Breakdown characteristics of gas mixtures in field-distortion gas spark switch under DC voltage
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摘要: 氩气中一般含有大量亚稳态原子，在强外电场作用下容易产生自由电子，能够促进放电通道快速形成。采用场畸变型气体开关，在直流电压下设计了实验平台来探究气体开关中采用SF6-Ar或N2-Ar混合气体后放电时延及抖动的变化情况。改变多种气体状态进行一系列实验，并得出场畸变气体火花开关中SF6-Ar及N2-Ar的击穿特性，根据工程需要对气体种类及混合比例进行最优化设计。实验表明SF6-Ar中Ar质量分数达到20%及以上时，开关放电时延及抖动明显减小。Abstract: In field-distortion gas spark switch, discharge channel between two electrodes can be conducted rapidly in argon gap, as abundant metastable atoms excite in argon. In this paper, a series of experiments to support the superiority of spark gap using argon gas mixtures were accomplished. The discharge characteristics of gas mixtures(SF6-Ar and N2-Ar) in spark gap were obtained under DC voltage. On this basis, we can get the optimized argon percentage of gas mixtures and figure out the breakdown characteristics of gas mixtures in spark gap. The spark gap using SF6-Ar can reach a lower jitter when the percentage of argon is higher than 20%. However there is no ideal performance using N2-Ar mixtures.
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Key words:
- spark gap /
- gas mixtures /
- breakdown delay /
- jitter /
- argon
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