RESEARCH ON ENGINEERING METHOD OF WINDING CURRENT DISTRIBUTION AND MECHANICAL FORCE FOR SPECIAL TRANSFORMER

摘要

In order to study the leakage magnetic field, the current and short-circuit force distribution of windings for the special transformer, firstly, the three dimensional leakage magnetic field calculation model and the corresponding equivalent circuit are established by taking advantage of field-circuit coupled method (FCCM). Then, the leakage magnetic field, short-circuit impedance and branches current distribution of low voltage winding are analyzed and verified. Finally, on the basis of the winding current distribution rule summarized by above analysis, the leakage magnetic field distribution and mechanical forces are obtained by using simplified calculation model and FEM analysis software. The verification of the magnetic field distribution and impedance ensure the reasonability of the calculation method. Therefore, this paper provides engineering practical and efficient calculation approach of parameters design for special transformer.