Answer / chicoybolanio

Put the tap position on the nominal taps.
Connect the 4 core cable with MCB on the HV side and the
leads cable at LV side and make sure that
the LV side in open circuit. Then loop together between HV
red phase and LV red phase.
Inject 415V (Switch on the MCB) at HV side and measure the
voltage at LV side for each phase. record results and by
using the test result and following proper scale draw the
vector group of the transformer winding.

Answer / akr

depending upon vector group we shorted winding provde
voltage & check voltage another terminals terminal decided
by vector group

Answer / n.l.narasimham

Short R-r,Y-y,B-b and extend 3 phase supply to HV side.
Measure voltages of different combinations viz.R-y,R-b,
Y-r,Y-b and so on... Then plot the obtained results on a
graph sheet duly taking a convenient scale (eg.100v=5cm)

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