ELECTRIC POWER TRANSMISSION CABLE PARTICULARLY FOR AN OVERHEAD LINE

The invention concerns an electric power transmission cable, particularly for an overhead power line, comprising at least one central composite ring (1) formed of fibres impregnated by a matrix, of which the specific breaking strength is greater than 0.4 MPa·m3/kg and at least one layer of conductive wires (3) nested within one another, made of aluminium or an aluminium alloy and windings around said ring (1), said cable having an outer diameter at ambient temperature called the initial diameter (Di) and the ratio between the thermal expansion coefficient of the conductive wires (3) and that of the central ring (1) is greater than three. According to the invention, said conductive wires (3) nested within one another are of a geometry such that the increase in the outer diameter of one length of said cable shorter than 45 m, during an increase of temperature lasting two to four minutes, from ambient temperature to a temperature between 150 and 240° C., is less than or equal to 10% of the initial diameter (Di), said cable being subject to a mechanical tension between 10% and 30% of the nominal breaking strength of the cable. The invention also concerns a conductive wire geometry enabling such a level of expansion of the diameter.