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Can anyone explain how the vector diagram of a transformer
which doesn't have name plate be found whether it is
Dy11/Dy5/Yd11 and so on?
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Answer Posted / k.prakashchandra
Whether Dy or Yd can be ascertained from the bushings.To
find particular vector group ,CRO can be used finding
relationship between the current vectors.e.g.In Dy 11 I2R
lags I1R by 30 degrees Number 11 denotes position of minute-
hand in a clock.It can also found out by taking various
voltage measuremnts and analysing
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