Polarity Effect on Standard Lightning Impulse in LN2/Insulation Barrier Composite Systems
Polarity Effect on Standard Lightning Impulse in LN2/Insulation Barrier Composite Systems
复制标题
液氮/绝缘屏障复合系统中标准雷电脉冲的极性效应
DOI：
10.1109/tasc.2021.3099764
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发表时间：
2021-11
影响因子：
1.8
通讯作者：
Xiaoze Pei
中科院分区：
文献类型：
--
作者：
Lei Gao;Bin Xiang;Jiahui Zhang;Youping Tu;Hongxu Li;Zhiyuan Liu;Yingsan Geng;Jianhua Wang;Xiaoze Pei
冲击击穿电压是设计阻容式超导限流器的重要指标之一。然而，在液氮/绝缘屏障复合系统中，关于极性对标准雷电冲击波影响的研究还未见报道。研究了液氮/绝缘屏障复合体系中标准雷电冲击波的极性效应。50%脉冲击穿电压是用一对针对板电极测量的，该针对板电极具有0.05mm厚的PTFE膜。两个电极的差距长度为10 mm。改变针电极和绝缘阻挡层之间的距离。通过示波器记录击穿过程中的时间延迟。击穿路径由PTFE膜上的电弧痕迹确定。结果表明，随着绝缘层距离针状电极的增加，液氮/绝缘层复合材料的50%冲击击穿电压逐渐增大。时间延迟的结果反映了在负极性下，所有的击穿都发生在波形的尾部。在正极性下，大多数击穿发生在波形的头部。随着势垒距离绝缘势垒越近，两种极性下的时延Tdelay越长。正极性时，波尾击穿的几率增大。PTFE上的电弧痕迹表明，所有的击穿都是通过PTFE膜发生的。
Impulse breakdown voltage is one of the most important factors for the designation of the R-SFCLs. However, no research about the polarity effect on standard lightning impulse in LN2/insulation barrier composite systems has been reported. The objective of this paper is to study the polarity effect on the standard lightning impulse in the LN2/insulation barrier composite systems. The 50% impulse breakdown voltage was measured with a pair of the needle to plane electrodes with the 0.05 mm thick PTFE film. The gap length of the two electrodes was 10 mm. The distance between the needle electrode and the insulation barrier was varied. The time delays during the breakdown progress were recorded by the oscilloscope. The breakdown path was determined by the arc traces on the PTFE films. The results showed that the 50% impulse breakdown voltage of the LN2/insulation barrier composite increased with the insulation barrier get closer to the needle electrode. The results of the time delays reflect that in negative polarity, all the breakdowns occurred in the tail of the waveform. In positive polarity, most of the breakdowns occurred in the head of the waveform. With the barrier get closer to the insulation barrier, the longer time delay Tdelay was in both polarities. And the probability of wave tail breakdown increased in positive polarities. The arc traces on the PTFE showed that all the breakdowns were occurred through the PTFE film.