Abstract：Investigation of temperature rise calculation of gas-insulated transmission lines (GILs) is critical for the reliability design and operation monitoring. To improve the calculation accuracy of GIL temperature, the finite-element model coupling electromagnetic field, fluid field and thermal field is established, in which the ambient air is also included. Iterative method is used to calculate temperature dependent Joule losses, which are coupled to thermal analysis with element mapping. Multiple species transport technique is employed and the properties of insulating gas and air are combined linearly to realize heat transfer analysis of different fluids in single model. With the proposed model, influence of operation current and ambient temperature on GIL temperature rise is analyzed. Moreover, the effects of the nonlinear thermal physical parameters and the variation of convective heat transfer coefficient are also examined. Concordance between the predicted temperature and experimental results in the literature validates the accuracy of the model. The results provide the correctness as theoretical references for GIL design and temperature monitoring of the conductor.
吴晓文, 舒乃秋, 李洪涛, 李玲. 气体绝缘输电线路温升数值计算及相关因素分析[J]. 电工技术学报, 2013, 28(1): 65-72.
Wu Xiaowen, Shu Naiqiu, Li Hongtao, Li Ling. Temperature Rise Numerical Calculation and Correlative Factors Analysis of Gas-Insulated Transmission Lines. Transactions of China Electrotechnical Society, 2013, 28(1): 65-72.
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2013, Vol. 28 
