1、Power transformers Part 3:Insulation levels,dielectric tests andexternal clearances in airReference numberIEC 60076-3:2000(E)INTERNATIONALSTANDARDIEC60076-3Second edition2000-03This English-language version is derived from the originalbilingual publication by leaving out all French-languagepages.Mis
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8、:Email:custserviec.ch Tel:+41 22 919 02 11 Fax:+41 22 919 03 00 Power transformers Part 3:Insulation levels,dielectric tests andexternal clearances in airFor price,see current catalogue IEC 2000 Copyright-all rights reservedNo part of this publication may be reproduced or utilized in any form or by
9、any means,electronic or mechanical,including photocopying and microfilm,without permission in writing from the publisher.International Electrotechnical Commission,3,rue de Varemb,PO Box 131,CH-1211 Geneva 20,SwitzerlandTelephone:+41 22 919 02 11 Telefax:+41 22 919 03 00 E-mail:inmailiec.ch Web:www.i
10、ec.chINTERNATIONALSTANDARDIEC60076-3Second edition2000-03XACommission Electrotechnique InternationaleInternational Electrotechnical Commission PRICE CODE60076-3 IEC:2000 3 CONTENTSPageFOREWORD.7INTRODUCTION.11Clause1Scope.132Normative references.133Definitions.154General.155Highest voltage for equip
11、ment and insulation level.176Rules for some particular transformers.217Insulation requirements and dielectric tests Basic rules.237.1General.237.2Insulation requirements.257.3Dielectric tests.297.4Insulation requirements and tests for the neutral terminal of a winding.338Tests on a transformer havin
12、g a tapped winding.359Repeated dielectric tests.3710Insulation of auxiliary wiring.3711Separate source AC withstand voltage test.3712Induced AC voltage tests(ACSD,ACLD).3912.1General.3912.2Short-duration induced AC withstand voltage test(ACSD)for transformerswith uniformly insulated high-voltage win
13、dings.3912.3Short-duration AC withstand voltage test(ACSD)for transformers withnon-uniformly insulated high-voltage windings.4512.4Long-duration induced AC voltage test(ACLD)with non-uniformly and/oruniformly insulated high-voltage windings,according to table 1.4913Lightning impulse(LI)test.5513.1Ge
14、neral.5513.2Test sequence.5713.3Test connections.5713.4Records of test.6113.5Test criteria.6114Test with lightning impulse chopped on the tail(LIC).6114.1General.6114.2Chopping gap and characteristics of the chopping.6314.3Test sequence and test criteria.6360076-3 IEC:2000 5 ClausePage15Switching im
15、pulse test(SI).6315.1General.6315.2Test sequence and records.6515.3Test connections.6515.4Test criteria.6716External clearances in air.6716.1General.6716.2Bushing clearance requirements as determined by transformer insulationwithstand voltages.69Annex A(Informative)Application guide for partial disc
16、harge measurements duringinduced a.c.withstand voltage test on transformers according to 12.2,12.3 and 12.4.85Annex B(informative)Overvoltage transferred from the high-voltage winding toa low-voltage winding.99Annex C(informative)Information on transformer insulation and dielectric teststo be supplied with an enquiry and with an order.103Annex D(normative)ACSD.10560076-3 IEC:2000 7 INTERNATIONAL ELECTROTECHNICAL COMMISSION_POWER TRANSFORMERS Part 3:Insulation levels,dielectric tests andexternal
