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

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.

Keywords

dew-point / refrigeration temperature range / CF₄ / gas insulation

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