Breakdown characteristics of CF4 and CF4/N2 hybrid gas in refrigeration temperature range  

作　　者：HOU Meng-xi LI Wei-guo YUAN Chuang-ye YANG Yi-xin OUYANG Jie 侯孟希;李卫国;袁创业;阳以歆;欧阳洁

机构地区：[1]School of Electrical and Electronic Engineering, North China Electric Power University, Beijing 102206, China [2]Measuring Center of State Grid Hunan Electric Power Corp, Changsha 410000, China

出　　处：《Journal of Central South University》2017年第4期861-865,共5页中南大学学报（英文版）

基　　金：Project(51277063)supported by the National Natural Science Foundation of China

摘　　要：Common insulation gas cannot normally work in refrigeration temperature range(153-243 K), especially in extremely cold regions. To solve this problem, this essay uses cubic equation combined with two-parameter model in theorem of corresponding states to estimate dew-point of hybrid gas. The influence of temperature on mixing ratio is studied by using van der Waals equation. The result shows that the mixing ratio is stable during temperature-fall period. Insulation property of CF_4 and CF_4/N_2 in refrigeration temperature range is studied through self-designed low-temperature test system. The result shows when the density of hybrid gas is invariable, temperature changing has less influence on breakdown voltage, and when the mixing ratio is 20%, CF_4/N_2 is the greatest potential hybrid gas.Common insulation gas cannot normally work in refrigeration temperature range(153-243 K), especially in extremely cold regions. To solve this problem, this essay uses cubic equation combined with two-parameter model in theorem of corresponding states to estimate dew-point of hybrid gas. The influence of temperature on mixing ratio is studied by using van der Waals equation. The result shows that the mixing ratio is stable during temperature-fall period. Insulation property of CF_4 and CF_4/N_2 in refrigeration temperature range is studied through self-designed low-temperature test system. The result shows when the density of hybrid gas is invariable, temperature changing has less influence on breakdown voltage, and when the mixing ratio is 20%, CF_4/N_2 is the greatest potential hybrid gas.

关 键 词：dew-point REFRIGERATION temperature RANGE CF4 gas INSULATION 

分 类 号：TM21[一般工业技术—材料科学与工程]