Numerical simulation of ice accretion and ice-shedding on a long-span transmission tower-line

Ice-shedding from overhead transmission lines will result in the dynamic impact effects on the conductors and shield wires. Finite Element method is employed to construct the tower-line model and simulate the phenomena of ice accreting and ice-shedding. Then the ice accretion and ice-shedding were simulated with the density changing method and the dynamic impact of the tower-line due to ice-shedding are obtained. The parametric study and the unzipping effect are also investigated. Results show that the ice accretion on the shield wire is more significant than on the conductor and the displacement amplitude of the conductor is larger than that of the shield wire. The maximum jump height of conductor increases first and then decreases with the shedding ratio, and reaches the maximum value when the shedding rate is 50%. The maximum jump height of conductor increases with the increase of shedding velocity.