Can anyone explain how the vector diagram of a transformer which doesn't

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?

Question Posted / skrnoopuram

4 Answers
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TATA, I also Faced
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Can anyone explain how the vector diagram of a transformer which doesn't have name plate be f..

Answer / geno peter

well , we can find the vector group by doing vector group
test

Is This Answer Correct ?

13 Yes

1 No

Can anyone explain how the vector diagram of a transformer which doesn't have name plate be f..

Answer / loke

Ya ! first of all you can decide Yd or Dy by seeing it
primary & secondary connections and 1,2,3....11 we can
decide it by doing vector group tests int that we can check
phase shift of wave form & we can conclude

Is This Answer Correct ?

7 Yes

0 No

Can anyone explain how the vector diagram of a transformer which doesn't have name plate be f..

Answer / 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

Is This Answer Correct ?

7 Yes

0 No

Can anyone explain how the vector diagram of a transformer which doesn't have name plate be f..

Answer / kalidass

Yah! can.
If Dy11
Primary winding having only 3 terminals with high
resistance and secondary havign 4 terminals with low
resistance.

If Yd11
Primary having 4 terminals with high resistance and
secondary having 3 terminals with low resistance.

If Dy5
This is not a verctor group.

Eppdi???

Is This Answer Correct ?

8 Yes

30 No

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