insulation level . 8 Rules for some particular transformers . 1 0 Insulation requirements and dielectric tests . Basic rules . 11 7.1 General . 11 7.2 Insulation requirements . 12 7.4 Insulation requirements and tests for the neutral terminal of a winding . 16 Tests on a transformer having a tapped winding . 17 7.3 Dielectric tests . 14 Repeated dielectric tests . 18 1 O 1 1 12 Induced AC voltage tests (ACSD. ACLD) . 19 12.2 Short-duration induced AC withstand voltage test (ACSD) for transformers with uniformly insulated high-voltage windings . 19 12.3 Short-duration AC withstand voltage test (ACSD) for transformers with 12.4 Long-duration induced AC voltage test (ACLD) with non-uniformly and/or uniformly insulated high-voltage windings. according to table 1 . 24 13 Lightning impulse (LI) test . 27 13.1 General . 27 13.2 Test sequence . 28 13.3 Test connections . 28 13.4 Records of test . 30 13.5 Test criteria . 30 14 Test with lightning impulse chopped on the tail (LIC) . 30 14.1 General . 30 14.2 Chopping gap and characteristics of the chopping . 31 14.3 Test sequence and test criteria . 31 Insulation of auxiliary wiring . 18 Separate source AC withstand voltage test . 18 12.1 General . 19 non-uniformly insulated high-voltage windings . 22 0 BSI 07-2001 Copyright European Committee for Electrotechnical Standardization Provided by IHS under license with CENELEC Not for ResaleNo reproduction or networking permitted without license from IHS -,- w w w . b z f x w . c o m Page 4 EN 60076-3:2001 Clause Page 15 Switching impulse test (SI) . 31 15.1 General . 31 15.2 Test sequence and records . 32 15.3 Test connections . 32 15.4 Test criteria . 33 16 External clearances in air . 33 16.1 General . 33 16.2 Bushing clearance requirements as determined by transformer insulation withstand voltages . 34 Annex A (Informative) Application guide for partial discharge measurements during induced a.c. withstand voltage test on transformers according to 12.2, 12.3 and 12.4 . 42 Annex B (informative) Overvoltage transferred from the high-voltage winding to Annex C (informative) Information on transformer insulation and dielectric tests to be supplied with an enquiry and with an order . 51 Annex D (normative) ACSD . 52 a low-voltage winding . 49 Annex ZA (normative) Normative references to international publications with their corresponding European publications . 54 Annex ZB (normative) Special national conditions . 55 O BSI 07-2001 Copyright European Committee for Electrotechnical Standardization Provided by IHS under license with CENELEC Not for ResaleNo reproduction or networking permitted without license from IHS -,- w w w . b z f x w . c o m Page 5 EN 60076-32001 INTRODUCTION This part of IEC 60076 specifies the insulation requirements and the corresponding insulation tests with reference to specific windings and their terminals. It also recommends clearances in air between live parts of bushings on oil-immersed power transformers and to objects at earth potential (clause 16). Guidance can be obtained from IEC 60071. The insulation levels and dielectric tests which are specified in clauses 4, 5, 6 and 7 in this standard apply to the internal insulation only. Whilst it is reasonable that the rated withstand voltage values which are specified for the internal insulation of the transformer should also be taken as a reference for its external insulation, this may not be true in all cases. A failure of the non-self-restoring internal insulation is catastrophic and normally leads to the transformer being out of service for a long period, while an external flashover may involve only a short interruption of service without causing lasting damage. Therefore, it may be that, for increased safety, higher test voltages are specified by the purchaser for the internal insulation of the transformer than for the external insulation of other components in the system. When such a distinction is made, the external clearances must be adjusted to fully cover the internal insulation test requirements. O BSI 07-2001 Copyright European Committee for Electrotechnical Standardization Provided by IHS under license with CENELEC Not for ResaleNo reproduction or networking permitted without license from IHS -,- w w w . b z f x w . c o m Page 6 EN 60076-3:2001 POWER TRANSFORMERS - Part 3: Insulation levels, dielectric tests and external clearances in air