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Reply To: Transformer riddle no.5 – Ynyn Connection with Additional Delta Connection

#1322
AMIR KHASHAYAR

    In absence of tertiary winding , the current arisen from third harmonic flux and unbalanced loads will pass through neutral point of wye winding and unknown routes up to neutral point of source. This current will interfere with other systems particularly communication systems . Having a tertiary winding leads to circulating of third harmonic flux inside the tertiary winding and unbalanced load currents converts to negative phase sequence current . On the other hand , if the said current passes the neutral point of wye winding , this point will be warm unavoidably and if it’s grounded through impedance , it will fluctuate over earth potential .