| 摘要 |
FIELD: chemistry.SUBSTANCE: invention relates to use of a mixture comprising a hydrofluoroolefin with three carbon atoms, said mixture having a global warming potential (GWP) lower than global warming potential of hydrofluoroolefin, gaseous medium for electrical insulation and/or electric arc extinguishing in electric device of medium-voltage substation. wherein hydrofluoroolefin is present in mixture at a molar percentage (M) at least equal to 95 % of molar percentage M determined by formula M=(P/P)×100, in which Pis pressure of mixture at 20 °C in electrical device, and Pis pressure that at 20 °C is equivalent to saturated vapour pressure (SVP) of hydrofluoroolefin at a minimum service temperature (T) of electrical device. Invention also relates to a medium-voltage electrical device, comprising a sealed enclosure in which electrical components are located together with a gaseous medium providing electrical insulation and/or electric arc extinguishing within said enclosure.EFFECT: technical result is low impact on environment of gaseous mixture with high dielectric strength.13 cl, 4 dwg, 6 tbl |
