Shielded electric cable

Details Shielded electric cable Shielded electric cable

1976-03-15

1977-05-24

Grimley, Arthur T.

Electricity: conductors and insulators

Anti-inductive structures

Conductor transposition

174108, 174115, 174120SC, H01B 1106, H01B 718

Patent

active

040257150

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.

REFERENCES:
patent: 1832455 (1931-11-01), Gilbert
patent: 1873470 (1932-08-01), Peek, Jr. et al.
patent: 2320313 (1943-05-01), Thomas et al.
patent: 2604509 (1952-07-01), Blanchard
patent: 3351706 (1967-11-01), Gnerre et al.
patent: 3735025 (1973-05-01), Ling et al.
patent: 3876462 (1975-04-01), Carini et al.

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