What Is Partial Discharge?
A partial discharge (PD) is an electrical discharge or spark that bridges a small portion of the insulation between two conducting electrodes. PD can occur at any point in the insulation system, where the electric field strength exceeds the breakdown strength of that portion of the insulating material.
Partial Discharge Emissions
Partial Discharges emit energy as:
- Electromagnetic emissions, in the form of radio waves, light and heat.
- Acoustic emissions, in the audible and ultrasonic ranges.
- Ozone and nitrous oxide gases.