Woodward

MRI4

     

    Feeder Protection

    Feeder Protection


    The MRI4 is a protection relay which uses the latest Dual-Core-Processor Technology to provide precise and reliable protective functions and is very easy to operate. The MRI4 provides a number of three phase protection elements to safeguard against overcurrent, short-circuit and earth fault, all with inverse time (INV) and definite time (DEFT) tripping characteristics.

    The MRI4 is also ideal for the protection of isolated, resonant, resistive and solidly earthed neutral systems. It is designed to be used in both radial networks and single fed open ring main systems. It can also serve as backup protection for differential protection systems on generators, transformers, bus bars and electrical lines. For overhead line protection the MRI4 is also available with an optional auto-reclosing function.

    The intuitive operating concept with plausibility checks and extensive commissioning functions such as the built-in fault simulator allows a safe and time-optimized maintenance and commissioning. The parameter setting and evaluation software Smart view can be used consistently across the entire family of devices.

    ANSI: 50, 51, 50N, 51N, 46, 49, 60L, 79, 86, 50BF, 74TC

     
    Device MRI4
    Line HighPROTEC
    Binary inputs 8
    Control and detection of switchgears Yes
    Control and supervision of a circuit breaker (remote or local) 1
    Current transformer inputs 4
    Output relays 5
    Watchdog relay 1
    Auto reclosing AR [79] Yes
    Circuit breaker failure protection [50BF] Yes
    Current transformer supervision [60FL] Yes
    Earth fault protection [50N/51N] Yes
    IEC 60870-5-103 Optional
    Inrush stabilisation (2nd harmonic) Yes
    IRIG-B00X Yes
    Modbus (TCP) Optional
    Modbus RTU Protocol Optional
    Motor protection: thermal protection [49] Yes
    Negative sequence protection [46] Yes
    Output relay matrix Yes
    Parameter sets 4
    Profibus DP Optional
    Programmable Logic Yes
    Reset / Blocking Yes
    Resistance earthed / solidly earthed [50N/51N] Yes
    Time Synchronization via SNTP Yes
    Sensitive EF isolated/compensated [50SN/51SN] Yes
    Thermal replica [49] Yes
    Time Date Yes
    Time overcurrent protection [50/51] Yes
    Trip- and auxiliary relays [86] Yes
    Trip circuit resp. control circuit supervision [74TC] Yes
    IEC 61850 Optional
    Time Synchronization via Modbus Yes
    Time Synchronization via IEC 60870-5-103 Yes
    Demand Management Yes
    THD (Todal Harmonic Distortion) Protection Yes
    Disturbance recorder Yes
    Event recorder Yes
    Fault recorder (none volatile) Yes
    Trend recorder Yes
    ANSI: IEC:
    46; I2>
    49; J>,t
    50; I>,I>>
    50BF; CBF
    50N; IE>,IE>>
    51; I>t>, I>>t
    51N; IE>t,IE>>t
    60FL; Yes
    74TC; Yes
    79; AR/AWE
    86; Yes

     

    All shown details without any guarantees!  We reserve the right of changes without prior notice.
    *Only the basic device structure is shown.  Differences in detail are possible.