Numerical Modelling of Positive Surface Discharges in C-C 4 F 8 /CF 3 I/N 2 Gas Mixture under Non-Uniform Field

Binhai Fan, Yong Qian, Yiming Zang, Ze Li and Xiaoli Zhou
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Binhai Fan: Academy for Engineering & Technology, Fudan University, Shanghai 200433, China
Yong Qian: Department of Electrical Engineering, Shanghai Jiao Tong University, Shanghai 200240, China
Yiming Zang: Department of Electrical Engineering, Shanghai Jiao Tong University, Shanghai 200240, China
Ze Li: Department of Electrical Engineering, Shanghai Jiao Tong University, Shanghai 200240, China
Xiaoli Zhou: Department of Light Sources and Illuminating Engineering, School of Information Science and Technology, Fudan University, Shanghai 200433, China

Energies, 2021, vol. 14, issue 24, 1-17

Abstract: As an environmentally friendly gas with good insulation and stable chemical properties, CF 3 I gas mixture is considered as a potential alternative to SF 6 gas to compensate for the shortcomings of SF 6 gas as a greenhouse gas. This article attempts to study the CF 3 I ternary gas mixtures with c-C 4 F 8 and N 2 by considering the process of streamer development in surface discharge. The model of surface discharge in CF 3 I gas mixture under DC voltage was established by COMSOL, and the drift-diffusion equations of particles was solved to show the discharge process, and the changes of electric field and particle concentration, etc. during the development of streamer were obtained, which provides the theoretical basis for the reliable diagnosis of partial discharge. On this basis, the model is compared with models for two other different gases (SF 6 /N 2 , artificial air) in terms of particle characteristics, streamer characteristics and streamer branches characteristics. Finally, it is concluded that under this model, although the insulation characteristics in CF 3 I gas mixture are weaker than those in SF 6 , the difference is not large and both are much better than those in artificial air, so c-C 4 F 8 /CF 3 I can be considered as a potential substitute for SF 6 .

Keywords: environmentally friendly gas; streamer; surface discharge; COMSOL (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2021
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