Numerical Analysis of Two-bundled Conductor Aeolian Vibrations with Spacer Dampers

Spacer dampers are attached on the bundled conductors to suppress aeolian vibrations for many decades. In present study a new aeolian excitation induced by shed vortex had been derived base on wind power equivalent principle; the spatial distribution and the wind power input can be considered. The two-bundled conductor with spacer dampers attached is simplified to the mass-spring-dampers modle; dynamic equation could be obtained by dpsila Alembertpsilas principle. The fourth-order finite difference scheme is derived to predict the vertical; steady-state; monofrequent aeolian vibration of bundled conductor with or without spacer dampers, and the displacement amplitude and dynamic bending strain of conductor could be obtained by using the iterative methods. Take 220 kV two-bundled conductor as an example; the conductor with and without spacer dampers were computed by energy balance method and present model respectively. Results prove that spacers can restrain conductor aeolian vibration by means of choosing appropriate clamp damping and stiffness and the effect of interaction between two sub-conductors can be taking into account by present method.