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500kV输电线路铁塔及塔-线体系的模态分析
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摘要
输电线路铁塔及塔-线体系的动力特性分析对杆塔设计、线路特性分析及舞动分析计算都很重要。以500kV交流高压双回路输电线路为研究对象,分别建立了直线塔和耐张塔的杆梁混合单元有限元几何模型,较全面地分析了高压直线塔和耐张塔的动力学特性。对于塔-线耦合体系,使用悬链线法对导线和地线进行几何找形,对绝缘子和辅助零件进行合理简化,通过构建合理的耦合关系及边界条件建立了500kV交流双回路三塔四档塔-线耦合体系的有限元模型,并进行了动力学特性分析;获得了整个体系的前1000阶固有频率及模态振型,选出了16个典型的固有频率和模态振型,并与两个单塔的分析结果进行了对比。
The dynamics analysis of tower and tower-line system on Transmission is important for tower design,analysis of line characteristic and conductor galloping. The finite element models,including a strain tower and a tangent tower are created with the research object of 500 kV transmission line. Comprehensively analyzes the dynamic characteristics of strain tower and tangent tower. For tower-line coupling system which has three towers and four gaps,calculate the geometric shape of the wire using catenary method. The insulator and auxiliary parts are made reasonable simplification. And established a transmission tower-line coupling system finite element model by building reasonable coupling relationship and the boundary conditions. Do dynamics analysis of tower-line coupling system. Obtain the first 1000 order natural frequency and modal vibration mode of the tower-line system model. And chose 16 typical natural frequencies and modal vibration mode,and have a comparative analysis between the single tower's analysis results and the tower-line coupling system's analysis results.
引文
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