Calculation and Analysis of Leakage Flux Control Scheme in Metal Structural Parts of High Impedance Power Transformer

Accurate calculation of leakage magnetic field and reduction of eddy current losses in structural parts of power transformer to avoid local overheating is one of the important constituents of transformer design. Three-dimensional nonlinear finite element method is adopted to calculate and determine the optimal control scheme of leakage flux. The effect of different magnetic shielding and magnetic shunts schemes on eddy current losses reduction in tank and clamps are analyzed in a high impedance transformer with series reactor inside of tank which type is SFSZ-240MV A/220kV. Furthermore, the validation of the optimal shielding scheme is verified and compared by test results, and the calculation results are in good agreement with the experimental results.