Woodward

MRA4

     

    Directional (Incoming and Outgoing) Feeder Protection

    Directional (Incoming and Outgoing) Feeder Protection


    The directional feeder protection relay MRA4 is a high precision and reliable protection and control relay. The intuitive setting concept with plausibility test enables reliable and time optimized configuration of the extensive protection function to a variety of applications such as incoming or outgoing feeder protection, network protection and generator protection. The implemented switchgear management guaranties an efficient and safe control and supervision.

    The device is a benchmark in flexibility and usability and offers various communication options. The hardware is designed for all nominal values in combination with protection and control functionality.

    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: ANSI: 50, 51, 67, 51C, 51V, 50N, 51N, 67N, 46, 49, 27, 59, 59N, 81U/O, 60FL, 79, 86, 50BF, 74TC , 81R, 78, 47, 60FL, 60L, 32F, 25, 37F, 32Q, 37Q, 37QR, 32S, 37S, 37R, 55, 51C, LVRT , Q->V, UFLS

     
    Device MRA4
    Line HighPROTEC
    Binary inputs 8(+8)
    Control and detection of switchgears Yes
    Control and supervision of a circuit breaker (remote or local) 6
    Current transformer inputs 4
    Output relays 6(+6)
    Voltage transformer inputs 4
    Watchdog relay 1
    Auto reclosing AR [79] Yes
    Circuit breaker failure protection [50BF] Yes
    Current transformer supervision [60FL] Yes
    Directional time overcurrent protection [67] Yes
    Earth fault directional feature [67N] Yes
    Earth fault protection [50N/51N] Yes
    Fault Ride Through (FRT) Yes
    Frequency gradient [81] Yes
    Frequency protection [81O/U] 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
    Phase balance [47] Yes
    Power direction [32/37] Yes
    Profibus DP Optional
    Programmable Logic Yes
    Q->&V< Yes
    Reset / Blocking Yes
    Residual voltage [59N] Yes
    Resistance earthed / solidly earthed [50N/51N] Yes
    Synchrocheck [25] 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
    Vector surge / mains decoupling [78] Yes
    Voltage dependent function Yes
    Voltage protection [27/59] Yes
    Voltage transformer supervision [60FL] Yes
    IEC 61850 Optional
    Intertripping Yes
    Time Synchronization via Modbus Yes
    Time Synchronization via IEC 60870-5-103 Yes
    Voltage Restraint Overcurrent [51V] Yes
    Voltage Restraint Controlled [51C] 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:
    25; Synchro.
    27; U<
    32F/R; Pf>, Pr>
    37; I<t
    46; I2>
    47; (U1<, U2>, U0>)
    49; J>,t
    50; I>,I>>
    50BF; CBF
    50N; IE>,IE>>
    51; I>t>, I>>t
    51N; IE>t,IE>>t
    51Q; I2/I1>
    51V; I>f(U)
    55; PF
    59; U>
    59N; UE>
    60FL; Yes
    67; I> ->, I>> ->
    67N; IE> ->
    74TC; Yes
    78; ΔΘ
    79; AR/AWE
    81 U/O; f<, f>
    81R; ROCOF
    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.