Analysis of Thermal Decomposition Characteristics of C5F10O/CO2 Mixed Insulation Medium

In recent years, C
5
F
10
O has attracted wide attention as a potential alternative gas of SF
6
, and its decomposition characteristics have become a research hotspot. To this end, this article analyzes the thermal decomposition characteristics of C
5
F
10
O/CO
2
mixed insulating medium. Firstly, the saturated vapor pressure characteristics of the mixed insulating medium are obtained by using the Riedel vapor pressure equation and the basic law of vapor-liquid equilibrium, and the application schemes of the mixed insulating medium under different temperature limits are discussed. Secondly, the possible decomposition reaction of C
5
F
10
O was analyzed. The reaction energy of each reaction was calculated by using density functional theory, and the thermal decomposition path of C
5
F
10
O was determined. Finally, the Dalton law of partial pressure, the law of mass action, the quasi-neutral conditions of charge, and the stoichiometric equilibrium conditions are used to establish a mathematical model, and the particle number density of C
5
F
10
O/CO
2
high-temperature plasma at pressure of 0.1mpa and temperature of 300 ∼ 30000K was obtained, and its electronegativity was discussed. The results show that: at 0.1MPa and 248K, the mixed insulating medium with C
5
F
10
O mole fraction below 9% can keep the gas phase. The lowest path of energy required for decomposition of C
5
F
10
O is C
5
F
10
O → CF
3
COCFCF
3
→ CF
3
CFCO → CF
3
CF → CF
3
. The decomposition products have strong electronegativity. The research results can lay a theoretical foundation for arc simulation of C
5
F
10
O/CO
2
mixed insulation medium, insulation characteristics and other problems, and provide reference for the research of C
n
F
2n
O type alternative medium.