Answer / s.patel

There is no condition like that ,we can connect earth fault relay to any one of the R,Y&B phases ..

Answer / k.prakashchandra

Earth fault relay is not connected any phase.The balancing
current is made to pass through this relay.In two EFR and
one EFR protection scheme,OCR s are usually provided on R
and B phases ,which makes one assume that the EFR is
provided on Y phase.You can have 3 OCR and 1 EFR protection
scheme also

Answer / k.prakashchandra

It may be noted that EFR is connected between the star
points formed by S1s and S2s of CT secondaries.

Answer / k.prakashchandra

In my answer No.2 pl read as 2OCR and 1 EFR

what is oti and wti

3 Answers   Jindal,

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IS HI-POT TEST DONE ON A TRANSFORMER - YES OR NO? WHY?

4 Answers  

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how to find insulation resistance of a motor(415v) by theoretical formula??

2 Answers  

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How to calculate no of EARTH PIT? Describe the formula as per IS standard?

0 Answers  

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Why field rheostat is kept in minimum position while armature rheostat at maximum position?

0 Answers  

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What is line resistance of cable & how it can be measured ?

0 Answers  

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How to measure power in 2 or 4 or n phase circuit? Please give me a formula.

0 Answers  

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can we use only a isolator in the subtation..

1 Answers   ABB,

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what is the use of CAPACITOR in CFL lamp?

6 Answers   Areva, Autopal,

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What is mean by staling?

2 Answers   UPPCL,

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Where we use 30mA , 100mA & 300mA RCCB ?

3 Answers   BEL,

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expansion of rccb

3 Answers  

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