Submarine electric power cables containing naphthalene based liquids
AssigneeIndustrie Pirelli Societa per Azioni
InventorBernardino Vecellio
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Abstract
An insulating fluid for impregnating the solid insulation of an oil-filled electric power cable, particularly for a cable to be submerged in water, which comprises at least one lower aliphatic derivative of napthalene, preferably, 1 methylnapthalene or 1, 2, 3, 4-tetrahydronapthalene, or mixtures thereof or a mixture of one or more lower aliphatic derivatives of naphthalene with a conventional impregnating fluid. In the latter case, the derivative is present in a significant amount and preferably, is present in an amount sufficient to provide a specific gravity substantially equal to the specific gravity of water. Also, an electric power cable having its insulation impregnated with such insulating fluid.
Claims7
A liquid oil-filled, submarine, electric power cable comprising a conductor surrounded by insulation and at least one longitudinal duct capable of circulating said liquid oil, said duct being substantially filled with and said insulation being impregnated with a liquid oil having a viscosity less than 15 centistokes at 20.degree. C. and a low dielectric factor not greater than 0.001, said liquid oil comprising a naphthalene compound selected from the group consisting of 1-methylnaphthalene, 1-ethylnaphthalene, 2-ethylnapthalene, 1-propylnaphthalene, 1-butylnaphthalene, 2-butylnaphthalene, 2-tert-butylnaphthalene, 1-3-dimethylnaphthalene, 1-6-dimethylnaphthalene, 1,2,3,4-tetrahydronaphthalene and mixtures thereof.
Dependencies are inferred from the claim text.