Calculation and characteristic analysis on synergistic effect of CF3I gas mixtures |
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Affiliation: | 1. Department of Electrical Engineering, Shanghai Jiao Tong University, Shanghai 200030, People's Republic of China;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 |
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Abstract: | CF3I is a potential SF6 alternative 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 ηand 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 CF3I/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. |
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Keywords: | Boltzmann equation CF3I gas mixtures synergistic effect |
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