针对三电极气体火花开关工作时产生的强电磁辐射，首先对开关的导通电流及其电磁辐射进行了理论分析，利用CST电磁仿真软件对气体火花开关开展了静电场仿真研究，分析了开关短程导通时的击穿场强；其次对三电极气体火花开关的导通电流和远场辐射场强进行了实验测量，对实验结果进行分析和总结；最后采用电磁屏蔽方法对开关的强电磁辐射进行了有效抑制。研究结果可以为有关脉冲功率装置的电磁辐射及防护提供参考和借鉴。

Strong electromagnetic radiation is produced when the three-electrode gas spark switch works. In this paper, firstly, theoretical analysis of the on-current and electromagnetic radiation of the switch is carried out, then the switch is simulated by CST software and the breakdown field strength of which is calculated. Secondly, the on-current and far-field radiation field strength of the three-electrode gas spark switch are measured experimentally, and the results are summarized and analyzed. Finally, the strong electromagnetic radiation of the switch is suppressed with electromagnetic shielding method effectively. The research results can provide reference for electromagnetic radiation and protection of pulse power devices.