IEC 60404-10:2016

Magnetic materials - Part 10: Methods of measurement of magnetic properties of electrical steel strip and sheet at medium frequencies

IEC 60404-10:2016(E) 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 to 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. 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 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 condition of the higher frequencies;
d) revision of the capacitive coupling of mutual inductor windings together with the consideration of the alternative method of numerical air flux compensation.
The contents of the corrigendum of March 2018 have been included in this copy.

General Information

• Status: Published
• Publication Date: 23-Oct-2016
• ICS: 01 - GENERALITIES. TERMINOLOGY. STANDARDIZATION. DOCUMENTATION
• ICS: 29.030 - Magnetic materials
• Technical Committee: TC 68 - Magnetic alloys and steels
• Drafting Committee: WG 2 - TC 68/WG 2
• Current Stage: PPUB - Publication issued
• Start Date: 31-Dec-2016
• Completion Date: 24-Oct-2016

Relations

• Corrected By: IEC 60404-10:2016/COR1:2018 - Corrigendum 1 - Magnetic materials - Part 10: Methods of measurement of magnetic properties of electrical steel strip and sheet at medium frequencies
• Effective Date: 05-Sep-2023

Standards Content (Sample)

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

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 IEC's 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.: [phone]
3, rue de Varembé Fax: [phone]
CH-1211 Geneva 20 [e-mail]
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.

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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

INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
ICS 29.030 ISBN 978-2-8322-3672-7

– 2 – IEC 60404-10:2016 © 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 compensation . 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 . 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.
value 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
ˆ
6.3.1 Peak value of magnetic polarization J . 15
6.3.2 RMS value of the magnetizing current (of the magnetic field strength) . 16
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 . 18
n
6.4.5 Mutual inductor M . 18
D
6.5 Measuring procedure . 18
ˆ
6.6 Determination of the peak value of magnetic polarization J . 18
~
6.7 Determination of the r.m.s. value of magnetic field strength H . 19
ˆ
6.8 Determination of the peak value of magnetic field strength H . 19

6.9 Determination of the specific apparent power S . 20
s
6.10 Reproducibility . 21
7 Test report . 21
Annex 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
Bibliography . 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
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 frequencies

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 standardization in the electrical and electronic fields. To
this end and in addition to other activities, IEC publishes International Standards, Technical Specifications,
Technical Reports, Publicly Available Specifications (PAS) and Guides (hereafter referred to as “IEC
Publication(s)”). Their preparation is entrusted to technical committees; any IEC National Committee interested
in the subject dealt with may participate in this preparatory work. International, governmental and non-
governmental organizations liaising with the IEC also participate in this preparation. IEC collaborates closely
with the International Organization for Standardization (ISO) in accordance with conditions determined by
agreement between the two organizations.
2) The formal decisions or agreements of IEC on technical matters express, as nearly as possible, an international
consensus of opinion on the relevant subjects since each technical committee has representation from all
interested IEC National Committees.
3) IEC Publications have the form of recommendations for international use and are accepted by IEC National
Committees in that sense. While all reasonable efforts are made to ensure that the technical content of IEC
Publications is accurate, IEC cannot be held responsible for the way in which they are used or for any
misinterpretation by any end user.
4) In order to promote international uniformity, IEC National Committees undertake to apply IEC Publications
transparently to the maximum extent possible in their national and regional publications. Any divergence
between any IEC Publication and the corresponding national or regional publication shall be clearly indicated in
the latter.
5) IEC itself does not provide any attestation of conformity. Independent certification bodies provide conformity
assessment 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, employees, 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 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 the 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 tech
...

IEC 60404-10 ®
Edition 2.0 2016-10
REDLINE VERSION
INTERNATIONAL
STANDARD
colour
inside
Magnetic materials –
Part 10: Methods of measurement of magnetic properties of magnetic electrical
steel strip and sheet at medium frequencies

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 IEC's 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.: [phone]
3, rue de Varembé Fax: [phone]
CH-1211 Geneva 20 [e-mail]
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 Electropedia - www.electropedia.org
The stand-alone application for consulting the entire The world's leading online dictionary of electronic and
bibliographical information on IEC International Standards, electrical terms containing 20 000 terms and definitions in
Technical Specifications, Technical Reports and other English and French, with equivalent terms in 15 additional
documents. Available for PC, Mac OS, Android Tablets and languages. Also known as the International Electrotechnical
iPad. Vocabulary (IEV) online.

