一种百千伏多级电晕稳定开关  

A 100 kV Multi-Stage Corona-Stabilized Switch

作　　者：王刚 张喜波 刘胜 王俊杰 范红艳 王利民 WANG Gang;ZHANG Xi-bo;LIU Sheng;WANG Jun-jie;FAN Hong-yan;WANG Li-min(Northwest Institute of Nuclear Technology,Xi’an 710024,China;Science and Technology on High Power Microwave Laboratory,Xi’an 710024,China)

机构地区：[1]西北核技术研究院,西安710024 [2]高功率微波技术重点实验室,西安710024

出　　处：《现代应用物理》2019年第3期10-15,共6页Modern Applied Physics

基　　金：国家高技术发展计划项目(AA8072009)

摘　　要：利用电晕开关稳定性好、多级开关耐压高和绝缘恢复能力强等特点,设计了一种同轴多级自击穿电晕稳定开关。该开关的相邻两电极间隙距离相等,电极形状均为刀板结构,可以确保获得较高的电场增强效果;采用SF6作为开关气体,可以形成稳定的电晕效果;采用铜钨合金作为电极材料,可以提高开关寿命。利用CST(computer simulation technology)静电场仿真软件优化得到的开关总级数为7级,两电极的间隙距离为0.7 mm,场增强因子约为4.5。基于Tesla变压器的重频微秒脉冲实验平台,研究了7级电晕稳定开关的击穿特性。实验结果表明,当开关稳定工作的气体压强为0.2 MPa,脉冲有效作用时间小于1μs时,开关击穿电压约为120 kV,重复频率可达50 Hz,时间抖动小于8 ns,电压幅值分散性小于1%。A coaxial seven-stage knife-plane structure corona-stabilized switch is developed with tungsten-copper alloy electrode and SF6 insulated gas.The electrical field amplification coefficient is 4.5 by simulating electrostatic field at single gap length of 0.7 mm.Based on Tesla transformer and Blumlein pulse forming line(PFL),the breakdown characteristics of the seven-stage corona stabilized switch are studied.The experimental results show that when the gas pressure is 0.2 MPa,the pusle time is less than 1μs,the breakdown voltage of the switch is about 120 kV,the repetition frequency can reach 50 Hz,the time jitter is less than 8 ns,and the voltage amplitude dispersion is less than 1%.

关 键 词：电晕稳定 多级开关 重复频率 低抖动 TESLA变压器 

分 类 号：TN78[电子电信—电路与系统]