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中文摘要：
多次过电压冲击会对信号电涌保护器中的气体放电管（GDT）与瞬态抑制二极管（TVS）能量配合产生影响。针对这一问题分析了气体放电管在冲击电压下表面电荷积聚原因；利用有限元法仿真了气体放电管在不同冲击次数、不同电极粗糙程度下表面电场强度分布；同时对气体放电管进行多次过电压冲击试验，观察启动电压变化趋势并与仿真结果进行对比。仿真和试验结果表明：多次冲击使得电极表面粗糙度增大，影响GDT启动电压，启动电压的变化会导致气体放电管和TVS能量配合失效。研究指出：将GDT和TVS间的退耦电阻由原来的2．2n改变为4Ω能够有效削弱多次冲击的影响，并且在规定的通频带下，仍具有较好的传输特性。
英文摘要：
Repeated overvohage-impulses on two-stage signal Surge Protection Devices （SPD） will influence energy matching between Gas Discharge Tube （GDT） and Transient Voltage Suppressor （TVS）. Aimed at this matching problem, the author analyzes the reason of charges accumulation on the surface of various kinds of GDTs, when these GDTs are impacted by overvohage; by using Finite Element Method （FEM）, different patterns of electric field around the surface of GDTs due to different impacts times and various GDTs surface coarseness are simulated. In the meantime, overvohage impulses were repeatedly carried on these GDTs, and the variation trend of trigger voltage are observed and compared with simula- tion results. Both the simulation and experimental results suggest： repeated impulses can deepen the roughness of GDTs＇ electrode surface and will cause the trigger voltage change. As a result, energy matching between GDT and TVS will lose efficacy. According to this research, if decoupling resistance between GDT and TVS is changed from 2.2 Ω to 4 Ω, influences from repeated impulses can be effectively weakened, and if also within the limits of formulary transmission bands, transmission property will remain preferable.
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