不同气压和电极间距对开关绝缘恢复的影响  

Influence of Gas Pressure and Gap Distance on the Recovery Time of Gas Spark Gap Switch

作　　者：殷毅[1] 刘金亮[1] 钟辉煌[1] 高景明[1] 杨建华[1] 罗玲[1] 

机构地区：[1]国防科技大学光电科学与工程学院,长沙410073

出　　处：《高电压技术》2009年第2期304-308,共5页High Voltage Engineering

基　　金：国家自然科学基金(10675168)~~

摘　　要：为缩短脉冲加速器多脉冲运行时脉冲间隔以及提高重频运行时重复频率,利用多脉冲调制器研究了气体开关的重复频率特性以及在相同电极间距、不同气压下(0.5、1、1.5、2MPa)氮气气体开关的绝缘恢复特性。实验表明,随着气体压强的增加,气体的绝缘恢复时间变长,击穿电压恢复>90%的间隔时间,从50ms增加到78ms;开关间距的改变对绝缘恢复时间影响有限,不同间距(7.3,27.4mm)下其击穿电压恢复>90%时间约为50ms。最后针对相关文献给出的结果,对压强、电极间距对绝缘恢复的影响进行了分析讨论。The recovery characteristics of gas spark gap switch applied in a high power water dielectric pulse forming line with different gas pressure and gas gap distance are experimentally studied using a two-pulse method. The recovery times of gas switch breakdown voltage were given. The results show that as the working pressure （such as 0.5 MPa, 1 MPa, 1.5 MPa, 2 MPa） of gas switch increases, the recovery time of gas switch increases from 50ms to 78ms. The influence of gap distance of electrodes on the recovery time was also experimentally studied. At the gap distance of 7.3 mm and 27.4 ram, experimental results show that the influence on the recovery time is not remarkable. The experiments also prove that the repetitive rate of high power accelerator with pulse forming line is mainly restricted by the gas switch repetitive rate, and the recovery percentage of the vacuum diode voltage and gas switch breakdown voltage are consistent. The method for improving the recovery time is introduced such as using the gas switch with the gap distance smaller than mm level, or making the switch worked at the flat part of the U/p curve.

关 键 词：气体火花开关 绝缘恢复 重复频率 加速器 脉冲调制器 多脉冲 

分 类 号：TM564[电气工程—电器]