Abstract：Based on the density functional theory (DFT), the dielectric properties of SF6 alternative gas was studied. The molecular ionization energies and average static electronic polarizability affecting the dielectric strength of gas were calculated, the correlation between gas dielectric strength and those two microscopic parameters was obtained by regression analysis. From the results of correlation, it can be seen that the dielectric strength of gas increases with increasing the molecular ionization energy and average static electronic polarizability. Therefore, the further studies on the characteristics of ionization energy and static average molecular polarizability were developed. The analysis found that both parameters are related to the molecular chain length and the type of functional groups contained in the molecules. The results indicate that only from dielectric strength consideration, the fluoride with large molecular weight is expected to replace SF6 as new insulation gas. This paper provides the basis for screening and designing of SF6 potential alternative gas.
林林, 陈庆国, 程嵩, 邱睿, 张聪. 基于密度泛函理论的SF6潜在可替代性气体介电性能分析[J]. 电工技术学报, 2018, 33(18): 4382-4388.
Lin Lin, Chen Qingguo, Cheng Song, Qiu Rui, Zhang Cong. The Analysis of SF6 Potential Alternative Gas Dielectric Strength Based on Density Functional Theory. Transactions of China Electrotechnical Society, 2018, 33(18): 4382-4388.
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