Partial discharge measurement apparatus, partial discharge measurement method, and partial discharge measurement system

A partial discharge measurement method of detecting partial discharge generated in a generator supplying or receiving power via an insulated conductor, the method comprising:

• supplying a calibration signal to a surface of an insulating layer of the insulated conductor;
• compensation-processing of using an output signal of a sensor arranged in a noncontact manner with the insulated conductor when the calibration signal has been supplied to generate a compensation coefficient;
• and
• signal-processing of processing the output signal of the sensor based on the compensation coefficient.

A partial discharge measurement system comprising:

• a rotating electrical machine including a stator coil and a rotor arranged in a casing;
• an insulated conductor connected to the stator coil;
• a conductor protection cover arranged in the casing so as to surround at least a part of the insulated conductor;
• a sensor arranged on a side of the conductor of the conductor protection cover and configured to measure a physical quantity regarding partial discharge generated in the rotating electrical machine;
• and
• a signal processor configured to process an output signal of the sensor.