Partial discharge detection methods include the following:

1. The waves detectionIn partial discharge in high voltage switchgear insulation would produce electromagnetic wave, and switchgear metal shell will be this kind of electromagnetic wave shielding off a most, but there are still a few will be through the seam of the metal shell or spread liner, gas insulated switchgear and will create a wave through the surface to underground equipment metal shell. In the scope of the waves usually among a few millivolts until a few volts, rise time and there were a few nanoseconds. Probe can be set to the work state of the outer surface of the switch cabinet, to test the partial discharge activity.

2. The ultrasonic testingUltrasonic testing actually belongs to a kind of mechanical vibration wave, based on the Angle of energy, the bureau ?