DocumentCode
1299211
Title
Comparison of SF6/N2 and SF6/CO 2 gas mixtures as alternatives to SF6 gas
Author
Qiu, Y. ; Kuffel, E.
Author_Institution
Sch. of Electr. Eng., Xi´´an Jiaotong Univ., China
Volume
6
Issue
6
fYear
1999
fDate
12/1/1999 12:00:00 AM
Firstpage
892
Lastpage
895
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
SF6 insulation; carbon compounds; dissociation; electric strength; gas insulated transformers; gas mixtures; nitrogen; partial discharges; SF6; SF6-CO2; SF6-N2; SF6/CO2 gas mixtures; SF6/N2 gas mixtures; dielectric strength; electrical apparatus; gas decomposition; gas-insulated transformers; gas/film insulation; greenhouse effect; highly nonuniform field problems; partial discharges; slightly nonuniform fields; uniform field breakdown; Breakdown voltage; Dielectric breakdown; Electric breakdown; Electrodes; Equations; Microscopy; Nonuniform electric fields; Rough surfaces; Sulfur hexafluoride; Surface roughness;
fLanguage
English
Journal_Title
Dielectrics and Electrical Insulation, IEEE Transactions on
Publisher
ieee
ISSN
1070-9878
Type
jour
DOI
10.1109/94.822033
Filename
822033
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