Abstract: The present invention provides 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 said enclosure, the gas mixture comprising heptafluoroisobutyronitrile, carbon dioxide, and oxygen in small quantities. Electrical components covered in a solid dielectric layer of varying thickness are located inside said leaktight enclosure of the equipment of the invention.

Abstract: A breaking chamber (1) for a medium- or high-voltage circuit breaker extending along a longitudinal axis (XX?) and comprising: a pair of arcing contact (4, 5), at least one (5) of which is movable along the longitudinal axis (XX?); an arc-blast nozzle (6); a blast chamber (7), having a volume V2 that is constant and that opens out inside the blast nozzle; a compression chamber (8), arranged substantially behind the blast chamber, and structures (73, 81) for putting the internal volume of the compression chamber (8) into communication with the internal volume of the blast chamber (7); and structures (14, 15, 50), disposed substantially behind the compression chamber (8), in order to deliver liquid, either into the compression chamber (8), or directly into the blast chamber (7).

Abstract: 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.

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.

Abstract: The present invention provides 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 said enclosure, the gas mixture comprising heptafluoroisobutyronitrile, carbon dioxide, and oxygen in small quantities. Electrical components covered in a solid dielectric layer of varying thickness are located inside said leaktight enclosure of the equipment of the invention.

Abstract: The present invention relates to medium- or high-voltage equipment having low environmental impact, including a leaktight enclosure in which there are located electrical components covered with a solid dielectric layer of varying thickness and a gaseous medium for providing electrical insulation and/or for extinguishing electric arcs that are likely to occur in said enclosure, and that comprises heptafluoroisobutyronitrile in a mixture with a dilution gas.

Abstract: The present invention relates to switchgear for breaking a medium- or high-voltage electric current, which switchgear comprises a leaktight enclosure in which electrical components are found as well as a gaseous medium for extinguishing the electric arcs likely to occur in said enclosure, and which switchgear is characterized in that: the gaseous medium comprises at least one fluoroketone alone or in a mixture with at least one gas that does not form part of the fluoroketone family; the fluoroketone is present in the enclosure in part in the liquid state and in part in the gaseous state; and in that the enclosure further comprises means for absorbing molecular species that form after the ionization experienced by said fluoroketone during arcing. The invention also relates to a method of manufacturing said switchgear.

Abstract: The invention relates to the use of a mixture comprising a hydrofluoroolefin and a fluoroketone, optionally associated with a dilution gas, as an electric insulating and/or electric arc extinguishing medium in a medium-voltage electrical device. It also relates to a medium-voltage electrical device in which electrical insulation and/or electric arc extinguishing is (are) provided by a mixture comprising a hydrofluoroolefin and a fluoroketone, optionally associated with a dilution gas.

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.

Abstract: The invention relates to the use of a mixture comprising decafluoro-2-methylbutan-3-one and a carrier gas or dilution gas as a medium for electrical insulation and/or for extinction of electric arcs in a medium- or high-voltage electrical device. It also relates to a medium- or high-voltage electrical device in which electrical insulation and/or extinction of electric arcs is/are implemented by a mixture comprising decafluoro-2-methylbutan-3-one and a carrier gas or dilution gas. Applications: electrical transformers, gas-insulated lines for transporting or distributing electricity, set of busbars, electrical connection/disconnection devices (circuit breakers, switches, switch-fuse sets, disconnectors, earthing switches, contactors, etc.).

Abstract: An insulating tube (18) located between the main contacts (12b, 14b) and the arcing contacts (12a, 14a) of an interrupting chamber (10) of a high-voltage or medium-voltage circuit-breaker makes it possible to modify the distribution of the equipotential lines (V) during breaking. Thus, it is possible to reduce the electric field on the contacts, and thus to improve the breaking and the dielectric strength in the open position. The insulating tube (18) can also serve for transmitting movement between the contacts (12, 14) for triggering the circuit-breaker.

Abstract: The present invention relates to switchgear for breaking a medium- or high-voltage electric current, which switchgear comprises a leaktight enclosure in which electrical components are found as well as a gaseous medium for extinguishing the electric arcs likely to occur in said enclosure, and which switchgear is characterized in that: the gaseous medium comprises at least one fluoroketone alone or in a mixture with at least one gas that does not form part of the fluoroketone family; the fluoroketone is present in the enclosure in part in the liquid state and in part in the gaseous state; and in that the enclosure further comprises means for absorbing molecular species that form after the ionization experienced by said fluoroketone during arcing. The invention also relates to a method of manufacturing said switchgear.

