Verfahren zur Feststellung einer Unregelmäßigkeit für elektrische Ausrüstungen, insbesondere für eine rotierende elektrische Maschine, und eine Vorrichtung zur Durchführung des Verfahrens

摘要

Abnormality detecting apparatus for high voltage electrical equipment 70 measures the frequency spectrum 52, 53 of a signal detected by a partial discharge sensor 9, and detects a partial discharge signal having a frequency component in the neighbourhood of a resonance frequency determined on the basis of the electric equipment and its measuring circuit. In a rotating electric machine, a narrow band filter circuit 23 passes a frequency component around a resonance frequency determined on the basis of the length of the stator core to detect a partial discharge signal. Discharge may be caused by the presence of impurities or insulation aging. Identification of the resonant frequency enables location of the position of a fault. <IMAGE>