Abstract
Taking a 380000kVA/500kV large power transformer as an example, in this paper, the eddy current loss generated by leakage magnetic field in transformer tank is calculated by two 3-D finite element methods (FEM) and the factors to affect the computation accuracy of loss are discussed. By adding magnetic shielding to the surface of oil tank, the maximum magnetic flux density and total eddy current loss are computed, and the effect of different size of the magnetic shielding is discussed.
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