Abstract
Overhead electrical conductors are subjected to aeolian vibrations which may induce aluminum wire fatigue breaks at line suspension points and spacer clamps. Such wire failures are essentially due to fretting fatigue occurring at interwire and clamp-wire contact points. Tests have been performed on a typical ACSR (aluminum conductor steel reinforced) conductor. The test benches are based on a new design in which a cyclic deflexion amplitude is imposed at the center of the test specimen through an eccentric shaft. Tests have been conducted with two types of spacer clamps. Individual wire breaks have been recorded, including those occurring at inner layers. Analysis of each specimen has shown that almost all wire breaks initiated at fretting marks. A careful location analysis (both in the conductor cross section and axial direction) has yielded some new results on the cyclic bending behavior of a conductor-clamp system.
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