ON GALLOPING OF BUNDLED CONDUCTORS IN AN OVERHEAD TRANSMISSION LINE WITH LARGE TORSIONAL MOTION

The galloping phenomenon of bundled conductors in an overhead transmission line is complicated by the interaction between the large amplitude vibration of the conductors and the geometrically nonlinear, time-dependent aerodynamic loads.For bundled transmission for of long span, the galloping phenomenon is characterized by large amplitude, low frequency vibration with large global torsional motion Non-linear geometric constraints and non-linear gravitational moments are present as a result of the spacers and galloping control devices. In this paper, a basic dynamic equation for bundled transmission lines in a global coordinate system is developed on the basis of virtual work principle. The non-linear dynamics of spacers and galloping control devices are investigated. A galloping model for dynamic configurations of bundled transmission lines is obtained.The present results lay down the foundation for further Study of the problem.