高压大电流SF6激光触发开关中透镜的污染

研究了高压大电流SF6激光触发开关在使用过程中透镜污染的问题,通过对激光触发开关中被污染透镜透过率的测量、透镜表面附着物的分析和透镜使用寿命的数据积累,总结出氟化氢的腐蚀和开关粉尘附着是造成激光开关透镜透过率降低、以致失效的主要原因。通过三种激光触发开关结构参数分析和开关运行数据的比较,认为采用氟化钙透镜、低吸水性绝缘材料、选择轴向绝缘V/N型辅助间隙多电极开关结构、铜钨合金电极、脱水处理等措施,可以降低氟化氢和粉尘的产额,从而增加开关的工作寿命。

Pollution of lens in high pressure SF6 gas for high-voltage,high-current,laser triggered switch

The surface damage of the lens in high voltage, high current laser triggered gas switch is analyzed, based on the measurements of optical transmission, the analysis of the mist material on the lens surface and the statistic of exposure time. Both the corrosion and the debris/dust deposition on the lens surface have some effect on the optical transmission, which leads to the failure. From the comparison of three different structure laser triggered switches and the statistics of their operation data, it is concluded that both HF and debris/dust can be greatly eliminated by using the CaF2 lens, low water imbibitions insulation materials, and tungsten-copper electrode. The operation time of the switch can be prolonged with dehydration processing of the components. The axial insulated V/N type assistant multilevel gap switch has the longest operation life.