IEC_TR_62271-306-2012.pdf

IEC/TR 62271-306 Edition 1.0 2012-12 TECHNICAL REPORT High-voltage switchgear and controlgear Part 306:Guide to IEC 62271-100,IEC 62271-1 and other IEC standards related to alternating current circuit-breakers IEC/TR 62271-306:2012(E)colourinside THIS PUBLICATION IS COPYRIGHT PROTECTED Copyright 2012 IEC,Geneva,Switzerland All rights reserved.Unless otherwise specified,no part of this publication may be reproduced or utilized in any form or by any means,electronic or mechanical,including photocopying and microfilm,without permission in writing from either IEC or IECs member National Committee in the country of the requester.If you have any questions about IEC copyright or have an enquiry about obtaining additional rights to this publication,please contact the address below or your local IEC member National Committee for further information.IEC Central Office Tel.:+41 22 919 02 11 3,rue de Varemb Fax:+41 22 919 03 00 CH-1211 Geneva 20 infoiec.ch Switzerland www.iec.ch About the IEC The International Electrotechnical Commission(IEC)is the leading global organization that prepares and publishes International Standards for all electrical,electronic and related technologies.About IEC publications The technical content of IEC publications is kept under constant review by the IEC.Please make sure that you have the latest edition,a corrigenda or an amendment might have been published.Useful links:IEC publications search-www.iec.ch/searchpub The advanced search enables you to find IEC publications by a variety of criteria(reference number,text,technical committee,).It also gives information on projects,replaced and withdrawn publications.IEC Just Published-webstore.iec.ch/justpublished Stay up to date on all new IEC publications.Just Published details all new publications released.Available on-line and also once a month by email.Electropedia-www.electropedia.org The worlds leading online dictionary of electronic and electrical terms containing more than 30 000 terms and definitions in English and French,with equivalent terms in additional languages.Also known as the International Electrotechnical Vocabulary(IEV)on-line.Customer Service Centre-webstore.iec.ch/csc If you wish to give us your feedback on this publication or need further assistance,please contact the Customer Service Centre:csciec.ch.IEC/TR 62271-306 Edition 1.0 2012-12 TECHNICAL REPORT High-voltage switchgear and controlgear Part 306:Guide to IEC 62271-100,IEC 62271-1 and other IEC standards related to alternating current circuit-breakers INTERNATIONAL ELECTROTECHNICAL COMMISSION XM ICS 29.130.10 PRICE CODE ISBN 978-2-83220-558-7 Registered trademark of the International Electrotechnical Commission Warning!Make sure that you obtained this publication from an authorized distributor.colourinside 2 TR 62271-306 IEC:2012(E)CONTENTS FOREWORD.15 1 General.17 Scope.17 1.1 Normative references.17 1.22 Evolution of IEC standards for high-voltage circuit-breaker.18 3 Classification of circuit-breakers.22 General.22 3.1 Electrical endurance class E1 and E2.22 3.2 Capacitive current switching class C1 and C2.23 3.3 Mechanical endurance class M1 and M2.23 3.4 Class S1 and S2.24 3.5 General.24 3.5.1 Cable system.24 3.5.2 Line system.24 3.5.3 Conclusion.24 3.64 Insulation levels and dielectric tests.25 General.25 4.1 Longitudinal voltage stresses.28 4.2 High-voltage tests.28 4.3 Impulse voltage withstand test procedures.29 4.4 General.29 4.4.1 Application to high-voltage switching devices.29 4.4.2 Additional criteria to pass the tests.30 4.4.3 Review and perspective.30 4.4.4 Theory.33 4.4.5 Summary of 15/2 and 3/9 test methods.36 4.4.6 Routine tests.37 4.4.7 Correction factors.37 4.5 Altitude correction factor.37 4.5.1 Humidity correction factor.40 4.5.2 Background information about insulation levels and tests.41 4.6 Specification.41 4.6.1 Testing.43 4.6.2 Combined voltage tests of longitudinal insulation.43 4.6.3 Lightning impulse withstand considerations of vacuum interrupters.44 4.7 General.44 4.7.1 Conditioning during vacuum interrupter manufacturing.44 4.7.2 De-conditioning in service.45 4.7.3 Re-conditioning in service.45 4.7.4 Performing lightning impulse withstand voltage tests.45 4.7.55 Rated normal current and temperature rise.45 General.45 5.1 Load current carrying requirements.45 5.2 Rated normal current.45 5.2.1 Load current carrying capability under various conditions of ambient 5.2.2temperature and load.46 TR 62271-306 IEC:2012(E)3 Temperature rise testing.49 5.3 Influence of power frequency on temperature rise and temperature 5.3.1rise tests.49 Test procedure.49 5.3.2 Temperature rise test on vacuum circuit-breakers.51 5.3.3 Resistance measurement.52 5.3.4 Additional information.52 5.4 Table with ratios Ia/Ir.52 5.4.1 Derivation of temperature rise equations.52 5.4.26 Transient recovery voltage.53 Harmonization of IEC and IEEE transient recovery voltages.53 6.1 General.53 6.1.1 A summary of the TRV changes.54 6.1.2 Revision of TRVs for rated voltages