Research on Dynamic Simulation of Power Transmission Line Galloping in Three-Degree-of-Freedom Model

摘要

Galloping of iced conductor is occurred and affected by many complex factors.Upon most occasions,it is not induced by transverse vibration or torsional vibration separately but the coupling effect of the two movements.In this paper,to explore the reasons for the formation of galloping,a single conductor model with three-degree-of-freedom involving both the transverse vibration and torsional vibration is suggested to account for the influences of environmental conditions,geometrical configuration and movement coupling properties.A two-node quadratic beam element in 3-D and a structural mass element are applied to establish the finite element model of iced conductor in ANSYS.To acquire the natural frequency and dynamical response,modal analysis and dynamic transient response calculation are made on the model.According to the calculation results,galloping response curves and frequency characteristic can be confirmed.The simulation results demonstrate the rationality of the iced conductor model and illustrate the coupled motions effect on galloping.