Abstract：The operating temperature of overhead transmission lines is the vital state variable of dynamic capacity incensement and sag and tension calculation. The conductor is always treated as an isothermal section in current standards of transmission line temperature calculation to compute the conductor surface or average temperature. In fact, there exists temperature gradient distribution and different response in the cross-section of conductor, which are influenced by such factors as skin effect, external forced convection and different twisted materials, and while ignoring them the line stress and sag calculation as well as the transmission system safety evaluation may suffer from poor performance. Therefore, in order to accurately analyze and calculate the gradient distribution and difference in response of the conductor cross-section temperature. Firstly, a thermal network model is established by focusing on radial and circumferential heat transfer paths in conductor cross-section. Then, two calculation methods of conductor radial and circumferential temperature are developed respectively by adopting nonlinear iteration and parameter identification. The method adopting nonlinear iteration can fully consider the influence of temperature variation characteristics as material properties, convective heat resistance and radiation heat in the process of heat transfer, the method adopting parameter identification can effectively overcome the problem of uncertain model parameters caused by thermal deformation of the conductor under forced convection. Finally, the validity and accuracy of the proposed thermal network model and calculation methods are verified by a test platform.
胡剑, 熊小伏, 王建. 基于热网络模型的架空输电线路径向和周向温度计算方法[J]. 电工技术学报, 2019, 34(1): 139-152.
Hu Jian, Xiong Xiaofu, Wang Jian. Radial and Circumferential Temperature Calculation Method of Overhead Transmission Lines Based on Thermal Network Model. Transactions of China Electrotechnical Society, 2019, 34(1): 139-152.
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