Answer Posted / p c sahu

Under normal conditions and by application of
Kirchhoff’s laws the sum of currents in both current
transformers (CTs) equals zero. If there is an earth
fault between the CTs then some current will bypass the
CT's and the sum of currents will not be zero. By
measuring this current imbalance faults between the CTs can
be easily identified and quickly cleared. Fault detection
is confined to the zone between the two CTs hence the
name 'Restricted Earth Fault'
An earth leakage relay will sense and trip the circuit for
any earth leakage fault that may occur any where in the
system. The C.T provided at the neutral bus is used for
sensing this fault

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