Abstract: An electrical insulator including a tube surrounded by an insulating sheath. The insulating sheath is composed of a filled, hardened, flexibilized, hydrophobic, cycloaliphatic epoxy resin containing from 25 to 75 percent by weight of mineral filler. The process for manufacturing this insulator includes the steps of installing the insulator tube or a precursor of the tube in an electrical insulator mold, feeding the filled unhardened hydrophobic cycloaliphatic epoxy resin in the mold so as to form the sheath, hardening the resin inserted in the mold so as to obtain the insulator, and extracting the insulator obtained from the mold.

Abstract: The gas-tight, high or medium voltage electric switch device (1), containing an insulating gas under pressure, comprises switch contacts (2) capable of occupying an open position and a closed position and disposed inside a composite insulator formed by a rigid tube (3) surrounded by an elastomer casing (4) whose outside surface defines a succession of annular fins. The rigid tube and the elastomer casing are arranged so as to define an observation window (7) that is at least translucent, and through which the open or closed position of the switch contacts is visible.

Abstract: Supports for high or medium voltage electrical conductors (6, 7) at potentials different from the potential of an enclosure (1) are supported by disc-shaped parts (4, 5) made from thermoplastic polyester, for example terephthalate polyethylene. The discs (4 and 5) provide good insulation without largely disturbing the electrical field around the conductors due to their fairly low dielectric constant. They are also compatible with use under SF6 gas.

Abstract: An insulating tube (18) located between the main contacts (12b, 14b) and the arcing contacts (12a, 14a) of an interrupting chamber (10) of a high-voltage or medium-voltage circuit-breaker makes it possible to modify the distribution of the equipotential lines (V) during breaking. Thus, it is possible to reduce the electric field on the contacts, and thus to improve the breaking and the dielectric strength in the open position. The insulating tube (18) can also serve for transmitting movement between the contacts (12, 14) for triggering the circuit-breaker.

Abstract: In order to reduce the breaking energy of a high-voltage or medium-voltage circuit-breaker, the interrupting chamber (10) contains two contacts (12, 14) mounted to move in opposite directions, and actuated via a single device (20). The two contacts (12, 14) are surrounded by an insulating casing (18) of tubular shape, coupled in fixed manner to the main contact (12). The contacts (12, 14) are actuated by a device having a lever (24) in which each lever arm is coupled to a link, one of the links (32) being secured to the insulating casing (18) and the other link (34) being secured to the second contact (14). The guiding of the drive tube (18) on the main contacts (12b, 14b) makes it possible to improve breaking by keeping clean gas between said main contacts.

Abstract: The present invention relates to an electrical insulator (1) comprising a tube (3) surrounded by an insulating sheath (5) that may be smooth or provided with fins (7). The insulating sheath is composed of a filled, hardened, flexibilised, hydrophobic, cycloaliphatic epoxy resin containing from 25 to 75% by weight of mineral filler. The process for manufacturing this insulator comprises the steps consisting of installing the insulator tube or a precursor of the tube, in an electrical insulator mould possibly provided with fins, feeding the filled unhardened hydrophobic cycloaliphatic epoxy resin in the mould so as to form the sheath and the fins of the insulator around the said tube or its precursor, hardening the resin inserted in the mould so as to obtain the insulator, and extracting the insulator obtained from the mould. The electrical insulator according to the invention can be used in a high voltage application.

Abstract: Supports for high or medium voltage electrical conductors (6, 7) at potentials different from the potential of an enclosure (1) are supported by disc-shaped parts (4, 5) made from thermoplastic polyester, for example terephthalate polyethylene. The discs (4 and 5) provide good insulation without largely disturbing the electrical field around the conductors due to their fairly low dielectric constant. They are also compatible with use under SF6 gas.

Abstract: In order to reduce the breaking energy of a high-voltage or medium-voltage circuit-breaker, the interrupting chamber (10) contains two contacts (12, 14) mounted to move in opposite directions, and actuated via a single device (20). The two contacts (12, 14) are surrounded by an insulating casing (18) of tubular shape, coupled in fixed manner to the main contact (12). The contacts (12, 14) are actuated by a device having a lever (24) in which each lever arm is coupled to a link, one of the links (32) being secured to the insulating casing (18) and the other link (34) being secured to the second contact (14). The guiding of the drive tube (18) on the main contacts (12b, 14b) makes it possible to improve breaking by keeping clean gas between said main contacts.