1、 IEC 60404-10 Edition 2.0 2016-10 INTERNATIONAL STANDARD Magnetic materials Part 10: Methods of measurement of magnetic properties of electrical steel strip and sheet at medium frequencies IEC 60404-10:2016-10(en) THIS PUBLICATION IS COPYRIGHT PROTECTED Copyright 2016 IEC, Geneva, Switzerland All ri
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11、 of electrical steel strip and sheet at medium frequencies INTERNATIONAL ELECTROTECHNICAL COMMISSION ICS 29.030 ISBN 978-2-8322-3672-7 Registered trademark of the International Electrotechnical Commission Warning! Make sure that you obtained this publication from an authorized distributor. 2 IEC 604
12、04-10:2016 IEC 2016 CONTENTS FOREWORD . 4 INTRODUCTION . 6 1 Scope 7 2 Normative references 7 3 Terms and definitions 7 4 General principle of a.c. measurements . 8 4.1 General . 8 4.2 Principle of the 25 cm Epstein frame method 8 4.3 Test specimen 8 4.4 The 25 cm Epstein frame 9 4.5 Air flux compen
13、sation 10 4.6 Power supply 11 4.7 Voltage measurement . 11 4.7.1 General . 11 4.7.2 Average type voltmeter 11 4.7.3 RMS voltmeter . 11 4.8 Current measurement . 12 4.9 Frequency measurement . 12 4.10 Power measurement . 12 5 Procedure for the determination of the specific total loss . 12 5.1 General
14、 . 12 5.2 Preparation for measurement 12 5.3 Adjustment of power supply 13 5.4 Measurements of power 14 5.5 Determination of the specific total loss 14 5.6 Reproducibility of the specific total loss measurement 15 6 Procedure for the determination of the peak value of magnetic polarization, r.m.s. v
15、alue of magnetic field strength, peak value of magnetic field strength and specific apparent power . 15 6.1 General . 15 6.2 Test specimen 15 6.3 Principle of measurement 15 6.3.1 Peak value of magnetic polarization J 15 6.3.2 RMS value of the magnetizing current (of the magnetic field strength) . 1
16、6 6.3.3 Peak value of magnetic field strength 16 6.4 Apparatus . 17 6.4.1 Average rectified voltage measurement . 17 6.4.2 Current measurement 17 6.4.3 Peak current measurement 17 6.4.4 Resistor R n. 18 6.4.5 Mutual inductor M D18 6.5 Measuring procedure 18 6.6 Determination of the peak value of mag
17、netic polarization J . 18 6.7 Determination of the r.m.s. value of magnetic field strength H . 19 6.8 Determination of the peak value of magnetic field strength H 19 IEC 60404-10:2016 IEC 2016 3 6.9 Determination of the specific apparent power S s. 20 6.10 Reproducibility 21 7 Test report . 21 Annex
18、 A (informative) Epstein frame for use at medium frequencies 22 Annex B (informative) Digital sampling method for the determination of the magnetic properties . 23 B.1 General . 23 B.2 Technical details and requirements . 23 B.3 Calibration aspects . 25 B.4 Numerical air flux compensation . 26 Bibli
19、ography 27 Figure 1 Double-lapped joints 8 Figure 2 The 25 cm Epstein frame . 9 Figure 3 Circuit for the wattmeter method 13 Figure 4 Circuit for measuring r.m.s. value of the magnetizing current . 16 Figure 5 Circuit for measuring the peak value of magnetic field strength using a peak voltmeter 16
20、Figure 6 Circuit for measuring the peak value of magnetic field strength using a mutual inductor M . 17 4 IEC 60404-10:2016 IEC 2016 INTERNATIONAL ELECTROTECHNICAL COMMISSION _ MAGNETIC MATERIALS Part 10: Methods of measurement of magnetic properties of electrical steel strip and sheet at medium fre
21、quencies FOREWORD 1) The International Electrotechnical Commission (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 standardizati
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28、sessment services and, in some areas, access to IEC marks of conformity. IEC is not responsible for any services carried out by independent certification bodies. 6) All users should ensure that they have the latest edition of this publication. 7) No liability shall attach to IEC or its directors, em
29、ployees, servants or agents including individual experts and members of its technical committees and IEC National Committees for any personal injury, property damage or other damage of any nature whatsoever, whether direct or indirect, or for costs (including legal fees) and expenses arising out of
30、the publication, use of, or reliance upon, this IEC Publication or any other IEC Publications. 8) Attention is drawn to the Normative references cited in this publication. Use of the referenced publications is indispensable for the correct application of this publication. 9) Attention is drawn to th
31、e possibility that some of the elements of this IEC Publication may be the subject of patent rights. IEC shall not be held responsible for identifying any or all such patent rights. International Standard IEC 60404-10 has been prepared by IEC technical committee 68: Magnetic alloys and steels. This
32、second edition cancels and replaces the first edition published in 1988. This edition constitutes a technical revision. This edition includes the following significant technical changes with respect to the previous edition: a) adaption to modern measurement and evaluation methods, in particular the
