Answer / iamdon

The primary and secondary windings are used for normal
voltage/current transformation where as the tertiary
winding is used for following special purposes

1)Supply to substation auxiliaries.
2)Connecting static capacitors/synchronous condenser etc

The tertiary winding is connected in delta to allow the
flow of zero sequence current in the tertiary loop in the
case of unbalance.

Author:arbelectbit@yahoo.com

Answer / gunasekaran

the above answer is correct another one is keep the neutral
should be zero potential and it is giving closed bath for
third hormonics current

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