Answer / geno peter

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

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

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

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???

Show Details FROM:Muhammed Ikram TO:qa@allinterview.com Message flagged Saturday, June 4, 2011 10:07 PMMessage bodyHello all, i want to ask a question to all of you that what is VMM (voltage monitoring module )? how it work,s? i heard somewhere that it compare 1 phase voltage to other phase voltage. but there is also some setting on it. how to set it,s setting. please tell me briefly. Thank,s and Regard,s. Muhammed Ikram.

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