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为了准确有效研究大跨越输电塔-线体系中杆塔结构在覆冰断线工况下的动力响应,以晋东南-南阳-荆门1 000 kV特高压输变电工程中的黄河大跨越段为原型,进行了模拟覆冰条件下五塔四线塔-线体系模型的断线冲击响应试验。试验测得了输电塔薄弱位置杆件的应变时程曲线,研究了塔-线体系在不同断线工况下杆塔的动力响应。通过分析得出了输电杆塔的最不利断线工况,找出了输电塔在断线冲击作用下的最不利位置,为输电塔结构抗冰灾设计提供了有价值的参考。通过进一步研究发现,当断线位置在导、地线悬挂点附近时,输电塔的测点应变突变值与覆冰厚度成近似的一元二次函数关系。
In order to accurately and effectively study the dynamic response of the tower structure in a large span transmission line-tower system under icing-off conditions, a prototype of the Yellow River span in the Jindongnan-Nanyang-Jingmen 1 000 kV UHV power transmission project was taken as a prototype , The simulation experiment of ice breakage of five-tower four-wire tower-line system under simulated icing condition was carried out. The strain history curve of the bar at the weak position of the transmission tower was measured and the dynamic response of the tower under different breakage conditions was studied. Through the analysis, the most unfavorable disconnection condition of power transmission tower is found, and the most unfavorable position of transmission tower under disconnection impact is found out, which provides a valuable reference for the design of anti-icing transmission structure of power transmission tower. Through further research, it is found that when the position of the broken wire is near the guidance point and the suspension point of the earth line, the sudden change of the measured point strain of the transmission tower and the thickness of the ice coating become approximate quadratic function.