架空输电线路运行载流量分析

热平衡方程的反复求解是动态热定值(dynamic thermal rating，DTR)系统中的关键问题，如何选择热平衡方程的模型、估计热平衡方程中的参数以及解算热平衡方程，是体现DTR系统实效性的一个关键。文章首先分析了影响导体热平衡的4个因素，并对两种求解方法进行了比较；在此基础上对输电线路的稳态和动态载流量进行了分析和讨论，展望了该领域深入研究的前景；最后提出了DTR条件下电热协调的思想。

Analysis on Current Carrying Capacity of Overhead Lines Being Operated

Repeating calculation of the heat balance equation(HBE) is the key problem in dynamic thermal rating(DTR) system,how to choose the model for HBE,estimate the parameters in HBE and solve it become a critical problem to incarnate the effectiveness of DTR system.Firstly,four factors impacting the heat balance of conductors are analyzed and two representative solution methods are compared;then on this basis,current carrying capacity of transmission line in the standpoints of steady and dynamic states is discussed and the in-depth research in this field is prospected;finally,the thinking of electro-thermal coordination under the conditions of DTR is proposed.