电弧与AgMeO接触材料相互作用模型

Electrical Contacts - 2007 Proceedings of the 53rd IEEE Holm Conference on Electrical Contacts Pub Date : 1993-09-27 DOI:10.1109/HOLM.1993.489656

Ming Sun, Qiping Wang, M. Lindmayer

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引用次数: 19

摘要

通过高速相机观察和SEM显微照片，对不同直径的圆柱触点进行了切换实验，分析了在1000 A rms电流范围内电弧过程中，相变、粘度和表面张力对AgMeO触点材料侵蚀损失的影响。由于侵蚀由蒸发和微小熔滴损失两种模式组成，因此采用AgMeO的侵蚀模型来表示电弧-电极相互作用过程中的热力函数以及对应于侵蚀上限和下限的液-固、液-气边界。在此基础上，假设弧柱为间隙中间的一个假设“点热源”，采用有限微分法建立了新的侵蚀数学模型，并与实验结果吻合较好。

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The model of interaction between arc and AgMeO contact materials

Based on switching experiments with cylindrical contacts of different diameters by high speed camera observations and SEM micrographs, the effects of phase change, viscosity and surface tension on erosion losses of AgMeO contact materials are analysed during arcing in the current range up to 1000 A rms. The erosion model of AgMeO is used for expressing the heat-force function during arc-electrode interaction and the liquid-solid, liquid-gas boundary corresponding to the upper and lower erosion limit respectively for the reason that erosion is composed of two modes: evaporation and minute molten droplets losses. Furthermore, supposing that the arc column is a hypothetical "point heat source" in middle of the gap, a new erosion mathematical model is established by the finite differential method and the results coincide well with those of experiments.

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

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