Analysis of Conducted Disturbance via Current Transformer Due to Switch Operation of GIS Disconnector in UHV Substation  

作　　者：Jun Zhao Weijiang Chen Kejie Li Zihan Teng Ni Li Tao Wen Xing Fan 

机构地区：[1]State Key Laboratory of Power Grid Environmental Protection,China Electric Power Research Institute,Wuhan&Beijing,China [2]State Grid Corporation of China,Beijing,China [3]School of Electrical Engineering and Automation,Hefei University of Technology,Hefei,China [4]School of Electrical Engineering,Xi’an Jiaotong University,Xi’an,China

出　　处：《CSEE Journal of Power and Energy Systems》2023年第3期1227-1234,共8页中国电机工程学会电力与能源系统学报（英文）

基　　金：supported by the National Natural Science Foundation of China(51977199).

摘　　要：The characteristics of conducted disturbances via current transformer(CT)caused by switch operations in 1000 kV UHV substations are studied in this paper.Since the broadband circuit models might have limitations on the stability and accuracy for CT conducted disturbance simulation,a frequencydomain simulation method without circuit synthesis is proposed based on VFTC spectrum and CT transfer characteristics.To improve VFTC simulation accuracy,both the bushing radiation loss and frequency-dependent earth impedance are taken into consideration.Transfer characteristics of three types of windings for the 1000 kV GIS CT are ingeniously measured from a combination of fast and slow impulse tests.Through conducted disturbances simulations in UHV Wuhu substation,bushing radiation loss is found to have a suppression effect on the highfrequency response but the effect of frequency-dependent earth impedance can be ignored.As a result,the maximum amplitude of 84.5 A for the conducted disturbance is obtained,thus a fast damped oscillatory wave immunity test with no lower than Level 4 from IEC standard is suggested to test the anti-interference performance of the secondary equipment in UHV substation.

关 键 词：Conducted disturbance current transformer switch operation SIMULATION UHV substation 

分 类 号：TM73[电气工程—电力系统及自动化]