LOW-AUDIBLE NOISE ALUMINIUM CONDUCTORS

摘要

The invention relates to a compound cable, such as an aluminum cable, an aluminum alloy cable, aluminum cable steel reinforced or an aluminum alloy cable steel reinforced with reduced audible noise for use in a high voltage transmission line. The surface of each of the aluminum wires to constitute the outermost layer of the cable is treated in the water or aqueous vapor of more than 90.degree.C so as to form a hydrophilic hydrated film on said surface, or more than 3 grooves are provided on the outer periphery of each of the aluminum wires in excess of 30% of such wires to constitute the outermost layer of the cable, a hydrated film being caused to form on the surface including the grooves thereof, so that the raindrops adhering to the surface may readily disappear due to the improved hydrophilic property and draining property of the surface of the cable thereby enabling to prevent the development of the corona discharge.