Answer / pillay

RYB, RST, UVW, AND XYZ IS used simply to differentiate
the various terminals.
In a transformer there are actually two sets of terminals
actually you can name them both as RYB but how are you going to
differentiate from the primary and the secondary. Now we use RYB
OR RST as the primary and the secondary as XYZ OR UVW.We use
the same reasoning whenever there are two options for example the
power connections to a soft starter or the connections in a
variable frequency drive.

Answer / 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.

Answer / masiga

In supply(end user): It is imperative to identify the
R-red,Y-yellow,B-blue which correspond to the standard color
codes for live, ground and neutral.

In transformers(transmission): The three XYZ phases have the
same electrical components/qualities, might as well name
them UVW

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