混合絶縁気体中の電子衝突過程 : 相乗効果発生機構の検討

概要

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In a recent trend that reduction of SF6 used for electric power equipment is required to avoid global warming, dilution of SF6 by other gases of less environmental load is considered as a practical solution. Gas mixtures such as SF6/N2 and SF6/c-C4F8 have a desirable feature called synergy effect that the critical values of reduced electric field (E/N)lim are higher than the partial-pressure-weighted values obtained from (E/N)lim of their components. In order to obtain a guide to seek for new insulating gas mixtures with the synergy effect, we have investigated the synergy mechanism from a viewpoint of collaboration between electron energy loss by collisions and electron attachment. The following mechanisms have been indicated as primary factors of the synergy effect; (i) a large attachment cross section of SF6 lying in a low electron energy region plays the main role of the electron capture; (ii) in order to feed electrons into the low energy region of (i) efficiently, a steep rise of an inelastic collision cross section at its onset energy is required. We have evaluated these factors by a Boltzmann equation analysis, and have synthesized the synergy effect using model gases for demonstration.
社団法人電気学会の論文
2004-02-01