Open AccessAn Approximate Calculation Method of Broadband Impedance of GIS Pipe Brackets
Author(s) -
Wenxiao Qian,
Jianfei Ji,
Haibo Liu,
Ping Zhang,
Kun Xu,
Shuyun Cao,
Chongqing Jiao
Publication year - 2019
Publication title -
iop conference series. materials science and engineering
Language(s) - English
Resource type - Journals
eISSN - 1757-899X
pISSN - 1757-8981
DOI - 10.1088/1757-899x/569/5/052102
Subject(s) - switchgear , busbar , disconnector , ground , electrical impedance , bracket , broadband , enclosure , engineering , acoustics , electrical engineering , electronic engineering , structural engineering , circuit breaker , physics , telecommunications
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.