基于有限元算法的电缆动态流量计算方法研究

Research on Cable Current-Carrying Capacity Calculation Method Based on Finite Element Method

电缆载流量是电缆运行中受环境条件和负荷影响的重要动态运行参数,是输电线路运行经济性和安全性的重要保障。然而,电力电缆因其自身结构特点和运行工况的复杂性,造成了计算电缆载流量的困难。采用高效精确的有限元法来计算电缆载流量,将电缆和敷设环境的截面进行单元划分,将电缆载流量计算转化为对单元顶点温度求极值的问题。采用有限元算法来计算电缆载流量,在保证计算速度满足工程应用要求的同时,提高了计算精度。

Cable current-carrying capacity is an important dynamic operating parameter influenced by environmental conditions and loads.It is an important guarantee of transmission line operation economy and safety.However,it is difficult to calculate the current-carrying capacity of power cables due to the complexity of structure and operating conditions.This paper adopts the efficient and accurate finite element method to calculate the cable current-carrying capacity.The calculate method divides the section of the cable and the laying environment into units,and the cable current-carrying capacity calculation problem is converted into the unit peak temperature extremum problems.The finite element method is used to calculate the cable current-carrying capacity,which not only ensures the calculation speed to meet the requirements of engineering applications,but also improves the calculation accuracy.