Stress calculation method for overhead line conductors under ice overload condition considering material plasticity

Wire behaves plastically in its elastic range. Without considering the wire plastic deformation, the calculation results of wire stress in overload condition will be conservative. So this paper established the state equation of stress changes based on wire strain curves when the wire is ice overloaded and the produced stress exceeds the limit. Considering the wire strain curves, a new calculating method of the stress was introduced when the wire´s stress beyond the tensile strength. Simulation result shows that the method is valid.