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Many researches of trifluoroiodomethane (CF 3 I) have shown that CF 3 I has many excellent properties that make it one of the possible alternatives of SF 6 . This paper reveals the effect laws of CF 3 I gas content, gap distance, gas pressure, polarity, and electric field nonuniform coefficient on the insulation performance of CF 3 I gas mixtures. In general, CF 3 I-N 2 gas mixtures present a superior dielectric strength than CF 3 I-CO 2 under different electric field sets. The experimental results indicate that 20 and 30% content CF 3 I-N 2 gas mixtures can achieve nearly 50 and 55% insulation strength of pure SF6. In addition, to evaluate the arc interruption performance of environmentally friendly gas CF 3 I, we set up a CF 3 I transient nozzle arc model to study its thermodynamic and transport property. The analysis shows that CF 3 I gas has a good arc interruption capability, which mainly functions thermodynamic and transport properties approach that of SF 6 , and some are even better than SF 6 . The decomposition process is also aggravated by impurities including metal and water. The main by-products are greenhouse gases with GWP below that of SF 6 and are lowly toxic and incombustible.

The Performance of Insulation and Arc Interruption of the Environmentally Friendly Gas CF3I