Effect of Contact Materials of Ag/SnO2 and Ag/ZnO on Rotational Motion of Break Arcs Driven by Radial Magnetic Field
Effect of Contact Materials of Ag/SnO2 and Ag/ZnO on Rotational Motion of Break Arcs Driven by Radial Magnetic Field
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DOI：
10.1587/transele.e93.c.1387
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发表时间：
2010-09
期刊：
影响因子：
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通讯作者：
J. Sekikawa;T. Kubono
中科院分区：
文献类型：
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作者：
J. Sekikawa;T. Kubono
断弧是在直流42v电阻电路的电触点之间产生的。触点材料为Ag/ sno2和Ag/ZnO。触点闭合时的电路电流从5 A到21 A不等。驱动断弧的径向磁场在与阴极内嵌的永磁体的接触间隙之间形成。电弧运动是用高速摄像机观察到的。比较了带磁体和不带磁体的实验结果。结果如下所示。Ag/ sno2和Ag/ZnO触点对的实验结果与纯银触点相似。验证了断弧的旋转运动和缩短弧时长的效果。在断口操作后的接触面上观察到环形、宽而均匀的痕迹。结果表明，该方法能有效地防止电触点的局部侵蚀，减少触点的总侵蚀量。旋转频率f随着电弧电流I弧的增大而增大。Ag/ sno2和Ag/ZnO接触对的结果与我们之前的实验中纯银接触对的结果相似。Ag/ sno2和Ag/ZnO触点的断弧旋转频率低于纯银触点。
Break arcs are generated between electrical contacts in a DC 42 V resistive circuit. Contact materials are Ag/SnO 2 and Ag/ZnO. Circuit current when contacts are closed is varied from 5 A to 21 A. The radial magnetic field to drive break arcs is formed between the contact gap with a permanent magnet embedded in the cathode. The arc motion is observed with a high-speed camera. Experimental results with the magnet are compared with those without the magnet. Following results are shown. Similar experimental results to pure silver contacts are obtained for Ag/SnO 2 and Ag/ZnO contact pairs. The rotational motion of the break arcs and the shortening effect of the arc duration are confirmed. The ring-shaped, wide and uniform traces are observed on the contact surfaces after break operations. This result shows the prevention effect of local erosion of electrical contacts and the reduction of total amount of contact erosion. The rotational frequency f is increased with the increase of the arc current I arc . These results for Ag/SnO 2 and Ag/ZnO contact pairs are similar to the results for pure silver contacts in our previous experiments. The rotational frequency of the break arc for the Ag/Sn0 2 and Ag/ZnO contacts is lower than that for the pure silver contacts.