Research on monitoring method for ice-covered state of transmission lines based on conductor end displacement

Abstract

To efficiently and economically monitor the status of transmission lines in frozen rain areas, we propose a method, which can monitor the status of ice- covered transmission lines based on conductor end displacement. Firstly, we delve into the factors that contribute to icing on transmission lines and the subsequent mechanical implications. Subsequently, we propose an equal-height double-node conductor model that aptly captures the stress characteristics of transmission lines in frozen rain environments. This model utilizes the horizontal displacement of the mid-span endpoint and the wire's load as proxies for the variations in horizontal tension and sag. Furthermore, we establish the overall static balance equation for continuous overhead conductors, grounded in the principle of nodal force equilibrium. We then elaborate on the operational framework of our monitoring model. A comparative analysis with existing models reveals the superior accuracy and computational efficiency of our proposed model. To validate our approach, we construct a real-world transmission line setup and assess the economic viability of various monitoring strategies. Additionally, we examine the impact of varying icing thicknesses and locations on the transmission line's status. Our findings indicate that our model outperforms traditional counterparts in terms of accuracy, computational speed, and cost-effectiveness. Specifically, at ice-covered sections, the maximum sag and tension of the conductor exhibit a direct correlation with the ice thickness. Conversely, in non-ice-covered areas, the maximum sag inversely correlates with ice thickness, while the tension maintains a direct relationship.