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New noise rejection techniques on pulse-by-pulse basis for on-line partial discharge measurement of turbine generators

Journal Article · · IEEE Transactions on Energy Conversion
DOI:https://doi.org/10.1109/60.537029· OSTI ID:404682
; ; ;  [1]; ; ; ;  [2]
  1. Mitsubishi Electric Corp., Amagasaki, Hyogo (Japan)
  2. Kansai Electric Power Co., Inc., Kita, Osaka (Japan)
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On-line partial discharge tests for turbine generators are useful for recognizing abnormal or deteriorated stator winding insulation without a machine outage. One problem related to such a test is additional installation of sensors. The authors propose that wires of a resistance temperature detector (RTD) embedded in a stator slot are applied as a partial discharge sensor in the form of an RF coupler. The other problem is electrical noise that is a pulse similar to partial discharge in frequency characteristic and has higher amplitude than partial discharge. The sensors in two steam turbine generators showed enough sensitivity and broad frequency bandwidth to facilitate the elimination of noise from the partial discharge measurement. Two new techniques of noise rejection on pulse-by-pulse basis are investigated with the multiple sensors. One is founded on the correlation between pulse height in two frequency bands. The other is based on the correlation between pulse height from the two partial discharge sensors. It was found that each noise rejection technique was successful in a trial testing.
OSTI ID:
404682
Report Number(s):
CONF-960111--
Journal Information:
IEEE Transactions on Energy Conversion, Journal Name: IEEE Transactions on Energy Conversion Journal Issue: 3 Vol. 11; ISSN 0885-8969; ISSN ITCNE4
Country of Publication:
United States
Language:
English

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Related Subjects

24 POWER TRANSMISSION AND DISTRIBUTION
ELECTRIC GENERATORS
ELECTRICAL INSULATION
ELECTRICAL TRANSIENTS
NONDESTRUCTIVE TESTING
ON-LINE MEASUREMENT SYSTEMS
SIGNAL-TO-NOISE RATIO
STATORS
STEAM TURBINES