USE OF MIXTURE COMPRISING HYDROFLUOROOLEFIN AS MEDIUM-VOLTAGE ARC-EXTINGUISHING AND/OR INSULATING GAS AND MEDIUM-VOLTAGE ELECTRICAL DEVICE COMPRISING SAME Russian patent published in 2016 - IPC H01B3/56 H01H33/56 H02B13/55 

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_HFO) at least equal to 95 % of molar percentage M determined by formula M=(P_HFO/P_mixture)×100, in which P_mixture is pressure of mixture at 20 °C in electrical device, and P_HFO is pressure that at 20 °C is equivalent to saturated vapour pressure (SVP) of hydrofluoroolefin at a minimum service temperature (T_min) 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