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A delta connection should cause a 30 degree phase shift. It is necessary to know the configuration to tell whether this is +30 or -30 degrees.

Also, if you invert the connection, you can end up with [-30 + 180] 150 or [30 + 180] 210 degree phase shifting.

I've seen one transformer that had a delta connection that was phase shifted 150 degrees, but this is definitely NOT the norm.

Comment

Since the current is determined by the load, the answer to this question is that it depends upon

a. the nature of the load (resistive, R-L, R-C, R-L-C), and

b. whether the load is balanced or unbalanced.

In other words, it depends....

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