直流GIL中球状自由导电微粒的运动及陷阱抑制  

Motion and Trap Suppression of Spherical Free Conducting Particles in DC GIL

作　　者：汪佛池[1] 杨磊[1] 曹东亮 汪鑫 程祥瑞 WANG Fochi;YANG Lei;CAO Dongliang;WANG Xin;CHENG Xiangrui(Hebei Provincial Key Laboratory of Power Transmission Equipment Security Defense,North China Electric Power University,Baoding 071003,China;State Grid Shenyang Electric Power Supply Company,Shenyang 110811,China;School of Electrical and New Energy,China Three Gorges University,Yiehang 443002,China)

机构地区：[1]华北电力大学河北省输变电设备安全防御重点实验室,保定071003 [2]国网沈阳市供电公司,沈阳110811 [3]三峡大学电气与新能源学院,宜昌443002

出　　处：《高电压技术》2018年第10期3141-3149,共9页High Voltage Engineering

基　　金：中央高校基本科研业务费专项资金(2018MS086)~~

摘　　要：自由导电微粒运动是引发气体绝缘金属封闭线路（GIL）设备故障的主要原因之一,研究GIL中自由导电微粒运动及其抑制对于确保GIL设备安全可靠运行具有重要意义。分析了GIL中盆式绝缘子附近电场分布特性及其球状自由导电微粒的运动和陷阱抑制规律,结果表明：GIL中盆式绝缘子近外壳处场强与楔形电场分布既相似又存在一定差异,导致微粒运动将与楔形电极既相似又存在差异,即GIL中尺寸较大的微粒起跳后会沿盆式绝缘子表面减幅爬升,最终附着于其表面或与导杆碰撞进行谐振运动;GIL外壳构造微粒陷阱将引发其周围电场畸变,导致自由微粒起跳位置先于无陷阱时,陷阱的宽深对附近电场均有所影响,但宽度较之深度对其周围电场的影响更大;基于以上规律,分析探讨了微粒陷阱的构建方法,提出了临界陷阱和捕获值概念进行有效陷阱范围的划分。Movement of free conductive particles is one of the main causes of failure of gas insulated transmission line（GIL）. So it is of great significance for ensuring the safe and reliable operation of GIL equipment to study the movement and suppression of free-conducting microparticles in GIL. We analyzed the distribution of electric field near pot-insulators in GIL and the law of trapping and movement of spherical free conductive particles. The results show that the electric field near the pot-insulator and the outer shell in the GIL is similar to the wedge-shaped electric field distribution. And also, there are some differences. Therefore, apart from the similarity, the particle motion in GIL will have some differences from the wedge electrode. That is, the larger particles will climb along the surface of the pot-insulator and attach to the surface or collide with the guide rod eventually. Constructing a trap on the GIL shell will distort the electric field around, causing the free particle to take off position prior to the absence of a trap. Meanwhile, the width and depth of the trap will affect the nearby electric field. Compared with the depth change, the electric field near the trap increases more significantly when the trap width increases. Based on the analysis, the construction rule of the trap is discussed, and the concept of the critical trap and capture value is proposed to divide the effective trap range.

关 键 词：气体绝缘金属封闭线路 自由导电微粒 电场分析 微粒陷阱 场强畸变 捕获值 

分 类 号：TM72[电气工程—电力系统及自动化]