为了克服架空线路载流量计算时将太阳辐射强度视为定值的缺陷，充分挖掘导线潜在的输送能力，首先以100W/m² 的太阳辐射强度为梯度，讨论了太阳辐射强度取值对不同截面导线载流量计算的影响; 然后，基于大气对太阳辐射的衰减规律，引入辐射衰减系数，建立太阳辐射强度的实时计算模型，该模型可根据不同地区的经纬度以及具体时刻，将太阳辐射强度的计算转化为太阳射线穿过大气层厚度的计算，达到评估某地区实时太阳辐射强度的目的; 最后，结合山西大同地区2012 年的气象监测数据和IEEE 738—2006 提供的方法，对所提模型的准确性进行了检验，发现模型计算的太阳辐射强度与实际测量值基本吻合，最大误差在70 W/m² 以内，且文中方法比IEEE 方法更接近监测数据，更能满足架空线路载流量计算的要求．

In order to explore the potential transmission capacity and overcome the defect that solar radiation intensity is regarded as a constant when the transmission capacity of overhead conductors is calculated,by adopting a solar radiation intensity gradient of 100W/m²,the influence of the solar radiation intensity on the transmission capacity of overhead conductors of different kinds of cross-sectional areas is discussed.Then,on the basis of the atmospheric attenuation law of solar radiation and by introducing an attenuation coefficient,a real-time solar radiation evaluation model is constructed.In the model,according to specific time and the longitudes and latitudes of different regions,the problem is converted into another problem of calculating the distance of the solar radiation getting through the atmosphere,thus realizing the purpose of evaluating the real-time solar radiation intensity of a region.Finally,by using the meteorological data of Datong,Shanxi Province in 2012 and the data calculated by the formulas of IEEE 738—2006,the accuracy of the constructed model is verified.It is found that the data calculated by this model can fit the meteorological data well,with a maximum error within 70W/m²,and the fit is better than the data calculated by the formulas of IEEE 738—2006,which means that this model can meet the requirements of calculating the transmission capacity of overhead conductors.