GAS-INSULATED MEDIUM OR HIGH VOLTAGE ELECTRICAL APPARATUS INCLUDING CARBON DIOXIDE, OXYGEN AND HEPTAFLUOROISOBUTYRONITRILE

摘要

The present invention relates to a medium or high voltage electrical apparatus including a sealed enclosure in which electrical components and a gaseous mixture are located, which ensure the electrical insulation and/or the extinction of the electrical arcs that likely to occur in said enclosure, the gaseous mixture including heptafluoroisobutyronitrile, carbon dioxide and oxygen in small quantities. Electrical components that are covered with a solid dielectric layer of variable thickness can be located in the sealed enclosure of the electrical apparatus according to the invention.