重复频率纳秒脉冲聚四氟乙烯薄膜击穿特性
Breakdown characteristics of repetitive nanosecond-pulse in polytetrafluoroethylene films
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摘要: 实验研究了聚四氟乙烯薄膜在重复频率纳秒脉冲下的击穿特性，选用脉冲上升时间约15 ns，脉宽30~40 ns，重复频率1~1 000 Hz。测量并计算了击穿前后的电压电流波形、重复频率耐受时间和施加脉冲个数与击穿特性密切相关的参数。结果表明,重复频率纳秒脉冲下聚四氟乙烯薄膜击穿场强为MV/cm量级，重复频率耐受时间随施加场强和重复频率的增大而减小。薄膜本身性质及油浸时间使实验数据具有分散性，重复频率纳秒脉冲下聚四氟乙烯薄膜击穿应考虑重复频率条件下的热积累效应和材料缺陷。Abstract: 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
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