抗冰过载保护金具对输电线路的影响分析

针对抗冰过载保护金具生效后对输电线路的影响，以SZ1双回直线塔为例，建立三塔四线的有限元模型。采用非线性有限元找形方法找形，分析塔线体系在均匀覆冰、不均匀覆冰下铁塔的极限承载力，确定塔线分离控制荷载。结果表明，抗冰过载保护金具生效时导线脱落引起的冲击力，可使相邻杆塔和本塔预安装的抗冰过载保护金具生效，使导线脱落完成卸载，起到了保护铁塔的作用。

Impact Analysis of Anti icing Overload Line Fittings on Transmission Lines

Taking SZ1 double circuit tangent towers for an example, in view of the anti icing overload line fitting impact on the transmission lines, the finite element model of tower transmission lines system is established. A form finding method is proposed by using nonlinear finite element method. The ultimate load capacity of the transmission tower is calculated under the conditions of uniform icing and non uniform icing. And then load of controlling tower transmission line separation is determined. The calculation results show that when the anti icing overload line fittings become effective, the impact force caused by the wire loss can make the anti icing overload line fittings of adjacent tower pre installed effect so that the wire is dropped and the unloading is completed, which protects the steel towers.