Above-ground conductor unit with corona noise reducing covering
AssigneeSocieta' Cavi Pirelli S.p.A.
InventorAttilio Lanfranconi
Life of this patent
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Abstract
An overhead conductor unit used for transmitting high voltage, alternating current, electrical energy which comprises one conductor or several metallic wires grouped together and a thin plastic cladding, a resin or resin-rubber, around the conductor or wires. The plastic cladding includes at least one conductive composition, generally, carbon black, in an amount of 5-40 parts by weight and at least one hydrorepellent composition present in 1-10 parts by weight. The thus obtained overhead conductor unit reduces, or prevents, corona noises when the unit becomes wet.
Claims10
A conductor unit for overhead lines for transmitting high voltage, alternating, electric current, said unit comprising one or more electric conductors and a thin, outermost, semi-conductive layer surrounding and in contact, at its inner surface, with the periphery of said conductor or of the plurality of conductors, said layer comprising a mixture of an insulating material, at least one conductive material in an amount of 5 to 40 parts by weight of the total weight of the mixture and at least one hydrorepellent material in an amount from 1 to 10 parts by weight of the total weight of the mixture, said unit having the characteristic that during rainfall or significant atmospheric humidity, corona noise is suppressed or is drastically reduced as compared to the same unit without a hydrorepellent material in the semi-conductive layer.
Dependencies are inferred from the claim text.