基于X射线短时照射的高压直流GIS/GIL绝缘子表面电荷主动消散方法  

Active Charge Dissipation Method for Surface Charge on the Surface of DC GIS/GIL Insulator Based on Short-Time X-Ray Irradiation

作　　者：汪沨[1] 梁芳蔚 钟理鹏 陈赦[1] 谢亿 Wang Feng;Liang Fangwei;Zhong Lipeng;Chen She;Xie Yi(College of Electrical and Information Engineering Hunan University,Changsha 410082,China;Electric Power Research Institution Hunan Electric Power Company,Changsha 410007,China)

机构地区：[1]湖南大学电气与信息工程学院,长沙410082 [2]湖南省电力有限公司电力科学研究院,长沙410007

出　　处：《电工技术学报》2020年第14期3147-3151,共5页Transactions of China Electrotechnical Society

基　　金：国家自然科学基金资助项目(51677061)。

摘　　要：直流气体绝缘开关装置及气体绝缘输电管道(GIS/GIL)绝缘子长期运行过程中会积聚大量表面电荷,易引起绝缘子异常闪络。近年来国内外学者开展了大量卓有成效的工作,深刻揭示了绝缘子表面电荷的积聚和消散机理,但GIS/GIL不打开罐体条件下,绝缘子表面电荷的快速消散问题一直没有解决。该文首次提出基于X射线短时照射的绝缘子表面电荷主动消散新方法,试验研究发现X射线照射30s即能使空气中绝缘子表面电荷几乎完全消散。对基于X射线照射的绝缘子表面电荷消散机理进行了探讨,认为X射线可能通过促进气体侧电荷沿传导及绝缘子表面电荷脱陷而实现其快速消散。由于X射线能够穿透GIS/GIL金属罐体,相关实验结果为GIS/GIL不打开罐体条件下实现绝缘子表面电荷快速消散提供了可能途径,对进一步推进直流GIS/GIL工程化具有重要意义。DC gas insulated switchgear/gas insulated transmission line(GIS/GIL)insulator will accumulate a large amount of charge on its surface during long-term operation,which can easily cause abnormal surface flashover.In recent years,many researchers have carried out a lot of fruitful work.The mechanisms of charge accumulation and dissipation on insulator surface have been deeply revealed.However,the challenge to efficiently dissipate surface charges in GIS/GIL when keep the tank closed is still unsolved.An active surface charge dissipation method based on short-time X-rays irradiation has been proposed in this paper.It has found by experiment that 30s X-ray irradiation can dissipate nearly all surface charges when the gas medium is air.The dissipation mechanism of surface charges on insulator has been studied.Conduction of charges through gas channel and escape of trapped surface charges can be promoted by X-ray irradiation,so that the dissipation rate will be greatly increased.The results provide a new idea for realizing rapid surface charge dissipation on the surface of insulator in GIS/GIL without opening the tanks,which has great significance for the engineering application of DC GIS/GIL.

关 键 词：直流GIS/GIL 绝缘子 表面电荷 X射线 主动消散 

分 类 号：TM85[电气工程—高电压与绝缘技术]