1、 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 20
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11、in-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
12、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 g
13、rain-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 Preli
14、minary 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 condi
15、tions,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 vi
16、ew,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
