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.
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