GB/T 20833-2007 in English

《GB/T 20833-2007旋转电机定子线棒及绕组局部放电的测量方法及评定导则》由TC26（全国旋转电机标准化技术委员会）归口，主管部门为中国电器工业协会。
本标准定义了旋转电机局部放电的术语，推荐的试验程序和仪器的一般要求，试验方法，试验结果和试验的评价标准。本标准适用于电压等级6kV及以上槽部有防晕层的线棒或成型线圈的旋转电机，本标准的测量方法也适用于槽部无防晕层的电机，但测试结果会有不同，本标准不涉及此内容。

1 Scope

This standard is applicable to the 6kV or above rotating machinery equipped with bar or formed coil with coating at the slot part and the measurement method of this standard is also applicable to the machinery without coating at slot part, but different test results will be available which will not be involved in this standard.
This standard defines terms of partial discharge of rotating machinery, recommended test procedures and general requirements for the instruments, test methods, test results and evaluation criteria for the test. The partial discharge measurement shall cover:
a) Measuring system and instruments;
b) Arrangement of test circuits;
c) Standardization of test procedure;
d) Noise reduction;
e) Test result archives;
f) Test result evaluation.
This standard mainly specifies the electric measurement method using a 0.1Hz~400Hz a.c. power supply to make an off-line partial discharge measurement for stator winding of rotating machinery.

2 Normative References

The following normative documents contain provisions which, through reference in this text, constitute provisions of this standard. For dated reference, subsequent modification to (excluding any amendments), or revisions of, any of these publications do not apply. However, all parties coming to an agreement according to this Part are encouraged to study whether the latest edition of these documents is applicable. For undated references, the latest edition of the document referred to applies.

Foreword I
1 Scope 1
2 Normative References 1
3 Terms and Definitions 2
4 Partial Discharge Nature in Rotating Machinery 4
5 Measuring System and Instruments 6
6 Visualization of Measurement 8
7 Test Circuits 11
8 Standardized Measurement 15
9 Test Procedures 17
10 Evaluation on Test Results 22
11 Test Report 26
Appendix A (Normative) Evaluation Criteria 29
Appendix B (Informative) Detection and Localization of Partial Discharge with Non-electrical Measurement Method 30
Appendix C (Informative) On-line Measurement of Partial Discharge 31
Appendix D (Informative) External Noise, Disturbance and Sensitivity 33
Appendix E (Informative) Noise Suppression Method 35
Appendix F (Informative) Evaluation of Partial Discharge Data and Partial Discharge Pattern with Distinguishable Phase 40
Bibliography 43