基于电磁-热耦合场的架空输电线路载流量分析与计算

架空输电线路的允许载流量是保证其安全运行的重要参数之一。根据架空输电线路产热和散热的特点,建立了架空导线的磁场-温度场耦合二维有限元分析模型,确定电磁-热耦合场分析的边界条件,求解得到了架空输电导线内部电磁场分布。将得到的焦耳热损耗作为热源耦合至热场模型进行计算,并采用数值迭代法求解得到架空输电导线的允许载流量。此外,基于该仿真模型通过仿真分析得出了不同外部环境因素对架空输电线路载流量的影响规律。该研究成果可以为架空输电线路的热分析和载流量计算提供一定的参考。

Analysis and calculation on the ampacity of overhead transmission lines based on electromagnetic-thermal coupling fields

The ampacity is one of the most important parameters to ensure the safe operation of overhead transmission lines. According to the characteristics of heat generation and dissipation of the overhead transmission lines, a 2D finite element model of overhead electrical conductor considering the coupling of electromagnetic field and thermal field is established. Based on corresponding electromagnetic-thermal boundary conditions, electromagnetic field and temperature field distributions of overhead electrical conductor are obtained and the Joule's loss, as heat source, calculated in electromagnetic field analysis is coupled with temperature field. The numerical iterative method is applied to calculate the ampacity of overhead transmission lines. Moreover, the influence of different environmental factors on ampacity of overhead transmission line is investigated based on this simulation model. The research has some reference significance to the thermal analysis and ampacity calculation of overhead transmission lines.