Submarine electric cable with improved voltage breakdown...

Details Submarine electric cable with improved voltage breakdown... Submarine electric cable with improved voltage breakdown...

H - Electricity

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H01B 7/14 (2006.01) H01B 3/20 (2006.01) H01B 3/52 (2006.01) H01B 9/02 (2006.01) H01B 9/06 (2006.01)

Patent

CA 1177922

ABSTRACT A direct current, electric, submarine cable which may be used in long lengths and at great depths and which has improved voltage breakdown characteristics with respect to voids which form in the insulation. The cable has a conductor surrounded by an inner semi-conductive screen which is sur- rounded by cellulose paper tape insulation which is surrounded by an outer semi-conductive screen which is surrounded by a metal sheath. The paper tape is impregnated with a compound comprising a viscous hydrocarbon oil containing a substance having polar groups, the amount of the substance being suf- ficient to make the volume resistivity of the compound 100 times lower than the volume resistivity of the tape with the compound therein.

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