Partial discharge (PD) is also called pre-discharge. This is a term used in high voltage engineering. In the partial discharge mainly form and properties of insulating material are concerned. Occur in high voltage insulations or along clearances strongly inhomogeneous field gradients, it may happen that the respective material typical dielectric field strength is partially exceeded. In the state of an imperfect electrical breakdown the insulation between the electrodes is bridged only partially by discharges. Partial discharges occur mainly at stress of isolation with AC voltage.

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