| Title |
The Analysis of DC Plasmas Characteristics on SFSF6 and N2 Mixture Gases |
| DOI |
https://doi.org/10.5370/KIEE.2014.63.10.1485 |
| Keywords |
DC plasmas ; Atmospheric pressure ; Insulation material ; SF_6/N_2 mixture gas ; Fluid model |
| Abstract |
SF_6 gas has been used for power transformers or gas insulated switchgears, because it has the superior insulation property and the stable structure chemically. It has been, however, one of global warming gases and required to reduce the its amount. Some papers have reported that its amount could be reduced by mixing with other gases, such as N_2, CF_4, CO_2 and C_4F_8 and their mixture gases would cause the synergy effect. In this paper, we investigated the characteristics of DC plasmas on SF_6 mixture gases with N_2 at atmospheric pressure. N_2 gas is one of cheap gases and has been reported to show the synergy effect with mixing SF_6 gas, even though N_2 plasmas have electron-positive characteristics. 38 kinds of SF_6/N_2 plasma particles, which consisted of an electron, two positive ions, five negative ions, 30 excitation and vibration particles, were considered in a one dimensional fluid simulation model with capacitively coupled plasma chamber. The results showed that the joule heating of SF_6/N_2 plasmas was mainly caused by positive ions, on the other hand electrons acted on holding the SF_6/N_2 plasmas stably. The joule heating was strongly generated near the electrodes, which caused the increase of neutral gas temperature within the chamber. The more N_2 mixed-ratio increased, the less joule heating was. And the power consumptions by electron and positive ions increased with the increase of N_2 mixed-ratio. |