Numerical analysis of the dynamic effects of shock-load-induced ice shedding on overhead ground wires

A numerical model using nonlinear finite element analysis is proposed to calculate the dynamic effects of ice shedding induced by a pulse-type excitation on a single-span overhead line section. The excitation simulates the effect of an external load intended to remove the accreted ice from the cable. Several ice-shedding scenarios are studied with variables including span length and pulse-load characteristics. Different pulse-load characteristics are represented by the variation of their time histories while their amplitude is kept constant. This model serves as a basis to study various failure criteria of atmospheric glaze ice in terms of stress–strain relations and strain-rate effects. The failure criteria defined for glaze ice incorporate both axial and bending effects.