轴向滞后磁场对真空电弧零电流阶段阴极斑点分布的影响

2012 25th International Symposium on Discharges and Electrical Insulation in Vacuum (ISDEIV) Pub Date : 2012-09-01 DOI:10.1109/DEIV.2012.6412510

Xiaochuan Song, Z. Shi, S. Jia, Lijun Wang, Yingkui Zhang

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引用次数: 2

摘要

实验研究了触点系统中涡流产生的滞后轴向磁场(AMF)对真空电弧零流段不同降电流速率下阴极斑点分布的影响。在可拆卸的真空室中采用杯形AMF触点进行了实验。利用曝光时间为2微秒的高速数码相机，研究了电弧电流频率为50Hz时触发真空电弧在零电流级的CSs分布特性。然后研究了通过注入频率为500Hz或1kHz的逆流来实现电流下降速率更快的CSs分布特性。利用ANSYS计算了不同降电流速率下零电流阶段的滞后磁通密度。研究结果表明，在快零流阶段，由于接触中心的滞后AMF更强，位于接触板中心的CSs比位于接触板外围的CSs更早熄灭。

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The influence of lagged axial magnetic field on the distribution of cathodes spots in current-zero stage of vacuum arc

The influence of lagged axial magnetic field (AMF) due to eddy current induced in contacts system on the distribution of cathode spots (CSs) in current-zero stage of vacuum arc with different current falling rates was investigated experimentally. Experiments were conducted with cup-shaped AMF contacts in a demountable vacuum chamber. The characteristic of CSs distribution of triggered vacuum arc in current-zero stage with arc current frequency of 50Hz was investigated at first with the aid of a high-speed digital camera with an exposure time of 2 microseconds. Then the characteristic of CSs distribution with faster current falling rate, which was realized by injecting a countercurrent with frequency of 500Hz or 1kHz, was investigated. Moreover, the lagged AMF flux density in current-zero stage with different current falling rates was calculated by ANSYS. Research results showed that CSs located in the center of contact plate tended to extinguish earlier than those at periphery of contact plate in fast current-zero stage due to the stronger lagged AMF in contact center.

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来源期刊

2012 25th International Symposium on Discharges and Electrical Insulation in Vacuum (ISDEIV)

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