Study on the variation law of layered stresses of overhead conductors in high-altitude cold zone

A numerical method is proposed for solving the layered stresses of overhead conductors and applied to analyze the stress distribution of the LGJ-400/35 operating in high-altitude cold zone climatic conditions. The method is crucial for achieving a dynamic increase in line current, ensuring strength and sag safety during periods of peak power demand, and preventing strand breakage caused by fatigue under long-term service conditions. Based on the temperature field results, the layered stress of the conductor is determined through internal and external force balance and deformation compatibility. The method fully considers the transversal deformation of the strands caused by interlayer extrusion, Poisson's effect, and temperature changes.