IEC TR 62981-2017 Studies and comparisons of magnetic measurements on grain-oriented electrical steelsheet determined by the single sheet test method and Epstei.pdf

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1、 IEC TR 62981 Edition 1.0 2017-05 TECHNICAL REPORT 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) colour inside THIS PUBLICATION IS COPYRIGHT PROTECTED Copyright 2017

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10、6 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. IEC TR 62981 Edition 1.0 2017-05 TECHNICAL REPORT Studies and comparisons of magnetic measurement

11、s 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 Registered trademark of the International Electrotechnical Commission Warning! Make sure that you obtained this pub

12、lication from an authorized distributor. colour inside 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 fo

13、r 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 P SE= (P SST P eps )/P Epsmeasured by steel manufacturers on their own products using own set-ups

14、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 G

15、eneral 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 s

16、heet tester, schematic view, windings partly omitted . 7 Figure 2 Relative difference P SE= 100 (P SST P EP ) / P EPversus 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

17、gap of SST yokes 11 Figure 4 Ratio of the power loss P SSTto that of the SST with the best yokes, P SSTopt , versus lamination conductivity factor C Yof the yokes 12 Figure 5 Ratio of the power loss at 100 Hz to that at 40 Hz, P 100 /P 40 , at 1,7 T, versus lamination conductivity factor C Yof the y

18、okes 13 Figure 6 Relative difference P SE= 100(P SST P EP ) / P EPversus magnetic polarization . 14 Figure 7 Relative difference P SE= 100(P SST P EP ) / P EPat 1,7 T determined by three standard laboratories, IEN, NPL and PTB, on S- and P-type g.-o. sample pairs . 14 Figure 8 Dispersion of manufact

19、urers grain-oriented material production in form of Epstein samples (PTB 1999) . 15 Figure 9 Example of scattering of the laboratories best estimates around the reference value (CGO sample No. 2, unweighted average, dash-dotted line) 18 Figure 10 Example of scattering of the laboratories best estima

20、tes around the reference value (HGO sample No. 4, unweighted average, dash-dotted line) 19 Figure 11 Example of scattering of the laboratories best estimates around the reference value (HGO sample No. 5, unweighted average, dash-dotted line) 19 Figure 12 Samples No. 1 to No. 5: ratio of SST to Epste

21、in power loss reference values P SE (J p ) = ( ) / at 50 Hz versus peak polarization 20 IEC TR 62981:2017 IEC 2017 3 Figure 13 Overall dispersion (all labs, J pvalues, and samples) of the laboratories best estimates P iof the power loss at 50 Hz around their reference values . 23 Figure 14 Overall d

22、ispersion (all labs, J pvalues, and samples) of the laboratories best estimates S iof the apparent power at 50 Hz around their reference values, with and without outliers . 24 Figure 15 Dispersion around the reference value of the laboratories best values of the power loss P measured at 50 Hz by the

23、 Epstein and the SST methods at 1,7 T 25 Figure 16 Dispersion around the reference value of the laboratories best values of the apparent power S measured at 50 Hz by the Epstein and the SST methods at 1,7 T . 26 Figure 17 Overall dispersion (European metrological laboratories only, all J pvalues and

24、 samples) of the laboratories best estimates P iof the power loss at 50 Hz around their reference values, with and without outliers 27 Figure 18 Dispersion of the laboratories best estimates of SST (a) and Epstein (b) power loss at 50 Hz 28 Figure 19 Dispersion of the laboratories best estimates of

25、SST (a) and Epstein (b) power loss at 50 Hz 29 Figure 20 Dispersion of the laboratories best estimates, represented by the standard deviation of SST (red) and Epstein (blue) power loss (a) and apparent power (b) at 50 Hz, versus the peak value of the polarization, J P , summarizing Figures 18 and 19

