Analysis of 3-phase transformer no-load characteristics

Document Type



The traditional laboratory experiment on three- phase transformer connections consists of a qualitative observation of current and phase voltage waveforms by means of an oscilloscope, with emphasis placed on the dominant third harmonic component. Some recorded waveshapes, however, cannot be explained in simple terms without considering other harmonic components and the quality of power supply. This paper outlines an improved Iecture experiment that quantitatively analyzes the waveforms of various transformer connections under steady-state no-load conditions while taking into account the non-ideal voltage supply. The experimental data obtained with the aid of a harmonic analyzer are then compared to the qualitative predictions and the discrepancies are discussed.


Electric distortion; Electric power distribution; Electric power systems; Harmonic analysis; Phase distortion (Electronics)


Controls and Control Theory | Electrical and Computer Engineering | Electrical and Electronics | Electromagnetics and Photonics | Signal Processing | Systems and Communications


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