架空输电线路温度和最大允许载流量计算

摘要

In allusion to the shortcoming of traditional method which can’t effectively solve the temperature of overhead transmission line and the allowable load flow, a method based on finite element technique is proposed to solve the radial temperature and the maximum allowable load flow of the transmission line. A transmission line temperature field mathematical model and a finite element model of type-JL/LB1A-300/50 aluminum conductor steel reinforced conductor is established, and simulated by ANSYS software under different environmental conditions, which verified that radial temperature difference exists in transmission line, and the radial temperature distribution is influenced by the current-carrying capacity, air convection, light intensity and wind speed etc. The results show that this method can effectively obtain the radial temperature values and allowable load flow of the transmission line in different weather conditions, It is advantageous to improve the safety and stabilityof transmission line, realize the dynamic capacity increase of transmission line and improve the transmission capacity of transmission line.%针对传统方法不能有效求解架空输电线路温度和允许载流量的不足，提出了一种基于有限元技术求解输电导线径向温度和最大允许载流量的方法。建立了输电导线温度场的数学模型和JL/LB1A-300/50型钢芯铝绞线输电导线有限元模型，并通过有限元ANSYS软件对该模型在不同环境条件下进行仿真计算，验证了输电导线存在径向温度差，以及径向温度分布受输电线路载流量、空气对流散热、光照强度以及风速等条件的共同影响。结果表明：该方法能够有效求得在不同气象环境条件下输电导线的径向温度值和最大允许载流量，有利于提高输电线路运行安全稳定性，实现输电线路动态增容，提高线路输电能力。