On-line partial discharge measurement of turbine generators with new noise rejection techniques on pulse-by-pulse basis

Conference · Tue Dec 31 04:00:00 EST 1996

OSTI ID:524604

Itoh, K; Kaneda, Y; Kitamura, S; Kimura, K ^[1]; Otoba, K; Tanaka, T; Tokura, H; Okada, I ^[2]

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1. Mitsubishi Electric Corp., Amagasaki, Hyogo (Japan)
2. Kansai Electric Power Co., Inc., Kita, Osaka (Japan)

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 and their reliability. The authors proposed 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 authors developed on-line partial discharge monitor for turbine generator with three noise rejection techniques on pulse-by-pulse basis. The first one is founded on the correlation between pulse height in two frequency bands. The second one is based on the correlation between pulse height from the two partial discharge sensors. The last one is noise gating. It was found that most pulses of noise were successfully rejected with the monitor in a trial.

• OSTI ID: 524604
• Report Number(s): CONF-960614--; ISBN 0-7803-3531-7
• Country of Publication: United States
• Language: English

Related Subjects

20 FOSSIL-FUELED POWER PLANTS
ELECTRIC DISCHARGES
ON-LINE MEASUREMENT SYSTEMS
SIGNAL-TO-NOISE RATIO
STATORS
TURBOGENERATORS