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Question
why we use RYB phase sequence? and somewhere we use UVW ? 
why?
 Question Submitted By :: Electrical-Engineering
I also faced this Question!!     Answer Posted By  
 
Answer
# 1
In 3 phase ac systems, as the name depicts, there has to be
3 phases and these 3 phases are named as RYB according to
some international standards. Practically when we see the
three phases we will not be able to distinguish between the
3 phases & so they r coloured Red, Yellow & Blue to help us
identify the required phase.
A RYB transmission line shouldnot be connected to any other
phase sequence like YRB or BRY etc, it has to be connected
with another RYB only otherwise a large circulating current
will flow because of different impedances of different phases.
 
Is This Answer Correct ?    24 Yes 21 No
Roysayan01
 
Answer
# 2
In 3 phase ac systems, as the name depicts, there has to be
3 phases and these 3 phases are named as RYB according to
some international standards. Practically when we see the
three phases we will not be able to distinguish between the
3 phases & so they r coloured Red, Yellow & Blue to help us
identify the required phase.
A RYB transmission line shouldnot be connected to any other
phase sequence like YRB or BRY etc, it has to be connected
with another RYB only otherwise a large circulating current
will flow because of different impedances of different
phases.
 
Is This Answer Correct ?    8 Yes 6 No
Ramesh.e
 
 
 
Answer
# 3
RYB has been used because this is the normal colours of the
3 phases (Red Yellow Blue). Now the international standard
is RWB (Red White Blue) because the earth is Green with an
Yellow stripe. This change is because some colour blind
people will see red as green and green as red when the
colours are together.
UVW is the terminal naming standard.
 
Is This Answer Correct ?    2 Yes 4 No
Kj
 
Answer
# 4
RYB SEQUENCE IS TO DISTNGUISH THE THREE PHASE WIRES...NOW WE R USING U,V,W INSTEAD OF R,Y,W ..THIS IS OUR NEW CONVENTION... 
Is This Answer Correct ?    8 Yes 22 No
Hariprasanna
 

 
 
 
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