纳秒脉冲电压下同轴场畸变开关多通道放电特性
Characteristics of multichannel discharge in a coaxial field-distortion switch under nanosecond voltage pulses
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摘要: 使气体开关形成多通道放电是减小开关电感、通道电阻、电极熔蚀，提高开关寿命和稳定性的有效措施。设计了一种同轴场畸变气体火花开关，研究了开关在纳秒脉冲电压下的多通道放电现象。研究了脉冲电压上升速率与多通道放电特性的关系，比较了两种体积比的SF6/Ar混合气体多通道放电特性。实验结果表明：一定气压下，平均通道数随着脉冲电压上升率增加而增多，电流分布趋向均匀；相同脉冲峰值与气压比值,不同气压下，高气压下的通道数较多；SF6//Ar混合气体中，氩气含量较高情况下多通道放电特性较好。最后，结合J.C.Martin的多通道放电理论对实验结果作出了初步解释。
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关键词:
- 多通道放电 /
- 平均通道数 /
- SF6//Ar混合气体 /
- 统计时延 /
- 形成时延
Abstract: Multichannel discharge in gas switches is an effective approach for the reduction of switch inductance, channel resistance and electrode erosion, and the increase of switch lifetime and stability. A coaxial field-distortion gas spark switch was designed and its multichannel discharge phenomena under nanosecond voltage pulses were investigated. The relation between the characteristics of multichannel discharge and the rising rate of pulse voltage was studied. Multichannel discharge characteristics of SF6/Ar mixtures under two mixture ratios were compared. Experimental results show that under a certain pressure the average number of channels increases as the rising rate of pulses increases, and the distribution of current tends to be uniform. The number of channels under a higher pressure is -
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