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GB/T 20835-2024: Guide for magnetization test of generator stator core
Status: Valid GB/T 20835: Evolution and historical versions
| Standard ID | Contents [version] | USD | STEP2 | [PDF] delivered in | Standard Title (Description) | Status | PDF |
| GB/T 20835-2024 | English | 399 |
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Guide for magnetization test of generator stator core
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GB/T 20835-2024
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| GB/T 20835-2016 | English | 85 |
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Guides for Magnetization Test of Generator Stator Core
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GB/T 20835-2016
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| GB/T 20835-2007 | English | 359 |
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Guides for magnetic test of generator stator core
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GB/T 20835-2007
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PDF similar to GB/T 20835-2024
Basic data | Standard ID | GB/T 20835-2024 (GB/T20835-2024) | | Description (Translated English) | Guide for magnetization test of generator stator core | | Sector / Industry | National Standard (Recommended) | | Classification of Chinese Standard | K20 | | Word Count Estimation | 20,229 | | Date of Issue | 2024-08-23 | | Date of Implementation | 2024-08-23 | | Issuing agency(ies) | State Administration for Market Regulation, China National Standardization Administration | GB/T 20835-2024: Guide for magnetization test of generator stator core---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.
National Standard of the People's Republic of China
ICS 29.160.20CCS K 20
Guidelines for generator stator core magnetization test
2024-08-23 Release
2025-03-01 Implementation
State Administration for Market Regulation
The National Standardization Administration issued
Replace GB/T 20835-2016
Table of Contents
Preface Ⅲ
1 Scope...1
2 Normative references ...1
3 Terms and Definitions 1
4 Symbols...2
5 Preliminary calculations 3
5.1 Cross-sectional area of stator core yoke 3
5.2 Stator core yoke mass 3
5.3 Number of turns of the excitation coil and the excitation current 3
5.4 Test power supply capacity 4
5.5 Test coil voltage ...4
6 Test requirements 4
6.1 Test site 4
6.2 Test power supply 4
6.3 Measuring instruments and meters 4
6.4 Excitation coil 5
6.5 Test Coil ...5
7 Test methods 5
7.1 Pre-test inspection 5
7.2 Test Wiring 5
7.3 Initial temperature measurement 6
7.4 Monitoring during the test 6
7.5 Measurement of magnetic flux density 6
7.6 Measurement of stator core loss 6
7.7 Magnetic Flux Density and Time 7
7.8 Test Records 9
7.9 Preparation of test report 9
7.10 Post-test inspection 9
8 Quality judgment...9
8.1 Limit of maximum temperature rise of stator core 9
8.2 Limit of the maximum temperature difference in the same part of the stator core 9
Appendix A (Informative) Low flux eddy current testing method 10
Appendix B (Informative) Stator core ratio total loss 11
B.1 Conversion of stator core ratio to total loss 11
B.2 Reference for determining the total loss of stator core ratio 11
Appendix C (Informative) Test report contents 12
C.1 Basic Information 12
C.2 Stator core design data 12
C.3 Test equipment and instruments 12
C.4 Basic Data 12
C.5 Test data 12
C.6 Test results 12
Foreword
This document is in accordance with the provisions of GB/T 1.1-2020 "Guidelines for standardization work Part 1.Structure and drafting rules for standardization documents"
Drafting is required.
This document replaces GB/T 20835-2016 "Guidelines for magnetization test of generator stator core". Compared with GB/T 20835-2016,
In addition to structural adjustments and editorial changes, the main technical changes are as follows.
a) The scope has been changed (see Chapter 1, Chapter 1 of the.2016 edition);
b) Added a chapter on “Terms and Definitions” (see Chapter 3);
c) The provisions of f0, Ps(1.0) and Ps(1.4) in symbols have been changed (see Chapter 4, Chapter 3 of the.2016 edition);
d) The reference content for kFe value has been changed (see 5.1, 4.1 of the.2016 edition);
e) Added the reference standard and value range of silicon steel sheet density ρ (see 5.2);
f) The actual number of turns of the excitation coil during the test, W1, is increased and should be adjusted according to the actual situation on site (see 5.3.1);
g) Added the requirement that the test power supply is a three-phase transformer and capacitor compensation is used (see 5.4);
h) Added the layout requirements for the excitation coil cable (see 6.4);
i) The reference standard for insulation resistance measurement value has been changed (see 6.4, 4.4.1 of the.2016 edition);
j) The test principle diagram in Figure 1 was changed (see 7.2, 6.1 of the.2016 edition);
k) Added monitoring content during the test (see 7.4);
l) Added the measurement of stator core loss (see 7.6);
m) Added test requirements for non-salient pole synchronous generators when subject to field test conditions (see 7.7.1.1);
n) Added correction for test flux density deviation (see 7.7.1.2);
o) The appendix test data correction was changed from appendix to the main text (see 7.7.1.2, Appendix B of the.2016 edition);
p) Added correction for test frequency deviation (see 7.7.1.3);
q) The contents in brackets in the same part of the generator stator core have been deleted (see 7.2 of the.2016 edition).
