Oscillation of conductors following ice-shedding on UHV transmission lines

Ice-shedding on a UHV overhead transmission line was simulated by releasing lumped loads from it. The resulting oscillations were compared with those from a simulation program for a multi-span line. The damping parameter in the simulation program was adjusted until the jump heights and oscillation attenuation obtained from the program and the physical test agreed. Using this damping parameter, the behavior of a UHV transmission line was evaluated by the program for various values of span length, number of spans per line section, insulator length as well as the effect of the ‘unzipping’ mode of ice shedding.

► The ice shedding from a full-scale transmission line was simulated by lumped loads.
► The damping parameter was obtained from a full-scale transmission line.
► Good agreement between the numerical computation and test results was obtained.
► Ice-shedding was evaluated by the program for various influencing parameter.