Calculation and Analysis of Transformer Core Loss Due to Technological Hole
Dou Runtian1,2, Li Yongjian1,2, Zhang Xian1,2, Yang Ming1,2, Chen Ruiying1,2
1. State Key Laboratory of Reliability and Intelligence of Electrical Equipment Hebei University of Technology Tianjin 300130 China; 2. Key Laboratory of Electromagnetic Field and Electrical Apparatus Reliability of Hebei Province Hebei University of Technology Tianjin 300130 China
Abstract：The loss and local temperature of the transformer core will be increased due to the presence of technological stacking holes, and even the performance of the transformer will be deteriorated. To study the influence of technological holes on transformer core loss and performance, the alternating magnetic properties of silicon steel materials are measured and the two-dimensional magnetic field of the holed core model is analyzed based on the Steinmetz formula. The theoretical calculation method of core loss caused by the hole with different shapes and sizes is proposed. Based on the finite element method, the two-dimensional transient magnetic field simulations of the grain-oriented steel sheets commonly used in transformer core are carried out, and the influence of technological holes with different types on transformer core loss is compared and analyzed. The magnetic properties testing system for silicon steel samples with the holes is established. The core loss and local temperature rise caused by the holes are quantitatively measured to verify the theoretical calculation method. The simulation and experimental results show that the calculation method of the core loss rise caused by the technological holes has high accuracy and engineering applicability.
窦润田, 李永建, 张献, 杨明, 陈瑞颖. 受工艺孔影响的变压器铁心损耗计算与分析[J]. 电工技术学报, 2022, 37(12): 2909-2923.
Dou Runtian, Li Yongjian, Zhang Xian, Yang Ming, Chen Ruiying. Calculation and Analysis of Transformer Core Loss Due to Technological Hole. Transactions of China Electrotechnical Society, 2022, 37(12): 2909-2923.
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2022, Vol. 37 
