Abstract
Regarding the use of SF6 in medium voltage switchgear (MVS), a review of alternatives was encouraged by the European Parliament in Regulation No 517/2014. This is aimed at a new regulatory change, that is expected soon, which will include its prohibition, similar to what has happened with other fluorinated greenhouse gases in other fields, like refrigeration. Therefore, there is an urgent need to study the physical and chemical properties of alternative gas mixtures to determine if they are suitable to replace SF6. In this context, this work addresses the difusional analysis of new gases. Binary and ternary mixtures made of 1,3,3,3-tetrafluoropropene (C3F4H2) and heptafluoroisopropyl trifluoromethyl ketone (C5F10O), using dry air as a carrier gas, were studied. The mixtures were analyzed using original equipment, composed of UV-Vis spectroscopy technology in a sealed gas chamber, which is similar to MVS. Consequently, an experimental equipment that monitors the concentration of a gas mixture online and a model that predicts the mixing process were designed and tested. The concentration profiles were obtained concerning both the time and position in the gas chamber, and the diffusional and convectional parameters were numerically calculated and optimized in an algorithm created in Scilab.
Highlights
Sulfur hexafluoride, SF6, is the most widely applied gas in the electric market for insulation and electric arc quenching due to its high stability, high dielectric strength, and non-toxicity [1]
The results show that the sensitivity of the measuring system for Theiscalibration curve of than eachthe component and due measurement is shown in Figure considerably lower one of PFK5, to the greatline difference in the molar
It has been possible to determine the duration of the mixing process of new insulating gas mixtures made of PFK5 and HFO3E, candidates to replace SF6 in medium voltage switchgear (MVS)
Summary
SF6 , is the most widely applied gas in the electric market for insulation and electric arc quenching due to its high stability, high dielectric strength, and non-toxicity [1]. It is commonly used in gas-insulated switchgear (GIS), gas-insulated transformers (GIT), gas-insulated lines (GIL), and gas-insulated circuit breakers (GICB) [2]. It is considered a very strong greenhouse gas, with a global warming potential (GWP) of about 23,500 on a 100-year horizon, making SF6 the compound with the highest value according to the Fifth Assessment Report (AR5) of the Intergovernmental.
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