A simulation of positive corona pulse current in the gas mixtures (SF/sub 6/, N/sub 2/, c-C/sub 4/F/sub 8/)

Abstract

In this paper, we simulate a positive corona discharge in pure SF/sub 6/ gas, binary gas mixtures (SF/sub 6//N/sub 2/ and SF/sub 6//c-C/sub 4/F/sub 8/), and ternary gas mixtures (SF/sub 6//N/sub 2//c-C/sub 4/F/sub 8/). The purpose of the simulation is to compare and discuss the dielectric characteristics of the gases (760 Torr, a point-plate gap) using the one-dimensional continuity equations presented by R. Morrow. In this simulation, the distribution of charged particles (electrons, positive ions, and negative ions) density, electric field distribution, and corona pulse current in each gas are computed. It is confirmed from the results of the simulation that the value of the pulse current peak and the development distance of corona streamer head from the anode in the ternary gas mixture (SF/sub 6//N/sub 2//c-C/sub 4/F/sub 8/) are much less than those in the binary gas mixture (SF/sub 6//N/sub 2/) under the same applied voltage and gap length. The values of the peak and the distance of the corona development in the binary gas mixture (SF/sub 6//c-C/sub 4/F/sub 8/) are restrained than the others. >