Breakdown characteristics of repetitive nanosecond-pulse in polytetrafluoroethylene films

An experimental study on repetition nanosecond-pulse breakdown in polytetrafluoroethylene(PTFE) films is presented, the pulse rise-time and pulse-width are 15 ns and 30~40 ns respectively, and the pulse repetition frequency varies from 1 to 1 000 Hz. The parameters affecting breakdown characteristics such as voltage-current waveforms, repetitive pulse stress time and applied pulse number are measured and calculated. The experimental results show that the electric field of repetition nanosecond-pulse breakdown is on the order of MV/cm, and the repetitive pulse stress time decreases with the increasing of the applied electric field and the pulse repetition frequency. The dispersion of the experimental data results from the intrinsic film properties and oil-filling time. In addition, the ther