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can we connect both delta and star to the transformer
secondary and for what reason?
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Answer Posted / gopi
suppose in transformer one side of coil of each phase can
connect to ground potential. It means that the insulation
strength of transformer can be reduced compared with Delta
connection . It realize cost down of transformer. Delta
connected coil need same insulation strength on both side
of coil, so it need more cost for insulation. But in Star
connection, harmonics problem will appear. In case of Delta
connection, harmonics current is circulating in delta-
connected coils and not appear in distribution line. If the
harmonic current was there, it will be a cause of over heat
of lead-phase capacitor, lag-phase inductance and
transformaer.
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