Additional Losses of Anisotropic Transformers Under Nonsinusoidal Operating Conditions

an iterative algorithm is developed for the computation of additional transformer losses under (non)sinusoidal excitation and linear (R, RL, RC) loads. The proposed nonlinear model is a combination of frequency domain (to incorporate harmonics) and time domain (to account for saturation) techniques and only requires transformer parameters and (measured or computed) A - i characteristics. Computed magnetizing and core-loss currents are used to generate additional ironcore and copper losses (compared to sinusoidal losses) for different harmonic amplitude and phase angles. Finally, computed primary and secondary voltage and current waveforms and total losses are compared with measurements and show good agreements.

Additional Losses of Anisotropic Transformers Under Nonsinusoidal Operating Conditions Keywords:

Transformers , additional losses. harmonics , power quality