Study on the factors influencing the ice shedding jump response of transmission lines

This study delves into the vibrational response triggered by the sudden detachment of ice from transmission lines, aiming for a comprehensive understanding of the factors influencing ice shedding vibration. It undertakes a thorough examination of ice shedding on transmission lines using electromagnets to mimic the weight of ice, in conjunction with off-delay time relays, to construct 16 parallel circuits. By conducting a model test, the study investigates the jumping height and dynamic tension in transmission lines under varying ice thicknesses. To broaden the scope of inquiry, a finite element analysis is performed on multi-span transmission line shedding, employing the birth and death element method. This analysis explores the effects of span length, temperature, height variations, and conductor type on the shedding response. The results indicate that simulating ice shedding using the birth and death element method yields high accuracy, with an error margin of less than 5%. Notably, the height of ice shedding jump increases with thicker ice, longer spans, and higher temperatures, while it decreases with greater height differences and smaller conductor cross-sectional areas. Similarly, the dynamic stress in transmission lines rises with thicker ice, longer spans, and greater height differences, but decreases with higher temperatures and conductor cross-sectional areas. Among these factors, ice thickness, span length, and conductor cross-sectional area have the most pronounced impact on the ice shedding response.