纳秒脉冲下微堆层绝缘子的真空沿面闪络特性

Surface flashover characteristics of micro-stacked insulators in vacuum under nanosecond pulse

为满足脉冲功率系统高性能、小型化的应用需求,设计并制作了聚酰亚胺膜为介质层、黄铜为金属层及聚全氟乙丙烯膜为介质层、不锈钢膜为金属层2种方案的微堆层绝缘子。基于Marx发生器及单同轴脉冲形成线的纳秒脉冲真空实验平台,对微堆层绝缘子的真空沿面闪络性能进行了测试。为了精确标定测量系统,利用输出脉冲幅值约20 kV的磁脉冲压缩电源对测量系统进行了标定,得到的分压比为25 133∶1。对2种方案微堆层试样的测试结果表明,闪络发生在电压上升期间,最大真空沿面闪络场强接近180 kV/cm。

In order to satisfy application demand for high performance and miniaturization of pulsed power system, two types of micro-stacked insulators were designed and fabricated. One was fabricated from interleaved layers of brass and PI （poly imide）, the other was fabricated from stainless steel and FEP （fluorinated ethylene propylene）. Based on the nanosecond （10 ns/ 30 ns） pulsed power vacuum experimental facility with Marx generator and single coaxial pulse-forming line, the vacuum surface flashover characteristics of the micro stacked insulators were tested. To get a precise calibration of the measurement system, a magnetic pulse compression power supply with a relatively high pulse amplitude output of about 20 kV was used, and a voltage-dividing ratio of 25 133 ： 1 was acquired. Two types of micro-stacked insulator samples were tested respectively. The results show that flashover takes place in the rising period of voltage, and the maximal vacuum flashover field intensity of six samples is close to 180 kV/cm.