| 摘要 |
PROBLEM TO BE SOLVED: To grasp insulation abnormality of each signal source and improve precision of insulation diagnosis during operation by specifying definition of discharge generation part from phase characteristic obtained by branching a signal detected by a partial discharge sensor, and discriminating a signal from a plurality of discharge source for each signal source. SOLUTION: This detecting method branches a signal detected with a partial discharge sensor installed in an electric rotating machine, filters the branched signals with different narrow band filter circuits, obtains two frequencies signal intensity correlation characteristic from the two frequencies signal intensity which are filtered and measured, classifies the signal into signal groups wherein two frequencies signal intensity ratio is in a constant range on the basis of the correlation characteristic, and specifies partial discharge and noise by using the phase characteristic operated and processed for each occurrence number frequency distribution of the classified signal groups. |
