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

When we use a multimeter, while checking continuity of a closed circuit , what is happening inside multimeter, how it is working to produce a beep wheather it is closed or open.. is there any internaly voltage/current source inside multimeter?

3 Answers   TNEB Tamil Nadu Electricity Board,

---

why we provided electrical earthing?

5 Answers   CPCL,

---

how to calculate the cable size for LT and HT power cables with detail explanation?

2 Answers   Asset Developments, Bhel,

---

HOW DOES THE FAN REGULATOR CONTROLS ITS SPEED

6 Answers  

---

Is VVVFD reduced the starting current of an induction motor?

1 Answers  

---

---

what is B , c & d curves in MCB characteristics i e Full Form of B , C & D . sir please give me answer

1 Answers   NCC,

---

what is armature reaction?explain in simple words?and what is its infleunce on dc motor

16 Answers  

---

From stability point of view,What(higher/lower) should be the value of inertia constant of rotating machines?

1 Answers  

---

As per BIS, Earth pit resistence value?

4 Answers  

---

if a damaged 500kva transformer with %impedance 2.6 is replaced by two transformers of 250Kva with different % impedance will they be able to catter the load. what will be the ratio of load on the two transformers if the % impedance is in the ratio 1:2

2 Answers   Siemens,

---

How to test the vector group of a Yd11 transformer? what are the relations to be checked between various vectors to confirm this vector group?

0 Answers  

---

how to calculate the size of cable for 100 kva load,?can somebody tell me with a formula

7 Answers   Havells,

---