Abstract
This study presents the surface discharge characteristics of insulating gases, including sulfur hexafluoride (SF6), dry air, and N2, under a non-uniform field. Surface discharge experiments were conducted, with the gas pressure ranging from 0.1 to 0.6 MPa, on samples of epoxy dielectrics under an AC voltage. The experimental results showed that the surface insulation performance significantly improved in insulating gases possessing electronegative gases, such as SF6 and dry air. Surface flashover voltages of SF6 were saturated with an increasing pressure, compared to dry air and N2. The surface discharge mechanism is proposed to explain the improvement and saturation of dielectric characteristics of the electronegative gas in complex dielectric insulations, as well as its influence on the surface flashover voltage. As an application, an insulation design method is discussed with regards to replacing SF6 gas in high-voltage power equipment based on the knowledge of the physics behind gas discharge.
Highlights
Sulfur hexafluoride (SF6 ) plays an important role as an insulating gas in high-voltage power equipment
This study investigated the surface discharge characteristics of epoxy resin in compressed gases, namely SF6, dry air, and N2, in a non-uniform electric field
SF6 and dry air, which are electronegative gases, revealed better insulation performances compared with N2, owing to their electron attachment ability
Summary
Sulfur hexafluoride (SF6 ) plays an important role as an insulating gas in high-voltage power equipment. Despite the outperformance of SF6 , its use in power equipment is becoming increasingly dangerous owing to its high global warming effect, its long atmospheric lifetime, and the high toxicity of decomposed byproducts that result in many environmental problems. The global warming potential (GWP) of SF6 , relative to CO2 , over a 100-year time horizon is 23,500. This means that the global warming effect of 1 kg of SF6 gas is equivalent to that of 23.5 tons of CO2 in the atmosphere. The decomposition products are produced by the electrical and thermal decomposition of SF6 in the presence of other molecules, such as H2 O, SiO2 , N2 , O2 , H2 , and Ar
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