Answer / soleha sarni

EFR is a relay which it sense fault between the phase and earth. the main function of the relay is to operate for the leakage currents to earth. there are two type of earth fault relays:
1. residual current earth fault relay
2. sensitive earth fault relay

Answer / arpan goswami

earth fault relay dense the fault if any leakage current
flow through the ground then it send signal to the circuit
breaker and it will automatically shut-down the equipments

Answer / ravi kolhe

An earth fault relay is activated by the fault current flowing from line to earth. Earth fault relay continuously measure the current.

Answer / bramananthan

Whenever the unbalanced current flow in the circuit the connected EFR sense that current and giving signal to the UV or shunt coil which is placed in the breaker.At that instant the breaker comes to Trip & break the supply.

Answer / ravi sharma

i disagree with all of you

Answer / irfan

Dear friends EFR and ELCB (Earth leakage circuit breaker) function is same but EFR is used to protect the heavy load or Transformer and ELCB is used for to protect the small load such as domestic load . if any mu friend is disagree with me please point out my fault thanks.

Answer / pradhumn singh

It is a relay which sense the fault phase to earth .

Answer / bhupatmeer

Earth fault relay is a relay which is sense a fault between earth and phase.

how many types in CT & define it ?

6 Answers  

why names such like dog ,rabbit, osprey,ant are used for conductors.

1 Answers  

How much is the starting current for HPMV lamps. How many lamps can u wire in a circuit

1 Answers   Technip,

I need the proper answer on :- What is the Earthing Value as per the standard for Raw power and UPS Pit and in panel /DB N-E value ???

2 Answers  

What is the kiosk parts, about them and their functions ? If anybody have some PDFs files or details about this plz send it on tawhidfaisal@Yahoo.com

0 Answers  

for opening electrical shop, tips needed.

0 Answers  

can anybody send me syllabus of rrb section engg (electrical). and also send previous question pepar...

0 Answers   GKB,

what happen if we give 220 volts dc supply to d bulb r tube light?

4 Answers   Genus, RMSI,

What is the types of HT motor testing

0 Answers   ABB,

what kinds of Transformer oil grade is better for power transformer ?

0 Answers   KSRM Steel Plant,

how encoder works?

1 Answers   ITC Infotech,

what is electrical?

15 Answers