33、introduction of the widely spread digital sampling method for the acquisition and evaluation of the measured data; b) introduction of formal changes which adapt this standard to other standards of the 60404 series; c) revision of the problem of the air flux compensation taking account of the conditi
34、on of the higher frequencies; IEC 60404-10:2016 IEC 2016 5 d) revision of the capacitive coupling of mutual inductor windings together with the consideration of the alternative method of numerical air flux compensation. The text of this standard is based on the following documents: CDV Report of vot
35、ing 68/523/CDV 68/556/RVC Full information on the voting for the approval of this standard can be found in the report on voting indicated in the above table. This publication has been drafted in accordance with the ISO/IEC Directives, Part 2. A list of all parts in the IEC 60404 series, published un
36、der the general title Magnetic materials, can be found on the IEC website. 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 thi
37、s date, the publication will be reconfirmed, withdrawn, replaced by a revised edition, or amended. A bilingual version of this publication may be issued at a later date. 6 IEC 60404-10:2016 IEC 2016 INTRODUCTION Besides the fact that the first edition of this part of IEC 60404 is more than 25 years
38、old, the main purpose of this revision is to adapt it to modern measurement and evaluation methods, in particular to introduce the widely spread digital sampling method for the acquisition and evaluation of the measured data. In addition, the problem of the air flux compensation had to be re-conside
39、red under the condition of the elevated frequencies. Capacitive coupling of mutual inductor windings require observance of significant phase shift influence and suggest consideration of the alternative method of numerical air flux compensation. An increase of the frequency range to 20 kHz was discus
40、sed by TC 68 since some manufacturers of electrical steel include this range in their catalogues. However, TC 68 decided to keep the frequency range to that defined in IEC 60404-10:1988: 400 Hz to 10 kHz. IEC 60404-10:2016 IEC 2016 7 MAGNETIC MATERIALS Part 10: Methods of measurement of magnetic pro
41、perties of electrical steel strip and sheet at medium frequencies 1 Scope This part of IEC 60404 is applicable to grain-oriented and non-oriented electrical steel strip and sheet for measurements of a.c. magnetic properties in the frequency range 400 Hz to 10 000 Hz. The object of this document is t
42、o define the general principles and the technical details of the measurement of magnetic properties of electrical steel strip and sheet by means of an Epstein frame. The Epstein frame is applicable to test specimens obtained from electrical steel strips and sheets of any grade. The AC magnetic chara
43、cteristics are determined for sinusoidal induced voltages, for specified peak values of magnetic polarization and for a specified frequency. The measurements are to be made at an ambient temperature of (23 5)C on test specimens which have first been demagnetized. NOTE Throughout this document the te
44、rm “magnetic polarization“ is used as defined in IEC 60050-221. In some standards of the IEC 60404 series, the term “magnetic flux density“ was used. 2 Normative references The following documents are referred to in the text in such a way that some or all of their content constitutes requirements of
45、 this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies. IEC 60050-121, International Electrotechnical Vocabulary Part 121: Electromagnetism IEC 60050-221, International Electrotech
46、nical Vocabulary Chapter 221: Magnetic materials and components IEC 60404-8 (all parts), Magnetic materials Part 8: Specifications for individual materials IEC 60404-13, Magnetic materials Part 13: Methods of measurement of density, resistivity and stacking factor of electrical steel sheet and strip
47、 3 Terms and definitions For the purposes of this document, the terms and definitions given in IEC 60050-221 and IEC 60050-121 apply. ISO and IEC maintain terminological databases for use in standardization at the following addresses: IEC Electropedia: available at http:/www.electropedia.org/ ISO On
48、line browsing platform: available at http:/www.iso.org/obp 8 IEC 60404-10:2016 IEC 2016 4 General principle of a.c. measurements 4.1 General Clause 4 specifies the general conditions for the determination of a.c.magnetic properties of electrical steel strip and sheet by means of the 25 cm Epstein fr
49、ame. 4.2 Principle of the 25 cm Epstein frame method The 25 cm Epstein frame, which comprises a primary winding, a secondary winding and the specimen to be tested as a core, forms an unloaded transformer whose characteristics are measured by the method described in the following subclauses 4.3 to 4.10. At the higher end of the frequency range, a specially constructed Epstein frame (see Annex A) may be required in which the interwinding capacitances are low, so that the capacitiv
