DocumentCode :
1896715
Title :
On-line measurement of partial discharges on large motors in a generating station
Author :
Culbert, I.M. ; Dhirani, H. ; Gupta, B.K.
Author_Institution :
Ontario Power Generation, Toronto, Ont., Canada
fYear :
2001
fDate :
2001
Firstpage :
537
Lastpage :
540
Abstract :
For several decades, off-line and/or on-line partial discharge (PD) measurements have been used for condition assessment of stator insulation systems in motors and generators. Many large critical motors in fossil and nuclear generating stations have surge capacitors installed on their phase terminals. On-line PD measurements on eight such motors were done without contact with high voltage terminals in Ontario Power Generation (OPG, earlier Ontario Hydro) by installing high (or radio) frequency current transformers (HFCT or RFCT) and line frequency current transformers (LFCT) on the grounding leads of the surge capacitors. The PD and line frequency voltage signals were picked from the HFCT and the LFCT, respectively. Passive filters were used to eliminate interference from high magnitude pulses generated by exciters in the generating station. A commercial instrument analyzed the PD pulses in terms of magnitude and relationship to the phase of the line voltage. Measurements have been repeated several times. This paper presents the the results obtained so far. Separate off-line tests on a similar motor showed that the HFCT method is at least as sensitive as the conventional OPG method, which uses a capacitive coupler, a wide-band filter, and an oscilloscope
Keywords :
capacitors; current transformers; electric motors; exciters; insulation testing; interference suppression; machine insulation; partial discharge measurement; passive filters; Ontario Power Generation; PD signals; capacitive coupler; exciters; fossil generating stations; grounding leads; high frequency current transformers; high magnitude pulses; interference elimination; line frequency current transformers; line frequency voltage signals; motors; nuclear generating stations; on-line partial discharge measurements; oscilloscope; passive filters; phase terminals; radio frequency current transformers; stator insulation condition assessment; surge capacitors; wide-band filter; Capacitors; Current transformers; Frequency; Nuclear power generation; Partial discharge measurement; Partial discharges; Pulse generation; Pulse transformers; Stators; Surges;
fLanguage :
English
Publisher :
ieee
Conference_Titel :
Electrical Insulation Conference and Electrical Manufacturing & Coil Winding Conference, 2001. Proceedings
Conference_Location :
Cincinnati, OH
ISSN :
0362-2479
Print_ISBN :
0-7803-7180-1
Type :
conf
DOI :
10.1109/EEIC.2001.965754
Filename :
965754
Link To Document :
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