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

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

机构地区：[1]State Key Laboratory of Electrical Insulation and Power Equipment,Xi'an Jiaotong University,School of Electrical Engineering,Xi'an,Shaanxi,China

出　　处：《High Voltage》2024年第3期614-625,共12页高电压（英文）

基　　金：National Natural Science Foundation of China,Grant/Award Numbers:51827809,51707148,12175176。

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.

关 键 词：FLASH BREAKDOWN VACUUM 

分 类 号：TM216[一般工业技术—材料科学与工程]