Research on Numerical Simulation of 3D Leakage Magnetic Field and Short-circuit Impedance of Axial Dual-low-voltage Split-winding Transformer

Yan Li, Longnv Li, Yongteng Jing, Fangxu Han

Research Institute of Special Electrical Machines, Shenyang University of Technology, Shenyang, China.

DOI: 10.4236/epe.2013.54B208                

Abstract

It is difficult to accurately calculate the short-circuit impedance, due to the complexity of axial dual-low-voltage split-winding transformer winding structure. In this paper, firstly, the leakage magnetic field and short-circuit impedance model of axial dual-low-voltage split-winding transformer is established, and then the 2D and 3D leakage magnetic field are analyzed. Secondly, the short-circuit impedance and split parallel branch current distribution in different working conditions are calculated, which is based on field-circuit coupled method. At last, effectiveness and feasibility of the proposed model is verified by comparison between experiment, analysis and simulation. The results showed that the 3D analysis method is a better approach to calculate the short-circuit impedance, since its analytical value is more closer to the experimental value compared with the 2D analysis results, the finite element method calculation error is less than 2%, while the leakage flux method maximum error is 7.2%.

Keywords

Split-winding Transformer; Short-circuit Impedance; Field-circuit Coupled; Current Distribution

Conflicts of Interest

The authors declare no conflicts of interest.

References

[1]	S. S. Wang, Y. M. Li and Y. N. Guo, “Calculation of Short-circuit Impedance for Power Transformer with Coupling FEM Method of Magnetic Field and Circuit,” High Voltage Engineering, Vol. 32, No. 11, 2006, pp. 11-14.
[2]	B. R. Xie, Q. F. Chen and X. S. Li, et al., “Calculation of the Short-circuit Impedance of the Transformer with Split Types of Windings Using Three-dimensional FEM,” High Voltage Engineering, Vol. 33, No. 6, 2007, pp. 97-101.
[3]	K. F. Qu, W. Zhao and B. Jiang Bo, et al., “3D FEM Computation of Magnetic Field of Heavy Current Transformer with Shielding Coils,” High Voltage Apparatus, Vol. 45, No. 1, 2009, pp. 25-32.
[4]	P. Zhou, D. Lin and W. N. Fu, et al., “A General Simulation Approach for Coupled Field-circuit Problems,” IEEE Tans. on Magnetics, Vol. 42, No. 4, 2006, pp. 1051-1054. doi:10.1109/TMAG.2006.871374
[5]	S. Kanerva, S. Seman and A. ArkkIio, “Inductance Model for Coupling Finite Element Analysis With Circuit Simulation,” IEEE Tansactions on Magnetics, Vol. 41, No. 5, 2005, pp. 1620-1623.
[6]	B. R. Xie, Q. F. Chen and C. H. Kang, et al., “Modeling and Impedance Parameter Design for Multi-winding Transformer Based on Combined Field-circuit Coupled Method,” Proceeding of the CSEE, Vol. 29, No. 9, 2009, pp. 104-111.
[7]	F. X. Han, Y. Li and X. Sun, et al., “Calculation of Leakage Magnetic Field and Short Circuit Impedance of Power Transformer,” Transformer, Vol. 47, No. 10, 2010, pp. 9-12.
[8]	J. M. Wang, J. G. Jia and L. R. Liu, et al., “Research on Numerical Simulation of Three Dimensional Leakage Magnetic Field and Short Circuit Impedance of Phase-Shifting Rectifier Transformer,” Transformer, Vol. 46, No. 4, 2009, pp. 1-5.