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How to test Power Transfomer vector group in the field?
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Answer Posted / 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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