A dielectric, including a halogenated olefin having from 2 to 4 carbon atoms, and having a water content of 6000 ppm or less in terms of mass.

The present invention relates to an apparatus for the generation, transmission, distribution and/or usage of electrical energy. The apparatus comprising a housing enclosing an insulating space and an electrical component arranged in the insulating space. The insulating space containing a dielectric insulation gas comprising an organofluorine compound. The apparatus further comprises a desiccant arranged such as to come into contact with the insulation gas. The desiccant contains or essentially consists of lithium bromide.

The present application concerns a medium- or high-voltage equipment including a leaktight enclosure in which there are located electrical components and a gas mixture for providing electrical insulation and/or for extinguishing electric arcs that are likely to occur in the enclosure, the gas mixture including heptafluoroisobutyronitrile, carbon dioxide, and a high content of oxygen

The present application concerns a medium- or high-voltage equipment including a leaktight enclosure in which there are located electrical components and a gas mixture for providing electrical insulation and/or for extinguishing electric arcs that are likely to occur in the enclosure, the gas mixture including heptafluoroisobutyronitrile, carbon dioxide, and a high content of oxygen

Embodiments of the disclosure can include a circuit breaker, comprising an enclosure comprising: arcing contacts movable axially relative to each other, between an open position of the circuit breaker in which the arcing contacts are separated from each other and a closed position of the circuit breaker in which the arcing contacts are in contact with each other; and a gas inlet configured to blow an arc-control gas to interrupt an electric arc during movement of the arcing contacts from the closed position to the open position, wherein the arc-control gas comprises at least 80% of carbon dioxide; wherein the enclosure further comprises an adsorbing material, which adsorbs carbon monoxide after ionization of the carbon dioxide during arcing, said adsorber being a metal-organic framework comprising nickel and/or iron.

An electrical energy transmission device for the transmission of electrical energy has a fluid-holding chamber. An electrically insulating fluid is contained in the fluid-holding chamber. The electrically insulating fluid is, at least in part, air-drawn from the surroundings of the electrical energy transmission device. The insulating fluid is used for insulating phase conductors in order to avoid short circuit conditions.

An electrical energy transmission device for the transmission of electrical energy has a fluid-holding chamber. An electrically insulating fluid is contained in the fluid-holding chamber. The electrically insulating fluid is, at least in part, air-drawn from the surroundings of the electrical energy transmission device. The insulating fluid is used for insulating phase conductors in order to avoid short circuit conditions.

A medium or high voltage electrical device and method of maintaining the composition of an insulating gas mixture in a medium or high voltage electrical device, where the device comprises a sealed chamber, said sealed chamber comprising electrical components; a gas mixture ensuring electrical insulation and/or extinguishing of electrical arcs produced in this chamber, wherein the gas mixture comprises at least one insulating gas and at least one dilution gas; and a receptacle, said receptacle comprising an opening, at least one wall, wherein at least one wall is a heatable wall, and wherein said receptacle is positioned to receive liquefied gas; the device further comprising a heating element for heating the heatable receptacle wall; and a dielectrically and thermally insulating layer located between the heatable receptacle wall and the chamber.

A medium or high voltage electrical device and method of maintaining the composition of an insulating gas mixture in a medium or high voltage electrical device, where the device comprises a sealed chamber, said sealed chamber comprising electrical components; a gas mixture ensuring electrical insulation and/or extinguishing of electrical arcs produced in this chamber, wherein the gas mixture comprises at least one insulating gas and at least one dilution gas; and a receptacle, said receptacle comprising an opening, at least one wall, wherein at least one wall is a heatable wall, and wherein said receptacle is positioned to receive liquefied gas; the device further comprising a heating element for heating the heatable receptacle wall; and a dielectrically and thermally insulating layer located between the heatable receptacle wall and the chamber.

A gas leakage detection system 1 with high detection accuracy for a remaining gas amount and a gas leakage amount of an insulation gas 28 in a container 27 forming a electrical apparatus 2 is provided. The gas leakage detection system 1 includes: the electrical apparatus 2 including: the container 27 to which a power distribution apparatus 29 is fixed and in which the insulation gas 28 is contained; a plurality of divided spaces 21 in the container 28 divided in parallel with a ground; a plurality of temperature sensors 22 which detects temperature of the insulation gas 28 and which is positioned in the plurality of the divided spaces 22; and a pressure sensor 23 which detects a pressure in the container 27; and a monitor 3 which calculates the remaining gas amount Mg of the insulation gas 28 remaining in the container 27 based on the temperature Ta and Tb of the insulation gas 28 detected by the plurality of the temperature sensors 22 and the pressure Pg of the insulation gas 28 detected by the pressure sensor 23.