DIELECTRIC GELLING COMPOSITION, THE USE OF SUCH DIELECTRIC GELLING COMPOSITION, AN INSULATED ELECTRIC DC-CABLE COMPRISING SUCH GELLING COMPOSITION, AND A METHOD FOR MANUFACTURING AN INSULATED ELECTRIC DC-CABLE COMPRISING SUCH GELLING COMPOSITION

摘要

Disclosed is a dielectric gelling composition, exhibiting a thermo-reversible liquid-gel transition at a transition temperature, T_t, wherein the gel comprises an oil and a combined gelator system having molecules of a polymer compound together with fine dielectric particles with a particle size in the nanomneter, 6 nm, range, preferably a particle size within the range from 0.001 to 1000 nm, the use of this dielectric gelling composition in an electric device comprising one or more conductors, a casing or enclosure and an insulation system comprising the dielectric gelling composition. An electric DC-cable having a conductor and an electrical insulation comprising a solid part with a porous, fibrous and/or laminated structure impregnated with the dielectric gelling composition and a method for production of such DC-cable wherein the combined gelator is prepared prior to impregnation are also disclosed.