基于B-dot探针的旋弧开关电弧运动速度测量  

Measurement of Arc Velocity in An Arc-Rotating Pulsed Power Switch Based on B-dot Probes

作　　者：郭锐[1] 何俊佳[1] 赵纯[1] 陈立学[1] 潘垣[1] 

机构地区：[1]华中科技大学核聚变与电磁新技术教育部重点实验室,武汉430074

出　　处：《电工技术学报》2010年第7期72-76,共5页Transactions of China Electrotechnical Society

基　　金：国家自然科学重点基金资助项目(50437020)

摘　　要：针对一个轴向磁场控制的旋转电弧脉冲功率开关,借助B-dot探针研究了开关中的电弧在常压下空气中的运动特性。B-dot探针是一个基于电磁感应原理的小线圈,其感应电压随电弧距线圈位置而变化。为研究电弧运动速度随电流变化的规律,在一周内均匀布置6个探针。探针被放置在电极间隙的正下方,其轴向与电弧运动方向平行,且在同一高度上。计算电弧速度时,近似认为探针信号过零点对应于电弧经过探针正上方。实验中采用一个多模块放电回路,通过时序放电,在开关上得到近似梯形状的电流波形。根据探针信号计算得到在该电流波形下电弧速度的变化,在电流为20kA时,电弧速度约为550m/s。The B-dot probes are installed in an arc-rotating pulsed power switch to measure the arc velocity in air at atmospheric pressure. B-dot probe is a small sensing coil based on Faraday’s law. Its voltage varies with the distance from the arc to probe. Six probes are set uniformly in a circle to obtain the arc velocity variation with the current. The probes are set under the gap and their axial are parallel to the arc moving direction. The zero-crossing point of probe voltage signal is considered as the time when the arc passing the probe. A power supply system consistes several independent modules discharging in sequence provided a trapezoidal pulse of current on the switch. The arc velocity variation of the current is obtained by calculating the probe signal. The arc rotates at about 550m/s when the current is 20kA.

关 键 词：旋转电弧脉冲功率开关 轴向磁场 B-dot探针 电弧运动速度 

分 类 号：TM564[电气工程—电器]