Alstom Technology Limited

General Electric Technology Gmbh

Jacques Porte

Yannick Kieffel

Alain Girodet

Christophe Creusot

François Biquez

A method and a facility for filling a high- or medium-voltage gas-insulated electrical apparatus in which the insulating gas comprises a mixture of heptafluoroisobutyronitrile ((CF)CFCN) and carbon dioxide. The method and the facility using a mixture of (CF)CFCN and COin pressurised liquid form which is heated to a temperature no lower than the critical temperature of the mixture.

Method and facility for filling a gas-insulated electrical apparatus comprising a mixture of (CF3)2CFCN and CO2

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.

Medium- or high-voltage electrical appliance having a low environmental impact and hybrid insulation

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.

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Lyons, France

Jacques Porte