Dispersion characteristics of switching transients from large‐scale experiments in a 1100 kV gas insulated switchgear circuit
作者机构：State Key Laboratory of Power Grid Environmental ProtectionChina Electric Power Research InstituteWuhanChina State Grid Corporation of ChinaBeijingChina School of Electrical Engineering and AutomationHefei University of TechnologyHefeiChina
出 版 物：《High Voltage》 (高电压（英文）)
年 卷 期：2023年第8卷第6期
页 面：1253-1263页
核心收录：
学科分类：0808[工学-电气工程] 080803[工学-高电压与绝缘技术] 08[工学]
基 金：supported by the National Natural Science Foundation of China under Grant No.U20A20305 No.51977199 and No.U1866201
主 题：characteristics transient breakdown
摘 要：The switching operation of gas insulated switchgear(GIS)disconnector will produce multiple random spark discharges between the gas gaps of the *** spark discharge can be affected by various random factors,such as trapped charge on the load side,the initial operating phase,gap distance and operating speed of the disconnector,leading to dispersion *** present,some studies have mentioned this dispersion,but its impact is still unclear due to the lack of experimental data,resulting in a deviation between the simulation results and the measured *** this study,thousands of switching operations were carried out based on the 1100 kV full‐scale GIS circuit in Wuhan ultra‐high voltage alternating current Test *** maximal information coeffi-cient analysis,linear regression fitting and other statistical methods were used to discuss the dispersion characteristics of very fast transient overvoltage(VFTO)and transient enclosure voltage(TEV)from large‐scale experimental *** results show that the dispersion of VFTO and TEV in amplitude aspects both increase gradually as the breakdown voltage increases,with the maximum difference of five times of TEV amplitude at normalised breakdown *** terms of frequency characteristics,the dispersion of different fre-quency components in TEV is always greater than that of VFTO,especially for the high‐frequency ***,by comparing the frequency characteristics of TEV at different positions,we notice that the dispersion is almost independent of the spatial po-sition but only determined by the randomness of spark *** discoveries reveal the importance of the dispersion in switching transients and make up for the lack of theoretical understanding of the correlation among them.
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