Effects of elevated temperatures on the change in mechanical properties of overhead conductors = Učinek povišanih temperatur na spremembo mehanskih lastnosti daljnovodnih vodnikov
Jakl, Franc ; Jakl, Andrej
Apart from a correct and optimal selection of individual elements assuring a safe operation of the electric power system as a whole, a great importance should also be laid on conditions under which ...such elements operate. In the overhead transmission line technique we are being persistently faced with the issue of the thermal stressing of overhead lines resulting into great changes in mechanical properties of conductors at elevated temperatures. The paper offers results of the most recent laboratory research in mechanical properties of hard-drawn wires made of aluminium Al 99,5 and AlMg1E aluminium-alloy, and conductors and ground wires stranded with them and ranging within the temperature interval from 20°C to 150°C. In Slovenia, such wires are mostly used in teh 110, 220 and 400 kV transmission network. The paper is particularly focused on a comparison between changes in mechanical properties of hard-drawn wires made of aluminium Al 99.5 and those observed in the homogeneous Al 500 conductor of the 500 ▫$mm^2$▫ cross-section (also named the "Vidmar's" conductor) which it then compares with the same conductor made of AlMg1E aluminium-alloy at elevated temperatures according to the method set up by J. R. Harvvey and V. T. Morgan. The described approach was supported by a computer program developed by the authors of this paper.
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