Online PD Monitor for MV Switchgear
01 June 2021
Partial Discharge (PD) is a localized electrical discharge or spark resulting when ionization partially bridges the insulation between two conducting electrodes. PD may occur at any point in the insulation system, if the electric field strength exceeds the breakdown strength of the insulating
material. Electrical equipment operating at or above 2,400 volts ac is susceptible to partial discharge/corona activity.
Left unchecked, this unwanted electrical activity can lead to total breakdown of the insulation system and catastrophic failure. PD activity can be short lived or occur over an extended period of time before it results in a phase to ground or phase to phase fault.