基于有限元法的GDT与TVS能量配合仿真研究

发布时间：2018-07-02 09:14

本文选题：气体放电管 + 表面电荷　；参考：《电瓷避雷器》2017年05期

【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2.2Ω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。
[Abstract]:Multiple overvoltage shocks have an effect on the energy coordination of gas discharge tube (GDT) and transient suppression diode (TVs) in the signal surge protector. In order to solve this problem, the reason of charge accumulation on the surface of gas discharge tube under impulse voltage is analyzed, and the surface electric field intensity distribution of gas discharge tube under different impact times and different electrode roughness is simulated by finite element method. At the same time, several overvoltage impulse tests were carried out on the gas discharge tube, and the change trend of the starting voltage was observed and compared with the simulation results. The simulation and test results show that the surface roughness of the electrode increases with multiple shocks, which affects the GDT starting voltage, and the change of the starting voltage will lead to the failure of the gas discharge tube and the energy coordination of TVs. It is pointed out that changing the decoupling resistance between GDT and TVs from 2.2 惟 to 4 惟 can effectively weaken the influence of multiple shocks, and it still has better transmission characteristics under the specified frequency band.
【作者单位】：南京科技职业学院;南京信息工程大学大气物理学院;
【基金】：国家自然科学基金项目(编号:41175003)
【分类号】：TM862

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