CF_(3)SO_(2)F及其混合气体电弧等离子体粒子组分与物性参数计算  

Calculation of Particle Composition and Physical Property Parameters of Arc Plasma Particles of CF_(3)SO_(2)F and Its Gas Mixtures

作　　者：柯学 王安阳 刘伟 颜湘莲 王雯 郭宇铮 王俊[1] Ke Xue;Wang Anyang;Liu Wei;Yan Xianglian;Wang Wen;Guo Yuzheng;Wang Jun(School of Electrical Engineering and Automation,Wuhan University,Wuhan430072,China;Power Science Research Institute,State Grid Anhui Electric Power Co.Ltd,Hefei230022,China;China Electric Power Research Institute,Beijing100192,China)

机构地区：[1]武汉大学电气与自动化学院,武汉430072 [2]国网安徽省电力有限公司电力科学研究院,合肥230022 [3]中国电力科学研究院有限公司,北京100192

出　　处：《电工技术学报》2024年第19期6145-6161,共17页Transactions of China Electrotechnical Society

基　　金：国家重点研发计划资助项目(2021YFB2401400)。

摘　　要：CF_(3)SO_(2)F是一种有望替代SF_(6)的新型环保绝缘气体,计算CF_(3)SO_(2)F及其混合气体在不同温度下的粒子组成和物性参数对进一步研究其绝缘性质和灭弧能力有重要意义。该文首先深入研究CF_(3)SO_(2)F及其混合气体电弧等离子体粒子组分,并基于吉布斯自由能最小化方法计算得到等离子体在300~30000 K温度范围内的平衡组分;其次根据标准统计热力学关系和Chapman-Enskog方法,在不同气体压力和混合比例下,计算得到等离子体各项热力学参数和输运参数随温度的变化规律;然后探讨了不同缓冲气体对CF_(3)SO_(2)F混合体系的影响,并比较了CF_(3)SO_(2)F与其他常见绝缘气体SF_(6)和C_(4)F_(7)N的相关性质;最后综合分析了CF_(3)SO_(2)F气体的热电弧开断能力。结果表明,在较高的气压下,CF_(3)SO_(2)F气体的分解和电离反应可以被有效抑制;此外,比定压热容分析表明该气体在混合气体中的比例越高,低温区的分解反应越剧烈,高温区的电离反应越平缓;气体种类也会显著影响等离子体的输运特性,不同体系中电导率大小和热导率峰位置等存在较大差异;根据质量密度和比定压热容的乘积(ρc_(p))指标还可以推断CF_(3)SO_(2)F具有较常见绝缘气体C_(4)F_(7)N更强的热电弧开断能力,尽管引入缓冲气体会降低其开断能力,但引入CO_(2)对灭弧性能的负面影响更小。Sulfur hexafluoride(SF_(6))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 SF_(6) 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 C_(4)F_(7)N and C5F10O,but improvements are needed due to factors such as high liquefaction temperature,GWP values,and toxicity.Trifluoromethyl sulfuryl fluoride(CF_(3)SO_(2)F)has recently emerged as a highly promising replacement,exhibiting superior performance compared to SF_(6) and a much lower GWP of 3678(around 15% of SF_(6)'s GWP).Thus,CF_(3)SO_(2)F shows excellent potential as a substitute for SF_(6) in insulation applications.Accurate calculations of CF_(3)SO_(2)F'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 CF_(3)SO_(2)F gas and its mixture in arc plasma,wherein equilibrium compositions of the plasma within the temperature range from 300 K to 30000 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 CF_(3)SO_(2)F mixture system was explored,along with a comparison of relevant properties between CF_(3)SO_(2)F and other commonly used insulating gases such as SF_(6) and C_(4)F_(7)N.Finally,the thermal arc breaking capacity of CF_(3)SO_(2)F gas was comprehensively analyzed.The results of particle composition calculations for CF_(3)SO_(2)F-N_(2) mixtures show that as the tempe

关 键 词：CF_(3)SO_(2)F 环保绝缘气体 等离子体 粒子组分 物性参数 

分 类 号：TM561[电气工程—电器]