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
