电弧对电极的能量输入与侵蚀过程

Arc-electrode Interaction and Erosion Process

电弧对触头表面的能量输入是影响触头侵蚀量的决定因素.为了深入理解电弧-电极的交互作用及电弧侵蚀的物理过程,本文对不同直径及材料的圆柱形触头在1000A电流范围内进行了半波正弦电流的分断试验研究.采用高速摄影技术和扫描电镜(SEM)微观照片分析两种方法测量并分析了弧根直径及弧根电流密度与电流的关系.给出AgSnO_2、AgCdO的侵蚀量与电流及触头直径大小的关系,同时对比了相应的Ag,Cu的试验结果.

The energy input from arc to contact surface is a decisive factor on erosion of contact materials. In order to comprehend the process, switching experiments with cylindrical contact pieces of different diameters were carried out with the current up to 1000A (rms). Arc root diameters and apparent current densities were evaluated by high speed camera and SEM micrographs. Furthermore, results of erosion losses at different currents and contact sizes are presented for contacts of AgCdO. AgSnO2, and, for comparison, Cu and Ag.