Nowadays, when the power quality term is more frequently used, new questions comes about the solutions of both technical and theoretical problems associated with this phenomenon. One of these questions is the approach of power losses determination in power transformers due to harmonic currents flowing through their windings. This article describes the method of calculating the active power losses due to harmonic current flows through transformers based on IEEE standard C57.110-2018 and analyzes the effect of harmonic current flow on the power loss of a real transformer with different size of load.
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