Influence of axial self-magnetic field component on arcing behavior of spiral-shaped contacts
Influence of axial self-magnetic field component on arcing behavior of spiral-shaped contacts
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DOI：
10.1063/1.4933003
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发表时间：
2015-10
影响因子：
2.2
通讯作者：
D. Feng;S. Xiu;Yi Wang;Gang Liu;Yali Zhang;Dongli Bi
中科院分区：
文献类型：
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作者：
D. Feng;S. Xiu;Yi Wang;Gang Liu;Yali Zhang;Dongli Bi
真空灭弧室通常采用横向磁场触头设计。当电弧在触头之间发生时，触头结构可以产生自感磁场，驱动电弧在触头上移动和旋转，从而可以避免局部过热和严重侵蚀。然而，双极触头也可能产生轴向自磁分量，并且该分量对电弧行为的影响迄今尚未被考虑。在一个装有高速电荷耦合器件摄像机的可拆卸真空室中，对三种不同结构的五种不同类型的Cu-Cr螺旋形触头进行了研究。结果表明，触头结构对电弧行为有很大影响，特别是在电弧旋转和有效接触面积方面，而具有相同槽结构但不同直径的触头表现出相似的电弧行为和电弧运动。对三种不同触头结构的磁场分布和洛仑兹力进行了数值模拟，并首次将轴向自磁场考虑到触头设计中。结果发现，具有较高的轴向自磁场分量的触头设计往往具有较大直径的弧柱，并且在实验中显示出较差的电弧运动和旋转性能。
The transverse magnetic field (TMF) contact design is commonly used in vacuum interrupters. When arcing occurs between the TMF contacts, the contact structure can create a self-induced magnetic field that drives the arc to move and rotate on the contact, and thus local overheating and severe erosion can be avoided. However, TMF contacts could also create an axial self-magnetic component, and the influence of this component on the arc behavior has not been considered to date. In this paper, five different types of Cu-Cr spiral-shaped TMF contacts with three different structures are investigated in a demountable vacuum chamber that contains a high-speed charge-coupled device video camera. It was found that the contact structure greatly influenced the arc behavior, especially in terms of arc rotation and the effective contact area, while contacts with the same slot structure but different diameters showed similar arc behavior and arc motion. The magnetic field distribution and the Lorentz force of each of the three different contact structures are simulated, and the axial self-magnetic field was first taken into consideration for investigation of the TMF contact design. It was found that contact designs that have higher axial self-magnetic field components tend to have arc columns with larger diameters and show poorer arc motion and rotation performance in the experiments.