Equivalent Modeling of Temperature Field for Amorphous Alloy 3D Wound Core Transformer for New Energy

Jianwei Han, Xiaolin Hou, Xinglong Yao, Yunfei Yan, Zonghan Dai, Xiaohui Wang, Peng Zhao, Pengzhe Zhuang () and Zhanyang Yu
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Jianwei Han: Longyuan New Energy Co., Ltd., Yantai 265400, China
Xiaolin Hou: Longyuan New Energy Co., Ltd., Yantai 265400, China
Xinglong Yao: Longyuan New Energy Co., Ltd., Yantai 265400, China
Yunfei Yan: Xi’an Thermal Power Research Institute Co., Ltd., Xi’an 300072, China
Zonghan Dai: Longyuan New Energy Co., Ltd., Yantai 265400, China
Xiaohui Wang: Xi’an Thermal Power Research Institute Co., Ltd., Xi’an 300072, China
Peng Zhao: Longyuan New Energy Co., Ltd., Yantai 265400, China
Pengzhe Zhuang: School of Electrical Engineering, Shenyang University of Technology, Shenyang 110870, China
Zhanyang Yu: School of Electrical Engineering, Shenyang University of Technology, Shenyang 110870, China

Energies, 2025, vol. 18, issue 12, 1-17

Abstract: It is of the utmost importance to accurately solve the transformer temperature field, as it governs the overall performance and operational stability of the transformer. However, the intricate structure of high- and low-voltage windings, insulating materials, and other components presents numerous challenges for modeling. Temperature exerts a significant influence on insulation aging, and elevated temperatures can notably accelerate the degradation process of insulation materials, reducing their service life and increasing the risk of electrical failures. In view of this, this paper proposes an equivalent modeling method of the temperature field of the transformer HLV winding and studies the refined modeling of the winding part. First of all, in order to reduce the difficulty of temperature field modeling, based on the principle of constant thermal resistance, the fine high- and low-voltage windings are equivalent to large conductors, and the equivalent thermal conductivity coefficient of the high- and low-voltage windings is obtained, which improves the calculation accuracy and shortens the calculation time. Secondly, we verify the feasibility of the equivalent model before and after the simulation, analyze the influence of different boundary conditions on the winding temperature field distribution, and predict the local hotspot location and temperature trend. Finally, a 50 kVA amorphous alloy winding-core transformer is tested on different prototypes to verify the effectiveness of the proposed method.

Keywords: 3D wound core transformer; equivalent thermal conductivity; winding equivalent; temperature field (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2025
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