220 kV共箱式GIL壳体电位升高抑制策略研究  

Study on the Suppression Strategy of Shell Potential Rise in Gas⁃insulated Transmission Lines of 220 kV Three⁃phase Common Box⁃type

作　　者：谌珉灏 张旭 鲁杰 张潮海 陈晓鸣 李松伟 CHEN Minhao;ZHANG Xu;LU Jie;ZHANG Chaohai;CHEN Xiaoming;LI Songwei(Dept.of Electrical Engineering,Nanjing University of Aeronautics and Astronautics,Nanjing 211106,China;Jiangsu Ankura Smart Transmission Engineering Technology Co.,Ltd.,Jiangsu Changzhou 213162,China)

机构地区：[1]南京航空航天大学自动化学院电气工程学院,南京211106 [2]江苏安靠智能输电工程科技股份有限公司,江苏常州213162

出　　处：《高压电器》2024年第12期1-12,共12页High Voltage Apparatus

基　　金：2022年江苏省重点科技成果转化资助项目(BA2022212)。

摘　　要：壳体电位升高是气体绝缘输电线路(GIL)运行的关键问题。当混联输电线路遭受雷击或不对称短路等故障时,三相共箱GIL壳体上将产生显著的感应电势。针对三相共箱GIL壳体电位升高问题,目前缺乏相应的壳体电位升高抑制策略研究。因此文中依托实际工程,建立220 kV三相共箱GIL混联输电线路的等效电路模型,分析不同工况下GIL壳体电位升高的原理及影响因素,从而提出了壳体电位升高抑制策略,并通过电磁暂态仿真进行了验证。研究表明:发生单相接地短路故障时,壳体电位提升最大;当存在雷电侵入波,GIL壳体出现明显的电位升高现象;架设避雷器以及采用两端集中接地的接地方式,可以有效抑制共箱式GIL的电位升高现象。Shell potential rise is a critical issue in the operation of gas insulated transmission lines(GIL).When a hy⁃brid transmission line suffers from lightning strike or asymmetrical short circuit faults,a significant induced potential will be generated on the three⁃phase common box GIL shell.For the three⁃phase common box GIL shell potential rise problem,there is a lack of corresponding shell potential rise inhibition strategy research.Therefore,this paper relies on the actual engineering,the establishment of 220 kV three⁃phase common box GIL hybrid transmission line equiva⁃lent circuit model,analysis of the principle of GIL shell potential rise under different operating conditions and the fac⁃tors affecting the proposed shell potential rise inhibition strategy,and through the electromagnetic transient simula⁃tion for verification.The study shows that:when a single⁃phase grounded short⁃circuit fault occurs,the shell poten⁃tial rise is the largest.When there is a lightning intrusion wave,the GIL shell appears obvious potential rise phenome⁃non.Erection of lightning arrester and the use of both ends of the centralised grounding method can effectively inhibit the phenomenon of the potential rise of the common box⁃type GIL.

关 键 词：三相共箱气体绝缘输电线路 混联输电线路 壳体电位升高 抑制策略 接地优化 

分 类 号：TM75[电气工程—电力系统及自动化]