Question

How are harmonics generated in a transformer?

Answer 1

Non-linear devices generate harmonic currents. ... In normal operation the harmonic currents due to transformer core are low except if the magnetic core is downsized. During transformer switching-on, inrush current magnitude is typically several times the rated current magnitude and the harmonic content is high.

Answer 2

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Harmonics in Three Phase Transformers. The harmonic is the distortion in the waveform of the voltage and current. It is the integral multiple of some reference waves. The harmonic wave increases the core and copper loss of the transformer and hence reduces their efficiency.....