Influence of Insulator Rupture on Structural Behavior of Power Transmission Tower Under Wind Load

Abstract:

Based on Davenport wind speed spectrum,harmonic superposition method was available to simulate the dynamic wind load. Commercial FEM software ANSYS was employed to analyze the three towers and four-span straight-cup-transmission lines model.Geometric nonlinearity was taken into account in FEM model, structural behavior of the transmission tower was investigated when insulator rupture and wind force 10 loading case happened simultaneously.Analytical results show that after insulator rupture, the stress of the main structural members such as the columns remaining connected with the lines increases by 10%~32%,and the base reaction force increases by 6%～21%.The combined action of wind-load and insulator-rupture can not be neglected in design.