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As you know, because the B/H curve of the magnetic material forming the transformer Core is not linear.
As you know, because the B/H curve of the magnetic material forming the transformer Core is not linear. If a sinusoidal voltage is being applied for a sinusoidal flux (and hence a sinusoidal secondary voltage), the magnetizing current is not sinusoidal. Thus the magnetizing current of a transformer having an applied sinusoidal voltage will comprise a fundamental component and various harmonics. The magnitude and composition of these harmonics will depend on the magnetizing characteristic of the core material and the value of the peak flux density. If the harmonics cannot flow in any of these paths then the output voltage will contain the harmonic distortion. Earthed Star connection and delta connection are suitable path for zero sequence currents.
In power transformers with "Ynyn" connection , there are suitable low- impedance path for third harmonic and other zero sequence currents (due to unbalance loads), as we can say: the tertiary delta connection is not necessary when two sides of star-star connection of transformer are earthed directly.
Is it correct? Whether we always don't need any delta tertiary winding in transformers with Ynyn connection?
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