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GB/T 13789-2022Methods of measurement of the magnetic properties of electrical steel strip and sheet by means of a single sheet tester (English PDF)

用单片测试仪测量电工钢带(片)磁性能的方法

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Issued by

State Administration for Market Regulation, China National Standardization Administration

Level / Type

National · Recommended

Issue date

October 12, 2022

Implementation date

October 12, 2022

Scope

GB/T 13789-2022 is the English-translated version of 用单片测试仪测量电工钢带(片)磁性能的方法.

GB/T 13789-2022 is the Chinese standard "Methods of measurement of the magnetic properties of electrical steel strip and sheet by means of a single sheet tester".

Its scope clause reads: This document specifies the general rules and technical details for measuring the magnetic properties of electrical steel strip (sheet) with a single-chip tester, including methods A (current method) and Method B (Field Coil Method).

This document is applicable to. a) Grain oriented electrical steel strip (sheet) 1) Measured at the peak of 1.0T~1.8T magnetic polarization. --- Specific total loss; --- Specific apparent power; --- Effective value of magnetic field strength.

2) Measured at the peak value of the magnetic field strength not higher than 1000A/m. --- The peak value of the magnetic polarization; --- The peak value of the magnetic field strength. b) Grain-free oriented electrical steel strip (sheet) 1) Measured at the peak of the magnetic polarization of 0.8T~1.5T. --- Specific total loss; --- Specific apparent power; --- RMS value of excitation current.

2) Measured at the peak value of the magnetic field strength not higher than 10000A/m. --- The peak value of the magnetic polarization; --- The peak value of the magnetic field strength.

The single-chip tester specified in this document is suitable for measuring samples made of various types of electrical steel strips (sheets), and is suitable for use in specified magnetic polarization.

Magnetic properties were measured in a state where the intensity peak value, frequency, and induced voltage were sinusoidal waveforms. The measurement is carried out at an ambient temperature of 23°C±5°C, and the sample should be demagnetized before the test.

Under normal measurement conditions, the difference in magnitude between the above-mentioned differently defined physical quantities can be ignored.

Note 2.The magnetic field strength measurement of method A (current method) is based on the conventional magnetic path length, and the measurement is relative; the magnetic field strength measurement of method B (magnetic field coil method) is Direct; there is a certain difference in the results measured by the two methods.

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Document preview — GB/T 13789-2022

National Standard of the People's Republic of China

ICS: 17.220.20.29.030
Classification: H 21
Replacing: GB/T 13789-2008

Issued by: State Administration for Market Regulation, China National Standardization Administration

Preface
1 Scope
2 Normative references
3 Terms and Definitions
4 Method A (current method)
4.1 Overview
4.2 Permeameter
4.3 Air flux compensation
4.4 Sample
4.5 Power
4.6 Determination of specific total loss
4.7 Determination of magnetic field strength, excitation current and specific apparent power
5 Method B (Field Coil Method)
5.1 Principle
5.2 Determination of specific total loss
5.3 Determination of magnetic polarization, magnetic field strength and specific apparent power
6 Test report
Appendix A (informative) This document and IEC 60404-3.1992 structure number comparison list
Appendix B (informative) Technical differences between this document and IEC 60404-3.1992 and their reasons
Appendix C (Normative) Technical Requirements for Yoke Manufacturing
Appendix E (informative) Determination of magnetic properties by digital sampling method
Appendix F (informative) Validation and Calibration Scheme for Magnetic Measuring Equipment
Appendix G (informative) Digital method for controlling the sine wave of magnetic polarization intensity

1 Scope

This document specifies the general rules and technical details for measuring the magnetic properties of electrical steel strip (sheet) with a single-chip tester, including methods A (current method) and

Method B (Field Coil Method).

This document is applicable to.

a) Grain oriented electrical steel strip (sheet)

1) Measured at the peak of 1.0T~1.8T magnetic polarization.

--- Specific total loss;

--- Specific apparent power;

--- Effective value of magnetic field strength.

2) Measured at the peak value of the magnetic field strength not higher than 1000A/m.

--- The peak value of the magnetic polarization;

--- The peak value of the magnetic field strength.

b) Grain-free oriented electrical steel strip (sheet)

1) Measured at the peak of the magnetic polarization of 0.8T~1.5T.

--- Specific total loss;

--- Specific apparent power;

--- RMS value of excitation current.

2) Measured at the peak value of the magnetic field strength not higher than 10000A/m.

--- The peak value of the magnetic polarization;

--- The peak value of the magnetic field strength.

Magnetic properties were measured in a state where the intensity peak value, frequency, and induced voltage were sinusoidal waveforms.

The measurement is carried out at an ambient temperature of 23°C±5°C, and the sample should be demagnetized before the test.

Note 1.The "magnetic polarization" used in this document is defined in GB/T 9637.In some standards related to electrical steel, there is a use of "magnetic flux density" and the case of "magnetic induction". Under normal measurement conditions, the difference in magnitude between the above-mentioned differently defined physical quantities can be ignored.

Direct; there is a certain difference in the results measured by the two methods.

2 Normative references

The contents of the following documents constitute the essential provisions of this document through normative references in the text. Among them, dated references

For documents, only the version corresponding to the date is applicable to this document; for undated reference documents, the latest version (including all amendments) is applicable to this document.

GB/T 9637 Electrotechnical terms Magnetic materials and components [GB/T 9637-2001, eqvIEC 60050(221).1990]

GB/T 19289 Measurement method for electrical resistivity, density and packing coefficient of electrical steel strip (sheet) (GB/T 19289-2019,

IEC 60404-13.2018, IDT)

GB/T 8753.1 | GB/T 8753.2 | GB/T 8753.4 | GB/T 43894.2 | GB/T 13221 | […]

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This preview omits tables, figures, formulas and parts of the technical clauses. The complete document — 59 pages — is available in the English PDF.

Referenced standards

Normative references

IEC 60404

Cited by

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