how set earth fault over current in relay
Answers were Sorted based on User's Feedback
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|
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|
Answer / erharisheee51
we have to connect earth fault relay through current
transformrs , at the neautral side of the generator and
|Is This Answer Correct ?||2 Yes||3 No|
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|
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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