中国电机工程学报Issue(19)：200-207,8.
1个大气压下50%SF6-50%CF4混合气体电击穿特性的研究
Study of Dielectric Breakdown Properties in 50%SF6-50%CF4 Mixtures at 1 atm
摘要
Abstract
The reduced critical electric field strength is an important indicator for the evaluation of dielectric breakdown of SF6 and its mixtures. The electron energy distribution function, reduced ionization coefficient and attachment coefficient of SF6-CF4 mixtures were obtained at 1atm and gas temperatures to 3000K, by two-term Boltzmann equation analysis. Then the reduced critical electric field strength could be determined. The results show that, at temperature above 1 800 K, the reduced critical electric field strength of 50%SF6-50% CF4 mixture is higher than SF6 gas; at temperature beyond 2600K, different from the cases in pure SF6 and SF6-N2 mixtures, due to the dissociation of CF4, the reduced critical electric field strength of 50%SF6-50%CF4 mixture increases with the temperature rising. In order to validate the calculation method and parameters, the reduced effective ionization coefficient and reduced critical electric field strength of SF6-CF4 mixtures under ambient temperature and 1 atm were calculated and compared with other literatures. The comparison results confirmed the validity of the presented calculation method and parameters.关键词
绝缘特性/热态气体/SF6-CF4/临界击穿场强/Boltzmann方程Key words
dielectric properties/hot gas/SF6-CF4/critical electric field/Boltzmann equation分类
信息技术与安全科学引用本文复制引用
赵虎,李兴文,贾申利,刘之方,董勤晓..1个大气压下50%SF6-50%CF4混合气体电击穿特性的研究[J].中国电机工程学报,2013,(19):200-207,8.基金项目
国家自然科学基金项目(50877059,51222704)。Project Supported by the National Natural Science Foundation of China (50877059,51222704) （50877059,51222704）
