how set earth fault over current in relay

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how set earth fault over current in relay..

Answer / kiran sule

In any relay Set earth fault to minimum That means If Earth
fault range is 20 to 80 % of secondary current then set it
to 20% . In case of over current calculate rated current
and add 5%for relay & ct error and 5% to over load that
means set it to 110% to full load capacity.
If for 200/1 CT If full load current is 160 that mens 80%
to secondary current of Ct+10% relay CT error and Over load
that means relay ia seted to 180A interms of secondary at
0.9 a that means 90%

Is This Answer Correct ?

19 Yes

2 No

how set earth fault over current in relay..

Answer / vijay raskar

When earth fault is occured then relay is set at 2.5 times
than rated current.

Is This Answer Correct ?

7 Yes

8 No

how set earth fault over current in relay..

Answer / erharisheee51

we have to connect earth fault relay through current
transformrs , at the neautral side of the generator and
transformers.

Is This Answer Correct ?

2 Yes

3 No

how set earth fault over current in relay..

Answer / j.kesavan

POWER CIRCUITE R,Y,B PHASE USING THREE CT ,THIS CT OUT PUT
CONNECT IN OVER CURRENT AND EARTH FAULT RELAY , IF ANY ONE
PHASE TAKE MORE CURRENT OR EARTH FAULT THIS RELAY WILL
TRIP.SETTING THIS RELAY MINIMUM CURRENT,MINIMUM DELAY.

Is This Answer Correct ?

2 Yes

5 No

how set earth fault over current in relay..

Answer / motilal sahu

WHEN EARTH FAULT OCCURE HIGH CURRENT FLOW THOUGH LINE.

IF THIS CURRENT IS 10-115 TIMES OF FULL LOAD CURRENT THEN
SHOW THAT EARTH FAULT OCCURE
SO SET THE RELAY FOR 10-15TIME OF FULL LOAD CURRENT

Is This Answer Correct ?

6 Yes

10 No

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