激光触发真空开关导通电感测量及特性研究  

Measurement and Characteristic Research of Laser Triggered Vacuum Switch On-Inductance

作　　者：欧健 廖敏夫[2] 卢刚[2] 张运良[1] 韩小涛[3] Ou Jian;Liao Minfu;Lu Gang;Zhang Yunliang;Han Xiaotao(School of Hydraulic Engineering Dalian University of Technology,Dalian 116024 China;School of Electrical Engineering Dalian University of Technology,Dalian 116024 China;National High Magnetic Field Center Huazhong University of Science and Technology,Wuhan 430074 China)

机构地区：[1]大连理工大学水利工程学院,大连116024 [2]大连理工大学电气工程学院,大连116024 [3]国家脉冲强磁场科学中心(华中科技大学),武汉430074

出　　处：《电工技术学报》2023年第16期4499-4506,共8页Transactions of China Electrotechnical Society

基　　金：国家自然科学基金(51777025,52177131);武汉强磁场学科交叉基金(WHMFC202130)资助项目。

摘　　要：激光触发真空开关(LTVS)导通时开关本身电感参数及电弧的电感参数是影响开关导通时延、精度以及可靠性的因素。该文提出一种改进的RLC振荡电路测量LTVS导通时电感的方法,消除回路阻抗对测量的影响,并且减少了燃弧过程中电弧状态改变对测量产生的误差。搭建了LTVS导通实验平台,获得了不同工作电压、激光能量下LTVS导通的电感参数。实验结果表明:LTVS导通时,在前2个电流衰减周期内电感保持稳定,然后降低40~100 nH;LTVS的电感参数随着工作电压升高而变大,当工作电压从1.6 kV增加到3.0 kV,LTVS的电感值从240 nH增长到400 nH;改变LTVS的触发激光能量对电感参数影响并不明显。该文的研究工作为设计低电感LTVS和放电过程中等离子体通道变化提供了一定的参考价值。Laser Triggered Vacuum Switch(LTVS)is a pulse power switch.As the core structure of the pulse power system,LTVS has high accuracy,reliability,and short delay,which is promising in pulse power systems.LTVS on-inductance is closely related to LTVS structures and plasma properties.LTVS on-inductance can be reduced by optimizing the switch structure,electrode structure,and trigger condition,thus improving the current rise rate and the working performance.Therefore,it has become an important research direction for reducing and measuring the inductance of LTVS,and finding the development of discharge channels.This paper proposes an improved RLC oscillation circuit to measure LTVS on-inductance.Using proper line impedance and the voltage of LTVS,this method eliminates the influence of circuit impedance on the measurement and reduces the error caused by the arc during the discharge process.The experiment platform of LTVS conduction was built.The current and voltage waveforms were obtained under different operating voltage and laser energy.LTVS on-inductance was calculated based on theoretical analysis and experimental data.Experimental results show that the operating voltage increases from 1.6 kV to 3.0 kV,and LTVS on-inductance increases from 240 nH to 400 nH in the first two cycles.LTVS on-inductance is 40~100 nH in the third cycle,less than in the first two cycles.Additionally,the laser energy has little influence on the arc during the LTVS discharge process.When LTVS is closed,there is a balance between the force from arc shrinkage and particle diffusion during the first two decay cycles.The force of particle diffusion is stronger than arc shrinkage due to insufficient energy input,resulting in a decrease in LTVS on-inductance.With the increased operating voltage,the arc shrinkage caused by self-generated magnetic becomes stronger.Hence,LTVS on-inductance increases.The laser trigger energy can affect the trigger delay time of LTVS,while the operating voltage determines the arc shape.Therefore,the laser energy is not

关 键 词：激光触发真空开关 工作电压 激光能量 电感 

分 类 号：TM835[电气工程—高电压与绝缘技术]