GB/T 3655-2022 PDF English
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| Standard ID | Contents [version] | USD | STEP2 | [PDF] delivery | Name of Chinese Standard | Status |
| GB/T 3655-2022 | English | 485 |
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Methods of measurement of the magnetic properties of electrical steel strip and sheet by means of an epstein frame
| Valid |
| GB/T 3655-2008 | English | 714 |
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Methods of measurement of the magnetic properties of electrical steel sheet and strip by means of Epstein frame
| Obsolete |
| GB/T 3655-2000 | English | 559 |
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Methods of measurement of the magnetic properties of electrical steel sheet and strip by means of an Epstein frame
| Obsolete |
| GB/T 3655-1992 | English | 839 |
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6 days
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Magnetic sheet and strip - Methods of measurement of magnetic electrical physical properties
| Obsolete |
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GB/T 3655-2022: Methods of measurement of the magnetic properties of electrical steel strip and sheet by means of an epstein frame
---This is an excerpt. Full copy of true-PDF in English version (including equations, symbols, images, flow-chart, tables, and figures etc.), auto-downloaded/delivered in 9 seconds, can be purchased online: https://www.ChineseStandard.net/PDF.aspx/GBT3655-2022
GB
NATIONAL STANDARD OF THE
PEOPLE’S REPUBLIC OF CHINA
ICS 77.404.99
CCS H 21
Replacing GB/T 3655-2008
Methods of measurement of the magnetic properties of
electrical steel strip and sheet by means of an Epstein frame
(IEC 60404-2.1996, Magnetic materials - Part 2.Methods of measurement of
the magnetic properties of electrical steel sheet and strip by means of an
Epstein frame, MOD)
Issued on. OCTOBER 12, 2022
Implemented on. OCTOBER 12, 2022
Issued by. State Administration for Market Regulation;
Standardization Administration of the People's Republic of China.
Table of Contents
Foreword... 4
1 Scope... 6
2 Normative references... 6
3 Terms and definitions... 7
4 General rules for AC measurements... 7
4.1 Principle of 25 cm Epstein frame method... 7
4.2 Specimen... 7
4.3 25 cm Epstein frame... 8
4.4 Air flux compensation... 10
4.5 Power supply... 11
4.6 Voltage measurement... 12
4.7 Frequency measurement... 12
4.8 Power meter... 12
5 Measurement steps for specific total loss... 13
5.1 Preparation for measurement... 13
5.2 Power regulation... 13
5.3 Power measurement... 14
5.4 Calculation of specific total loss... 15
5.5 Reproducibility of specific total loss measurement... 16
6 Determination of peak value of magnetic polarization, effective value of magnetic
field strength, peak value of magnetic field strength and specific apparent power... 16
6.1 Specimen... 16
6.2 Measurement... 16
6.3 Reproducibility... 20
7 General rules for DC measurement... 21
7.1 Principle of 25 cm Epstein frame method... 21
7.2 Specimen... 21
7.3 25 cm Epstein frame... 21
7.4 Air flux compensation... 21
7.5 Power supply... 21
7.6 Device accuracy... 21
8 Determination of DC magnetic polarization... 22
8.1 Preparation for measurement... 22
8.2 Determination of magnetic polarization... 22
8.3 Determination of hysteresis loop... 24
8.4 Reproducibility of magnetic polarization measurements... 24
9 Test report... 24
Annex A (informative) Comparison on structural numbers between this document and
IEC 60404-2.1996... 26
Annex B (informative) Technical differences between this document and IEC 60404-
2.1996 and their reasons... 27
Annex C (informative) Digital sampling method for magnetic properties measurement
... 29
Annex D (informative) Confirmation and calibration scheme for magnetic
measurement equipment... 34
Annex E (informative) Control on the sinusoidal waveform of magnetic polarization by
digital method... 42
Bibliography... 44
Foreword
This document was drafted in accordance with the rules given in GB/T 1.1-2020
"Directives for standardization - Part 1.Rules for the structure and drafting of
standardizing documents".
This document replaces GB/T 3655-2008 "Methods of measurement of the magnetic
properties of electrical steel sheet and strip by means of Epstein frame". Compared with
GB/T 3655-2008, in addition to the structural adjustments and editorial changes, the
main technical changes in this document are as follows.
a) Add "For the convenience of automatic loading and unloading of specimens...shall
be indicated in the test report" (see 4.3 of this Edition);
b) Delete the requirements that the frame structure shall meet (see 3.3 of Edition
2008).
