Calculation of Temperature Rise of Large Transformer under Geomagnetically Induced Current
Zhu Tao1, Wang Fenghua2
1. College of Electrical Engineering Shanghai University of Electric Power Shanghai 200090 China; 2. Department of Electrical Engineering Shanghai JiaoTong University Shanghai 200240 China
Abstract：To accurately analyze the feature of temperature rise of power transformer under the action of geomagnetically induced current (GIC), an electromagnetic-flow and heat field coupling 3D simulation model for a 500kV three-phase integrated oil-immersed power transformer is proposed in this paper. The loss density and temperature field distribution of internal components of power transformer under different GICs are calculated when the transformer is operated at rated load. Meanwhile, the dynamic temperature rise curve of internal components of power transformer under different GICs is obtained according to the IEEE C57.163 standard. The simulation results are in good agreement with the designed results. In addition, the eddy current loss distribution of the clamp, pulling plate and oil tank of the power transformer is uneven after being affected by GIC, and increases with the increase of the GIC. With the action of GIS pulse, the local temperature of metal components of the transformer rises rapidly and approaches the permissible limit for the pulling plate of main column at the 100A DC pulse. The results can provide a reference for the tolerance performance analysis of large transformer under the action of GIC.
朱涛, 王丰华. 地磁感应电流作用下大型变压器的温升特性计算[J]. 电工技术学报, 2022, 37(8): 1915-1925.
Zhu Tao, Wang Fenghua. Calculation of Temperature Rise of Large Transformer under Geomagnetically Induced Current. Transactions of China Electrotechnical Society, 2022, 37(8): 1915-1925.
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