M-3311 Transformer Protection System

 

M3311 A Transformer protection BeckwithM3311 A Transformer protection Beckwith connection Transformer

 

    • For Transformers of All Sizes:
      • 2 or 3 winding Transformers
      • Unit Wrapping of Generating Plants
      • Unit Protection of Other Electrical Apparatus and certain Bus Arrangements (including those with a transformer in the zone)
    • Additional Applications: System Backup Protection, Load Shedding (voltage and frequency), Bus Protection, and individual Breaker Failure Protection for each winding input

    Standard Protective Functions

    • Negative-sequence inverse time overcurrent (46)
    • Winding thermal protection (49)
    • Three winding instantaneous phase overcurrent (50)
    • Breaker Failure (50BF)
    • Instantaneous ground overcurrent (50G)
    • Instantaneous residual overcurrent (50N)
    • Three winding inverse time phase overcurrent (51)
    • Inverse time ground overcurrent (51G)
    • Inverse time residual overcurrent (51N)
    • Three winding, phase differential (87T) and High Set instantaneous (87H)
    • Ground differential (87GD)
    • Six External input functions with individual timers

    Optional Single‑Phase Voltage Protection Package

    • Overexcitation (24) V/Hz, two definite time and one inverse time elements
    • Phase undervoltage (27) function for load shedding
    • Ground Overvoltage (59G)
    • Over/Underfrequency (81O/U)

    Standard Features

    • Four Setpoint Groups
    • Eight programmable outputs and six programmable inputs
    • Oscillographic recording
    • 32-target storage
    • Real time metering of measured and calculated parameters, including demand currents
    • Two RS-232 and one RS-485 communications ports
    • Standard 19″ rack-mount design
    • Removable printed circuit board and power supply
    • 50 and 60 Hz models available
    • 1 or 5 A rated CT inputs available
    • M-3820B IPScom® Communications Software
    • IRIG-B time synchronization
    • Includes MODBUS, BECO 2200 and DNP 3.0 protocols

    Optional Features

    • Redundant Power Supply
    • M-3911 Target Module
    • M-3931 Human-Machine Interface (HMI) Module
    • M-3801D IPSplot® PLUS Oscillograph Analysis Software

 

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