为了更快速、准确地分析覆冰分裂导线的断线工况，本文基于Co-rotational法开发了梁、杆单元的有限元模型。提出了“节点失效”的断线有限元实现方法，并与实验对比验证了方法的可靠性。随后通过C++语言编写了该有限元程序，通过QT以及VTK工具包实现了程序的可视化。最后建立了三档覆冰四分裂有限元模型，针对该有限元模型研究了不同覆冰厚度、不同断线位置对子导线的张力及对间隔棒弯矩的影响。结果表明：间隔棒在子导线断裂时承受额外力矩，并且未断导线在间隔棒附近出现最大张力值，该张力沿导线向远离断点位置递减至正常运行水平。在覆冰情况下，单子导线和双子导线的断线最大张力都与覆冰厚度呈线性增加；三根子导线断裂时，将导致所有子导线断裂；而当四根子导线全部断裂时，可以简化为单导线的计算。本文模拟结果可为输电线路设计和故障分析提供参考，提出的断线模拟方法可为导线断线的仿真提供了一种可靠的有限元实现方法。
Abstract
In order to analyze the disconnection conditions of ice-covered split wires more quickly and accurately, this paper developed a finite element model of beam and rod elements based on the co-rotational method. A finite element implementation method for disconnection of "node failure" was proposed, and the reliability of the method was verified by comparison with experiments. The finite element program was then written in C++ language, and the program was visualized through QT and VTK toolkits. Finally, a three-level ice-coated four-split finite element model was established. Based on this finite element model, the effects of different ice coating thicknesses and different disconnection positions on the tension of the sub-conductors and the bending moment of the spacer rods were studied. The results show that the spacer rod bears additional torque when the sub-conductor breaks, and the maximum tension value of the unbroken conductor occurs near the spacer rod, and the tension decreases along the conductor away from the break point to the normal operating level. In the case of ice coating, the maximum tension of single sub-conductor and twin sub-conductors increases linearly with the ice coating thickness; when three sub-conductors break, all sub-conductors will break; and when all four sub-conductors break, it can be simplified to single sub-conductor. Calculation of conductors. The simulation results in this paper can provide a reference for transmission line design and fault analysis. The proposed wire breakage simulation method can provide a reliable finite element implementation method for the simulation of wire breakage.
关键词
四分裂导线 /
导线断线 /
覆冰导线 /
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Key words
quad bundle conductors /
broken conductor /
iced-conductor;
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