Electric cable for medium voltage

Details Electric cable for medium voltage Electric cable for medium voltage

1980-08-20

1982-08-03

Kucia, Richard R.

Electricity: conductors and insulators

Anti-inductive structures

Conductor transposition

174105SC, 174106SC, 174120SC, H01B 902

Patent

active

043428800

ABSTRACT:
This invention refers to a medium voltage electric cable (up to about 45 kV) comprising one or more cores, each of said cores being constituted by a conductor covered with an inner semiconductive screen, an insulation layer of extruded polymeric material (preferably, cross-linked polyethylene or ethylenepropylene rubber) and an outer semiconductive screen.
The outer semiconductive screen, which is extruded on the insulation and vulcanized at the same time as the insulation in a continuous vulcanizing line, is constituted by a mixture based on a blend of nitrile rubber and ethylene-propylene rubber and containing carbon black, cross-linking agents and various additives.
The blend of nitrile rubber and ethylene-propylene rubber comprises 50-70 parts by weight of nitrile rubber and 50-30 parts by weight of ethylene-propylene rubber.
The so constituted outer semiconductive screen has good adhesion to the insulation and can be easily removed from said insulation.

REFERENCES:
patent: 2446387 (1948-08-01), Peterson
patent: 2471752 (1949-05-01), Ingmanson
patent: 3645958 (1972-02-01), Palumbo
patent: 3862056 (1975-01-01), Hartman
patent: 3885085 (1975-05-01), Bahder
patent: 4132698 (1979-01-01), Gessler
patent: 4226823 (1980-10-01), Jansson

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