Shielded electric cable

Abstract

Shielded electrical cable of the high voltage type having a central conductor with a semiconducting coating surrounded by polymeric insulation, has a shielding assembly that includes a semiconducting layer around the insulation and a multiplicity of aluminum wires which can be grounded, which are individually coated with semiconducting material, and which are arranged in a long helical wrapping around the coated insulation in relatively close spacing to each other. This structure, especially useful underground, provides very effective shielding and fault-current return paths, with a relatively inexpensive aluminum structure that is nevertheless protected from corrosion. There are also advantages of better mechanical protection and less likelihood of cable damage by differential temperature expansion effects.

Dependencies are inferred from the claim text.