Abstract
C4F7N/CO2 mixed gas is one of promising alternative gases for SF6 in high-voltage equipment. The electrical insulation of C4F7N/CO2 mixed gas is critical for design of the insulation system. The contradiction of liquefaction temperature and insulation strength requires a balanced mixing ratio and pressure. The synergistic effect is the key technique to optimize the mixing ratio of C4F7N/CO2 from electrical insulation aspect. In this paper, the synergistic effect between C4F7N and CO2 is studied and applied to calculate the electrical insulation and optimize the content of C4F7N in the mixture. It is found that the synergistic coefficient is related to avalanche parameters of pure gas. A graphic method based on Wieland approximation is proposed to calculate the critical reduced electric field of mixed gas. Based on the derived formula for calculation of the critical reduced electrical field of binary mixed gas, the theoretical optimal mixing ratio is given out.
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