Integrated modelling of vacuum flashover development: Above-surface processes and breakdown threshold analyses

作     者：Sun, Guangyu Yao, Yitong Yang, Xiong Guo, Baohong Zhang, Shu Wang, Chao Lian, Ruhui Song, Baipeng Mu, Haibao Zhang, Guanjun 

作者机构：Xi An Jiao Tong Univ Sch Elect Engn State Key Lab Elect Insulat & Power Equipment Xian Shaanxi Peoples R China 

出 版 物：《HIGH VOLTAGE》 (高电压（英文）)

年 卷 期：2024年第9卷第3期

页      面：614-625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：National Natural Science Foundation of China [51827809, 51707148, 12175176] National Natural Science Foundation of China (NSFC) 

主　　题：SECONDARY ELECTRONS INSULATORS EMISSION VOLTAGE FIELD DC 

摘      要：The flashover in vacuum is a rapid interfacial discharge across the insulator surface when subjected to high applied voltage. Here a theoretical model covering above-surface processes is introduced. The model calculates the flashover threshold in vacuum, with revised secondary electron emission avalanche theory and improved desorbed neutral transport model. The model serves as the first part of an integrated flashover model, aiming for consistent treatment of both above-surface and subsurface processes during the entire flashover development. The flashover threshold is obtained by combining the desorbed neutral pressure at given applied voltage and the gas breakdown criterion dictated by the Paschen s law. An analytical formula for threshold estimation containing physical parameters, and a simplified formula consisting of empirical coefficients are introduced, catering for both conceptual understanding and practical application. The derived formulae are validated by experimental data for a variety of insulator materials. The theory generalisation for non-uniform electric field distribution is further discussed.