110kV单芯海缆的载流量计算、温度场仿真及其热循环试验研究

Ampacity Calculation, Temperature Simulation and Thermal Cycling Experiment for 110 kV Submarine Cable

由于海底电力电缆独有的结构特性和复杂的敷设环境,其载流量一直是研究的难点。为了深入研究海底电缆的电热特性及其载流量,利用3种方法对典型海缆的载流量进行计算。分析了海底电缆特有的铅包层和铠装层损耗,引出热阻和载流量的计算方法。以型号HJQF41 64/110 k V 1×500的典型海缆为研究对象,对其不同敷设条件、不同环境温度下的载流量进行理论计算。基于有限元分析法,利用Comsol软件对该海缆的温度场进行仿真。设计岸滩环境下海缆热循环试验系统,对被试海缆样品进行载流量试验研究。证实了3种方法对海缆载流量研究的可行性,比较了各种方法的利弊,为海缆运营单位和科研机构提供了参考。

Due to the unique structure of submarine power cable and its complex laying environment, its ampacity is of difficulty in study. To investigate the electro-thermal properties and the ampacity of the submarine cable, this study used three methods to analyze and calculate the ampacity of typical submarine cable. The losses of the armor and lead sheath, which are specially for submarine cable, were analyzed,and the methods for calculating the thermal coefficient and ampacity were provided. Taking the typical HJQF41 64/110 k V 1×500 submarine cable for example, its ampacity under different laying conditions and ambient temperatures was calculated. Moreover, the finite element analysis software Comsol was adopted to simulate the temperature field of the cable, and a thermal cycling test system with beach environment was designed to test the ampacity of the submarine cable. The three methods were compared in their performances, and they were demonstrated to be feasible for investigating ampacity of submarine cable.