Simulation and Experimental Research on Decomposition of Eco-friendly C4F7N/CO2 Gas Mixtures

Simulation studies on the decomposition process of eco-friendly C4F7N/CO2 gas mixtures have been extensively studied; however, little attention has been paid to the studies based on reactive molecular dynamics. In order to study the decomposition process of eco-friendly C4F7N/CO2 gas mixtures under typical partial discharge, an emission spectrum test platform is built. The electron temperature and molecular vibration temperature under suspension discharge are tested, and the physical process of partial discharge is simulated by dynamic temperature change. Based on the measured data, a simulation calculation model is established. The results show that the electron temperature in the C4F7N/CO2 gas mixtures is about 6400K, and the molecular vibration temperature is about 4000K under suspended discharge; the free radicals such as CF3, CF2, F and CN are formed in the suspension discharge; CO, CF4, C2F4, C3F6, C3F8, CF3CN and COF2 are generated by free radical recombination. The variation of the type and amount of decomposition products with time is basically consistent with the experimental results. Compared with the molecular vibration temperature, the effect of electron temperature on gas decomposition is more significant. In the decomposition process of C4F7N/CO2 gas mixtures, the temperature distribution characteristics are closely related to the gas decomposition characteristics. When analyzing the mechanism of gas decomposition, the effect of temperature on the decomposition process should be emphasized. ©2023 Chin.Soc.for Elec.Eng.