Mixture of hydrofluoroolefin and fluoroketone for use as a mixture of insulation and / or arc extinction and medium voltage electrical apparatus a gas insulation the comprising

摘要

There is provided a method of providing an electric insulating and/or electric arc extinguishing gaseous medium within a sealed enclosure of a medium-voltage electrical device comprising electrical components, the method including enclosing the gaseous medium in the sealed enclosure, wherein the gaseous medium includes a hydrofluoroolefin comprising three carbon atoms and a fluoroketone comprising five carbon atoms. There is also provided a medium-voltage electrical device, including a sealed enclosure comprising electrical components; and a gaseous medium provided within the sealed enclosure, the gaseous medium being an electric insulating and/or electric arc extinguishing medium, wherein the gaseous medium comprises a hydrofluoroolefin comprising three carbon atoms and a fluoroketone comprising five carbon atoms.