TITLE:
Research on Numerical Simulation of 3D Leakage Magnetic Field and Short-circuit Impedance of Axial Dual-low-voltage Split-winding Transformer
AUTHORS:
Yan Li, Longnv Li, Yongteng Jing, Fangxu Han
KEYWORDS:
Split-winding Transformer; Short-circuit Impedance; Field-circuit Coupled; Current Distribution
JOURNAL NAME:
Energy and Power Engineering,
Vol.5 No.4B,
November
13,
2013
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%.