TO operate transformers in parallel, vector symbol of the
both should be same.If one transformer name plate is not
there, how can we conclude that whether the transformer is
having the same vector symbol or not?
Answers were Sorted based on User's Feedback
Answer / guru
Check the vector group by carrying out VECTOR Group testing
( By Injecting a 3 Ph 440v or 230 V to the primary windings
and check the voltage between the terminals in secondary
For each vector group there are standard values which has
to come in the secondary side
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Answer / rajendran
we can easily find out and confirm the vector group of the
transformer by using the standard test procedures.
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This vector group test is done at site to check if their is
any damage in the windings during transportation and
3 -phase AC supply is given on HV side. R-Phase HV and r-
phase LV shorted.
Then to qualify the test following conditions are to be
satisfied after measurement of voltages.
nR+nY=RY, By>> Bb and Yb=Yy.
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