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Su-Tong UHV AC GIL project is now the world's first ultra-long-distance GIL river-crossing project with the highest voltage level, the largest transmission capacity, and the most advanced technology. Due to the most of the GILs are placed in the tunnels under the Yangtze River and the heat dissipation conditions are harsh, it is necessary to carefully examine the thermal characteristics of GIL during preliminary design and type testing. In this paper, firstly, based on the two different conductor structures adopted in the Su-Tong project, the finite element models were established; Then, using the 3-D electromagnetic thermal fluid coupling method, the temperature and velocity distribution of two structure were simulated in the ANSYS-CFX under the effective current of 6930A considering the same amount of enclosure current reflow; Finally, the temperature rise type-test was carried out, and the test results verified the correctness of the simulation method. The research results in this paper provide a predictive basis for the thermal characteristics of UHV AC GIL to ensure the safe operation of the project. Meanwhile, detailed temperature rise test data can also provide references for future GIL design and research work.
Inspec keywords: conductors (electric); computational fluid dynamics; gas insulated transmission lines; temperature distribution; cooling; finite element analysis; tunnels
Subjects: Finite element analysis; Numerical approximation and analysis; Power transmission lines and cables; General fluid dynamics theory, simulation and other computational methods; Conductors