A Refined Simulation Method for the Vibration Characteristics of Transformer Core Considering the Influence of Air Gap under the Perspective of Electro-Magnetic-Mechanical Coupling

被引：0
作者：
Zhao, Xiaojun [1 ]
Zhang, Jiawei [1 ]
Wang, Haoming [1 ]
Miao, Yu [2 ]
Liu, LanRong [3 ]
机构：
[1] Department of Electrical Engineering, North China Electric Power University, Baoding
[2] Electric Power Research Institute of Guizhou Power Grid Co. Ltd, Guiyang
[3] Hebei Provincial Key Laboratory of Electromagnetic & Structural Performance of Power Transmission and Transformation Equipment, Baoding
来源：
Diangong Jishu Xuebao/Transactions of China Electrotechnical Society | 2024年 / 39卷 / 14期
关键词：
Field path coupling; laminated core; magnetostriction; vibration;
D O I：
10.19595/j.cnki.1000-6753.tces.230719
中图分类号：
学科分类号：
摘要：
Due to the combined effects of Maxwell force and magnetostrictive force, the transformer core inevitably vibrates in actual operation. The vibration of the core can cause noise pollution and loosen components. In severe cases, it may threaten the power supply reliability of the power system. Currently, finite element simulation is usually used to calculate the core vibration, but this method has a long calculation time and low efficiency. This paper proposes a refined modeling and calculation method based on the electromechanical analogy method for core multiphysics coupling characteristics. Firstly, the step overlap area of the transformer core is studied. In the presence of air gaps, the magnetic properties of a single silicon steel sheet are measured, and the equivalent magnetic properties of the overlap area are analyzed through local magnetic circuit modeling to obtain the equivalent magnetic resistance of the overlap area. Based on reasonable assumptions and simplification, the overall equivalent magnetic circuit topology of the transformer is constructed. Secondly, according to the electromechanical-electrical analogy method and mechanical vibration theory, an equivalent vibration loop model in the form of a two-port cascade is established based on the magnetic field distribution characteristics of the lap area to realize the rapid and accurate calculation of the core vibration characteristics. In addition, a vibration test platform for the single-phase three-column transformer core model is built. The data, including vibration displacement, excitation current, and core flux density under different excitation voltages, are compared with the calculation results of the model. The calculation results are in good agreement with the experimental results, which verifies the effectiveness and accuracy of the proposed method. The magnetostrictive vibration characteristics in the lap area are analyzed. The vibration of the lap region is stronger than that of the non-lap area, mainly because the local magnetic flux density in the lap region tends to be saturated, making the magnetostrictive force significantly stronger. In conclusion, the theoretical analysis and experimental results show that the proposed electro-magnetic-mechanical multiphysics coupling calculation method considering the influence of air gap obtains the distribution characteristics of the transformer core magnetic field and reflects the mechanical vibration distribution characteristics caused by a non-uniform magnetic field. Compared with the traditional finite element calculation method, the proposed method greatly saves calculation time and cost. © 2024 China Machine Press. All rights reserved.
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页码：4257 / 4269
页数：12
相关论文
共 35 条
  • [1] Wang Gepeng, Jin Wende, Zeng Xiangyang, Et al., Analysis and control research on core vibration of UHV shunt reactor, Transactions of China Electrotechnical Society, 37, 9, pp. 2190-2198, (2022)
  • [2] Zhu Yeye, Ji Shengchang, Zhang Fan, Et al., Vibration mechanism and influence factors in power transformers, Journal of Xi’an Jiaotong University, 49, 6, pp. 115-125, (2015)
  • [3] Bai Baodong, Liu Chuang, Wang Jiayin, Simulation and experimental research of transformer vibration under DC magnetic bias, Transactions of China Electrotechnical Society, 28, S2, pp. 427-433, (2013)
  • [4] Zhao Lihua, Feng Yao, Xie Rongbin, Et al., Analysis of vibration characteristics for oil-immersed transformer core, Proceedings of the CSU-EPSA, 30, 10, pp. 104-110, (2018)
  • [5] Wang Jiayin, Bai Baodong, Liu Hongliang, Et al., Research on vibration and noise of transformers under DC bias, Transactions of China Electrotechnical Society, 30, 8, pp. 56-61, (2015)
  • [6] Zhao Xiaojun, Zhang Lingyun, Liu Yang, Et al., Experimental study on the effect of mechanical stress on the comprehensive magnetic properties of the grain-oriented silicon steel, Transactions of China Electrotechnical Society, 37, 22, pp. 5776-5787, (2022)
  • [7] Shahaj A, Garvey S D., A possible method for magnetostrictive reduction of vibration in large electrical machines, IEEE Transactions on Magnetics, 47, 2, pp. 374-385, (2011)
  • [8] Bartoletti C, Desiderio M, Di Carlo D, Et al., Vibro-acoustic techniques to diagnose power transformers, IEEE Transactions on Power Delivery, 19, 1, pp. 221-229, (2004)
  • [9] Kitagawa W, Ishihara Y, Todaka T, Et al., Analysis of structural deformation and vibration of a transformer core by using magnetic property of magnetostriction, Electrical Engineering in Japan, 172, 1, pp. 19-26, (2010)
  • [10] Moses A., Measurement of magnetostriction and vibration with regard to transformer noise, IEEE Transactions on Magnetics, 10, 2, pp. 154-156, (1974)
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