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SF6 has been widely used as insulating and arc-extinguishing medium in power equipment. Under discharges, lower fluorides of sulfur generated by the dissociations of SF6 will react with unavoidable moisture and oxygen to form corrosive byproducts (etc., SOF2, SO2F2, SOF4). These byproducts will reduce the insulating and arc-quenching capacity of SF6 power equipment, so it is necessary to study their...
When SF6 was designated as a green house gas to be reduced, there has been a wish to use an alternative insulating gas to replace pure SF6 gas. And a fluoroketon, C5F10O attracts great attention as a potential substitute. In this paper, the breakdown characteristics of C5F10O/CO2 as mixtures in nonuniform electric filed and the variation of the mixing ratio with elevation were studied. The positive...
SF6 has been widely used in electrical industry because of its excellent electrical capabilities. However, due to its extremely high Global Warming Potential (GWP), researchers have done lots of investigations on SF6 alternative gases during the last few decades. Unfortunately, all the substitutions have their own drawbacks and limitations and can't be applied in practice. In this paper, the critical...
It's increasing clear that departures from both thermal and chemical equilibrium exist in conditions relevant to high-voltage circuit breakers after current zero. The electron temperature (Te) is often higher than the heavy species temperature (Th). We are intended to investigate the effects of N2 contents on the electron temperature and non-equilibrium composition during the arc decaying process,...
The analysis technique of main SF6 decomposition products (etc. SOF4 and SO2F2) is expected to compensate for the ultra-high frequency (UHF) method in partial discharge (PD) diagnosis and insulation condition monitoring of power equipment. SOF4 and SO2F2 as well as other corrosive byproducts derived from the reactions of SF6 dissociation species (e.g., SF2, SF3 and SF4) with the trace impurities of...
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