城市地下电缆群载流量预测仿真研究

发布时间：2018-04-20 17:29

本文选题：电缆群 + 载流量　；参考：《计算机仿真》2017年10期

【摘要】：对城市地下电缆群载流量数值的预测计算,能够有效的确定电力电缆在特定环境条件下的载流量。对电缆载流量的预测,需要对电缆的实际工况进行建模,并分析相关的热传递特性,进行迭代计算后得到预测结果。传统方法首先计算电缆不同部位的等效热阻和电缆的总损耗,基于热路计算电缆温升,但对于有多种热传递过程的计算对象预测精度较低。针对城市电网中排管敷设的电力电缆群,从热传导、热对流、热辐射三方面分析了热传递过程,结合一220k V电缆与35k V电缆同排管敷设的实际工况,建立二维温度场和流场有限元模型。利用多层圆筒结构对电缆薄层进行了电参数、热参数的折算,计算了一定条件下的220k V电缆的载流量,给出了电缆群温度场、流场的计算结果,并进一步从土壤导热系数、环境温度、邻近电缆负荷三方面进行了电缆载流量影响因子的定量计算。
[Abstract]:The prediction and calculation of urban underground cable group load can effectively determine the power cable load under specific environmental conditions. It is necessary to model the actual working conditions of the cable and analyze the heat transfer characteristics of the cable. The prediction results are obtained by iterative calculation. The traditional method firstly calculates the equivalent thermal resistance and the total loss of the cable at different parts of the cable. The temperature rise of the cable is calculated based on the hot circuit, but the prediction accuracy for the object with various heat transfer processes is low. In view of the power cable group laid in urban power network, the heat transfer process is analyzed from three aspects: heat conduction, heat convection and thermal radiation. The actual conditions of laying a 220 kV cable and 35 kV cable in the same arrangement are combined. Two dimensional finite element models of temperature field and flow field are established. In this paper, the electric parameters and thermal parameters of the cable thin layer are calculated by using the multilayer cylinder structure. The load current of the 220kV cable under certain conditions is calculated. The results of the temperature field and flow field of the cable group are given, and the thermal conductivity of the cable is further derived from the soil. The environmental temperature and the load of adjacent cables are calculated quantitatively.
【作者单位】：国网上海市电力公司电力科学研究院;上海交通大学;
【分类号】：TM75

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