On-Line Measurement of Transformer Losses under Non-Sinusoidal Operation

D. Lin and E.F. Fuchs (USA)


Accuracy, copper losses, dc bias, harmonics, iron-core losses, non-sinusoidal operation, power transformer, real time monitoring.


The on-line monitoring of iron-core and copper losses of single- and three-phase transformers is important, particularly for transformers feeding nonlinear loads. This paper devises a new digital data-acquisition method for the separate on-line measurement of iron-core and copper losses of three-phase transformers under any full or partial load conditions. The accuracy requirements of the instruments (voltage and current sensors, volt and current meters) employed are addressed. The maximum errors are acceptably low if voltage and current sensors with 0.1 to 0.5% accuracy are used.

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