Influence of conductor structure and loads on galloping of a transmission line

For profoundly understanding influence of conductor structure forms and aerodynamic torsion loads on dynamic characteristics,galloping law and amplitude of an iced transmission line,a computer program based on nonlinear finite element analysis was developed using ANSYS parametric design language,time history curves were computed.Results indicated that the galloping amplitude of the bundle conductors is obviously greater than that of a single conductor,time needed to enter a steady state of galloping decreases noticeably as more conductors are added;consequently,in the same weather conditions,single conductor and less conductors in bundle should be adopted;aerodynamic torsion loads have slight influence on galloping law and amplitude for in-plane and out-of-plane galloping,but have a greater effect on amplitude of torsion angle;therefore the effect of aerodynamic torsion loads on breaking of an iced transmission line and its towers can be ignored.