Numerical simulation and parameter analysis of galloping for iced quad-bundled conductor

he aerodynamic characteristics of iced sub-conductors is different from each other due to the wake interference of the sub-conductors in an iced bundled conductor. The aerodynamic coefficients of iced quad-bundled conductor varying with attack angle, which are the necessary data for numerical simulation of galloping for the conductor, were determined by means of wind tunnel test. A cable element with torsional degree used to simulate the iced conductor is obtained in ABAQUS software by releasing the bending degrees-of-freedom of spatial beam element and setting the material to be incompressible. The aerodynamic loads varying with attack angle are applied on the cable elements through the introduction of user defined element. It is illustrated that the galloping amplitude of the iced conductor as the wake interference is taken into account is obviously larger than those as wake interference is ignored. Furthermore, the effects of parameters such as wind speed, ice thickness and span length on the galloping for the quad-bundled conductor are numerically investigated, which provides a theoretical foundation for the development of the anti-galloping technology.