M-3425A

Generator Protection System

Integrated Protection System for Generators of All Sizes


M-3425A

The Integrated Protection System
M-3425A provides protection, control, monitoring and user interface functions for generator protection. Stored targets and oscillography can be IRIG-B synchronized. Dual RS-232 ports and an RS-485 port provide user-interface communication capabilities. The M-3820D IPScom Communications Software is included for direct serial or remote communication access. Waveform data can be downloaded using the M-3801D IPSplot PLUS Oscillograph Analysis Software which allows for plotting and printing of the downloaded oscillographic data.

  • Exceeds IEEE C37.102 and Standard 242 requirements for generator protection

  • Protects generators of any prime mover, grounding and connection type

  • Provides all major protective functions for generator protection including:
    • Out-of-Step (78)
    • Split-Phase Differential (50DT)
    • Under Frequency Time Accumulation (81A)
    • Inadvertent Energizing (50/27)
    • Turn-to-Turn Fault (59X)

  • Expanded IPScom® Communications Software provides simple and logical setting and programming, including logic schemes

  • Simple application with Base and Comprehensive protection packages

  • Load encroachment blinders and power swing blocking for system backup protection (21) to enhance security during system abnormal conditions

  • Options:
    • Ethernet Connection
    • Field Ground/Brush Lift-Off Protection (64F/B)
    • Sync Check (25)
    • 100% Stator Ground Fault Protection by low frequency injection (64S)
    • Expanded I/O (15 additional Output Contacts and 8 additional Control/Status Inputs)

  • Configuration Options:

    The M-3425A Generator Protection Relay is available in either a Base or Comprehensive package of protective functions. This provides the user with flexibility in selecting a protective system to best suit the application. Additional Optional Protective Functions may be added at the time of purchase at per-function pricing. The Human-Machine Interface (HMI) Module, Target Module, or redundant power supply can be selected at time of purchase. When the Field Ground (64F) Premium Protective Function is purchased, an external coupler module (M-3921) is provided for isolation from the dc field voltages. When 100% Stator Ground (64S) protection using low-frequency injection is purchased, an external band pass filter and frequency generator is provided.

  • Protective Functions

    Base Package
    • Overexcitation (V/Hz) (24)
    • Phase Undervoltage (27)
    • Directional power sensitive triple-setpoint Reverse Power, Low Forward Power or Overpower detection, one of which can be used for sequential tripping (32)
    • Dual-zone, offset-mho Loss of Field (40), which may be applied with undervoltage controlled accelerated tripping
    • Sensitive Negative Sequence Overcurrent protection and alarm (46)
    • Instantaneous Phase Overcurrent (50)
    • Inadvertent Energizing (50/27)
    • Generator Breaker Failure (50BF)
    • Instantaneous Neutral Overcurrent (50N)
    • Inverse Time Neutral Overcurrent (51N)
    • Three-phase Inverse Time Overcurrent (51V) with voltage control and voltage restraint.
    • Phase Overvoltage (59)
    • Neutral Overvoltage (59N)
    • Multi-purpose Overvoltage (59X)
    • VT Fuse-Loss Detection and blocking (60FL)
    • Residual Directional Overcurrent (67N)
    • Four-step Over/Underfrequency (81)
    • Phase Differential Current (87)
    • Ground (zero sequence) Differential Current (87GD)
    • IPSlogic takes the contact input status and function status and generates outputs by employing (OR, AND, and NOT) boolean logic and a timer.

  • Protective Functions

    Comprehensive Package
    The Comprehensive Package includes all Base Package functions, as well as the following:
    • Three-zone Phase Distance protection for phase fault backup protection (21). Zone three can be used for Out-of-Step Blocking. Load encroachment blinders can be applied.
    • 100% Stator Ground Fault protection using Third Harmonic Neutral Undervoltage (27TN) or (59D) Third Harmonic Voltage Differential (ratio)
    • Stator Overload (49) (Positive Sequence Overcurrent)
    • Definite Time Overcurrent (50DT) can be used for split phase differential
    • Out-of-Step (78)
    • UnderFrequency Accumulation (81A)
    • Rate of Change of Frequency (81R)

  • Optional Protective Functions
    • Sync Check with Phase Angle, ΔV and ΔF with dead line/dead bus options (25)
    • Field Ground (64F) and Brush Lift Off (64B) (Includes M-3921 Field Ground Coupler)
    • 100% Stator Ground protection by low frequency injection (64S). The following equipment is required with the 64S option:
      • 20 Hz signal generator (430-00426)
      • Band-pass Filter (430-00427)
      • 400/5 A 20 Hz CT (430-00428)

  • Standard Features
    • Eight programmable outputs and six programmable inputs
    • Oscillographic recording with COMTRADE or BECO format
    • Time-stamped target storage for 32 events
    • Metering of all measured parameters and calculated values
    • Three communications ports (two RS-232 and one RS-485)
    • M-3820D IPScom® Communications Software
    • Includes MODBUS and BECO 2200 protocols
    • Standard 19" rack-mount design (vertical mounting available)
    • Removable printed circuit board and power supply
    • 50 and 60 Hz models available
    • Both 1A and 5 A rated CT inputs available
    • Additional trip inputs for externally connected devices
    • IRIG-B time synchronization
    • Operating Temperature: –20° C to +70° C
    • Sequence of Events Log
    • Trip Circuit Monitoring
    • Breaker Monitoring
    • Four Setpoint Groups

  • Optional Features
    • Redundant power supply
    • M-3925A Target Module
    • M-3931 Human-Machine Interface (HMI) Module
    • RJ45 Ethernet port utilizing MODBUS over TCP/IP and BECO2200 over TCP/IP protocols
    • RJ45 Ethernet port utilizing IEC 61850 Protocol
    • M-3801D IPSplot® PLUS Oscillograph Analysis Software
    • Expanded I/O (15 additional outputs and 8 additional inputs)
    • Standard and Expanded I/O Models available in vertical panel mount

 

Sales and Service

Specification subject to change without notice.