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

        Li Longnv,Hu Shengyang,Zhao Yishuang,Xiao Hang,Liu Tao,Xue Ming,Zhu Gaojia 대한전기학회 2023 Journal of Electrical Engineering & Technology Vol.18 No.5

        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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