The Surface Discharge Characteristics of Interface between the Silicone Gel and Polyimide under Positive Repetitive Square Voltage

In this paper, discharge pulses generated by surface discharge between the silicone gel and polyimide is studied under positive repetitive square voltage. The polarities of the discharge current pulses at the rising edge and falling edge are opposite, which are defined as the forward and backward discharge current pulses respectively in this paper. The peak values of discharge current pulses are extracted from the measured waveforms, the statistical results of discharge current pulses, discharge instantaneous voltage are analyzed in detail. The results show that the average instantaneous voltage of the forward discharge pulses occurring at the rising edge is higher than that of back discharge at the falling edge. Besides, the peak values of the discharge pulse increase with time at the beginning of the rising edge and the falling edge. As time goes by, the change of electric field generated by the surface charges will lead to an increase in dispersion of the peak values of discharge pulse. Finally, the discharge characteristics of surface characteristics are interpreted qualitatively.