ボルツマン方程式による3成分混合ガス(N_2/SF_6/c-C_4F_8)の電子スウォームパラメータ解析(II)

概要

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It is well known that the ternary gas mixtures, comprised of N_2,SF_6,and c-C_4F_8,have excellent dielectric characteristics under both uniform and non-uniform fields. Electron swarm parameters such as ionization coefficients and electron attachment coefficients for the gas mixtures have been calculated by a Boltzmann equation to investigate basic physical processes in these gases. The authors have already reported that the electron attachment properties of the gas mixtures are basically dependent on the synergistic behavior between SF_6 and c-C_4F_8. In this paper, the authors analyze and discuss the electron swarm parameters of the gases, to study the effect of N_2 mixture ratios. The question is which ratio, 60,70,or 80 percent, is better for use as practical electric insulating gas. It is found the more the N_2 ratio increases, the less electron attachment decreases, and the less the N_2 ratio decreases, the more electron attachment increases, because of synergisms of SF_6 and c-C_4F_8 increasing. As a result, this analysis predicts the desirable ratios of N_2 may be near or less 70 %.
東海大学の論文