CF<sub>3</sub>SO<sub>2</sub>F及其混合气体电弧等离子体粒子组分与物性参数计算

doi:10.19595/j.cnki.1000-6753.tces.231394

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Abstract Sulfur hexafluoride (SF₆) is commonly used as an insulating gas in electrical equipment, but its high global warming potential (GWP) has led to efforts to seek for alternative gases. Reducing SF₆ usage can significantly decrease greenhouse gas emissions, benefitting climate change mitigation and meeting the demand for eco-friendly electrical equipment in renewable energy. Previous research has identified potential environmentally friendly alternatives like C₄F₇N and C₅F₁₀O, but improvements are needed due to factors such as high liquefaction temperature, GWP values, and toxicity. Trifluoromethyl sulfuryl fluoride (CF₃SO₂F) has recently emerged as a highly promising replacement, exhibiting superior performance compared to SF₆ and a much lower GWP of 3 678 (around 15% of SF₆'s GWP). Thus, CF₃SO₂F shows excellent potential as a substitute for SF₆ in insulation applications. Accurate calculations of CF₃SO₂F's particle composition and physical parameters at various temperatures are crucial for further studying its insulating properties and ability to extinguish arcs.
This study delves into the particle composition of CF₃SO₂F gas and its mixture in arc plasma, wherein equilibrium compositions of the plasma within the temperature range from 300 K to 30 000 K were calculated employing the Gibbs free energy minimization method. By virtue of standard statistical thermodynamic equations and the Chapman-Enskog method, the variations of thermodynamic and transport parameters of the plasma versus temperature were computed for different atmospheric pressures and mixture ratios. Subsequently, the influence of different buffer gases on the CF₃SO₂F mixture system was explored, along with a comparison of relevant properties between CF₃SO₂F and other commonly used insulating gases such as SF₆ and C₄F₇N. Finally, the thermal arc breaking capacity of CF₃SO₂F gas was comprehensively analyzed.
The results of particle composition calculations for CF₃SO₂F-N₂ mixtures show that as the temperature increases, larger molecules gradually decompose into smaller molecules and atoms. Above 8 000 K, the occurrence of primary and secondary ionization reactions can be observed for monatomic species, with the order of ionization peaks determined by their respective ionization energies. Furthermore, higher atmospheric pressure has a significant suppressive effect on particle dissociation and ionization reactions. The CF₃SO₂F-N₂ mixture system exhibits four major specific heat peaks at approximately 2 500 K, 7 000 K, 16 000 K, and 30 000 K, which correspond to different primary reactions occurring under these temperatures. Interestingly, the physical properties show significantly distinct for mixed systems with different buffer gases at low temperatures, primarily due to the differences in the number of N₂ and CO₂ atoms. The decomposition process for N₂ occurs in one step at 7 000 K, while CO₂ undergoes a two-step decomposition at 3 000 K and 8 000 K, respectively. Computations of the transport parameters for different insulating gases reveal that the CF₃SO₂F system, which contains carbon (C) element, exhibits higher conductivity than SF₆ between 3 500 K and temperatures below 10 000K. With regards to the thermal arc breaking capacity, 100% SF₆ possesses the strongest ability over CF₃SO₂F and C₄F₇N systems. Finally, the thermal arc interruption capabilities of CF₃SO₂F gas and other common insulating gases were analyzed under actual operating conditions (-25℃, 6 atm). The results indicate that 100% SF₆ exhibits a stronger thermal arc interruption capability. Additionally, the highest thermal arc interruption capability is observed in the 10%CF₃SO₂F-90%CO₂ mixture system, where the ρc_p peak is slightly higher than that of the 5%C₄F₇N-95%CO₂ mixture system below the conductive temperature, while the opposite is true above the conductive temperature.
The following conclusions can be drawn from the simulation analysis: (1) Higher atmospheric pressure effectively suppresses the decomposition and ionization reactions of CF₃SO₂F gas. (2) An increased proportion of CF₃SO₂F in the gas mixture leads to more intense decomposition reactions in the low-temperature region, and milder ionization reactions in the high-temperature region. (3) Compared to the CO₂ pure gas system, N₂ exhibits minimal decomposition processes below the conductive temperature, resulting in distinct differences in the thermodynamic properties and thermal arc interruption characteristics of the corresponding CF₃SO₂F mixture systems. (4) The ρc_p index suggests that CF₃SO₂F possesses a stronger thermal arc breaking capacity than the commonly used insulating gas C₄F₇N.

Key words： CF₃SO₂F environmentally friendly insulating gas plasma particle composition physical parameters

Received: 28 August 2023

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	Ke Xue
	Wang Anyang
	Liu Wei
	Yan Xianglian
	Wang Wen
	Guo Yuzheng
	Wang Jun

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Ke Xue,Wang Anyang,Liu Wei等. Calculation of Particle Composition and Physical Property Parameters of Arc Plasma Particles of CF₃SO₂F and Its Gas Mixtures[J]. Transactions of China Electrotechnical Society, 2024, 39(19): 6145-6161.

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