In supply RYB are mentioned. But in transformers, why they
are mentioning XYZ?

Answer Posted / ullas

while we are mentioning about the supply system we can see
the terms RYB.
it is not a problem in mentioning the three different
phases with R Y B or U V W or X Y Z.
but one idea shall be used while identifying the three
phases. read the terminal near to neutral as R or U or X
etc.

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