Analytical Model for Dynamic Tension in Overhead Power Transmission Lines Subject to Strong Wind

Abstract

Dynamic tension in power transmission lines generated by wind-induced vibrations is a critical issue in the design of wind-resistant power transmission towers. Wind-induced vibrations in transmission lines exhibit nonlinear geometric characteristics Using the vibration equation for a continuous cable system, the dynamic tension generated in a transmissio0n line by along-wind loading was decomposed into the two components of static nonlinear effects dependent on the mean wind speed and dynamic linear effects caused by turbulent wind, in the equilibrium plane. The two modes that contribute most to the dynamic tension in a transmission line are the first out-of-plane mode and the first symmetric in-plane mode. This allows the dynamic cable equation to be decoupled, allowing the time- and frequency-domain solutions of the along-wind dynamic tension to be obtained. The effectiveness of this proposed method is demonstrated by a real transmission line and a comparison of the results with a nonlinear finite element analysis.

Keywords

transmission line wind-induced response dynamic tension analytical model

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