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In the UK, the letters, 'R-Y-B', stand for 'red-yellow-blue' which are the colours used to identify the lines (not phases) of a three-phase transmission or distribution cable. The colours are also used, in some cases, to identify the corresponding bushings for Transformers, circuit breakers, voltage transformers (potential transformers), etc., in substations. The sequence of these letters/colours also correspond to the normal phase sequence of the three-phase system.
In UK residential, commercial, and industrial installations, these colours have now been replaced by the EU harmonisation colours: brown-black-grey.
Other countries use different methods of identifying line conductors, including 1-2-3, A-B-C, R-S-T, L1-L2-L3, etc., or various combinations of these methods.
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How do you reverse a direction of a slip ring motor?
It is very simple. Just interchange any two phase wires. i.e. Y and B ( or ) R and B ( or ) R and Y for example Stop the supply. keep R phase wire as it is and disconnect B phase wire and Y phase wire. Connect B phase wire to the Y phase motor stud and Y phase wire to the B phase motor stud. Now give the supply, now motor revolves in opposite direction to the earlier.
What are the wire colors for 3 phase 440 vac?
R - Red Y - Yellow B - Blue
Why Y phase is high in YNyn0 when doing magnetic balance test?
because y phase is y phase ...it is not b phase or R phase so it is high
Wave forms of 3 phase fully controlled rectifier for RL load?
for 3 phase r l load phase control rectifier what is the avg value?
What is ammeter selector switch?
A selector switch is normally used in a place to avoid 3 ammeters usage and instead measuring current in all the 3 phases using 1 ammeter only. Motto: SAVE MONEY.. :D The selector switch provided for ammeter is to check the amount of current taken from each phase supply. (ie) R,Y and B. Each phase supply should be covered with a current transformer with the rated amps capacities. The two leads of the the each phase CT are connected to the respective leads in the selector switch of the ammeter.
What is the difference between positive sequence and negative sequence arrangement?
The order in which the voltage of the coil reaches to the maximum value is called the Phase Sequence.POSITIVE PHASE SEQUENCE: If the coil is rotated in anticlockwise direction, the phase sequence will be Positive Phase Sequence, i.e., R-Y-B or A-B-C.NEGATIVE PHASE SEQUENCE: If the coil is rotated in clockwise direction, the phase sequence is called Negative Phase Sequence, i.e., R-B-Y or A-C-B.NOTE: Phase Sequence is of great importance in parallel operation of three phase transformers and alternators.
How do you reverse a direction of a slip ring motor?
It is very simple. Just interchange any two phase wires. i.e. Y and B ( or ) R and B ( or ) R and Y for example Stop the supply. keep R phase wire as it is and disconnect B phase wire and Y phase wire. Connect B phase wire to the Y phase motor stud and Y phase wire to the B phase motor stud. Now give the supply, now motor revolves in opposite direction to the earlier.
What are the wire colors for 3 phase 440 vac?
R - Red Y - Yellow B - Blue
How a 3 phase generator work?
For information about three phase electrical services see the answers to the Related Questions shown below.
Why Y phase is high in YNyn0 when doing magnetic balance test?
because y phase is y phase ...it is not b phase or R phase so it is high
Why 3 phase motor rotate in opposite direction?
You would reverse rotation on a 3 phase motor to get it to run backwards. Say I fill up a tank truck from a lake. I turn on my generator. I run the motor in one direction. Then I drive the tank truck and the motor to a different location. Then I turn on my generator. I attach the hose to the motor on tank truck. I throw the switch to make the motor run backwards. I aim the hose at the fire in your house. Aren't you glad that I can make my 3 phase motor run backwards?
Wave forms of 3 phase fully controlled rectifier for RL load?
for 3 phase r l load phase control rectifier what is the avg value?
Why is the R-C oscillator also called a phase shift oscillator?
The R-C oscillator is also called a phase shift oscillator because the R-C filter creates a phase shift from input to output. The feedback portion of the oscillator (an amplifier) then serves to pump energy back into the filter.
Where is R and B singers TROOP?
The R and B singers troop are from a place in California called Pasadena.
How is r and b and rap alike?
most words that start with b and r have 3 letters.
What if you have a negative kvar in transmission line what will happens?
the phase angle changes in R Y B lines
What does R.S.T means for 3 phase electrical connections?
To identify the phases of o 3-phase system, we give to each of them a name, such as A-B-C, or R-S-T, or R-Y-B (in this case, red-yellow-blue, if we assign a color to each phase, for easy visual identificantion).Answer'R-S-T' was a German standard used to identify each of the three lines (not 'phases', as indicated in the original answer) of a three-phase system. Other countries use different standards, including A-B-C, 1-2-3, red-yellow-blue, and blue-black-grey.
