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中南大学学报(英文版)

Journal of Central South University

Vol. 24    No. 4    April 2017

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Breakdown characteristics of CF4 and CF4/N2 hybrid gas in refrigeration temperature range
HOU Meng-xi(侯孟希)1, LI Wei-guo(李卫国)1, YUAN Chuang-ye(袁创业)1, YANG Yi-xin(阳以歆)1, OUYANG Jie(欧阳洁)2

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

Abstract: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 CF4 and CF4/N2 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%, CF4/N2 is the greatest potential hybrid gas.

 

Key words: dew-point; refrigeration temperature range; CF4; gas insulation

中南大学学报(自然科学版)
  ISSN 1672-7207
CN 43-1426/N
ZDXZAC
中南大学学报(英文版)
  ISSN 2095-2899
CN 43-1516/TB
JCSTFT
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