单芯电缆线芯温度的非线性有限元法实时计算  

Real-Time Core Temperature Calculation of Single-Core Cable by Nonlinear Finite Element Method

作　　者：雷鸣[1] 刘刚[1] 邱景生[1] 赖育庭[1] 刘毅刚[2] 简淦杨[1] 

机构地区：[1]华南理工大学电力学院,广东省广州市510640 [2]广东电网公司广州供电局,广东省广州市510310

出　　处：《电网技术》2011年第11期163-168,共6页Power System Technology

基　　金：基金项目:国家重点基础研究发展计划项目(973项目)(2009CB724507)~~

摘　　要：考虑电缆材料热性参数是温度的函数及忽略热量沿着线芯轴向传输所造成的线芯温度计算误差,为提高电缆线芯温度计算的精度,提出基于非线性有限单元法计算电缆导体的温度。研究电缆导体径向、轴向温度梯度以及热量扩散规律,分析运行电流、外界环境温度等因素对电缆线芯轴向、径向温度分布的影响。根据传热学原理,研究电缆热性参数随温度变化对电缆导体温度的影响,建立电缆导体温度计算三维非线性有限元模型,并通过实验数据对非线性有限元模型进行验证和修正。实验和有限元仿真的对比表明:忽略电缆热量沿着轴向传输以及热性参数的改变会造成线芯温度计算误差;所提出的电缆导体温度实时计算非线性有限元模型的有效性,为高温下运行电缆导体温度监测与负荷预测奠定了基础。In IEC 60287-based computing models of cable core temperature, thermal parameters of cable materials are considered as functions of temperature and there is computational error of core temperature due to neglecting the transmission of heat along axial direction of the＂ core. To improve the accuracy of core temperature calculation, a nonlinear finite element based method for the real-time calculation of core temperature of single-core cable is proposed. The temperature gradients of cable core conductor in axial and radial directions as well as the diffusion rule of heat quantity in cable core are researched and the influences of such factors as operating current and ambient temperature on temperature distribution of cable core in axial and radial directions are analyzed. Based on the principles of heat transfer, the influence of cable thermal parameters varying with temperature on core conductor temperature is researched and then a three-dimensional nonlinear finite element model to calculate cable core temperature is built, and the built nonlinear finite element model is validated and modified according to experimental data. Comparison of experiment data with simulation results of the proposed model shows that the calculation error of cable core temperature is caused by neglecting the transmission of heat quantity along axial direction of cable and variation of cable thermal parameters; and it is also shown that the proposed real-time cable temperature calculation model is effective and is available for reference to the monitoring of core temperature of the cable operated in high temperature environment as well as to load forecasting.

关 键 词：单芯电缆 线芯温度 物性参数 非线性有限元法 实验验证 实时计算 

分 类 号：TM15[电气工程—电工理论与新技术]