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Reply To: Transformer Riddle No. 24 – Essentiality Tertiary winding in Power Transformer

#1614
R K Mohapatra

    The corner grounding may provide a path for flow of the Zer Sequence current through the HV neutral , which can be sensed by providing a a protection circuit . For 3phase core type power trfr, when a corner of tertiary is grounded , the other 2 phases experience a situation like Neutral shifting occurs . This will give rise to a unhbalanced violtage to the other 2 phases to some extent . Is ir preferred to leave the tertiary Delta winding floating in isolation so that zero seqiuence curremnt flows in the loop of the delta tertiary winding . For the sasme rason , the inrush currnt may be reduced in Isolated Tertiary conditiion rather than a grounded Teritiary condituion .