METHOD OF DETERMINING LOCATION AND TYPE OF DEFECTS IN ACTIVE PART OF ELECTRIC MACHINE IN OPERATING MODE Russian patent published in 2009 - IPC G01R31/34 

FIELD: physics.

SUBSTANCE: different sides of the outer surface of the body of the monitored object (electric machine) are fitted with at least four partial discharge measurement sensors, connected to recording apparatus. The sensors are moved in turns within the borders of the surface of the side of the body on which they are fitted until a maximum signal is received at the output of the sensor. The sensor is fixed on that position on the surface of the body. The output signal waveform of the sensor is recorded using the recording apparatus. After fixing the first sensor, the next sensors are fixed if their output signal waveforms coincide with that of the first sensor. The lag time of signals received by sensors from the first received signal is measured. Location of a defect is determined from the value of lag time, and the type of the discharge phenomenon is determined from the output signal waveform.

EFFECT: simple and reliable determination of location of a defect.

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