What is Partial-Discharge Resistance?

Particle discharge (PD) is defined by IEEE as an electrical discharge that only partially bridges the insulation between conductors and that may or may not occur adjacent to a conductor. Partial discharges occur when the local electrical field intensity exceeds the dielectric strength of the dielectric involved, resulting in localized ionization and breakdown. Depending on the intensity, PDs are often accompanied by emissions of light, heat, sound, and radio influence voltage (with a wide frequency range).
When voids are present in solid dielectrics and the electrical field is sufficiently high, air (or other gas) inside the voids ionizes and creates breakdown pulses across the voids. These pulses are referred to as discharges. Most solid-dielectric insulations degrade under the presence of partial discharge and lead to premature failure of the insulation. However, some dielectric materials are relatively insensitive to PD activities. The ability of solid dielectrics to withstand voltage under the presence of partial discharge is called partial-discharge resistance.

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