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The behaviour of a superconducting composite carrying a transport current and subjected to a transverse fast changing magnetic field has been simulated with an equivalent electrical network. The problem of the current distribution inside the composite under steady-state conditions has been solved with a computer code which leads to the exact solution of Maxwell's equations. The total loss power inside the composite has been calculated and the loss power provided by the d.c. power-supply has been separated from the loss power provided by the magnetic field. These different losses can be easily compared with experimental data as they correspond to the different measured losses.