The effects of the harmonic components upon transformer active losses in case of (non)sinusoidal sources and (non)linear loads

In computing of transformer losses, it is assumed that source voltage is sinusoidal and load impedance is linear. For the four operating modes chosen, non(sinusoidal) source voltage and non(linear) load impedance, core losses and windings losses of the transformer are computed using on-line measurements of the primary and secondary sides. The results are presented and compared in this paper with the experimental results of the active losses on the transformer, on the different operation modes. Active losses have been obtained on both the resistance of the core (R_fen) and winding resistances (R_1n and R_2n). These active losses have been obtained considering maximum harmonic amplitude, maximum harmonic order, loading factor and loading time.