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1000kV特高压输电塔线体系风荷载传递机制风洞试验研究

, PP. 109-116

Keywords: 特高压输电线路,1000kV耦联效应,输电塔线体系,光纤布拉格光栅传感器,风洞试验,荷载传递机制

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Abstract:

为研究输电塔线体系的风荷载传递机制,以皖电东送淮南—上海输变电工程1?000?kV特高压送电线路中的直线钢管塔为设计原型,在同济大学TJ-3风洞试验室进行了输电塔–八分裂导线五塔四线耦联体系完全气弹模型风洞试验,测得了体系的加速度和位移响应。采用光纤布拉格光栅(fiberBragggrating,FBG)传感器,测得了塔身主材、导线及绝缘子在风荷载作用下的动应变。通过对不同风攻角、流场及风速工况下塔线体系动力响应数据的统计与分析,总结出了导线、绝缘子和输电塔风致振动规律;通过功率谱密度分析,揭示了输电塔线耦联体系的风荷载传递机制。研究结果表明,塔线体系风致振动呈现强非线性耦合作用,导线及绝缘子的振动对输电塔具有重要影响,随着风速的增加,导线高阶振型对能量的贡献增大。

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