Multi-temperature thermophysical properties and quenching characteristics of arc plasmas in SF6 and its alternative

Authors

  • G. Wang State Key Laboratory of Electrical Insulation and Power Equipment, Xi’an Jiaotong University, Xi’an, Shaanxi Province, People’s Republic of China
  • B. Zhang State Key Laboratory of Electrical Insulation and Power Equipment, Xi’an Jiaotong University, Xi’an, Shaanxi Province, People’s Republic of China
  • J. Deng State Key Laboratory of Electrical Insulation and Power Equipment, Xi’an Jiaotong University, Xi’an, Shaanxi Province, People’s Republic of China
  • M. Cao State Key Laboratory of Electrical Insulation and Power Equipment, Xi’an Jiaotong University, Xi’an, Shaanxi Province, People’s Republic of China
  • X. Li State Key Laboratory of Electrical Insulation and Power Equipment, Xi’an Jiaotong University, Xi’an, Shaanxi Province, People’s Republic of China

DOI:

https://doi.org/10.14311/ppt.2025.2.164

Keywords:

SF6, C4F7N, arc, non-equilibrium plasma, thermophysical properties, MHD

Abstract

Gaseous switching arc plasmas near current zero typically deviate from LTE and are often modeled using a two-temperature approach. However, in non-equilibrium plasmas, different energy states may follow separate Boltzmann distributions, each with distinct temperatures. This study calculates the thermophysical properties of SF6 and C4F7N arc plasmas by explicitly considering translational, rotational, vibrational, and electronic excitation temperatures. The results reveal that compared to the conventional two-temperature model (distinguishing heavy species and electrons), the multi-temperature framework leads to measurable changes in plasma properties. The C4F7N mixture is more sensitive to multi-temperature effects than SF6. Additionally, the two-temperature simulation model may slightly underestimate the plasma’s non-equilibrium degree. 

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Published

2025-09-10

Issue

Vol. 12 No. 2 (2025)

Section

Articles

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Copyright (c) 2025 G. Wang, B. Zhang, J. Deng, M. Cao, X. Li

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