The Influence of Short-Width SiC Pulses on the Partial Discharge Inception Voltage of Turn-Turn Insulation

Abstract

Short-width voltage waveforms, here as short as one microsecond, are good approximation of the turn-turn electrical stresses in machine fed by converters with very short rise times. This study shows that partial discharge inception voltage of turn-turn models under such circumstances is higher than the one for longer pulses, possibly challenging the idea that the extremely short rise times are always correspondent to worse inception conditions for the insulation.