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Question
How the earth fault relay works please explain?????????
 Question Submitted By :: Electrical-Engineering
I also faced this Question!!     Answer Posted By  
 
Answer
# 1
When a fault occurs, a current flows in th secondary winding
of th current transformer.
If th current is greater than th setting of th relay, th
electromagnet is energised and attracts th armature.
The action of th armature closes and opens th normally open
and close contacts respectively, thereby closing or opening
th trip circuit.
The shunt trip coil or UV trip coil is energised or
de-energised and th circuit breaker will trip.
 
Is This Answer Correct ?    12 Yes 6 No
Greenhat25
 
Answer
# 2
In continuation to above answer, there are different
schemes to detect earth fault in the system
1. By using residual connections of three phases CTs
2. By using CBCT
3. By using a neutral CT at transformer neutral point.
 
Is This Answer Correct ?    4 Yes 2 No
Avd
 
 
 

 
 
 
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Hi frnds :) plz tell me that i have 100 KVA 3 phase generator so by thumb rule 100*1.4 = 144 amps and generaly we can operate at 80% load...so it will 144*0.8 =112 amps.... so now i m confused about single phase load.....if we use that generator only for single phase the that 112 amps is total single phase load or i can give 112 amps at red 112 amps at yellow and 112 amps at blue.... i mean that total single phase load that 100 KVA generator will take is 112+112+112=336 amp ?? FWO 2
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