An Approximate Calculation Method of Broadband Impedance of GIS Pipe Brackets

2019 2nd International Conference on Advanced Materials, Intelligent Manufacturing and Automation

Qian, Wenxiao^1 ; Ji, Jianfei^2 ; Liu, Haibo^1 ; Zhang, Ping^1 ; Xu, Keqiang^3 ; Cao, Shuyun^4 ; Jiao, Chongqing^4

Power Science Research Institute, State Grid Inner Mongolia East Electric Power Co., Hohhot

010090, China^1

Electric Power Research Institute, State Grid Jiangsu Electric Power Company, Nanjing

211103, China^2

Hengjingtong Electronic Technology Co. Ltd, Nanjing

210018, China^3

School of Electrical Engineering, North China Electric Power University, Beijing

102206, China^4

关键词: Approximate calculation methods;    Broadband impedance;    Gas insulated switchgear(GIS);    Grounding systems;    Numerical calculation methods;    Physical structures;    Switching operations;    Transient enclosure voltages (TEV);   

Others  :  https://iopscience.iop.org/article/10.1088/1757-899X/569/5/052102/pdf
DOI  :  10.1088/1757-899X/569/5/052102

来源: IOP

【 摘 要 】

In Gas Insulated Switchgear (GIS) substation, the grounding bracket of GIS pipe is used to support GIS pipe, meanwhile, it's a part of grounding system connecting GIS pipe to grounding grid. The frequency of transient enclosure voltage(TEV) generated during switching operation of disconnector in gas insulated switchgear (GIS) with no-load short busbar can be up to tens or even hundreds of megahertz(MHz). Because of the impact of skin effect and proximity effect, the impedance of bracket will vary considerably with frequency. A simple and effective method of broadband impedance modeling was proposed based on electromagnetic field numerical calculation method and the physical structure of the grounding bracket in this paper. At last, the validity of the method was verified through calculating and analyzing some typical grounding bracket.