Partial Discharge in HV & EHV Power Line


 Partial Discharge in High and Extra High Voltage Line?

Partial Discharge (PD) is very much important for Underground Power Cable. If you work with Power Cable, you must know the why and where Partial Discharge are presents. It will help to take action at right place in right time. 



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  1. In electrical engineering, partial discharge (PD) is a localized dielectric breakdown of a small portion of a solid or fluid electrical insulation system under high voltage stress, which does not bridge the space between two conductors.
  2. Partial discharges are small electrical sparks that occur within the insulation of medium and high voltage electrical assets. Each discrete partial discharge is the result of an electrical breakdown of an air pocket within the insulation. These discharges erode insulation and eventually result in insulation failure.

  3. Partial discharge testing results can help predict future performance and reliability of critical assets, including:
    • Cables, splices, and terminations
    • Power transformers and bushings
    • Switchgear
    • Motors and generators






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