What is the difference between earth fault and restricted
earth fault protection?
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Answer Posted / m.gopinath
Earth fault protection is non-unit protection for earth
faults where as restricted earth fault protection is a unit
protection (ie differential protection of Y connected
alternator/transformer) for earth faults. So we can say the
Restricted earth fault protection is differential
protection of a y connected winding for earth faults only
but not for phase-to-phase faults.
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