Author(s)

Yan Li, Longnv Li, Yongteng Jing, Fangxu Han

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

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%.

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

Y. Li, L. Li, Y. Jing and F. Han, "Research on Numerical Simulation of 3D Leakage Magnetic Field and Short-circuit Impedance of Axial Dual-low-voltage Split-winding Transformer," Energy and Power Engineering, Vol. 5 No. 4B, 2013, pp. 1093-1096. doi: 10.4236/epe.2013.54B208.