Overhead line icing will seriously affect the safety of power grid. Accurately predicting the ice thickness on power lines is a persistent research problem. Accurate prediction is essential for the anti-icing/de-icing measures of power grid and prevention of serious ice accidents. Based on fluid mechanics theory, a simulation model for the aerodynamic characteristics of the typical icing section of conductor is established. The influence of wind attack angle, wind speed, ice thickness and section shape on the aerodynamic parameters (lift and drag coefficients) is analysed. Combined mechanics principle and conductors icing characteristics, a calculation model of equivalent ice thickness on transmission lines with a tangent tower is developed. The tension and inclination angle of insulator suspension point to tangent tower, as well as the ice and wind load characteristics are considered. Based on the field data from the State Field Scientific Observation and Research Station of Xuefeng Mountain Energy Equipment Security of Chongqing University, it is verified that the results of proposed model strongly agree with the actual measurements. The model can meet the requirements of the engineering applications, with the deviation of all the results less than 10%. The theoretical reference for the design, construction, operation and maintenance of anti-icing and mitigation with power infrastructure can be provided.

架空线路结冰将严重影响电网安全。准确预测电力线上的冰层厚度是一个长期存在的研究问题。准确的预测对于电网的防冰/除冰措施和预防严重冰事故至关重要。基于流体力学理论，建立了导体典型结冰段气动特性的仿真模型。分析了风攻角、风速、冰层厚度和断面形状对气动参数（升力和阻力系数）的影响。结合力学原理和导体结冰特性，建立了带切线塔的输电线路等效结冰厚度计算模型。绝缘子悬垂点对切线塔的张力和倾角，以及冰和风荷载特性被考虑在内。基于重庆大学雪峰山能源装备保障国家野外科学观测研究站的野外数据，验证了所提出的模型结果与实际测量结果高度吻合。该模型能够满足工程应用的要求，所有结果的偏差小于10%。可为电力基础设施防冰减灾的设计、施工、运维提供理论参考。经验证，所提出模型的结果与实际测量结果高度吻合。该模型能够满足工程应用的要求，所有结果的偏差小于10%。可为电力基础设施防冰减灾的设计、施工、运维提供理论参考。经验证，所提出模型的结果与实际测量结果高度吻合。该模型能够满足工程应用的要求，所有结果的偏差小于10%。可为电力基础设施防冰减灾的设计、施工、运维提供理论参考。