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首页> 外文会议>International Symposium on Discharges and Electrical Insulation in Vacuum >Influence of axial magnetic field on cathode plasma jets in high-current vacuum arc
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Influence of axial magnetic field on cathode plasma jets in high-current vacuum arc

机译：轴向磁场对大电流真空电弧中阴极等离子体射流的影响

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摘要

In this paper, the experiments of cup-shaped axial magnetic field (AMF) contacts were conducted in which a Helmholtz coil was introduced to generate different external imposed AMF. It was found that the appearance of arc plasma was changed by variation of the external imposed AMF. If the composite AMF in arc column increased gradually, the obvious individual cathode plasma jets were detected, the arc constriction decreased and the arc stability increased. Meanwhile, the inclination of cathode jets was observed and the inclination direction of cathode plasma jets changed by variation of the external imposed AMF and its direction. It was also found that, if the composite AMF in interelectrode gap points to different directions at a certain moment, it may lead to the transfer of arc column from the center to edge of interelectrode region and the arc instability until when the composite AMF in interelectrode gap points to the same direction. It can be concluded that the appearance of individual cathode plasma jets can be manipulated by the variation of AMF, which is helpful to study the interaction between arc plasma and electrodes, especially the anode, and improve the interruption performance at higher current.
机译：在本文中，进行了杯形轴向磁场（AMF）接触的实验，其中引入了亥姆霍兹线圈以产生不同的外部施加的AMF。发现电弧等离子体的外观通过外部施加的AMF的变化而改变。如果电弧塔中的复合AMF逐渐增加，则可检测到明显的单个阴极等离子体射流，电弧收缩减小，电弧稳定性增强。同时，观察到阴极射流的倾斜，并且由于外部施加的AMF及其方向的变化而改变了阴极等离子体射流的倾斜方向。还发现，如果电极间间隙中的复合AMF在某个时刻指向不同的方向，则可能导致电弧柱从电极间区域的中心到边缘的转移以及电弧的不稳定性，直到当电极间复合AMF差距指向相同的方向。可以得出结论，可以通过AMF的变化来控制单个阴极等离子体射流的出现，这有助于研究电弧等离子体与电极（尤其是阳极）之间的相互作用，并改善在更高电流下的中断性能。

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