DC pre-breakdown phenomena and breakdown characteristics in the presence of conducting particles in liquid nitrogen
DC pre-breakdown phenomena and breakdown characteristics in the presence of conducting particles in liquid nitrogen
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DOI：
10.1109/94.983880
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发表时间：
2002-08
影响因子：
3.1
通讯作者：
M. Hara;J. Suehiro;H. Maeda;H. Nakashima
中科院分区：
文献类型：
--
作者：
M. Hara;J. Suehiro;H. Maeda;H. Nakashima
对液氮中自由导电粒子存在时的直流预击穿现象和击穿特性进行了实验研究。结果表明，微放电发生在带电粒子接近带相反电荷的电极时。强烈的微放电可以触发差距的完全击穿。在液氮中，具有mm尺寸的自由金属颗粒的均匀场间隙的击穿电压可能会降低到远低于没有颗粒的点-面间隙的击穿电压。金属粉末的严重污染会使水平间隔表面的击穿电压大幅降低。然而，与金属粉末相比，碳粉的危险性较小。
DC pre-breakdown phenomena and breakdown characteristics in the presence of free conducting particles in liquid nitrogen are studied experimentally. The results show that a microdischarge occurs when a charged particle is approaching an oppositely charged electrode. An intense microdischarge can trigger a complete breakdown of the gap. The breakdown voltage of a uniform field gap with a free metallic particle of mm size might be reduced well below that of a point-to-plane gap without a particle in liquid nitrogen. Heavy contamination by a metallic powder produces a large reduction in the breakdown voltage with a horizontal spacer surface. However carbon powder is less hazardous compared to metallic powder.