Study on Discharge Decomposition Characteristics of Environmental Protection Insulating Medium CF3I

Recently, the environment-friendly insulating gas CF3I has attracted extensive attention due to its good insulating properties. However, there are few studies on the discharge decomposition characteristics of CF3I. In this paper, density functional theory is used to study the possible decomposition reactions of CF3I at the micro level. The energy changes before and after the decomposition path reaction of CF3I were calculated. Meanwhile, the generation path of CF3I discharge decomposition products and the influence of micro-water and micro-oxygen on the decomposition products are discussed. The insulation properties of CF3I discharge decomposition products were analyzed by calculating the ionization parameters of the products. The results show that the energy required by CF3I to decompose into CF3 center dot radical and I- after the direct adsorption of electrons is 226.624 kJ/mol, which is the most likely decomposition path. Under the influence of water and oxygen, the decomposition products of CF3I become complex, and C2F4, I-2, HF and COF2 are more likely to be generated. CF3I discharge decomposition products have strong electrical resistance. Therefore, CF3I can ensure certain insulation strength in gas insulation equipment such as GIS/GIL after discharge decomposition.