Mechanical Characteristics of Ice-melting and Ice-shedding under Conductor Galloping

Abstract

Ice accretion on transmission lines is a natural phenomenon which is very common in cold regions. Conductor galloping caused by ice accretion and conductor jumping induced by ice shedding are important causes of safety accidents. In this paper, the phenomena of instantaneous ice-shedding and ice-shedding during the ice-melting process of galloping conductor were simulated. The movement law and dynamic load of the galloping conductor when instantaneous ice-shedding occurs were explored. The dynamic response of iced conductors during ice-melting under galloping was studied based on the widely used AC/DC ice-melting measure for anti-galloping, and the influence of ice-melting rate and ice amount on conductor galloping was simulated. The results show that during the ice-melting stage of the steadily galloping conductor, the highest point of the vertical movement of the conductor moves up accordingly, and the conductor can basically maintain a galloping state before ice-shedding. The highest point of the vertical displacement of the conductor in the ice melting process increases with the melting rate and the mass of ice melting, and the jumping height of the conductor after ice-shedding decreases as the mass of ice melting increases.