考虑轴向散热的10 kV三芯电缆中间接头稳态热路模型分析  

A Steady State Thermal Circuit Model Analysis of the 10 kV 3-Core Cable Joint Considering Axial Heat Dissipation

作　　者：李新海 陈昱 刘均裕 王学宗 LI Xinhai;CHEN Yu;LIU Junyu;WANG Xuezong(Guangdong Zhongshan Power Supply Bureau of China Southern Power Grid Co.,Ltd.,Zhongshan 528401,Guangdong,China;China Electric Power Research Institute,Wuhan 430074,Hubei,China;School of Electrical Engineering and Automation,Wuhan University,Wuhan 430072,Hubei,China)

机构地区：[1]南方电网有限责任公司广东中山供电局,广东中山528401 [2]中国电力科学研究院有限公司,湖北武汉430074 [3]武汉大学电气与自动化学院,湖北武汉430072

出　　处：《电网与清洁能源》2023年第10期56-62,69,共8页Power System and Clean Energy

基　　金：智能电网联合基金项目(U2066217);中国南方电网有限责任公司科技项目(GDKJXM20220135)~~。

摘　　要：电缆接头线芯温度计算是实现电缆载流量预测重要环节。该文通过三芯电缆接头结构分析其散热路径,进一步考虑了电缆接头的轴向散热,提出了改进的热路模型。以10 kV三芯电缆中间接头为例开展有限元温度场计算,并根据温度-热源的响应实现稳态热路模型的参数辨识。同时,分析了不同电缆电流以及环境散热条件下稳态热路模型的等效性,与有限元仿真结果吻合良好。该模型可以有效提高电缆接头热点计算的效率。The calculation of the core temperature of the cable joint is an important part of the cable current carrying capacity prediction.In this paper,the heat dissipation path of the three core cable joint is analyzed according to the joint structure.Furthermore,an improved heat path model considering the axial heat dissipation is proposed.Taking the middle joint of the 10 kV three core cable as an example,the finite element temperature field calculation is carried out,and the parameter identification of the steady-state thermal circuit model is realized according to the temperature response.The equivalence of the steady-state thermal circuit model under different cable currents and environmental heat dissipation conditions is analyzed,which is found to be in good agreement with the finite element simulation results.The model can effectively improve the efficiency of hot spot calculation of cable joints.

关 键 词：三芯电缆接头 有限元仿真 轴向散热 稳态温度场 等效热路模型 

分 类 号：TM75[电气工程—电力系统及自动化]