GB/T 39042-2020 English PDF

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GB/T 39042-2020: Measurement of the magnetic properties of electrical steels by means of a single sheet tester--H-coil method
Status: Valid

Standard ID	USD	BUY PDF	Lead-Days	Standard Title (Description)	Status
GB/T 39042-2020	339	Add to Cart	4 days	Measurement of the magnetic properties of electrical steels by means of a single sheet tester--H-coil method	Valid

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Basic data

Standard ID: GB/T 39042-2020 (GB/T39042-2020)
Description (Translated English): Measurement of the magnetic properties of electrical steels by means of a single sheet tester--H-coil method
Sector / Industry: National Standard (Recommended)
Classification of Chinese Standard: H21
Classification of International Standard: 77.040.99
Word Count Estimation: 18,155
Date of Issue: 2020-07-21
Date of Implementation: 2021-02-01
Issuing agency(ies): State Administration for Market Regulation, China National Standardization Administration

GB/T 39042-2020: Measurement of the magnetic properties of electrical steels by means of a single sheet tester--H-coil method

---This is a DRAFT version for illustration, not a final translation. Full copy of true-PDF in English version (including equations, symbols, images, flow-chart, tables, and figures etc.) will be manually/carefully translated upon your order.
Measurement of the magnetic properties of electrical steels by means of a single sheet tester--H-coil method ICS 77.040.99 H21 National Standards of People's Republic of China Electrical steel monolithic magnetic performance test H coil method 2020-07-21 released 2021-02-01 implementation State Administration for Market Regulation Issued by the National Standardization Management Committee

Table of contents

Foreword Ⅰ Introduction Ⅱ 1 Scope 1 2 Normative references 1 3 Terms and definitions 1 4 Measuring principle 1 5 Measuring device 1 5.1 General 1 5.2 Magnetic yoke 3 5.3 Coil 4 5.4 Power supply 6 5.5 Digital Control System 6 6 Sample 7 7 measurement 7 7.1 Preparation for measurement 7 7.2 Measurement of magnetic polarization 7 7.3 Measurement of magnetic field strength 8 7.4 Measurement of specific total loss 8 7.5 Measurement of specific apparent power 8 8 Test results and reproducibility 8 9 Test report 9 Appendix A (informative appendix) Digital sampling technology for measuring magnetic properties 10 Appendix B (informative appendix) Technical instructions for measuring electrical steel strip (piece) single-piece sample using H coil 11 Appendix C (informative appendix) Comparison of H-coil method and excitation current method to measure grain-oriented electrical steel strip (sheet) single specimen Case 12

Foreword

This standard was drafted in accordance with the rules given in GB/T 1.1-2009. This standard was proposed by the China Iron and Steel Association. This standard is under the jurisdiction of the National Steel Standardization Technical Committee (SAC/TC183). Drafting organizations of this standard. Wuhan Iron and Steel Co., Ltd., Jiangsu Shagang Iron and Steel Research Institute Co., Ltd., Changsha Tianheng Measurement and Control Technology Co., Ltd. Division, Metallurgical Industry Information Standards Institute. The main drafters of this standard. Xiangqian, Zhou Xinhua, Wu Shengjie, Huang Shuang, Wang Yujie, Ma Yunmin, Shu Ziqi, Zhang Junpeng, Liu Baoshi.

Introduction

This standard is based on the measurement of electrical engineering with a single-chip tester under the premise that the national electronic industry manufacturing level and accuracy have reached the international advanced level. The current status of the magnetic properties of steel strip (sheet) monolithic samples, in order to meet the development requirements of the magnetic performance measurement of electrical steel strip (sheet) monolithic samples, the proposed electrical steel A direct measurement method of the magnetic properties of a single-piece sample with (slice). Compared with GB/T 13789, the main differences between this standard are. ---The measurement principle is different. This standard recommends that the H coil is used to directly measure the magnetic field strength of a single piece of electrical steel strip (piece). The effective magnetic circuit length needs to be agreed again, which eliminates the systematic error caused by the effective magnetic circuit length, and the measured value is more than the total loss value. Close to the true value. And GB/T 13789 is usually called the "excitation current method". Under the agreed effective magnetic circuit length, adjust The B coil voltage is measured after the sample to be tested reaches the specified magnetic polarization intensity. This is an indirect measurement method. However, due to The effective magnetic circuit length is only an agreed value. With the deepening of research, it is found that the effective magnetic circuit length will vary with the material and Factors such as manufacturing process, samples and different test conditions are constantly changing, and the actual changed effective magnetic circuit length is consistent with the agreed effective magnetic circuit length The deviation of the degree brings the systematic error in the measurement, and the measurement result deviates from the true value. ---Different measurement results. After a large number of tests, the specific total loss and specific apparent power measured by this standard are significantly lower than GB/T 13789 recommended method measurement results, the measurement deviation is significantly related to the sample material, thickness, measurement conditions, etc., usually In the case of this standard, the grain-oriented electrical steel strip (sheet) single-piece sample measured under the conditions of power frequency and magnetic polarization intensity of 1.7T It is 5%~8% lower than the total loss and 10%~20% lower than the apparent power. Electrical steel monolithic magnetic performance test H coil method

1 Scope

This standard specifies that under power frequency conditions, the H coil is used to measure the magnetic field strength of a single piece of electrical steel strip (slice), and pass the single piece of magnetic Conductometer test method of electrical steel specific total loss, magnetic polarization intensity and specific apparent power. This standard applies to the detection of the magnetic properties of monolithic samples of grain-oriented or non-oriented electrical steel strips (sheets).

2 Normative references

The following documents are indispensable for the application of this document. For dated reference documents, only the dated version applies to this article Pieces. For undated references, the latest version (including all amendments) applies to this document. GB/T 2900.60 Electrotechnical terminology electromagnetics GB/T 3102.5 Quantities and units of electricity and magnetism GB/T 9637 Electrical Engineering Terminology Magnetic Materials and Components GB/T 13789 Method for measuring the magnetic properties of electrical steel sheets (bands) with a monolithic tester GB/T 19289 Method for measuring electrical resistivity, density and stacking coefficient of electrical steel strip (sheet)

3 Terms and definitions

The following terms and definitions defined in GB/T 2900.60, GB/T 3102.5, and GB/T 9637 apply to this document. 3.1 H coil H-coil An air-core coil placed near the surface of the sample to directly detect the true magnetic field strength of the sample.

4 Measuring principle

The sample and the yoke form a closed magnetic field loop, and the intensity of the magnetic field passing through the sample is obtained by detecting the induced voltage on the H coil. The magnetic polarization intensity is obtained by the induced voltage of the B coil (inductive voltage coil, also called the secondary coil), and the magnetic properties of the sample can be measured.

5 Measuring device

5.1 General The electrical steel sample is placed in the middle of the coil frame, the coil frame is wound with two layers of coils, and the outside is the excitation coil (also called the primary coil). The inside is a B coil, and a set of H coils are placed on the coil bobbin near the lower surface of the sample, as shown in Figure 1. ......

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