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As one of the most commonly used insulating mediums, in electrical discharge, sulfur hexafluoride (SF6) will decompose in the presence of water vapor and oxygen, producing various gaseous by-products. It is shown that the concentrations and production rates of SF6 gaseous decomposition by-products heavily depend on electrical field to gas density ratio (E/N) under corona discharge. Regarding the difficulty...
Because of its high dielectric strength, good partial discharge capability, low global warming potential (GWP), none ozone depletion potential (ODP) and non-toxicity, fluorocarbon gas is a possible substitute for SF6 gas, and can be used hopefully in electrical equipment, such as GIL, C-GIS. Arc voltage and potential gradient are useful in arc modeling and computational investigation of gas insulated...
The AC breakdown voltages of a fluorocarbon were measured under three states, including in gaseous state, in boiling two phase flow state and in liquid state. Because the insulating medium in two phase flow could be used in some electrical apparatus, the author measured the breakdown voltage of two phase flow under various pressures in the vessel, various water contents in the coolant. The results...
As some fluorocarbons have the nonflammability and high electrical strength, they could be used not only as coolant, but also as insulating materials. In order to obtain the AC breakdown voltage of some fluorocarbons under two-phase- flow condition, special experimental equipment was designed and fabricated. Using a plane-plane electrode with a gap length of 3 mm, the test was carried out and the...
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