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WHY IS RESTRICTED EARTH FUALT PROTECTION NEEDED?? WHY CANT
DEIFFERENTIAL PROTECTION SUFFICE???
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Answer Posted / amit
Restricted earth fault protection is used for zonal
protection for transformer, generator etc. For earth fault
protection we set 10% or 20% earth fault current hence we
leave 10-20% of winding unprotected. By using REF we provide
protection for that remaining portion of winding.
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