The calculation of the physical property parameters of CF3OCF=CF2/CO2 gas mixture

a newly discovered alternative to SF6

is of great significance for further research on its arc extinguishing characteristics. In this paper

the saturated vapor pressure of the gas mixture is obtained through the Antoine equation and the gas-liquid equilibrium law. Combined with the mass action law model

thermodynamic relations

Chapman-Enskog theory

and the net emission coefficient model

the equilibrium components

thermodynamic parameters

transport coefficients

and net emission coefficient of the arc plasma are obtained. The research results indicate that

if the operating condition of the minimum temperature of -25 ℃ is to be met

the mixing proportion k of CF3OCF=CF2 in the gas mixture at 0.6 MPa should not exceed 12%. By analyzing ρCp

ρh

and the net emission coefficient

it can be inferred that the radial heat conduction ability of the gas mixture is inferior to that of SF6

while its axial heat convection ability is stronger than SF6. Under the same gas pressure and arc radius

the emission ability of the gas mixture is lower than that of SF6 when the temperature is below 7 000 K

and gradually exceeds that of SF6 after 7 000 K. This research can provide basic data for further analysis of the arc extinguishing characteristics of the gas mixture and is helpful for the evaluation and selection of SF6 alternatives.