IEC_TR_61869-100-2017.pdf

IEC TR 61869-100 Edition 1.0 2017-01 TECHNICAL REPORT Instrument transformers Part 100:Guidance for application of current transformers in power system protection IEC TR 61869-100:2017-01(en)colourinsideCopyright International Electrotechnical Commission Provided by IHS under license with IECLicensee=Hong Kong Polytechnic University/9976803100,User=yin,sanNot for Resale,01/25/2017 06:54:05 MSTNo reproduction or networking permitted without license from IHS-,-,-THIS PUBLICATION IS COPYRIGHT PROTECTED Copyright 2017 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.IEC Catalogue-webstore.iec.ch/catalogue The stand-alone application for consulting the entire bibliographical information on IEC International Standards,Technical Specifications,Technical Reports and other documents.Available for PC,Mac OS,Android Tablets and iPad.IEC publications search-www.iec.ch/searchpub The advanced search enables 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by a variety of criteria(reference number,text,technical committee,).It also gives information on projects,replaced and withdrawn publications.IEC Just Published-webstore.iec.ch/justpublished Stay up to date on all new IEC publications.Just Published details all new publications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 online and also once a month by email.Electropedia-www.electropedia.org The worlds leading online dictionary of electronic and electrical terms containing 20 000 terms and definitions in English and French,with equivalent terms in 16 additional languages.Also known as the International Electrotechnical Vocabulary(IEV)online.IEC Glossary-std.iec.ch/glossary 65 000 electrotechnical terminology entries in English and French extracted from the Terms and Definitions clause of IEC publications issued since 2002.Some entries have been collected from earlier publications of IEC TC 37,77,86 and CISPR.IEC 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.Copyright International Electrotechnical Commission Provided by IHS under license with IECLicensee=Hong Kong Polytechnic University/9976803100,User=yin,sanNot for Resale,01/25/2017 06:54:05 MSTNo reproduction or networking permitted without license from IHS-,-,-IEC TR 61869-100 Edition 1.0 2017-01 TECHNICAL REPORT Instrument transformers Part 100:Guidance for application of current transformers in power system protection INTERNATIONAL ELECTROTECHNICAL COMMISSION ICS 17.220.20 ISBN 978-2-8322-3808-0 Registered trademark of the International Electrotechnical Commission Warning!Make sure that you obtained this publication from an authorized distributor.colourinsideCopyright International Electrotechnical Commission Provided by IHS under license with IECLicensee=Hong Kong Polytechnic University/9976803100,User=yin,sanNot for Resale,01/25/2017 06:54:05 MSTNo reproduction or networking permitted without license from IHS-,-,-2 IEC TR 61869-100:2017 IEC 2017 CONTENTS FOREWORD.7 INTRODUCTION.9 1 Scope.10 2 Normative references.10 3 Terms and definitions and abbreviations.10 3.1 Terms and definitions.10 3.2 Index of abbreviations.12 4 Responsibilities in the current transformer design process.14 4.1 History.14 4.2 Subdivision of the current transformer design process.14 5 Basic theoretical equations for transient designing.15 5.1 Electrical circuit.15 5.1.1 General.15 5.1.2 Current transformer.18 5.2 Transient behaviour.20 5.2.1 General.20 5.2.2 Fault inception angle.22 5.2.3 Differential equation.23 6 Duty cycles.25 6.1 Duty cycle C O.25 6.1.1 General.25 6.1.2 Fault inception angle.27 6.1.3 Transient factor Ktf and transient dimensioning factor Ktd.28 6.1.4 Reduction of asymmetry by definition of the minimum current inception angle.50 6.2 Duty cycle C O C O.53 6.2.1 General.53 6.2.2 Case A:No saturation occurs until t.54 6.2.3 Case B:Saturation occurs between tal and t.56 6.3 Summary.58 7 Determination of the tr