设计了一种用于直线变压器驱动源的三电极场畸变气体火花开关。开关采用SF6气体绝缘，开关尺寸和电感较小，实测开关电感约为67 nH。在工作电压±80 kV、工作系数为70%时，开关触发时延为40.0 ns，抖动约2.8 ns。对比研究了钨铜合金和黄铜两种电极材料对开关静态和触发击穿特性的影响，研究结果表明：铜钨合金电极开关的自击穿电压分散性、触发时延及抖动、自放电概率和电极表面烧蚀均小于黄铜电极，更适宜作为三电极场畸变开关的电极材料。

A three-electrode field-distortion gas spark switch used for linear transformer drivers is developed. The switch is insulated with SF6. The size and inductance of the switch is small, and the inductance is experimentally estimated at about 67 nH. When the switch operates at ±80 kV charge voltage and 70% working ratio, the delay and jitter are 40.0 ns and 2.8 ns respectively. The influences of the electrode material on the self-breakdown and trigger characteristics are experimentally studied. The results indicate that the switch of CuW electrode has a smaller deviation of self-breakdown voltage, smaller delay and jitter, lower prefire probability and less electrode erosion than that of copper electrode. Compared with copper material, CuW material may be more suitable for three-electrode field-distortion gas switch.