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The researches of influence of strengthening on fatigue strength of aluminium wires for OHL conductors

Jurkiewicz Bartosz, Smyrak Beata, Zasadzinska Malgorzata, Franczak Krystian, Strzepek Pawel

Archives of Civil and Mechanical Engineering

2019

Vol. 19, no. 3

862--870

The traditional overhead conductors (OHL conductors) are made from a high strength steel core and several layers of aluminium wires. Operating conditions under variable stress derived from von Karman vortices leads to fatigue cracking of the outer layer of wires, first of the outer layer, and then the inner layers. The dynamic component of tension, dependent on the static tension of the wire, its geometric construction and rigidity (the number and diameter of the wires, the coil angle), lead to fatigue destruction of the wires. The conse-quence of this is the gradual degradation of the conductor as a whole, which is a decrease in the electrically active cross-section, and as a result of overheating, also in its mechanical properties. The ultimate effect is breaking of the conductor and a fault of the power line. The subject of the paper concerns fatigue strength tests of cold-drawn commercially pure aluminium wires in different temper of strain hardening. The paper attempts to describe fatigue strength, research methodology, description of a research stand. Based on study results and their analysis, conclusions were formulated concerning the differentiation of fatigue strength and EN AW-1370 wires used for overhead power conductors.