Calculation and Analysis of Branch Currents of Single Spiral Winding Transformer Based on Field Circuit Coupled Method
Guo Jian1, Lin Heyun2, Xu Zihong3, Jin Chengxiang3, Li Ning3
1. Nanjing University of Aeronautics and Astronautics Nanjing 210016 China 2. Southeast University Nanjing 210096 China 3. Zhongdian Electric Group Yangzhong 212211 China
Abstract:Transformer windings circulating currents between parallel conductors will lead to loss increasing and local overheating, which will affect the operation of transformer. Based on field-circuit coupled method, the finite element model and mathematical model of single spiral winding transformer are established. The field-circuit coupled model takes every branch current as independent variable to make up of the stiffness matrix. The branch currents of different transposition patterns are calculated and their influence factors are analyzed. The calculation results of induced current and short-circuit impedance are well matched with the designed values, which demonstrates that the method in this paper is effective. At the same time, this research also shows that in the same conditions, the "424" transposition has the advantage of small circulation current losses, but it is not obviously in inhibiting circulation current losses compared with the "212" transposition. In view of the uniform distributions of branch currents and losses, the "212" transposition should be the best choice in the three transposition patterns of single spiral winding.
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Guo Jian, Lin Heyun, Xu Zihong, Jin Chengxiang, Li Ning. Calculation and Analysis of Branch Currents of Single Spiral Winding Transformer Based on Field Circuit Coupled Method. Transactions of China Electrotechnical Society, 2010, 25(4): 65-70.
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