多回路输电线路转角塔荷载计算探讨

Discussion on the Calculation of the Load of the Corner Tower of the Multi-Circuit Transmission Line

目前多回路输电线路转角塔不同层导地线风压荷载的计算高度均按各层实际高度取值,但对不同层导地线张力荷载计算时,却统一取下层导线平均高,这种计算方法对于多回路塔头尺寸较大杆塔计算偏差较大。本文基于架空输电线路荷载规范,提出了转角塔导地线风压和张力荷载按照各层导地线实际高度、风与导地线的实际角度进行计算的理论方法及其参数取值,并进行算例分析。结果表明,按本文计算方法测算500 kV双回路小角度杆塔塔重增加约0.8%,大角度杆塔塔重减少约5.8%,杆塔横担位置的材料规格会普遍增大1~2个规格。本文所提出的思路和方法,可为设计人员计算多回路输电线路转角塔荷载时提供参考。

At present,the calculated height of the wind pressure load of the ground conductor of different layers of the corner tower of the multi-circuit transmission line is taken according to the actual height of each layer,but when the tension load of the conductor of different layers is calculated,the average height of the conductor of the lower layer is uniformly taken,and this calculation method is larger for the calculation deviation of the tower with the larger size of the multi-loop tower head.Based on the load specification of overhead transmission lines,this paper proposes a theoretical method and parameter values for calculating the wind pressure and tension load of the ground conductor of the corner tower according to the actual height of the ground conductor of each layer and the actual angle between the wind and the ground conductor,and analyzes the examples.The results show that according to the calculation method in this paper,the weight of the 500 kV double-loop small-angle tower increases by about 0.8%,and the weight of the large-angle tower decreases by about 5.8%,and the material specification of the tower cross-arm position will generally increase by 1~2 specifications.The ideas and methods proposed in this paper can be used as a reference for designers to calculate the load of corner towers of multi-circuit transmission lines.