A Method for Losses Evaluation in Large Power Transformer Tanks
The aim of this paper is to show how it is possible to calculate, with a good approximation, the eddy current losses in metal transformer parts. The calculation method is firstly described: it consists in the calculation of vector potential, starting from the diffusion equation discretized by means of the Finite Elements Method, with the ferromagnetic material of the tank taken as linear; the eddy current losses are then calculated. Finally, the method is applied to the analysis of two machines, respectively of 350 kVA and 370 MVA; it is also shown that in order to achieve good results, the above method requires several basic hypotheses which vary from case to case.
KeywordsDiffusion Equation Vector Potential Magnetic Permeability Ferromagnetic Material Nominal Power
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