Research on the evaluation method of eco-friendly gas in the application of high voltage circuit breaker

In this paper, a comprehensive evaluation method on the insulation performance and greenhouse effect of environmentally-friendly gas was studied. Firstly, considering that the gas greenhouse effect is determined by its atmospheric lifetime and infrared characteristics, and can be assessed by the global warming potential (GWP), this work establishes a regression prediction method for atmospheric lifetime based on the highest occupied orbital energy, combined with molecular infrared spectroscopy theory. The model realizes GWP calculation of any gas, and the maximum error less than 19%. Secondly, this work starts from the collision phenomenon and establishes a theoretical evaluation method. Under the classical collision theory, the collision is reduced to potential scattering, and the molecular electrostatic potential is calculated. It is found that there is a strong correlation between positive potential surface area of small molecules and insulation, which can be used for quantitative analysis. Besides, the collision model considering the quantum effect is studied, and finding that the low-energy resonance phenomenon can be used for qualitative analysis, for the results calculated by R matrix method of 15 gases show that only strong insulation gases such as SF6 can exhibit low-energy resonance.