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The delta-Y transformer has a 30 degree phase shift.

If we model the 30 degree phase shift in raw data file, the power flow result will have a 30 degree difference between from bus and to bus of a transformer. It is both weird and not intuitive for dynamic analysis.

However, if we don't model the 30 degree phase shift, the short circuit result is not accurate.

So what is the general rule of the Y-delta transformer modelling in PSSE?

Thank you.