Ice-shedding jump height of uneven iced sub-conductors under varying wind load conditions

Significant vertical displacement caused by ice shedding from conductors may increase the risk of electrical accidents such as flashover. Ice shedding often occurs with joint actions of wind, which affects the jump height of transmission lines. The shielding effect of bundled conductors leads to uneven ice accretion among sub-conductors, resulting in variations in the wind attack angle along the transmission line, which significantly influences on the wind load on the conductor. This paper firstly established a finite element model of a practical iced transmission line for dynamic response analysis of ice shedding. To accurately determine the wind load on bundled conductors, the aerodynamic force coefficients of the conductors were updated in real-time by extracting the torsion angle response. Parametric analysis was also conducted in detail to investigate the impact of uneven ice accretion among sub-conductors, ice thickness, and wind velocity on the iced-shedding jump height of the transmission line.