The 3-dimention steady leakage magnetic field in a large power transformer with its low voltage winding of 32-filar helix, 16-filar helix, 8-filar helix and annular cylinder respectively are computed in this paper by using Maxwell 3D simulation software developed by Ansoft Corporation. The influence of axial current component of different helical angle winding on leakage magnetic field in the transformer is analyzed. The distributions of leakage magnetic field in different models are illustrated in this paper. By the computed results, the influence of axial current component on magnetic field with low voltage winding of 4-filar helix often used in practical large transformer is qualitatively analyzed. This is the first time that the axial current component of winding in a transformer is taken into account.
展开▼
