Stress Dispersion Mechanism Of Preformed Wire In Transmission Lines

Overhead transmission line conductors experience concentrated stress at suspension points, which can lead to fatigue fracture of the strands over long-term operation. armor rod preformed is wrapped around the outer layer of the conductor in a spiral winding manner, which transforms the stress concentration at the suspension point into a distributed load, thus protecting the conductor.

The spiral structure of preformed armour rod is opposite to the direction of wire stranding, forming a stress buffer layer with reverse winding. When the conductor bends at the suspension point, armor rods relative slippage occurs between the strands, absorbing some of the bending strain energy. This slippage characteristic means that the outer strands of the conductor no longer directly bear all the bending stress, and the bending radius is increased from the original conductor diameter to 1.5-2 times the outer diameter of armor rods for acsr. The peak stress can be reduced by 40%-60%, extending the conductor's fatigue life at the suspension point.