Degradation mechanisms of mechanical connectors on aluminium conductors

The factors which affect the performance of mechanical connectors for use on aluminium power cables have been investigated. The initial resistance depends upon surface roughness, mechanical load and degree of plastic deformation. The stability of resistance has been studied under conditions of mechanical-load cycling, stress relaxation, interface oxidation, temperature cycling and current loading. The conditions for designing stable mechanical connectors for use on aluminium conductors are given, and the stability of connectors satisfying these conditions has been illustrated by current-cycling measurements.