Research On Dynamic Property Of The Ice-Accreting And Ice-Shedding On Transmission Lines

Ice-shedding from overhead transmission lines will result in the dynamic impact effects on the conductors, which will cause conductor galloping and the conductor will produce a large amplitude jump phenomenon. When the conductor galloping is quite serious, it not only brings great harm to the safe operation of the transmission lines, but also causes significant economic losses and adverse social impact. In order to ensure the security and stability of the transmission lines, it's necessary to master the static and dynamic property of ice-shedding from the transmission lines to provide theoretical guidance for the design and maintenance of transmission lines.Theoretical calculations and finite element simulation on dynamic property of the ice-accreting and ice-shedding from transmission lines should base on field measurement or model experiments. However, domestic and foreign scholars are relatively lack of field measurement or model experiments. In this paper, On the basis of experiment, we combine the experiment with finite element method to study dynamic property of the ice-shedding from transmission lines.The static property of the overhead transmission conductors is firstly analyzed based on the "catenary curve" theory and the "parabolic" theory in this paper, and make the equilibrium as the initial form of the dynamic analysis. And the analyzing results show that the thickness of ice has the greatest influence on the stress of conductors compared with temperature. Secondly, we design a set of experiment device based on the "catenary curve" theory to verify that the dynamic impact effects when ice shedding from transmission lines, and get the damping by experiment data. And then, on the basis of experiment, a three dimensional finite element model of tower-line system is built in ANSYS software. And exerting force method is employed to simulate ice aerating and ice shedding on transmission lines. Finally, the results of finite element simulation are feasible and accurate compared to the experimental results, and we explore the feasibility of simulating the method of local ice-shedding from transmission lines in ANSYS software.