Fortran-, Python- and Abaqus-Codes for: Mitigation of conductor line galloping by enhanced damping in composite power pylons

Abstract:
Steel lattice towers with suspended insulator strings are typically used to carry high-voltage overhead transmission lines. The installation of non-conductive power pylons made of glass fibre reinforced plastics enables a direct cable-pylon connection, as the composite structure acts as an unibody insulator.
At the same time, wind-induced vibrations, such as the severe cable vibration phenomenon galloping, will consequently be directly transferred to the slender composite mast structure, potentially leading to extensive damage.
The aim of the study is therefore to investigate the galloping behaviour of iced conductor lines with regard to different cable support conditions. Furthermore, additional damping in the composite power pylon structure is assumed to mitigate conductor line galloping and therefore reduce the risk of phase flash-overs between adjacent conductor lines. A numerical galloping simulation is carried out in order to evaluate the effect of a rigid cable-pylon connection with enhanced damping properties on the cable vibration amplitudes. A pylon-cable system, consisting of 3x300m spans, is investigated.
It was found that the support conditions of the conductor lines have a significant influence on the galloping mode, the vibration amplitudes and the orientation of the characteristic galloping ellipse. The addition of damping to the pylon decreases the vibration amplitudes slightly and leads to a re-orientation of the galloping ellipse.

All the data of the numerical FE-simulation are uploaded in order to reproduce the models or apply for different simulations.

摘要：
搭载悬垂绝缘子串的钢格构塔通常用于架设高压架空输电线路。采用玻璃纤维增强塑料（Glass Fibre Reinforced Plastics, GFRP）制成的非导电输电铁塔，可实现导线与铁塔的直接连接，因其复合结构可作为一体式绝缘子使用。
与此同时，诸如严重的导线舞动现象这类风致振动，将直接传递至细长复合桅杆结构中，可能引发大面积结构损伤。
因此，本研究旨在针对不同导线支撑条件，探究覆冰导线的舞动特性。此外，本研究假设可通过在复合输电铁塔结构中增设附加阻尼，抑制导线舞动，进而降低相邻导线间发生相间闪络的风险。为评估增强阻尼特性的刚性塔缆连接对导线振动幅值的影响，本研究开展了舞动数值模拟。本次研究对象为包含3×300米档距的塔缆系统。
研究结果表明，导线的支撑条件对舞动模式、振动幅值以及特征舞动椭圆的取向具有显著影响。为铁塔增设阻尼可小幅降低振动幅值，并使舞动椭圆的取向发生改变。
本研究已上传所有有限元（Finite Element, FE）数值模拟数据，以供模型复现或开展不同类型的模拟研究使用。