Answer / sridharan

Vector group means it define the primary & secondary side
connection type of the transformer says D for the delta
connections & Y for the star connections then the 11 stands
for the phase displacements between the primary side &
secondary side.In the sense in a clock while 11 o clock
shows the angle between the small needle & big needle will
be 30 degree, so the phase displacement will be 30 degree.

The coils having selfinductancs 10mh and15mh,effective inductance 40mh when connected in series aiding. what will be the equivalent inductance if we connect them in series opposing?

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