The modification of this document adopts IEC 60404-2.1996 "Magnetic materials - Part
2.Methods of measurement of the magnetic properties of electrical steel sheet and strip
by means of an Epstein frame".
Compared with IEC 60404-2.1996, there are many structural adjustments in this
document. See Annex A for a list of structure number changes between the two
documents.
Compared with IEC 60404-2.1996, this document has many technical differences. A
single vertical line (|) is used to mark the outer margin of the terms involved. See Annex
B for a list of these technical differences and their reasons.
The following editorial changes have been made to this document.
- To coordinate with the existing standard, the name of the standard is changed to
"Methods of measurement of the magnetic properties of electrical steel strip and
sheet by means of an Epstein frame";
- Incorporate the amendments of IEC 60404-2.1996/Amd.1.2008 and the corrigenda
of IEC 60404-2.1996/Cor.1.2018.The position of the outer margin of the clause
involved is marked with a vertical double line (ǁ);
- Add Annex D (Informative) Confirmation and calibration scheme for magnetic
measuring equipment;
- Add Annex E (informative) Control on the sinusoidal waveform of magnetic
polarization by digital method.
Attention is drawn to the possibility that some of the elements of this document may be
the subject of patent rights. The issuing authority shall not be held responsible for
identifying any or all such patent rights.
This document was proposed by China Iron and Steel Association.
This document shall be under the jurisdiction of National Technical Committee on Steel
of Standardization Administration of China (SAC/TC 183).
The drafting organizations of this document. Baoshan Iron and Steel Co., Ltd.,
Changsha Tianheng Measurement and Control Technology Co., Ltd., Metallurgical
Industry Information Standard Research Institute, Shougang Zhixin Qian'an
Electromagnetic Materials Co., Ltd., Hunan Provincial Institute of Metrology and
Testing, Global Energy Internet Research Institute Co., Ltd.
Main drafters of this document. Tang Ling, Zhou Xinhua, Wang Yujie, Shen Jie, Gong
Jian, Liu Baoshi, Xu Yu, Chen Xin, Zhou Xing, Shu Ziqi, Liu Zhaoyue, Ma Guang,
Xiangqian.
This document was first published in 1983.The first revision was in 1992.The second
revision was in 2000.The third revision was in 2008.This is the fourth revision.
Methods of measurement of the magnetic properties of
electrical steel strip and sheet by means of an Epstein frame
1 Scope
This document specifies the general rules and technical details for measuring the
magnetic properties of electrical steel strip (sheet) by means of an Epstein frame.
2 Normative references
The following referenced documents are indispensable for the application of this
document. For dated references, only the edition cited applies. For undated references,
the latest edition of the referenced document (including any amendments) applies.
3 Terms and definitions
For the purposes of this document, the terms and definitions defined in GB/T 2900.60
and GB/T 9637apply.
4 General rules for AC measurements
The number of sample pieces that make up the specimen shall be an integer multiple of
4 and comply with the relevant product standards. For a specimen with a length of 280
mm, the effective mass of the specimen is at least 240 g, see formula (1).
5 Measurement steps for specific total loss
The specimen to be tested shall be under a demagnetizing field with an initial magnetic
field higher than the previous test field. Gradually reduce the AC magnetic field for
demagnetization.
6 Determination of peak value of magnetic polarization, effective value of magnetic field strength, peak value of magnetic field
strength and specific apparent power
The peak value of the magnetic field strength shall be obtained from the peak value
of the excitation current. Use the peak value voltmeter shown in Figure 5.
7 General rules for DC measurement
The power supply shall provide a rated current capable of producing the required
maximum magnetic field strength. Its corrugation factor shall be less than 1%.
8 Determination of DC magnetic polarization
The specimen shall be demagnetized. That is, demagnetization is performed under a
continuously decreasing AC magnetic field, or through a gradually decreasing and
commutated DC current in the primary coil of the Epstein frame.
9 Test report
The test report shall contain the following.
Annex A
(informative)
Comparison on structural numbers between this document and IEC 60404-
2.1996
Annex B
(informative)
Technical differences between this document and IEC 60404-2.1996 and their
reasons
......
Source: Above contents are excerpted from the full-copy PDF -- translated/reviewed by: www.ChineseStandard.net / Wayne Zheng et al.
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