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Delta - Wye Power Transformers

Delta - Wye Power Transformers

Delta - Wye Power Transformers

(OP)
Could someone please explain why most power transformers in utility substations are Delta - Wye.  Is it because of the imbalance on the load side(Wye) of the transformer.  Also, is there a 30 degree phase shift across the transformer.

RE: Delta - Wye Power Transformers

Delta-wye transformers are useful for a number of reasons.   For transmission and distribution lines that are solidy-grounded, the delta-wye provides an excellent ground reference and source of ground current for clearing faults.  Also, the delta-wye configuration isolates zero sequence current on each side of the transformer so that ground current relaying on one side does not see ground fault current for a ground fault on the other side.  

Yes, there is a phase shift.  For an ANSI transformer, the low side will always lag the high side by 30 degrees, regardless of the relative position of the delta and the wye windings.

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