26、 . 30 Table 1 Participating laboratories . 16 Table 2 Circulated grain-oriented electrical steel test samples . 17 Table 3 Reference values at 50 Hz for the power loss P and the apparent power S 21 Table 4 Standard deviations associated with the reference values at 50 Hz for the power loss P and the

27、 apparent power S (Table 3) 22 Table 5 Reference values at 50 Hz of the polarization at H = 800 A/m J 800and standard deviation of the distribution of the laboratories best estimates . 22 Table 6 Relative standard deviations of 50 Hz power loss P and apparent power S distributions around their refer

28、ence values 27 4 IEC TR 62981:2017 IEC 2017 INTERNATIONAL ELECTROTECHNICAL COMMISSION _ STUDIES AND COMPARISONS OF MAGNETIC MEASUREMENTS ON GRAIN-ORIENTED ELECTRICAL STEELSHEET DETERMINED BY THE SINGLE SHEET TEST METHOD AND EPSTEIN TEST METHOD FOREWORD 1) The International Electrotechnical Commissio

29、n (IEC) is a worldwide organization for standardization comprising all national electrotechnical committees (IEC National Committees). The object of IEC is to promote international co-operation on all questions concerning standardization in the electrical and electronic fields. To this end and in ad

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40、 data of a different kind from that which is normally published as an International Standard, for example “state of the art“. IEC TR 62981, which is a technical report, has been prepared by IEC technical committee 68: Magnetic alloys and steels. The text of this technical report is based on the foll

41、owing documents: Enquiry draft Report on voting 68/535/DTR 68/543/RVC Full information on the voting for the approval of this technical report can be found in the report on voting indicated in the above table. IEC TR 62981:2017 IEC 2017 5 This publication has been drafted in accordance with the ISO/

42、IEC Directives, Part 2. The committee has decided that the contents of this publication will remain unchanged until the stability date indicated on the IEC website under “http:/webstore.iec.ch“ in the data related to the specific publication. At this date, the publication will be reconfirmed, withdr

43、awn, replaced by a revised edition, or amended. A bilingual version of this publication may be issued at a later date. IMPORTANT The colour inside logo on the cover page of this publication indicates that it contains colours which are considered to be useful for the correct understanding of its cont

44、ents. Users should therefore print this document using a colour printer. 6 IEC TR 62981:2017 IEC 2017 STUDIES AND COMPARISONS OF MAGNETIC MEASUREMENTS ON GRAIN-ORIENTED ELECTRICAL STEELSHEET DETERMINED BY THE SINGLE SHEET TEST METHOD AND EPSTEIN TEST METHOD 1 Scope This document, which is a Technica

45、l Report, provides the results of international exercises and comparisons focusing on achieving the knowledge of the statistical performance of single sheet tester (SST) measurements made on grain-oriented electrical steel. These experiments aim at specifying obligatory reference values, measured by

46、 the single sheet test method, for the grading of high permeability (P grades) grain-oriented (g.-o.) materials, independently from the Epstein classification as it is practiced today. Besides this, Epstein test measurements have been made in order to gain more up-to-date statistical performance for

47、 comparison with the SST statistical characteristics. A few experiments were carried out aiming at improved knowledge on the systematic error performance of the SST, i.e. they were to determine the correlation between the quality of insulation separating laminations in the SST yokes and the measured

48、 loss. There are various designations for “non-oriented electrical sheet steel“ and for “grain-oriented electrical sheet steel“ in use, for example in the IEC 60404 classification and specification standards, and there are also abbreviations like CGOS (for conventional grain-oriented steel) often us

49、ed in industry. In this report, the following designations and abbreviations are used: electrical steel as generic term; n.-o- electrical steel and g.-o. electrical steel as generic terms for these two types; S-type electrical streel or c. g.-o. electrical steel for “conventional grain-oriented electrical steel“; P-type g.-o. electrical steel or high-permeability g.-o. electrical steel; DR g.-o. electrical steel for “domain refined grain-