On-line monitoring method of switchgear

Switch cabinet online monitoring method, switch cabinet operation process, insulation materials will be affected by high temperature, high pressure, oil, chemical substances, oscillation and other aspects of the effect, insulation performance continues to deteriorate, accelerate the speed of partial discharge, in turn, partial discharge and the deterioration of insulation play a role in promoting the effect. Therefore, detecting the partial discharge of the switch cabinet can be useful to prevent faults.
For the switchgear, the partial discharge detection method includes the following: electromagnetic waves will occur when partial discharge occurs in the insulation layer of the high-voltage switchgear, and the metal shell of the switchgear will shield a large part of this electromagnetic wave, but there is still a small part of the metal shell or gas insulated switch liner spread out.
And there will be a ground wave through the equipment metal shell outside the surface to the ground. Earth waves usually range from a few millivolts to the middle of a few volts, and there are several nanoseconds during the rise. Partial discharge activity can be detected by setting the probe on the exterior of the switch cabinet in the operating condition.
In fact, ultrasonic detection belongs to a kind of mechanical oscillation wave, according to the perspective of energy, the process of partial discharge is the process of instantaneous burst of energy, electrical energy is released through the form of sound energy, light energy, heat energy and electromagnetic energy, electrical breakdown occurs in the air gap, instant discharge can be completed, at the moment electrical energy will be converted into heat energy for a while, The gas in the discharge center will expand under the effect of heat energy and propagate outward through sound waves.