Analysis of Magnetic Field Leakage and Eddy Current Loss of Power Transformer Oil Tank

Abstract

With the increasing demand for electrical energy, power transformers, as an indispensable and important equipment in the power grid, are bound to develop towards larger capacity. At the same time, the transformer stray loss and eddy current loss caused can easily affect the normal operation of the transformer. Therefore, it is necessary to analyze the leakage magnetic field and eddy current field of metal structural parts of power transformers. In this paper, a large-scale power transformer in actual operation is simulated and calculated by the widely used ANSYS finite element software, and the numerical value and distribution of the magnetic flux leakage of the oil tank are obtained and analyzed in detail. On this basis, the eddy current field of the transformer oil tank is calculated and analyzed, and the density distribution law of the eddy current loss and the magnitude of the eddy current loss are obtained. The eddy current loss and the maximum eddy current loss density are reduced by adding a magnetic shield to the transformer oil tank, and the influence of different shielding sizes on the effect of reducing the eddy current loss of the oil tank is given. It provides a basis for designing the transformer oil tank more reasonably and reducing its eddy current loss more reasonably in engineering.