METHOD AND DEVICE FOR DIAGNOSING DETERIORATION OF INSULATING LAYER

摘要

PROBLEM TO BE SOLVED: To improve the precision of the deterioration diagnosis of an insulating layer such as the coil of a rotating electric device. SOLUTION: The deterioration of insulating characteristics is evaluated from the attenuation rate of a generated sound or vibration generated at the time of striking an insulating layer regardless of any electric non-destructive characteristics. The relation of the attenuation rate of an acoustic wave or vibration with an insulating break-down voltage is preliminarily captured as basic characteristic graphics. The attenuation rate of the acoustic wave or vibrating waveform of the insulating layer to be detected is calculated, and the insulating break-down voltage is calculated by referring to the basic characteristics. Thus, the local deterioration of the insulating layer can be evaluated with high precision.