What is difference between earth leakage relay and
restricted earth fault relay ?
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Answer Posted / pratheesh
REF detects the earth faults between the transformer
secondary winding and upto the point where REF
protection CT placed. If any earth fault occurs within
this zone, REF relay will sense it.
It will not trip when any faults occurs after the
protected zone(after the REF CTs) as the earth fault
current produced in the secondaries of the REF CTs and
the Neutral Earthing CT is neutralized.
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