Wind-structure interaction in conductor bundles in transmission lines

摘要

The use of transmission line conductors arranged in bundles is presently being considered as an attractive technology in order to reduce losses in long distance energy transportation. Although the technology leads to significant increases in power capacity per line, the dynamic behaviour of arbitrary bundle configurations under wind action has not yet been fully clarified. In this paper, a procedure to determine the dynamic response of the bundle under operating conditions is presented. The model considers the fluctuations of the incident turbulent wind flow and the motion of the conductors, as some cables may be immersed in the variable wake of others. A solution is obtained by numerical integration in the time domain of the equations of motion of a discrete non-linear model of the bundle, which includes criteria to assess the forces on spacers and cables by means of aerodynamic coefficients obtained experimentally in wind tunnel studies. The predicted response of a three-conductor bundle is compared with experimental results available in the technical literature. Results of simulation studies of various bundle configurations subjected to turbulent wind action are also given.