| 摘要 |
PROBLEM TO BE SOLVED: To easily discriminate a signal arising from partial discharge from an electric device to be measured from a continuous noise signal, and to discriminate it from a pulse-shaped noise signal similar to that of partial discharge. SOLUTION: A partial discharge detection sensor 11 disposed at the electric device to be measured and measuring a pulse current generated accompanied by the partial discharge is provided. The signal detected by the sensor 11 is amplified by an amplifier 12, A-D converted by an A-D converter 13, and supplied to a time-frequency analysis part 14 so as to be analyzed and processed. After the analysis processing, the signal is sent to a signal extraction part 15 for first time analysis, then supplied to a signal processing part 16 for second time analysis, and sent to a determination part 17 for third time analysis. The signal sent to the determination part 17 is compared with data stored in advance in a diagnosis database 18 to determine whether the signal is the partial discharge signal. COPYRIGHT: (C)2010,JPO&INPIT |
