Measurement of Arc Velocity in An Arc-Rotating Pulsed Power Switch Based on B-dot Probes
Guo Rui, He Junjia, Zhao Chun, Chen Lixue, Pan Yuan
Key laboratory of Fusion and Advanced Electromagnetic Technology, Ministry of Education Huazhong University of Science and Technology Wuhan 430074 China
Abstract：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.
郭锐, 何俊佳, 赵纯, 陈立学, 潘垣. 基于B-dot探针的旋弧开关电弧运动速度测量[J]. 电工技术学报, 2010, 25(7): 72-76.
Guo Rui, He Junjia, Zhao Chun, Chen Lixue, Pan Yuan. Measurement of Arc Velocity in An Arc-Rotating Pulsed Power Switch Based on B-dot Probes. Transactions of China Electrotechnical Society, 2010, 25(7): 72-76.
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2010, Vol. 25 
