Breakdown characteristics of CF3I/N2/CO2 mixture in power frequency and lightning impulse voltages

Qiming LIN (林启明); Su ZHAO (赵谡); Dengming XIAO (肖登明); Baijie ZHOU (周柏杰)

doi:10.1088/2058-6272/aade83

Plasma Science and Technology > 2019 > 21(1): 15401-015401. > DOI: 10.1088/2058-6272/aade83

Qiming LIN (林启明), Su ZHAO (赵谡), Dengming XIAO (肖登明), Baijie ZHOU (周柏杰). Breakdown characteristics of CF₃I/N₂/CO₂ mixture in power frequency and lightning impulse voltages[J]. Plasma Science and Technology, 2019, 21(1): 15401-015401. DOI: 10.1088/2058-6272/aade83

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Breakdown characteristics of CF₃I/N₂/CO₂ mixture in power frequency and lightning impulse voltages

¹ Department of Electrical Engineering, Shanghai Jiao Tong University, Shanghai 200030, People’s Republic of China
² Department of Intelligent Electrical Equipment, Nari Group Corporation, Nanjing 210093, People’s Republic of China

Funds: This work was financially supported by grants from National Natural Science Foundation of China (No. 51337006) and the Science and Technology Project of SGCC ‘Research on SF 6 Alternative Gas for Insulation and Arc Quenching Application’.

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Received Date: May 10, 2018

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Abstract

Abstract

Trifluoroiodomethane (CF₃I) and its mixtures are believed to be prospective alternatives to sulfur hexafluoride (SF₆), which has been included as a greenhouse gas. In this paper, the breakdown properties of a CF₃I/N₂ /CO₂ mixture with the volume fraction of CF₃I fixed at 10% are investigated under power frequency and lightning impulse voltages. The experimental result shows that N₂ possesses higher power frequency and negative lightning impulse breakdown voltages than CO₂, but the power frequency and more negative lightning impulse breakdown voltages of the CF₃I/N₂ /CO₂ mixture do not increase with the content of N₂. For the purpose of explaining this abnormal phenomenon, the ionization energies and excitation energies of CF₃I, N ₂ and CO₂are calculated. The computation results indicate that the ionization energy of CF₃I is lower than the first excitation energy of N₂, but higher than the lowest excitation energy of CO₂, which means that CF₃I molecules are easily ionized by metastable N₂ molecules. The first excitation energy of N₂ is too high, which hinders its application as the buffer gas of CF₃I.
- gas discharge,
- CF₃I gas mixtures,
- Penning effect,
- buffer gas

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References (35)

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