基于有限元对220kV三芯海缆温度场的数值计算

Numerical Calculation of Temperature Field of 220kV Three-Core Submarine Cable Based on Finite Element Method

近年来,随着近海风电场的数量不断增加,海底电缆进一步向大容量、低损耗的方向发展。2016年,江苏响水近海风电场已经投运一条220 kV三芯光纤复合海缆。目前,国内外学者对单芯电缆的载流量和温度场等进行了充分的研究,但对超高压三芯电缆的研究比较少。利用COMSOL Multiphysics对三芯光纤复合海底电缆的温度场进行数值计算,并分析了环境温度和海缆周围介质热阻对三芯海缆温度场的影响。结论是:环境温度每升高3 ℃,海缆内部的温度也相应增加4 ℃;土壤热阻每增加0.2 k·m/W,海缆线芯温度升高约为11 ℃,外被层温度升高约为9 ℃.这些影响为三芯电缆的设计以及海缆路由的选择提供了参考.

In recent years,with the increasing number of offshore wind farms,the submarine cables are further developed in the direction of large capacity and low loss.A 220kV three-core fiber composite cable has been put into operation in the offshore wind farm in Jiangsu,2016.At present,domestic and foreign scholars have conducted sufficient research on the load flow and temperature field of single core cable,but less research on the three core cables.In this paper,the temperature field of three-core fiber composite submarine cable is calculated by COMSOL Multiphysics.The influence of the ambient temperature and the thermal resistance of the media on the temperature field of the three-core cable is analyzed.Draw a conclusion:the temperature of the environment increases by 3 degrees,and the internal temperature of the cable is increased by 4.Soil thermal resistance increase 0.2 K·m/W,submarine cable wire core temperature of about 11 ℃,outer layer temperature of about 9 ℃.These influences provide reference for the design of three-core cable and the selection of cable routing.