Study on Discharge Decomposition Characteristics of Environmental-friendly Insulating Medium C5F10O

Abstract

Environmental-friendly insulating medium C5F10O has attracted wide attention due to its good insulation properties, but there are still few researches on the discharge decomposition of C5F10O. Based on density functional theory, the discharge decomposition characteristics of C5F10O are simulated in this paper. Firstly, the possible discharge decomposition paths of C5F10O are analyzed and the energy required for different decomposition paths is calculated. Secondly, the synthetic path of C5F10O decomposition products is discussed, and the energy variation of the synthesis pathway is calculated. Finally, the ionization parameters of C5F10O discharge decomposition products were calculated and the insulation properties were analyzed. The results show that the C-C bond in the molecular structure of C5F10O is the most likely to break, and the process of C5F10O discharge decomposition to form CF3CFCOCF3·and CF3· radical is the most likely to occur. In the decomposition products of C5F10O, C2F6, C5F10and CF4 are easy to be generated, while C3F6, C6F14 and C3F8are relatively difficult to be generated. The ionization energy of C5F10O discharge decomposition products is greater than 11eV, which has a strong insulating ability, certain insulation strength can be guaranteed in GIS/GIL.