电阻性直流负载条件下银触点的材料传递特性

M. Hasegawa, K. Niizuma, H. Mizukoshi, S. Fujii, K. Sawa
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引用次数: 5

摘要

机电式继电器和机械开关电极之间的电弧放电通常会通过材料转移和电弧侵蚀造成接触面损坏。特别是,即使负载电流非常小,例如DC50至100ma,也会发生材料转移,这比每种触点材料的最小弧电流值要小得多。本文利用扫描激光显微镜研究了不同电阻负载条件下电信继电器银触点的材料转移特性。研究了电负载条件(负载电流和电源电压)与材料传递引起的接触面形态(凹坑和针孔)之间的关系。证实了即使在DC10 V-50 mA的负载条件下,阳极电弧也会发生材料转移,这可能被认为太轻而不会发生电弧放电。测试样本可分为两组;材料转移阶段和电弧侵蚀阶段。从转移阶段到侵蚀阶段的转变被认为是发生的,并且与接触活化过程有关。结果还表明,负载电流对材料转移现象有影响,电源电压与电弧侵蚀现象有关。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Material transfer characteristic of silver contacts under resistive DC load conditions
Arc discharge between electrodes of electromechanical relays and mechanical switches often causes contact surface damage through material transfer and arc erosion. Especially, material transfer sometimes occurs even with a very small load current such as DC50 to 100 mA, which is quite a bit smaller than the minimum arc current value of each contact material. In this paper, material transfer characteristic of silver contacts installed in telecommunication relays were studied with a scanning laser microscope under various resistive load conditions. The relation between electrical load conditions (load current and power supply voltage) and contact surface configuration caused by material transfer (craters and pips) was studied. It is confirmed that material transfer occurs by anode arcs even with the load condition of DC10 V-50 mA, which might be considered too light to have an arc discharge. The tested samples can be categorized into two groups; material transfer phase and arc erosion phase. Transition from transfer phase to erosion phase is believed to occur and is related to the contact activation process. The results also indicate that load current has an influence on the material transfer phenomena and power supply voltage is related to the arc erosion phenomena.
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