Confirmation of High PDA and Corona Probe Readings On a Large Hydro Generator

Published May 8th, 2018 IRMC 2018 - Igor Chichkin

Partial Discharge
  • Incomplete electrical discharge between insulation surfaces, or between insulation and a conductor.
  • Corona is a partial discharge from an open conductor to surrounding gas. Corona is type of PD that can be seen. If you can’t see it – it’s not Corona.
  • Full Discharge is an electrical discharge between two conductors (insulation failure).

Partial Discharge activity can eventually cause Full discharge !


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