A mechanism transition between two consecutive breakdowns at short rod-plane vacuum gap

2016 27th International Symposium on Discharges and Electrical Insulation in Vacuum (ISDEIV) Pub Date : 2016-09-01 DOI:10.1109/DEIV.2016.7748673

Shimin Li, Xinjian Huang, Yingsan Geng, Zhiyuan Liu, Jianhua Wang

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引用次数: 1

Abstract

The objective of this paper is to propose a mechanism transition between two consecutive breakdowns at short rod-plane vacuum gap. A rod-plane vacuum gap is designed in a vacuum interrupter. A 50Hz power frequency voltage is applied across the vacuum interrupter to measure the pre-breakdown field emission current. A compensation algorithm removes the displacement current from the measured current and then only field emission current left. The voltage and field emission current fit the Fowler-Nordheim theory and two parameters β value and effective emission area can be obtained. Three vacuum interrupters are applied the power frequency voltage twice and two consecutive breakdowns happen. The experimental results show that: The first breakdown (BD) voltages of the three vacuum interrupters are 49.5 kV, 44.7 kV, 41.1kV (peak value), and the β value are 260,219, 257 respectively. The second breakdown (BD) voltages of the three vacuum interrupters are 51.5 kV, 48.3 kV, 44.1kV (peak value) but pre-breakdown currents β values and effective emission area are too low to be determined. Thus a mechanism transition between the two consecutive breakdowns in a short rod-plane vacuum gap are suggested as follows: field emission current induced breakdown and particle induced breakdown both exist at 1mm vacuum gap. The first breakdown is induced by field emission current and the second breakdown is induced by particles.

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在短杆面真空间隙处连续两次击穿之间的机构过渡

本文的目的是提出在短杆面真空间隙连续两次击穿之间的机制转变。在真空灭流器中设计了一种棒面真空间隙。在真空灭流器上施加50Hz工频电压，测量击穿前场发射电流。补偿算法从测量电流中去除位移电流，然后只留下场发射电流。电压和场发射电流符合Fowler-Nordheim理论，可以得到两个参数β值和有效发射面积。三个真空灭流器工频电压加两次，连续发生两次击穿。实验结果表明:三种真空灭弧装置的首次击穿电压分别为49.5 kV、44.7 kV、41.1kV(峰值)，β值分别为260,219、257。三种真空灭弧器的二次击穿(BD)电压分别为51.5 kV、48.3 kV、44.1kV(峰值)，但击穿前电流β值和有效发射面积均过低，无法测定。因此，在短棒面真空间隙中，两次连续击穿的机制转变为:在1mm真空间隙中，场发射电流诱导击穿和粒子诱导击穿都存在。第一次击穿由场发射电流诱导，第二次击穿由粒子诱导。

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2016 27th International Symposium on Discharges and Electrical Insulation in Vacuum (ISDEIV)

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