摘要
This paper presents the results of numerical investigation of the current pulses characteristics in SF_(6)/CF_(4)mixtures for the negative point-plane corona discharge.The pressure and the temperature of gas mixtures are 0.4 MPa and 300 K,respectively.The CF_(4)content varies from20%to 80%.The 2D axisymmetric geometry with point-plane electrodes is investigated,and the three drift-diffusion equations are solved to predict the characteristics of the negative corona discharge.In addition,Poisson’s equation is coupled with the above three continuity equations to calculate the electric field.In order to calculate the electron impact coefficients,including the Townsend ionization and attachment coefficients,as well as the mobilities and diffusion coefficients for electrons,the two-term Boltzmann equation is solved.The characteristics of three ionic species at five stages of the first current pulse in 60%SF_(6)-40%CF_(4)and20%SF_(6)-80%CF_(4)mixtures are selected to discuss the development mechanism of current pulses.Moreover,the reduced electric field strengths at the corresponding time instants are presented to help understand the discharge process.The current waveform and the total number of three species are compared in all the cases to analyze the effects of the CF_(4)content on the discharge.The reduced electric field strength is also helpful in understanding the effects of CF_(4)content.When the CF_(4)content increases to 80%,the discharge is more intensive and the pulse frequency also increases.
作者
高青青
王小华
Kazimierz ADAMIAK
杨爱军
刘定新
纽春萍
张嘉伟
Qingqing GAO;Xiaohua WANG;Kazimierz ADAMIAK;Aijun YANG;Dingxin LIU;Chunping NIU;Jiawei ZHANG(School of Electrical Engineering,Xi'an University of Technology,Xi'an 710048,People's Republic of China;State Key Laboratory of Electrical Insulation and Power Equipment,Xi'an Jiaotong University,Xi'an 710049,People's Republic of China;Department of Electrical and Computer Engineering,Western University,Ontario N6A5B9,Canada)
基金
Natural Science Foundation of Shaanxi Provincial Department of Education(No.21JK0792)
National Natural Science Foundation of China(No.51521065)
National Key Basic Research Program of China(973 Program)(No.2015CB251001)
the Natural Sciences and Engineering Research Council of Canada(NSERC).
