Partial discharge inception characteristic and charge behavior for magnet wire under repetitive inverter surge voltage condition

In this paper, we discussed partial discharge (PD) inception characteristics and mechanisms of magnet wires for inverter-fed motor under repetitive surge voltage application. Experimental results revealed the relationship between PD inception voltage (PDIV) and parameters of applied surge voltage waveform. The relationship between PD pulses and repetitive surge voltage pulses was also investigated. PD generation mechanisms were discussed from the view point of charge behavior in the wedge-shaped air gap and on the enamel surface.