The effect of contact opening velocity and the moment of contact opening on the AC erosion of Ag/CdO contacts

Electrical Contacts - 2007 Proceedings of the 53rd IEEE Holm Conference on Electrical Contacts Pub Date : 1993-09-27 DOI:10.1109/HOLM.1993.489664

J. McBride, S. Sharkh

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引用次数: 26

Abstract

This paper presents experimental results on the influence of contact opening velocity and the moment of contact opening with respect to the start of the AC current cycle on arc energy and contact erosion when breaking an AC resistive circuit. The test currents are 5.6 A, 14.7 A and 26.3 A, and the contact material is Ag/CdO (90/10). A computer controlled test system allows the control of the contact velocity profiles with constant velocities up to 0.8 m/s, and also enables the synchronization of the contact opening with a point on the AC current waveform. Contact erosion is evaluated by measuring the mass loss or gain changes of the cathode and anode. The results show that increasing the contact velocity from 0.1 m/s to 0.8 m/s leads to the increase of the arc energy. The material transfer from one electrode to another is shown to depend on the current, the polarity of the moving contact, the moment of the contact opening with respect to the start of the AC current cycle, and the opening velocity of the contacts.

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研究了触点打开速度和触点打开力矩对Ag/CdO触点交流腐蚀的影响

本文介绍了交流电阻电路开断时触点开断速度和触点开断力矩对电弧能量和触点侵蚀影响的实验结果。测试电流为5.6 A、14.7 A和26.3 A，触点材料为Ag/CdO(90/10)。计算机控制的测试系统允许以恒定速度控制接触速度分布，最高可达0.8 m/s，并且还可以与交流电流波形上的一个点同步接触开度。接触侵蚀是通过测量阴极和阳极的质量损失或增益变化来评估的。结果表明:当接触速度由0.1 m/s增加到0.8 m/s时，电弧能量增大;材料从一个电极转移到另一个电极取决于电流、移动触点的极性、触点相对于交流电流周期开始时的打开时刻以及触点的打开速度。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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Electrical Contacts - 2007 Proceedings of the 53rd IEEE Holm Conference on Electrical Contacts

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