Liu Hezhi

The comparison of conductor stress calculation methods for overhead line under extreme weather conditions

Because of extreme natural disasters, the stress of transmission lines could fluctuate obviously, so its important to calculate the conductor tension in the design or operation of power grid and the analysis of post-failure. Firstly, three common calculation methods for mechanical stress of overhead transmission lines are introduced. Then, the advantages and defects of different calculation methods are analyzed by simulating results analysis of accuracy and the computing time of each method, and researchers and technicians can choose an appropriate calculation method based on the analysis.

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 wires stress beyond the tensile strength. Simulation result shows that the method is valid.