Patent ID: 6245426
Filing Date: 2001-06-12
Classification: H01B,Y10T

Abstract:
An electric DC cable comprising:at least one conductor;a first semi-conducting shield disposed around the conductor;a porous insulation with an open porosity and impregnated with a dielectric fluid such that said porosity is substantially completely filled with said fluid, and thereby substantially free of voids and gas bubbles, outside the first semiconducting shield;a second semi-conducting shield outside the insulation; anda mantle;wherein said dielectric fluid comprises a polymer and a hydrocarbon-based fluid, wherein said dielectric fluid is composed such that a part of the polymer molecules interacts with the hydrocarbon-based fluid or another part of the polymer molecule in such a way that the dielectric fluid:at temperatures within a first low temperature range from about 0.degree. C. to about 100.degree. C. is in a highly viscous and elastic, essentially gelled, state, exhibiting a viscosity of about 10 Pas to about 100 Pas or more;at elevated temperatures within a second higher temperature range from about 80.degree. C. to about 150.degree. C., is in a low viscosity essentially Newtonian easy flowing state exhibiting a viscosity of 200 mPas or less; andthe viscosity of the dielectric fluid is, over a third limited temperature range, the transition range, changed between the low viscosity state and the highly viscous state, and that said transition range comprises temperatures between the first and second temperature ranges.