How To Achieve Uniform Holding Force Of Wires Through Pre-twisted Wires？

In overhead transmission line engineering, armour rod in transmission line is spirally wound along the conductor. During the stranding process, armor rods conductor forms a rigid contact surface with the wound conductor, and the stranding tension is converted into uniform circumferential compressive stress on the periphery of the conductor through the metal wire assembly.

When the conductor is subjected to tensile force, armor rod preformed experiences a slight tightening in the outer layer, and the spiral tightening force is distributed along the length of the conductor, thereby making the gripping force distribution on the conductor cross-section tend to be uniform. The pitch, wire diameter, and stranding density of preformed armour rod together construct a "track"-like load-bearing structure, reducing local stress concentration.