Numerical simulation on the HV transmission tower-line system under ice shedding

Ice shedding from conductors may easily induce electrical and mechanical accidents, which cause serious threat to the safe operation of transmission lines. In this paper, a three dimensional finite element model of tower-conductor-ground wire-insulator system for a 500 kV transmission line was established in ANSYS, and the dynamic responses of ice shedding under different load cases were analyzed for the transmission tower-line system. Newmark method is applied for the solution of the nonlinear transient dynamic analysis. Three variables were considered in the ice-shedding simulating analysis, which includes tower-line coupled effect, phase combination of the ice-shedding conductors as well as thickness of the accreted ice. Influences of all the variables on the dynamic responses of jumping heights, loads at the end of insulators and the forces of transmission tower were mainly studied.