Partial Discharge: Often used interchangeably with Corona
- Electrical discharges that occur across voids in high voltage insulation systems
- Voids or separations can occur due to manufacturing process defects, thermal deterioration, mechanical movement during operation, and other factors
- A transient gaseous ionization and carbonization occurs in an insulation system
when the electric stress exceeds a critical value - This ionization in the void produces partial discharges (Paschen’s Law)