Earth Fault Relay

PROK DEVICES PVT LTD an ISO 9001-2008 company introduces DIGITAL
MICROPROCESSOR / MICROCONTROLLER BASED IDMT / DEFINITE TIME / INSTANTANEOUS
EARTH FAULT RELAY (EFR).It is a current sensing device which is tropicalised professionally
designed and tested for protection of Generators, Transformers and Feeders. Prok dv's
make DIGITAL MICROPROCESSOR / MICROCONTROLLER BASED IDMT / DEFINITE TIME /
INSTANTANEOUS EARTH FAULT RELAY (EFR) can be employed with various earth fault protective
schemes, which are explained in brief with figures. The magnitude of the earth fault current
depends on the fault impedance and invariably the fault impedance for earth fault is
higher than that for phase faults, hence the earth fault current is low compared to the
phase fault currents. The fault impedance depends on the system parameter and also on
type of earthing. The neutral may be solidly grounded, grounded through resistance or
reactance.