RELAY > Earth Fault Relay

  • Microprocessor Based Digital EFR, 5%-80%

    Model No : MPEFSPL-01

    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.

  • Microprocessor Based Digital EFR - DIN, 5%-80%

    Model No : DMPEFSPL-01

    The unit has LCD for displaying the fault current (at the time of tripping) and setting
    values (curves, plug setting & TMS). The LEDs are provided for indicating power ON status
    and to indicate IDMT or DEFINITE TIME or INSTANTANEOUS mode operation. Key pads are
    provided for easy setting/changing of the parameters.The design is tropicalised and
    rugged.

  • Microprocessor Based Static EFR, 5%-80%

    Model No : EFSPL-01

    Prok dv’s make Definite Time / Instantaneous Static Earth Fault Relay (EFR) is a current sensing device which is tropicalised, professionally designed and tested for protection of Generators, Transformers and Feeders. Prok dv’s make Static 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.

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