Answer / sujeet pandey

there can transformers with 0 degree or 180 degree phase
displacement like in the case of star-star or delta-delta .
In case of star-delta or delta-star transformer there is a
phase difference of +30 or -30 degree depending on
connection b/w them.This phase difference is due to the
relation b/w phase voltage of primary winding and phase
voltage of secondary winding.

Answer / surendra

dy5 basaically suitable with respect to winding displacement
as need of 120 degree in space for obtaning pure revolving
flux. another reason is in this is pressure on winding will
be symetric...

Answer / srikant

i also faced it.....dont know

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