Simulation Research on the Influence of Winding Deformation Degree on Transformer Magnetic Field Distribution and Winding Force

Transformer, as an important part of the grid, its failure or not has a direct relationship to the grid. In the transportation, installation or lifting cover process, by the impact, bumps and vibration, etc. may make the transformer winding deformation. In addition to transformer short-circuit fault generated after the electrodynamic short-circuit force will also make the winding deformation of different degrees. The winding deformation will affect the magnetic field distribution of the transformer, and the change of magnetic field will cause the change of force on the winding. Therefore, in order to study the effect of the degree of winding deformation on the magnetic field and force, a full-size model of the transformer was built in the finite element simulation software and then studied in this paper. The following conclusions are obtained: the winding deformation degree has influence on the magnetic field distribution and winding force; The greater the degree of winding deformation, the greater the axial magnetic field between the high voltage winding(hvw) and low voltage winding(lvw) cavities, the more radial leakage in the winding end, and the larger the degree of distortion of the magnetic field; the bigger the winding deformation degree, the smaller the overall force, and the specific force at the upper end of the winding corresponds to the magnetic field distribution.