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Start with the star side since both ph-ph and ph-n vectors exist
Assume A ph-n is at 0 degrees
We can now see that there is a winding associated with each phase
The angle of that voltage is at 0 degrees \hence the angle f the voltage eon its other winding is also at zero degrees.
We therefore have 3 star voltages 120 degree apart
And 3 voltages on the other winding 120 degrees apart
So taking these other windings we have the choice of connecting them in star or delta
If in star then either the winding is connected to give 0 degree phase shift or 180 degree phase shift
If in delta we can decide which end connects to which other end of which other phase
i.e. taking the A winding, end 1 can connect to either
B winding end 2 or
C winding end 2
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