多电极气体放电管与ZnO压敏电阻匹配性能的研究

Research on Matching Performance between Multi-Electrodes Gas Discharge Tube and Zinc Oxide Varistors

针对多电极气体放电管与ZnO压敏电阻匹配使用的问题,根据多级气体放电管及ZnO压敏电阻的工作原理,ZnO压敏电阻并联在多电极气体放电管的两个电极上,能够有效的降低多电极气体放电管在辉光放电时的残压,并且进行相应的分流。利用汤森理论对多电极气体放电管的辉光、弧光放电进行模型等效,并使用开路电压波(1.2/50μs)、8/20μs雷电冲击平台、组合波(1.2/50μs,8/20μs)进行冲击试验,验证了多电极气体放电管模型等效的正确性;同时试验现象中发现了ZnO压敏电阻并联在多电极气体放电管冲击时的阴极端电极上,能够加速多电极气体放电管的放电速度,显著缩短多级间隙动作时延。据此现象及理论分析,提出了利用多电极气体放电管设计开关型电涌保护器并联ZnO压敏电阻的方法,在实际应用中具有一定的参考价值。

Concerning problems of the matching performance between multi-electroues gas discharge tube and Zinc oxide varistors, it can be inferred that when the multi-electrodes gas discharge tube is in parallel with Zinc oxide varistors, according to the operational principle of them, residual voltage of the gas tube can be effectively reduced during the stage of glow discharge and gas tube will be shunted by Zinc oxide varistors. Based on the Townsend theory, the equivalent discharge model of gas tube during the stage of glow and arc discharge is founded. Through impulse test by the open circuit voltage wave （1.2/50μs） ,8/20 μs impulse current wave and combine wave （1.2/50μs,8/20μs）,the accuracy of the model is verified; during the experiment, it is also found when Zinc oxide varistors is in parallel with the negative electrode of gas tube during the impulse, the speed of discharge is significantly boosted and the response time of the multi-gap is markedly shortened. According to the phenomenon and theoretical analysis, it is proposed that a new method of parallel connection between multi-electrodes gas discharge tube and metal oxide varistor, which has a certain reference value in the practical application.