How To Understand The Effect Of Pre-twisted Wire On Stress Dispersion

The spiral structure of armour rod in transmission line is not arbitrarily designed. This structure allows for alteration of the distribution of chemical stress and mechanical load when wound around the conductor. The winding direction of armor rods conductor is opposite to the winding direction of the conductor body. This reverse winding creates a buffer layer, which helps to distribute the load, originally concentrated at a single point, over a longer area, thereby improving the stress pattern.

When the conductor bends at the suspension or tension point, relative sliding occurs between the outer strands and the conductor. This sliding behavior can, to some extent, accommodate bending strain energy, so that the conductor surface no longer bears the entire local load. In this way, armor rod preformed changes the location and manner of stress concentration in the outer layer, resulting in a more uniform stress distribution in the conductor during long-term operation.