Comparison of SF6/N2 and SF6/CO2 gas mixtures as alternatives to SF6 gas |
| |
Authors: | Qiu Y Kuffel E |
| |
Affiliation: | Sch. of Electr. Eng., Xi'an Jiaotong Univ.; |
| |
Abstract: | The interest in SF6 gas mixtures has been re-ignited in recent years by the issue of the greenhouse effect of the SF6 gas, and most research work is now focused on a SF6/N2 gas mixture, which is suitable for application in electrical apparatus with slightly non-uniform fields. This paper presents a comparison of SF6/N2 and SF6/CO2 gas mixtures with a viewpoint of their possible applications to gas-insulated transformers, where both highly non-uniform field problems and partial discharges in gas/film insulation are inevitable. It is shown that in this case the dielectric strength of SF6/CO2 is superior to that of SF6/N 2 with a minor disadvantage related to the gas decomposition in SF6/CO2. However, this may not be a problem for the SF6/CO2 gas mixture to be used in gas-insulated transformers, where internal breakdown is not allowed |
| |
Keywords: | |
|
|