WHY IS RESTRICTED EARTH FUALT PROTECTION NEEDED?? WHY CANT
DEIFFERENTIAL PROTECTION SUFFICE???
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Answer Posted / jwalant yogi
First of all, REF protection is used for the case of
internal faults of the transfomer.Secondly, in REF, usually
when the current flows back form the neutral to the source,
there is much larger current change in the neutral current
as compared to the phase currents.And Differential
protection usually works senses the changes in the phase
currents which is not much larger, that's why differential
protection and REF protection are totally different from
each other.each of them is having different significance
and used for a particular application.
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