Please note that some of the contents of this document may involve patents. The issuing organization of this document does not assume the responsibility for identifying patents.
This document was proposed by the China Electrical Equipment Industry Association.
This document is under the jurisdiction of the National Technical Committee for Standardization of Large Generators (SAC/TC511).
This document was drafted by. Harbin Large Electric Motor Research Institute Co., Ltd., Harbin Electric Motor Factory Co., Ltd., Dongfang Electric Corporation
Motor Co., Ltd., Shanghai Electric Power Plant Equipment Co., Ltd. Shanghai Generator Factory, Huadian Electric Power Research Institute Co., Ltd. Northeast Branch,
China Southern Power Grid Electric Power Technology Co., Ltd., Zhejiang Fuchunjiang Hydropower Equipment Co., Ltd., Rundian Energy Science and Technology Co., Ltd., State Grid Hu
Electric Power Research Institute of Beiyang Electric Power Co., Ltd., Harbin National Hydropower Equipment Engineering Technology Research Center Co., Ltd., China Yangtze River Three
Inner Mongolia Branch of Xiaxia Group Co., Ltd., Wuxi Putian Iron Core Co., Ltd., Harbin Electric Power Equipment Co., Ltd., Hebei Fengning
Pumped Storage Power Generation Co., Ltd., China Southern Power Grid Peaking and Frequency Regulation Power Generation Co., Ltd. Energy Storage Research Institute, Shandong Qilu Electric Motor Manufacturing Co., Ltd., Fujian Quan
Yi Power Technology Co., Ltd., Suzhou Fanster Mechanical Technology Co., Ltd., Inner Mongolia Electric Power (Group) Co., Ltd., Inner Mongolia Electric Power
Research Institute branch.
The main drafters of this document are. Gou Zhide, Zhou Guanghou, Sun Yutian, Wang Jianjun, Zhang Zhengping, Cheng Deming, Tang Qiang, Yue Xiaoming, Chen Zhan, Wang Xiangyang,
Cui Yibo, Hu Gang, Ben Xipeng, Zou Zubing, Huang Hao, Yang Zhengfeng, Sheng Jun, Sun Wendong, Li Leqing, Li Lin, Guo Junjie, Xiang Yuan, Wang Lei.
The previous versions of this document and the documents it replaces are as follows.
--First published in.2007 as GB/T 20835-2007;
--First revised in.2016;
--This is the second revision.
Guidelines for generator stator core magnetization test
1 Scope
This document specifies the preliminary calculations, test requirements, test methods and quality judgment for the generator stator core magnetization test.
This document is applicable to non-salient pole synchronous generators and hydro-turbine generators with voltage levels of 6.3 kV and above, and is used for generator stator core quality
The same shall apply to other types of motors.
2 Normative references
The contents of the following documents constitute the essential clauses of this document through normative references in this document.
For referenced documents without a date, only the version corresponding to that date applies to this document; for referenced documents without a date, the latest version (including all amendments) applies to
This document.
GB/T 2521.1 Fully cold-rolled electrical steel Part 1.Grain non-oriented steel strip (sheet)
GB/T 2521.2 Full process cold rolled electrical steel Part 2.Grain oriented steel strip (sheet)
GB/T 2900.25 Electrical terminology - Rotating electrical machines
GB/T 9637 Electrical terminology magnetic materials and components
DL/T 5420 Guidelines for on-site assembly of hydro-generator stators
3 Terms and definitions
The terms and definitions defined in GB/T 2900.25, GB/T 9637 and the following apply to this document.
3.1
magnetization test of stator core
The excitation coil specially wound on the stator core is passed through the industrial frequency alternating current to generate a nearly saturated alternating magnetic field inside the core.
A test method to check the quality of stator core.
3.2
Excitation coil
In the stator core magnetization test, the conductor coils or loops wound around the stator core are used to generate the magnetic field.
3.3
Test coil search coil
In stator core magnetization testing, a conductor coil or loop used to detect or measure magnetic flux density.
[Source. GB/T 9637-2001, 221-04-38, modified]
3.4
Anza ampere-turns
The product of the number of turns in a distributed or concentrated winding (or coil) times the current (in amperes) passing through those windings (or coils).
[Source. GB/T 2900.25-2008, 411-46-02, modified]
3.5
Specific total loss
The total power absorbed by a given mass of uniformly magnetized material divided by that mass.
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