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%.
Cite this paper
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. 4, 2013, pp. 1093-1096. doi: 10.4236/epe.2013.54B208.
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