Discharge generally refers to the transition of insulator from an insulating state to a conductive state under the action of an electric field.
This jump phenomenon may occur in a "punch-like" manner between the electrodes, ie, the insulating material is completely short-circuited and destroyed. At this time, the voltage between the electrodes rapidly drops to a very low or near zero value; It may also occur in the local area between the electrodes, in which the insulating material is partially short-circuited, and the remaining parts still have good insulation properties, and the voltage between the electrodes can still maintain a certain value. The former is called destructive discharge, and the latter is called partial discharge.
Destructive discharges and partial discharges can occur in solids, liquids, gas dielectrics, and combinations thereof. In other words, the term discharge can be applied to all dielectrics and combinations thereof.
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