Abstract
We explored the thermal decomposition properties of Fluoronitriles-N2 (C4F7N-N2) gas mixture using as SF6 substitute gas in GIE. The yield of main decomposition products of 10 %C4F7N-90 %N2 gas mixture under different overheating temperature and gas pressure conditions were detected and analyzed. We found that thermal decomposition of C4F7N-N2 mainly produces C3F6, C3F8, CF4, CF3CN, (CN)2 and COF2. C3F6 is the first detected by-product at 350℃, while CF4 and C3F8 were generated at temperatures higher than 500℃. The yield and formation rate of C3F6, (CN)2 increases with temperatures lower than 450℃ then decreases at higher temperatures, while the generation of C3F8, CF4, CF3CN and COF2 has positive correlation with temperature. C4F7N-N2 gas mixture has great thermal stability at high pressure. The increase of gas pressure could effectively reduce the decomposition of C4F7N, which ensures the insulation strength of gas mixture.
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