Numerical Calculation and Analysis of Lobe-Type Magnetic Shielding in High Voltage Auto-Transformer
Li Longnu1, Li Yan2, Liu Xiaoming1
1. Key Laboratory of Advanced Electrical Engineering and Energy Technology Tianjin Polytechnic University Tianjin 300387 China 。 2. School of Electrical Engineering Shenyang University of Technology Shenyang 110870 China
Abstract In this paper, a 334MV•A single-phase auto-transformer with lobe-type magnetic shielding is used as the prototype model, aiming at the design problem of a novel body magnetic shielding lobe-type magnetic shielding. Firstly, the influences of the lobe-type magnetic shielding on structure parts, leakage fields in windings and stray losses are examined using three-dimensional (3-D) non-linear frequency-domain finite element method (FEM). Taken the magnetic densities (loss densities) of tank, yoke clamp, tie plate, tank shielding and lobe-type magnetic shielding as the observation targets, the influences of lobe-type magnetic shielding location and size on the leakage fields of transformer are analyzed by the leakage field analysis and stray losses calculation. The load loss experiment has verified the analysis through comparing the calculation results with the experiments. Finally, three kinds of cooling oil models about lobe-type magnetic shielding are presented, regarding the local overheating problem on lobe-type magnetic shielding itself. The analysis of the lobe-type magnetic shielding characteristics provides important guidance and engineering significance of its own design in transformer.
Li Longnu,Li Yan,Liu Xiaoming. Numerical Calculation and Analysis of Lobe-Type Magnetic Shielding in High Voltage Auto-Transformer[J]. Transactions of China Electrotechnical Society, 2017, 32(22): 134-143.
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2017, Vol. 32 