IEC publications search - www.iec.ch/searchpub IEC Glossary - std.iec.ch/glossary
The advanced search enables to find IEC publications by a 65 000 electrotechnical terminology entries in English and
variety of criteria (reference number, text, technical French extracted from the Terms and Definitions clause of
committee,…). It also gives information on projects, replaced IEC publications issued since 2002. Some entries have been
and withdrawn publications. collected from earlier publications of IEC TC 37, 77, 86 and

CISPR.
IEC Just Published - webstore.iec.ch/justpublished
Stay up to date on all new IEC publications. Just Published IEC Customer Service Centre - webstore.iec.ch/csc
details all new publications released. Available online and If you wish to give us your feedback on this publication or
also once a month by email. need further assistance, please contact the Customer Service
Centre: [e-mail].
IEC 60404-10 ®
Edition 2.0 2016-10
REDLINE VERSION
INTERNATIONAL
STANDARD
colour
inside
Magnetic materials –
Part 10: Methods of measurement of magnetic properties of magnetic electrical

steel strip and sheet at medium frequencies

INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
ICS 29.030 ISBN 978-2-8322-3725-0

– 2 – IEC 60404-10:2016 RLV © IEC 2016

CONTENTS
FOREWORD . 4
INTRODUCTION . 6
1 Field and scope of application .
2 Accuracy and reproducibility .
1 Scope . 7
4 Field of application .
2 Normative references . 7
3 Terms and definitions . 8
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 compensation . 11
4.6 Power supply . 12
10 Scope .
11 Field of application .
12 Principle of measurement .
13 Apparatus .
4.7 Voltage measurement . 13
4.7.1 General . 13
4.7.2 Average type voltmeter . 13
4.7.3 RMS voltmeter . 13
4.8 Current measurement . 13
4.9 Frequency measurement . 13
4.10 Power measurement . 13
5 Measuring Procedure for the determination of the specific total loss . 14
5.1 General . 14
5.2 Preparation for measurement . 14
5.3 Source setting Adjustment of power supply . 15
5.4 Measurements of power . 16
5.5 Determination of the specific total losses . 16
5.6 Reproducibility of the specific total loss measurement . 17
6 Procedure for the determination of the peak value of magnetic polarization, r.m.s.
value of magnetic field strength, peak value of magnetic field strength and specific
apparent power . 17
6.1 Scope General . 17
6.2 Test specimen . 17
6.3 Principle of measurement. 18
ˆ
6.3.1 Peak value of magnetic polarization J . 18
6.3.2 RMS value of the excitation magnetizing current (of the magnetic field
strength) . 18
6.3.3 Peak value of magnetic field strength . 18
6.4 Apparatus . 20
6.4.1 Average rectified voltage measurement . 20

6.4.2 Current measurement . 20
6.4.3 Peak current measurement . 20
6.4.4 Resistor R . 20
n
6.4.5 Mutual inductor M . 20
D
6.5 Measuring procedure . 20
21 Determination of characteristics .
ˆ
6.6 Determination of the peak value of magnetic polarization J . 21
~
6.7 Determination of the r.m.s. value of magnetic field strength H . 22

ˆ
6.8 Determination of the peak value of magnetic field strength H . 22
6.9 Determination of the specific apparent power S . 23
s
6.10 Reproducibility . 24
7 Test report . 24
Annex A (informative) Epstein frame for use at medium frequencies . 25
Annex B (informative) Digital sampling method for the determination of the magnetic
properties . 26
B.1 General . 26
B.2 Technical details and requirements . 26
B.3 Calibration aspects . 28
B.4 Numerical air flux compensation . 29
Bibliography . 30

Figure 1 – Double-lapped joints . 8
Figure 2 – The 25 cm Epstein frame . 10
Figure 3 – Circuit for the wattmeter method . 15
Figure 4 – Circuit for measuring r.m.s. value of the excitation magnetizing current . 18
Figure 5 – Circuit for measuring the peak value of magnetic field strength using a peak
voltmeter . 19
Figure 6 – Circuit for measuring the peak value of magnetic field strength using a
mutual inductor M . 19

– 4 – IEC 60404-10:2016 RLV © IEC 2016

INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
MAGNETIC MATERIALS –
Part 10: Methods of measurement of magnetic properties
of magnetic electrical steel strip and sheet at medium frequencies

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 standardization in the electrical and electronic fields. To
this end and in addition to other activities, IEC publishes International Standards, Technical Specifications,
Technical Reports, Publicly Available Specifications (PAS) and Guides (hereafter referred to as “IEC
Publication(s)”). Their preparation is entrusted to technical committees; any IEC National Committee interested
in the subject dealt with may participate in this preparatory work. International, governmental and non-
governmental organizations liaising with the IEC also participate in this preparation. IEC collaborates closely
with the International Organization for Standardization (ISO) in accordance with conditions determined by
agreement between the two organizations.
2) The formal decisions or agreements of IEC on technical matters express, as nearly as possible, an international
consensus of opinion on the relevant subjects since each technical committee has representation from all
interested IEC National Committees.
3) IEC Publications have the form of recommendations for international use and are accepted by IEC National
Committees in that sense. While all reasonable efforts are made to ensure that the technical content of IEC
Publications is accurate, IEC cannot be held responsible for the way in which they are used or for any
misinterpretation by any end user.
4) In order to promote international uniformity, IEC National Committees undertake to apply IEC Publications
transparently to the maximum extent possible in their national and regional publications. Any divergence
between any IEC Publication and the corresponding national or regional publication shall be clearly indicated in
the latter.
5) IEC itself does no
...