高压架空导线电流与轴向温度关系计算的热路模型

发布时间：2018-12-15 10:30

【摘要】：不同电流时的高压架空导线轴向温度分布对输电系统安全运行具有重要意义。根据热平衡原理,提出了基于状态方程形式的轴向热路模型。为验证模型精度,设计了导线温度测量实验平台,利用接续管使实验导线轴向产生温度分布,在自然对流条件下对不同电流时的LGJ—400导线和LJG—240导线轴向温度进行了实测。利用线性回归方法,对模型中导热热阻和对流热阻进行了灰箱辨识。热阻辨识结果表明在环境条件相对稳定时,随着导线电流及平均实验数据所用时间窗长度的增加,导线导热热阻呈增大趋势,对流热阻呈减小趋势。通过求解轴向热路模型时域响应,得到了导线温度分布计算值。与实验结果对比表明,热路模型计算结果平均误差在3%以内,精度高于IEEE标准模型,能够用于计算自然对流下LGJ—400导线和LJG—240导线的轴向温度分布。
[Abstract]:The axial temperature distribution of high voltage overhead conductors at different currents is of great significance to the safe operation of transmission systems. According to the principle of heat balance, an axial heat path model based on state equation is proposed. In order to verify the accuracy of the model, a traverse temperature measurement platform was designed. The axial temperature distribution of the experimental wire was produced by using the connecting tube. The axial temperature of the LGJ-400 wire and the LJG-240 conductor were measured under the condition of natural convection. The grey box identification of heat conduction resistance and convection heat resistance in the model is carried out by using linear regression method. The results of thermal resistance identification show that when the environmental conditions are relatively stable, with the increase of conductor current and the length of time window used in the average experimental data, the thermal resistance of conductor increases and the heat resistance of convection decreases. By solving the time-domain response of the axial thermal path model, the calculated values of conductor temperature distribution are obtained. Compared with the experimental results, the average error of the thermal path model is less than 3%, and the accuracy is higher than that of the IEEE standard model. It can be used to calculate the axial temperature distribution of LGJ-400 conductors and LJG-240 conductors under natural flow.
【作者单位】：南京理工大学能源与动力工程学院;国网南京供电公司;
【分类号】：TM751

【参考文献】