Jump height of an iced transmission conductor considering joint action of ice-shedding and wind

Ice shedding from conductors may cause a significant vertical vibration of a transmission line, which may lead to interphase flashover and thereby endanger power transmission. To design a reasonable electric insulation clearance, it requires an accurate estimation of the largest jump height of a conductor following ice shedding, which might be affected by wind actions. This study investigates the coupling effects of wind action and ice shedding on the jump height of an iced conductor. Wind tunnel tests were carried out to obtain aerodynamic force coefficients of the iced conductor with crescent sections. The dynamic responses of a practical extra-high voltage (EHV) transmission line subject to joint actions of ice-shedding and wind were analyzed by numerical simulation. The influence of wind actions, accreted ice thickness, and ice shedding rate were investigated and discussed on the largest jump height of conductors. An empirical formula for estimating the largest jump height was proposed considering the ice-wind joint effects. The accuracy and applicability of the proposed formula were validated through experimental and simulation data.