Procedure for conduting vector group test on power
transformers.why it is conducted?
Answers were Sorted based on User's Feedback
Purpose: The Polarity and Phase relation tests are
importent when two or more transformer are to be
paralleled.Parelleled transformer must have the same
polarity and phase relation to avoid parial or complete
The L.V. vector will be superimposed on H.V. by connecting
1U & 2U Terminals. The three-phase voltage will be applied
to the line terminals of H.V. winding. Voltage measurement
will be done across:
Checks: - 1V-2V = 1V-2W
1W-2V > 1W-2W
1U-2N + 1V-2N = 1U-1V
|Is This Answer Correct ?||41 Yes||14 No|
Answer / pavan
Vector group analysis is done to know the phase displacement.
|Is This Answer Correct ?||17 Yes||5 No|
Answer / gunasekaran
this is important for parallel operation vector group should
be same another one is vector group is changed polarity of
the transformer also change it YNyn0 become YNyn6 if it is
|Is This Answer Correct ?||6 Yes||1 No|
Answer / r. n. aggarwal
It is conducted to ascertain the polarity and phase
The polarity of two transformer having the same vector
group must be same.
A further check to confirm that the polarity or phase
displacement ( vector group ) of two transformer is the
same.A single three phase LT supply is fed to the HT side
of Transformers and the same phase of the LT suppy must be
connected to the corresponding HT terminals of
Transformers .Then the voltage is checked on LT terminals
of transformers with multimeter between the same phases and
it should read almost zero.
|Is This Answer Correct ?||3 Yes||0 No|
Answer / anil k panjani
I would like to know the test procedure for Dyn11 vector
group and the conditions to be met for the same
|Is This Answer Correct ?||2 Yes||0 No|
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