Gas‐insulated lines (GIL) are widely used due to their many advantages in power plants and substations. The security and reliability of GIL is achieved by continues testing and monitoring. The main fault in the GIL compartments is overheating, which is rarely to occur, nonetheless, it cannot be ignored. In the present study, GIL steady‐state thermal behavior was investigated. For this reason, a multiphysics finite element model (FEM) was built to analyze the magneto‐hydro‐thermal characteristics of the GIL insulation gas. The simulation coupling includes the electromagnetic field, flow field and thermal heat transfer field. SF₆/N₂ and CF₃I/N₂ mixtures were studied and the influence of different gas properties on the magnetic flux density, heat distribution and flow velocity had been investigated. The results were compared to an experimental setup to validate the model calculations. Temperature rise tests have been conducted on the GIL inner and outer shell. The measurements were in good agreement with the simulation results. Finally, the presented work is also to serve as a good reference in future design and optimization of GIL structure. © 2021 Institute of Electrical Engineers of Japan. Published by Wiley Periodicals LLC.

中文翻译：

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高压气体绝缘管道（GIL）中SF6 / N2和CF3I / N2混合物的稳态热行为研究

气体绝缘线路（GIL）由于在发电厂和变电站中具有许多优势而被广泛使用。GIL的安全性和可靠性是通过持续测试和监视来实现的。GIL隔室中的主要故障是过热，这种情况很少发生，但是不能忽略。在本研究中，对GIL稳态热行为进行了研究。因此，建立了一个多物理场有限元模型（FEM）来分析GIL绝缘气体的磁水热特征。模拟耦合包括电磁场，流场和热传递场。SF ₆ / N ₂和CF ₃ I / N ₂研究了混合气，研究了不同气体性质对磁通密度，热分布和流速的影响。将结果与实验设置进行比较，以验证模型计算。已对GIL内壳和外壳进行了温升测试。测量结果与仿真结果非常吻合。最后，本文的工作也将为将来的GIL结构设计和优化提供参考。©2021日本电气工程师学会。由Wiley Periodicals LLC发布。