The present invention relates to an electrical insulation system having a low environmental impact comprising two fundamental elements: a) a gaseous medium formed by one or more highly fluorinated fluoroketones having between 4 and 12 carbons, at least another additional dielectric gas, other than the fluoroketones, with a vapor pressure greater than 500 mbar and less than 15000 mbar at 0 C., such as fluoronitrile (CF.sub.3).sub.2CFCN, for example, and one or more vector gases; and b) a molecular sieve capable of discriminating water molecules from molecules of other gases present in the gaseous medium of the system. The invention also relates to the use of the insulation system and to the medium- or high-voltage electrical switchgear comprising a complete enclosure in which there are arranged live electrical components and an electrical insulation system according to the invention.

The present invention relates to a liquid composition for electrical insulation including a dielectric fluid and an additive, the additive being dissolved in the dielectric fluid and having a 1.sup.st excitation energy which is lower than the 1.sup.st excitation energy of the dielectric fluid.

The present invention relates to a liquid composition for electrical insulation including a dielectric fluid and an additive, the additive being dissolved in the dielectric fluid and having a 1.sup.st excitation energy which is lower than the 1.sup.st excitation energy of the dielectric fluid.

An electrical device containing an enzymatically-degummed vegetable oil is disclosed. Also disclosed are methods for insulating and cooling a transformer using enzymatically-degummed vegetable oils, and methods for adding an enzymatically-degummed vegetable oil to an enclosure of an electrical device. Further disclosed are processes for making dielectric fluids using enzyme-degumming of vegetable oils or using enzyme-degummed vegetable oils as the starting material for the process.

An electrical device containing an enzymatically-degummed vegetable oil is disclosed. Also disclosed are methods for insulating and cooling a transformer using enzymatically-degummed vegetable oils, and methods for adding an enzymatically-degummed vegetable oil to an enclosure of an electrical device. Further disclosed are processes for making dielectric fluids using enzyme-degumming of vegetable oils or using enzyme-degummed vegetable oils as the starting material for the process.

The invention relates to a cable comprising at least one electrically insulating layer obtained from a polymer composition comprising at least one thermoplastic polymer material based on polypropylene, at least one dielectric liquid, at least a first thermally conductive inorganic filler having a morphology M1 and at least a second thermally conductive inorganic filler having a morphology M2 different from M1.

Coated conductors comprising a conductor and a peelable polymeric coating at least partially surrounding the conductor, where the peelable polymeric coating comprises from 1 to 8 microcapillaries which comprise a low-viscosity filler material. Also disclosed are methods for making such coated conductors.

Coated conductors comprising a conductor and a peelable polymeric coating at least partially surrounding the conductor, where the peelable polymeric coating comprises from 1 to 8 microcapillaries which comprise a low-viscosity filler material. Also disclosed are methods for making such coated conductors.

The invention relates to a process for the manufacture of an electric cable comprising an extruded thermoplastic layer obtained from a composition comprising at least one dielectric liquid and at least one thermoplastic polymer chosen from a propylene homopolymer and copolymer, and also to a cable obtained by said process.

The invention relates to a process for the manufacture of an electric cable comprising an extruded thermoplastic layer obtained from a composition comprising at least one dielectric liquid and at least one thermoplastic polymer chosen from a propylene homopolymer and copolymer, and also to a cable obtained by said process.