IEC_TR_62981-2017.pdf

IEC TR 62981 Edit ion 1.0 2017-05 TECHNICA L REPOR T Studies and comparisons of magnetic measurements on grain-oriented electrical steelsheet determined by the single sheet test method and Epstein test method IEC TR 62981:2017-05(en)colourinside THIS PUBLICA TION IS COPYRIGHT PROTECTED Copyright 2017 IEC,Geneva,Switzerland All rights reserved.Unless otherwise specified,no par t of this publication may be reproduced or utilized in any for m or by any means,electronic or mechanical,including photocopying and microfilm,without per mission in writing fr om 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 r ights to this publication,please contact the address below or your local IEC member National Committee for further infor mation.IEC Centr al 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 t he IEC The International Electr otechnical Commission(IEC)is the leading global organization that prepar es and publishes Inter national Standards for all electr ical,electronic and related technologies.A bout IEC publications The technical content of IEC publications is kept under constant review by the IEC.Please make sur e that you have the latest edition,a cor rigenda or an amendment might have been published.IEC Cat alogue-webstore.iec.ch/cat alogue The stand-alone application for consulting the entire bibliographical information on IEC International Standards,Technical Specifications,Technical R eports and other documents.A v ailable for PC,Mac OS,A ndroid Tablets and iPad.IEC publications search-w w w.iec.ch/searchpub The adv anced search enables to find IEC publications by a variety of criteria(reference number,text,technical committee,).It also gives information on projec ts,replaced and withdrawn publications.IEC Just Published-webstore.iec.ch/justpublished Stay up to date on all new IEC publications.Just Published details all new publications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.A v ailable online and also once a month by email.Elect ropedia-w w w.elect ropedia.org The worlds leading online dic tionary of elec tronic and electrical terms containing 20 000 terms and definitions in English and French,with equiv alent terms in 16 additional languages.A lso known as the International Electrotechnical Vocabulary (IEV)online.IEC Glossar y-st d.iec.ch/glossary 65 000 elec trotechnical terminology entries in English and French extracted from the Terms and Definitions clause of IEC publications issued since 2002.Some entries hav e been collected from earlier publications of IEC TC 37,77,86 and CISPR.IEC Customer Service Cent re-webstore.iec.ch/csc If y ou wish to giv e us y our feedback on this publication or need further assistance,please contact the Customer Serv ice Centre:csciec.ch.IEC TR 62981 Edit ion 1.0 2017-05 TECHNICA L R EPOR T Studies and comparisons of magnetic measurements on grain-oriented electrical steelsheet determined by the single sheet test method and Epstein test method INTERNATIONAL ELECTROTECHNICAL COMMISSION ICS 29.030 ISBN 978-2-8322-4332-9 R egist er ed tr ademar k of t he Int er national Electr ot echnical Commission W arning!Make sure that y ou obtained this publication from an authorized distributor.colourinside 2 IEC TR 62981:2017 IEC 2017 CONTENTS FOREWORD.4 1 Scope.6 2 Normative references.6 3 Terms and definitions.6 4 Background.7 4.1 Historical background and former concepts of the SST-Epstein relationship.7 4.2 Establishing reference values for grain-oriented electrical steels determined by independent SSTs A new approach to the purpose.8 5 Preliminary comparisons and experiments.9 5.1 General.9 5.2 Comparison of the relative difference PSE=(PSST Peps)/PEps measured by steel manufacturers on their own products using own set-ups.10 5.3 Preliminary comparisons and experiments made by four Chinese laboratories using six SSTs with stacked yokes.11 5.4 Necessity of comparing independent SST results.13 6 International comparison of SST measurements on grain-oriented electrical steel and accompanying Epstein measurements.15 6.1 General conditions,samples,participants.15 6.2 Circulation of the samples and measurement procedure.16 6.3 Results and analysis of the measured quantities.17 6.4 Conclusions of the international comparison.30 7 Summary and conclusions.31 Bibliography.32 Figure 1 Epstein frame and single sheet tester,schematic view,windings partly omitted.7 Figure 2 Relative difference PSE=100(PSST PEP)/PEP versus peak magnetic polarization J measured by six contributors on samples of their own products.10 Figure 3 Contact pattern for the measurement of lamination resistance in the air gap of SST yokes.11 Figure 4 Ratio of the power loss PSST to that of the SST with the best yokes,PSSTopt,versus lamination conductivity factor CY of the yokes.12 Figure 5 Ratio of the power loss at 100 Hz to that at 40 Hz,P100/P40,at 1,7