Charge accumulation characteristic on polymer insulator surface under AC voltage in air and C_(4)F_(7)N/CO_(2)mixtures

作     者：Dayu Li Guixin Zhang Tianyu Wang Yicen Hou 

作者机构：Department of Electrical EngineeringTsinghua UniversityBeijingPeople's Republic of China 

出 版 物：《High Voltage》 (高电压（英文）)

年 卷 期：2020年第5卷第2期

页      面：160-165页

核心收录：

学科分类：080801[工学-电机与电器] 0808[工学-电气工程] 08[工学] 0805[工学-材料科学与工程（可授工学、理学学位）] 080502[工学-材料学] 

基　　金：the National Key R&D Program of China(2017YFB0902500) the Science and Technology Project of SGCC(the Key Technology of Environment-friendly Gasinsulated Transmission Line) 

主　　题：surface insulator charge 

摘      要：Charge accumulation has always been a problem for the safe operation of gas insulated switchgear(GIS)/gas insulated transmission line(GIL)both under AC and *** is of great significance to investigate the behaviour of surface charge under high *** this study,the charge distribution characteristics and accumulation mechanism on insulator surface in air and heptafluorobutyronitrile/carbon dioxide(C_(4)F_(7)N/CO_(2))mixtures under AC voltage are studied via the means of surface potential measurement and inversion algorithm,combined with the improved method of controlling the truncated phase of AC *** results show that under the needle–plate electrode structure,charge distribution on the insulator surface presents a three-tier concentric circle structure both in air and C_(4)F_(7)N/CO_(2) gas mixtures,and the charge composition of the innermost circle is closely related to the truncated phase of AC *** the same amplitude of voltage,the range of charge distribution on insulator surface in C_(4)F_(7)N/CO_(2) mixtures is smaller than that in air,with the negative charges *** is suggested that the characteristic of charge distribution in C_(4)F_(7)N/CO_(2) mixtures is related to the larger electron attachment crosssection of C4F7N gas in a wide range of electron energy distribution.