# US 2014/0196932 A1 · Use of a mixture comprising a hydrofluoroolefin as a medium-voltage arc-extinguishing and/or insulating gas and medium-voltage electrical device comprising same > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 2014/0196932 A1 - Document ID: US20140196932A1 - Status: Published application - Kind: A1 - Application number: 14/130,786 - Filed: 2012-07-05 - Published: 2014-07-17 - Earliest claimed: 2011-07-05 - Assignees: Schneider Electric Industries SAS - Inventors: Yannick Kieffel; Alain Girodet; Daniel Piccoz; Romain Maladen - Web page: https://patentgrep.com/patent/US20140196932A1 ## CPC - H05K 5/06: Hermetically-sealed casings {(specially adapted for small components H05K5/0095)} - B65B 31/00: Packaging articles or materials under special atmospheric or gaseous conditions; Adding propellants to aerosol containers - H01B 3/56: gases - H01H 33/56: Gas reservoirs - H01H 2033/566: {Avoiding the use of SF6} - H05K: PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS - B65B: MACHINES, APPARATUS OR DEVICES FOR, OR METHODS OF, PACKAGING ARTICLES OR MATERIALS; UNPACKING (bundling and pressing devices for cigars A24C1/44; devices for tensioning and securing binders adapted to be supported by the article or articles to be bound B25B25/00; applying closure members to bottles, jars or similar containers B67B1/00-B67B6/00; concurrent cleaning, filling and closing of bottles B67C7/00; emptying bottles, jars, cans, casks, barrels or similar containers B67C9/00) - H01B: CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES (selection for magnetic properties H01F1/00; waveguides H01P {; printed circuits H05K}) - H01H: ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES (contact cables H01B7/10; electrolytic self-interrupters H01G9/18; emergency protective circuit arrangements H02H; switching by electronic means without contact-making H03K17/00) ## Abstract The invention relates to the use of a mixture comprising a hydrofluoroolefin, possibly associated with a dilution gas, as a gaseous electrical insulation and/or electrical arc extinguishing medium in substation medium-voltage electrical device. It also relates to medium-voltage electrical device in which electrical insulation and/or electrical arc extinguishing is (are) performed by a gaseous medium comprising hydrofluoroolefin, possibly associated with a dilution gas. ## Claims ### Claim 1 A process for electrically insulating and/or electrical arc extinguishing an electrical device, the process comprising enclosing a gaseous medium within an electrical device containing electrical components, wherein: the gaseous medium comprises a mixture comprising a hydrofluoroolefin with three carbon atoms, said mixture having a global warming potential (GWP) lower than the global warming potential of the hydrofluoroolefin; and the hydrofluoroolefin is present in the mixture at a molar percentage (MHFO) at least equal to 95% of the molar percentage M determined by the formula M=(PHFO/Pmixture)×100, in which Pmixture is a pressure of the mixture at 20° C. in the electrical device and PHFO is a pressure that at 20° C. is equivalent to the saturated vapour pressure (SVP) of the hydrofluoroolefin at a minimum service temperature (Tmin) of the electrical device. ### Claim 2 (depends on 1) The process of claim 1, wherein the hydrofluoroolefin is trans-1,3,3,3-tetrafluoro-1-propene (HFO-1234ze). ### Claim 3 (depends on 1) The process of claim 1, wherein the hydrofluoroolefin is 2,3,3,3-tetrafluoro-1-propene (HFO-1234yf). ### Claim 4 (depends on 1) The process of claim 1, wherein the mixture further comprises a dilution gas. ### Claim 5 (depends on 4) The process of claim 4, wherein the dilution gas is selected from the group consisting of air, nitrogen, oxygen, carbon dioxide, and a mixture of these gases. ### Claim 6 (depends on 1) The process of claim 1, wherein the hydrofluoroolefin molar percentage (MHFO) is between 99% and 110% of the molar percentage M. ### Claim 7 (depends on 1) The process of claim 1, wherein the minimum temperature (Tmin) ranges from −50° C. to 0° C. ### Claim 8 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 this enclosure, wherein: the gaseous medium comprises a mixture comprising a hydrofluoroolefin with three carbon atoms, and has a global warming potential (GWP) lower than the global warming potential of the hydrofluoroolefin; a molar percentage (MHFO) of the hydrofluoroolefin in the mixture is at least equal to 95% of a molar percentage M determined by the formula: M=(PHFO/Pmixture)×100, in which Pmixture is a pressure of the mixture at 20° C. in the electrical device and PHFO is a pressure that at 20° C. is equivalent to the saturated vapour pressure (SVP) of the hydrofluoroolefin at the minimum service temperature (Tmin) of the electrical device. ### Claim 9 (depends on 8) The device according to claim 8, wherein the hydrofluoroolefin is trans-1,3,3,3-tetrafluoro-1-propene (HFO-1234ze) or 2,3,3,3-tetrafluoro-1-propene (HFO-1234yf). ### Claim 10 (depends on 8) The device of claim 8, wherein the mixture further comprises a dilution gas. ### Claim 11 (depends on 10) The device according to claim 10, wherein the dilution gas is selected from the group consisting of air, nitrogen, oxygen, carbon dioxide, and a mixture of these gases. ### Claim 12 (depends on 8) The device according to claim 8, wherein the hydrofluoroolefin molar percentage (MHFO) is between 99% and 110% of the molar percentage M. ### Claim 13 (depends on 8) The device of claim 8, which is a gas-insulated electrical transformer, a gas-insulated line for transporting or distributing electricity or an electrical connection/disconnection device. ### Claim 14 (depends on 1) The process of claim 1, wherein the electrical device is a substation medium voltage electrical device. ### Claim 15 (depends on 1) The process of claim 1, wherein the minimum temperature (Tmin) is selected from the group consisting of −50° C., −45° C., −40° C., −30° C., −25° C., −15° C., −10° C., −5° C., and 0° C.