Effect of temperature on galloping of iced conductors

Abstract

This article investigates the effect of temperature on galloping of iced conductors, accounting for the influence of sagging and geometric nonlinearity. By extending Irvine’s cable theory to thermo-elasticity problems, an analytical model is proposed to evaluate the effect of thermal stress on galloping of transmission lines. The Lindstedt–Poincare method is then used to solve the model so that the closed-form approximate solution is derived. The derived solution is then verified using numerical examples, which also displays the variation in galloping amplitude with temperature, as well as with respect to static horizontal tension, span length and wind speed. It is concluded that the thermal stress may have effects on galloping amplitude and that the temperature effects should not be neglected. Furthermore, the effect of temperature on galloping amplitude is related to static horizontal tension, span length and wind speed, and a positive temperature change does not necessarily decrease the galloping amplitude.