RESEARCH ON PARAMETER ANALYSIS AND DESIGN OF TRANSMISSION LINE-ANTI-GALLOPING DAMPER SYSTEM

In view of the current frequent occurrence of iced conductors galloping, a method for suppressing galloping of transmission lines is proposed, which is achieved by installing dampers at a position where the conductor is close to the transmission tower to reduce vibration and increase energy consumption. Based on the Hamilton principle, the generalized motion equation of the conductor-damper system is derived using multi-order Galerkin functions. Taking a 750 kV single-span 8-bundled transmission line as an example, the eigenvalue analysis of the motion equation is carried out, and the dynamic characteristics of conductor-damper system are obtained. The influence of conductor sag parameters, damper installation position, damping coefficient and stiffness coefficient on the equivalent damping ratio of the system is explored. The closer the installation position of the damper to the middle of the span, the more obvious the improvement effect of the maximum damping ratio of the system; and the symmetrical installation of the damper can effectively reduce the optimal damping coefficient. Numerical examples and finite element numerical simulations are used to compare the vibration damping effects between traditional viscous dampers and negative stiffness dampers (NSD) on the conductor system, and a parameter optimization design method is proposed for NSD. Research shows that, compared with traditional viscous dampers, NSD can effectively increase each order’s maximum damping ratio of the system at a lower damping coefficient, and significantly reduce the natural frequency of the system as well. The maximum first-order damping ratio is not sensitive to the change of the installation position of NSD. The finite element simulation proves that the NSD has better anti-galloping performance than traditional viscous damper schemes.