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Design Optimization of a Combined Shielding Structure for a High Impedance Auto-Transformer

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Abstract

In this paper, a combined shielding structure for the oil tank of an OSFSZ-250000KVA/220 kV transformer is proposed and optimized to reduce the magnetic flux leakage and the stray losses. Firstly, the shielding effects of the transverse and longitudinal shielding structures are studied based on three-dimensional frequency-domain nonlinear finite element method. Secondly, the combined shielding structure is proposed with copper shielding introduced at both ends of the transverse magnetic shielding to effectively reduce the magnetic flux leakage of the oil tank. Therefore, the eddy current loss in the oil tank can be significantly reduced. Finally, Taguchi method is used to optimize the structural parameters of the combination shielding to reduce both the oil tank eddy current losses and the shielding costs. The study in this paper can provide guidance for the design of large capacity power transformers, and has important engineering significance.

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Acknowledgements

This work was supported by the National Natural Science Foundation of China under Grant 52107007, and by the Natural Science Foundation of Tianjin under Grant 18JCQNJC70500 and 19JCQNJC03600.

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Authors and Affiliations

  1. School of Electrical Engineering, Tiangong University, Tianjin, China

    Longnv Li, Shengyang Hu, Yishuang Zhao, Hang Xiao, Tao Liu, Ming Xue & Gaojia Zhu

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  1. Longnv Li
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  2. Shengyang Hu
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  3. Yishuang Zhao
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  4. Hang Xiao
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  5. Tao Liu
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Correspondence to Gaojia Zhu.

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Li, L., Hu, S., Zhao, Y. et al. Design Optimization of a Combined Shielding Structure for a High Impedance Auto-Transformer. J. Electr. Eng. Technol. 18, 3569–3580 (2023). https://doi.org/10.1007/s42835-023-01422-1

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  • DOI: https://doi.org/10.1007/s42835-023-01422-1

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