Direct current cable insulation with insulating composition incl

Details Direct current cable insulation with insulating composition incl Direct current cable insulation with insulating composition incl

1987-07-16

1988-09-27

Nimmo, Morris H.

Electricity: conductors and insulators

With fluids or vacuum

Conduits, cables and conductors

156 53, 156 56, 174 25R, 174 25G, H01B 902

Patent

active

047743824

ABSTRACT:
A direct current electric cable with a conductor, a semi-conductive screen around and contacting the conductor, a plurality of layers of insulation formed by tapes of insulating material around the semi-conductive screen, a further semi-conductive screen around the layers of insulation and a metal sheath around the further semi-conductive screen, the layers of insulation being impregnated with a non-migrating, insulation composition having a dropping point temperature at least 5.degree. C. above the maximum operating temperature of the cable and having an electronegative gas dissolved therein, the gas having a coefficient of diffusion in the composition in the range from 3.times.10.sup.-5 to 3.times.10.sup.-6 cm.sup.2 /sec at temperatures below the dropping point temperature of the composition.

REFERENCES:
patent: 2067169 (1937-01-01), Beaver et al.
patent: 2149771 (1939-03-01), Hunter et al.
patent: 2650261 (1953-08-01), Davey
patent: 2914430 (1959-11-01), King et al.
patent: 3844860 (1974-10-01), Edwards
patent: 4417093 (1983-11-01), Occhini et al.
patent: 4491684 (1985-01-01), Vecellio

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