Evaluation of Synergy Effect in Electron Capture Mechanism of SF_6/N2 Mixtures
Abstract
In a recent trend that reduction of use of SF6 for electric power equipment is considered to avoid global warming, SF_6/N2 mixture is a potential alternative of less environmental load, because insulating gas superior to SF6 is hardly developed. The limiting E/N values of SF_6/N2 are higher than the values of linear interpolation between those of pure SF6 and N_2, thus SF6 can be diluted with N2 without commensurate decrease in limiting E/N. This feature called synergy effect is explained from a collaboration between SF6 and N2 in the electron capture mechanism: N2 molecules rob electrons of energy by inelastic collisions and SF6 molecules capture the depressed electrons. The aim of this work is to find a quantitative guideline of choosing combinations of components for insulating gas mixtures through attempts to evaluate the synergy effect. We calculated the energy loss rates of electron swarms in SF_6/N2 using a propagator method. The collaborative roles of SF6 and N2 were indicated by the result that the ratio of the electron energy loss concerning N2 exceeds the N2 content ratio. This tendency was remarkable at low N2 content at low E/N.
- Publication:
-
APS Annual Gaseous Electronics Meeting Abstracts
- Pub Date:
- October 2002
- Bibcode:
- 2002APS..GECQWP017S