引用本文: | 魏建华,赵文彬,李 敏,等.基于有限元的低风压导线发热分析[J].电力系统保护与控制,2021,49(19):56-64.[点击复制] |
WEI Jianhua,ZHAO Wenbin,LI Min,et al.Heating analysis of a low-wind-pressure conductor based on finite elements[J].Power System Protection and Control,2021,49(19):56-64[点击复制] |
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摘要: |
架空输电线路作为电力系统的重要组成部分,能否安全运行直接影响到供电可靠性。低风压导线作为一种新型导线,降低了输电线路在大风工况下的风压,对架空输电线路安全运行具有重要意义。导线温度是限制线路输送容量的主要因素,为了对该导线进行更全面的评估,利用有限元仿真电磁-流固传热多物理场耦合模块,搭建导线与周围空气域的模型。考虑到绞线内部气隙及集肤效应和日照生热对导线径向温度分布的影响,采用将热源按层进行划分的方法,对低风压导线与常规导线在自然对流和强制对流两种情况下的温度特性进行对比分析。结果表明:导线的低风压构造使得在相同工况下的径向温差比常规导线要小很多,且基本不受对流条件的影响,而铝截面积的增加使得在相同载流量下发热减少,整体温度也低于常规导线。 |
关键词: 低风压导线 有限元分析 温度分布 径向温差 |
DOI:DOI: 10.19783/j.cnki.pspc.201560 |
投稿时间:2020-12-16修订日期:2020-12-16 |
基金项目:国家自然科学基金项目资助(52005315) |
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Heating analysis of a low-wind-pressure conductor based on finite elements |
WEI Jianhua1,ZHAO Wenbin1,LI Min2,DANG Peng3,4,YAO Yuan1 |
(1. School of Electrical Engineering, Shanghai University of Electric Power, Shanghai 200090, China; 2. School of Energy and
Mechanical Engineering, Shanghai University of Electric Power, Shanghai 200090, China; 3. Shanghai Electric Cable Research
Institute, Shanghai 200093, China; 4. The State Key Laboratory of Special Cable Technology, Shanghai 200093, China) |
Abstract: |
The safe operation of an overhead transmission line directly affects the reliability of power supply. The low-wind-pressure conductor is a new type which reduces the wind pressure of a transmission line under strong winds. It is of great significance to the safe operation of overhead transmission lines. The temperature of the conductor is the main factor limiting the transmission capacity of the line. For a more comprehensive evaluation, a multi physical field coupling module of electromagnetic fluid solid heat transfer is simulated by the finite element method, and the model of conductor and surrounding air domain is built. Considering the air gap and skin effect in the strand and the influence of sunshine heat generation on the radial temperature distribution of the conductor, the heat source is divided by layer. The temperature characteristics of the low wind pressure conductor and conventional conductor under natural convection and forced convection are compared and analyzed. The results show that the low-wind-pressure structure of the conductor makes the radial temperature difference much smaller than that of the conventional conductor under the same working conditions, and is basically not affected by the convection conditions. The increase of aluminum cross-sectional area reduces the heating under the same current carrying capacity, and the overall temperature is lower than that of a conventional conductor.
This work is supported by the National Natural Science Foundation of China (No. 52005315). |
Key words: low-wind-pressure conductor finite element analysis temperature distribution radial temperature difference |