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

• Published in: Journal of Central South University Vol. 24; no. 4; pp. 861 - 865
• Main Authors: Hou, Meng-xi, Li, Wei-guo, Yuan, Chuang-ye, Yang, Yi-xin, Ouyang, Jie
• Format: Journal Article
• Language: English
• Published: Changsha Central South University 01.04.2017; Springer Nature B.V
• Subjects: Breakdown; Corresponding states; Engineering; Insulation; Metallic Materials; Refrigeration; Repair & maintenance; dew-point; gas insulation; CF; refrigeration temperature range
• ISSN: 2095-2899; 2227-5223
• DOI: 10.1007/s11771-017-3488-7

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.