Abstract
Sulphur hexafluoride (SF6) gas and SF6 gas mixtures are widely used in gas‐insulated systems (GIS) because they have good dielectric and thermal properties. Among the various gas mixtures investigated so far, SF6‐air, SF6‐CO2, and SF6‐N2 are most used gas mixtures. Also, these mixtures have much technical superiority in GIS. These are nontoxic and nonflammable gases, and they have less sensitivity to nonuniformities and higher liquefaction temperature at high pressure. GIS, switchgears, circuit breakers, and substations are systems that work with alternating current and have nonuniform electric fields. For this reason, in this study the breakdown mechanisms of 0.125, 0.5, 1, and 20% SF6 gas mixtures with rod‐plane configuration under AC voltage are investigated and explained breakdown mechanism.
Highlights
Sulphur hexafluoride (SF6) is the most popular insulating gas in the electric power systems such as switchgears, gas circuit breakers, and gas-insulated stations because of having good electrical, thermal, and chemical properties
SF6 gas and its mixtures with such as air, nitrogen (N2), and carbon dioxide (CO2) have been extensively studied [1,2,3,4,5,6]. e aim of this study is to investigate SF6 mixtures in terms of their electrical strength and to clarify the mechanisms of breakdown
Breakdown properties of SF6 gas mixtures in uniform and quasi-uniform electric field are nearly similar, but their breakdown characteristics in nonuniform electric field depend on various factors such as gas pressure, gas temperature, electrode gap spacing, and gas ratios in the mixture and electrode configuration. e breakdown properties of SF6 gas mixtures in uniform field under impulse and direct voltage have been studied in earlier researches [7,8,9], but the examination of the characteristics in nonuniform fields is open to research
Summary
Sulphur hexafluoride (SF6) is the most popular insulating gas in the electric power systems such as switchgears, gas circuit breakers, and gas-insulated stations because of having good electrical, thermal, and chemical properties. Earlier studies have shown that the breakdown voltage of mixtures of SF6-N2 with below containing 30% SF6 are less than that of pure SF6 at the pressure of 5 bar. As an example at above the pressure of 3 bar, the strengths of 1% SF6-CO2 mixtures are slightly higher than those of pure CO2 at negative impulse voltage [10].
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