CAJ | 학술논문

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SF_6/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;SF_6/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.
사기체개관형성다통도방전시감소개관전감、통도전조、전겁용식,제고개관수명화은정성적유효조시.설계료일충동축장기변기체화화개관,연구료개관재납초맥충전압하적다통도방전현상.연구료맥충전압상승속솔여다통도방전특성적관계,비교료량충체적비적SF_6/Ar혼합기체다통도방전특성.실험결과표명:일정기압하,평균통도수수착맥충전압상승솔증가이증다,전류분포추향균균;상동맥충봉치여기압비치,불동기압하,고기압하적통도수교다;SF_6/Ar혼합기체중,아기함량교고정황하다통도방전특성교호.최후,결합J.C.Martin적다통도방전이론대실험결과작출료초보해석.
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 SF_6/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 larger than that under a lower one if their ratios of pulse peak to pressure are equal. The SF_6/Ar mixture containing more Ar shows better multichannel discharge characteristics. In the end, a preliminary explanation for these experimental results is given based on J.C.Martin's theory on multichannel discharge.