Calculation and characteristic analysis on synergistic effect of CF<sub>3</sub>I gas mixtures

Su ZHAO (赵谡); Yunkun DENG (邓云坤); Yuhao GAO (高于皓); Dengming XIAO (肖登明)

doi:10.1088/2058-6272/aaaadc

Plasma Science and Technology > 2018 > 20(6): 65401-065401. > DOI: 10.1088/2058-6272/aaaadc

Su ZHAO (赵谡), Yunkun DENG (邓云坤), Yuhao GAO (高于皓), Dengming XIAO (肖登明). Calculation and characteristic analysis on synergistic effect of CF₃I gas mixtures[J]. Plasma Science and Technology, 2018, 20(6): 65401-065401. DOI: 10.1088/2058-6272/aaaadc

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Calculation and characteristic analysis on synergistic effect of CF₃I gas mixtures

¹ Department of Electrical Engineering, Shanghai Jiao Tong University, Shanghai 200030, People’s Republic of Chin
² Postdoctoral Workstation on Yunnan Power Grid Corporation, Kunming 650217, People’s Republic of China
³ School of Electrical and Electronic Engineering, Hubei University of Technology, Wuhan 430068, People’s Republic of China

Funds: This work is supported by National Natural Science Founfidation of China (Grant No. 51337006), China Postdoctoral Science Foundation (2016M602728) and the Science and Technology Project of SGCC ‘Research on SF₆ Alternative Gas for Insulation and Arc Quenching Application’.

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Received Date: November 21, 2017

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Abstract

Abstract

CF₃I is a potential SF₆alternative gas. In order to study the insulation properties and synergistic effects of CF₃I/N₂ and CF₃I/CO₂ gas mixtures, two-term approximate Boltzmann equations were used to obtain the ionization coefficient α, attachment coefficient η and the critical equivalent electrical field strength (E/N)_cr. The results show that the (E/N)cr of CF₃I gas at 300 K is 1.2 times that of SF₆ gas, and CF₃I/N₂ and CF₃I/CO₂ gas mixtures both have synergistic effect occurred. The synergistic effect coefficient of CF_3I/CO₂ gas mixture was higher than that of CF₃I/N₂ gas mixture. But the (E/N)_cr of CF₃I/N₂ is higher than that of CF₃I/CO₂ under the same conditions. When the content of CF₃I exceeds 20%, the (E/N)_cr of CF₃I/N₂ and CF₃I/CO₂ gas mixture increase linearly with the increasing of CF₃I gas content. The breakdown voltage of CF₃I/N₂ gas mixture is also higher than that of CF₃I/CO₂ gas mixture in slightly non-uniform electrical field under power frequency voltage, but the synergistic effect coefficients of the two gas mixtures are basically the same.
- Boltzmann equation,
- CF₃I,
- gas mixtures,
- synergistic effect

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Calculation and characteristic analysis on synergistic effect of CF₃I gas mixtures