Discharge process and closure jitter of six-stage gas switch under pulsed trigger
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摘要: 实验研究了开关闭合抖动随欠压比和脉冲触发电压的变化关系，利用紫外光纤探测器测量不同间隙放电时延，分析了放电过程对多间隙开关闭合抖动的影响，并研究采用预电离方法降低开关触发电压。实验表明：开关抖动随脉冲触发电压与欠压比的乘积增大呈指数下降趋势；当触发电压和欠压比的乘积大于33 kV时，开关抖动小于5 ns；乘积大于45 kV时，开关抖动降到3 ns以下并趋于饱和；对六间隙气体开关抖动的贡献，触发间隙占30%~40%，其余5个间隙为60%~70%；欠压比和触发电压对触发间隙击穿抖动的影响最大，对随后放电的3个间隙影响较小，对最后2个间隙几乎无影响；当欠压比大于57%时，采用预电离措施使开关的触发电压降低了10 kV以上。Abstract: Closure jitter versus voltage ratio and trigger voltage was experimentally measured for a six-stage gas switch. An ultra-violet fiber system was used to diagnose the discharge process influencing the closure jitter, and a pre-ionizing measure was employed to decrease the trigger voltage. It is found that the switch closure jitter declines exponentially with the product of trigger voltage and voltage ratio. The trigger gap accounts for 30%-40% of the closure jitter while the other five gaps account for 60%-70%. The trigger voltage and voltage ratio have more influences on the jitter of the trigger gap which breaks down first, than on that of the three gaps discharging subsequently, and hardly affects the last two gaps. For the switch with a voltage ratio greater than 57%, the pre-ionizing measure finally lowers the trigger voltage by over 10 kV.
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Key words:
- gas switches /
- voltage ratio /
- closure jitter /
- trigger voltage /
- fiber detector
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