为准确计算架空导线径向截面温度分布，需要确定交流场中导线的各层电流分 布规律． 文中根据钢芯铝绞线的结构特点，以及复合导体磁链之间的耦合规律，推导了架 空导线内部各层导体的自感系数和互感系数，并求得流过每层导体的电流相量值，同时与 数值计算结果进行对比，所得平均误差仅为 3． 56%． 将计算的导体产热率施加到有限元 模型来计算截面温度分布，并通过实验验证了所述方法的准确性． 在此基础上分析了径向 温度分布对载流量计算的影响，发现导体最高允许运行温度的位置结构不同时，可提高的 载流量会有差异，对于线路增容具有借鉴意义． 

In order to calculate the radial temperature distribution of overhead transmission lines accurately，it is necessary to determine the current distribution firstly in alternating field． In this paper，the self-inductance and mutual inductance of the conductor in the overhead conductor WEＲE deduced，and the current phasor value of each conductor was obtained on the basis of the structural characteristics of ACSＲ ( Aluminium Conductor Steel Ｒeinforced) and the coupling law between composite conductor fluxes． The average error we got was 3. 56% in comparison with numeraicl results． To get the cross-section temperature，we put heat generation rate on the finite element model． The accuracy of the method was verified by strict experiments in accordance with which the influence of the radial temperature distribution on the calculation of the current carrying capacity was analyzed，which provided a reference for dynamic rating of overhead lines．