以500 kV承德—平安城双回输电线路工程和±660 kV宁东—山东直流输电线路工程为例，对耐张塔45°风荷载进行了计算，并与其他角度的风荷载进行了比较。分析了各种塔型在计入45°风荷载作用后，相对90°风荷载工况下铁塔塔腿内力的增加量以及对塔体质量的影响，提出了在超高压线路耐张塔设计中把45°风荷载作为非必要工况来进行考虑的建议。

Taking Chengde-Pingancheng 500 kV double-circuit line project and Ningdong-Shandong ±660kV DC power transmission line project as examples, in this paper, the 45° wind load on tension towers is calculated and the wind loads in different angles are compared. The internal force increase of tower legs and the influence on tower weight under 45° wind conditions are also analyzed, based on the comparison with 90° wind conditions. It was suggested that 45° wind should be considered as unnecessary condition for the design of tension tower of EHV transmission lines.