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Reliability improvement of gas discharge tube by suppressing the formation of short-circuit pathways

Plasma Science and Technology 2022年第3期24卷 138-151页

作者： Lingyun CHENG Nianwen XIANG Kejie LI Weijiang CHEN Kai BIAN Jin YANG Zongqi XU Congying HAN Hongyang GU Chun YANG Heifei University of Technology Hefei 230009People's Republic of China Institute of Energy Hefei Comprehensive National Science CenterHefei 230031People's Republic of China State Grid Corporation of China Beijing 100031People's Republic of China Beijing National Railway Research&Design Institute of Signal&Communication Group Co. Ltd.Beijing 100070People's Republic of China

After cumulative discharge of gas discharge tube(GDT),it is easy to form a short circuit pathway between the two electrodes,which increases the failure risk and causes severe influences on the protected *** reduce the failure risk of GDT and improve cumulative discharge times before failure,this work aims to suppress the formation of two short-circuit pathways by optimizing the tube wall structure,the electrode materials and the electrode structure.A total of five improved GDT samples are designed by focusing on the insulation resistance change that occurs after the improvement;then,by combining these designs with the microscopic morphology changes inside the cavity and the differences in deposition composition,the reasons for the differences in the GDT failure risk are also *** experimental results show that compared with GDT of traditional structure and material,the method of adding grooves at both ends of the tube wall can effectively block the deposition pathway of the tube wall,and the cumulative discharge time before device failure is increased by 149%.On this basis,when the iron-nickel electrode is replaced with a tungsten-copper electrode,the difference in the electrode’s surface splash characteristics further extends the discharge time before failure by 183%.In addition,when compared with the traditional electrode structure,the method of adding an annular structure at the electrode edge to block the splashing pathway for the particles on the electrode surface shows no positive effect,and the cumulative discharge time before the failure of the two structures is reduced by 22.8%and 49.7%,*** these improved structures,the samples with grooves at both ends of the tube wall and tungsten-copper as their electrode material have the lowest failure risk.

关键词： gas discharge tube short-circuit failure tube wall groove tungsten-copper electrode failure risk

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