SF6 gas decomposition analysis under point-to-plane 50 Hz AC corona discharge


As one of the foremost commonly used insulating mediums, in electrical discharge, sulfur hexafluoride (SF6) can decompose within the presence of water vapor and oxygen, producing varied gaseous by-products. It's shown that the concentrations and production rates of SF6 gaseous decomposition by-merchandise heavily rely on electrical field to gas density ratio (E/N) below corona discharge. Concerning the problem in measuring E and N, applied voltage and the SF6 pressure, are proposed during this paper to describe E and N, respectively. Several experiments of 50-Hz AC discharges were dispensed beneath totally different applied voltages and totally different SF6 pressures using purpose-to-plane electrodes. The concentrations of SF6 gaseous by-merchandise were measured by a gas chromatograph-mass spectrometer system (GS/MS). Experimental information show that the concentrations of SF6 gaseous by-product increase while the ratio (SOF2+SO2)/SO2F2 decreases, with increasing applied voltage. The concentrations decrease with increasing pressure of SF6. The formation mechanisms of SF6 gaseous by-merchandise with the variations of applied voltage and therefore the SF6 pressure are mentioned, like SO2F2, SOF2+SO2, CF4, and CO2 and therefore on. An experimental expression is derived that connects the SF6 pressure with the concentration of the decomposition by-product.

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