Abstract
A numerical method to simulate air flow around a bundle conductor line by means of the FLUENT software is presented and verified by a wind tunnel test for aerodynamic characteristics of a twin bundle conductor line. The lift and drag coefficients of the leeward sub-conductor of a twin bundle conductor varying with its relative position in the wake zone to the windward one under different wind velocities are numerically determined by the presented method. A user-defined subroutine of ABAQUS software is developed to apply the aerodynamic loads on each sub-conductor and the electromagnetic force between sub-conductors. The numerical simulation method for wake-induced oscillation of a bundle conductor line is proposed. By means of the numerical method, wake-induced oscillation processes of twin bundle conductor transmission lines under different parameters, including current intensity, spacer layout, span length and wind velocity, are numerically simulated. Moreover, the effects of those parameters on the oscillation characteristics of the lines, such as vibration mode, frequency, amplitude and motion trace, are discussed. The results obtained provide a fundamental basis for the understanding of wake-induced oscillation behaviour of twin bundle conductor transmission lines and the development of control technique for wake-induced oscillation.
Highlights
Bundle conductors are widely used in electric power transmission lines
The wake-induced oscillation behaviour of twin bundle conductor lines under different parameters is numerically investigated and the results may provide a fundamental basis for the development of control techniques
The aerodynamic coefficients of the twin bundle conductor varying with wind attack angle under a wind velocity of 12 m s−1 determined by the numerical simulation and the wind tunnel test are illustrated in figure 5
Summary
Bundle conductors are widely used in electric power transmission lines. Wake-induced oscillations of bundle conductor lines were frequently observed in China recently. Price [8] investigated the lift and drag coefficients of the leeward sub-conductor of twin bundles of smooth and stranded conductors by means of wind tunnel tests and analysed the relation between the aerodynamic coefficients of the leeward conductor and its position in the wake of the windward one under two turbulences and various Reynolds numbers. They obtained the full conditions for wake flutter by the quasi-steady linear flutter theory and the approximated undamped conditions. The wake-induced oscillation behaviour of twin bundle conductor lines under different parameters is numerically investigated and the results may provide a fundamental basis for the development of control techniques
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