AEOLIAN VIBRATION CHARACTERISTICS AND WIND POWER INPUT OF LARGE SECTION BUNDLED CONDUCTORS OF UHV LINES

摘要

Aeolian vibration may cause fatigue damage to overhead electric conductors, which threats the mechanical safety of power transmission lines. Most of previous experimental and numerical studies on aeolian vibration are related to single conductors, while few researches address the large section bundled conductors, which are widely used in Ultra High Voltage (UHV) transmission lines. Thus, this paper is an attempt to investigate the dynamic characteristics of bundled conductors during aeolian vibration, by computational fluid dynamics (CFD) method. First, the aeolian vibration model of a single conductor was established, and the simulated results were compared with results from wind tunnel tests, to validate the numerical simulation method. Then, in the aeolian vibration model bundled conductors were simulated following the same method, where the fluid-structure interaction effect and the wake flow effect between different sub-conductors were considered. Also, the influence of horizontal spaces between sub-conductors on the vibration characteristics of bundled conductors was studied. Finally, the wind power input curve of bundled conductors was obtained, which is a key parameter for anti-vibration design of transmission lines. The conclusions of this study are useful in ensuring the mechanical security of UHV transmission lines and improving the anti-vibration countermeasures.