Deterioration diagnosis device, deterioration diagnosis system, and deterioration diagnosis method

Abstract

A deterioration diagnosis device (1) comprises an antenna (11), a signal processing unit (12), a score determination unit (13), and a deterioration determination unit (14). The antenna (11) receives electromagnetic waves of a microwave frequency band and generates a reception signal, said electromagnetic waves being emitted due to partial discharge that occurs in an insulation member of an electric motor (41). The signal processing unit (12) samples the reception signal in each sampling period and generates sampling data indicating the signal strength of the reception signal. The score determination unit (13) calculates, from the sampling data generated by the signal processing unit (12) during a detection period including a plurality of sampling periods, a score indicating the strength of the signal strength over the detection period. The deterioration determination unit (14) determines whether there is deterioration in the insulating member from a comparison between the score and a score reference value.