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489 Generator Protection System

The SR489 Generator Protection System, a member of the SR family of relays, provides protection, control and advanced communications in a cost effective industry leading draw-out construction. Designed for small and medium sized generators, the 489 delivers advanced protection including generator stator differential protection. The 489 also includes detailed diagnostic information allowing for reduced troubleshooting time.

Key Benefits

  • Complete, secure protection of small to medium sized generators
  • Easy to use generator protection supported by industry leading software tools.
  • Advanced protection and monitoring features including the use of RTDs for stator and bearing thermal protection and Analog Inputs for vibration monitoring
  • Draw-out construction allowing for minimized downtime and easy removal/installation of the 489 during maintenance routines
  • Large, user-friendly front panel interface
  • Enhanced generator troubleshooting through the use of IRIG-B time synchronized event records, waveform capturing, and data loggers
  • Simplified setpoint verification testing using built in waveform simulation functionality
  • Cost effective communication through industry standard hardware (RS232, RS485, 10BaseT Ethernet) and protocols (Modbus RTU, Modbus TCP/IP, DNP 3.0)
  • Harsh Chemical Environment Option
  • Synchronous or induction generators
    operating at 25Hz, 50Hz or 60Hz
  • Primary or backup protection in cogeneration applications

  Key Features    
  • Generator stator differential
  • 100% stator ground
  • Loss of excitation
  • Distance backup
  • Reverse power (anti-motoring)
  • Overexcitation
  • Ground directional overcurrent
  • Inadvertent energization
  • Breaker failure
  • Stator and bearing thermal monitoring
  • Stator and bearing vibration monitoring
  • Negative sequence overcurrent
  •   Protection & Control
      The 489 Generator Protection System provides comprehensive protection, metering, and monitoring of small to medium sized synchronous or induction generators operating at 25, 50 or 60 Hz. The 489 is ideally suited for primary or backup generator protection as well as for use in cogeneration applications. Protection features found in the 489 include:
    489 Block Diagram
      Key Features
  • Metering – current, voltage, power, Energy, frequency, power factor
  • Demand – current, watts, vars, VA
  • Temperature – 12 RTD inputs
  • Vibration and Speed – 4 analog transducer inputs
  • Expanded sequence of event recorder - 256 time stamped events
  • Oscillography – 12 samples/ cycle up to 128 cycles in length
  • Trending – 8 parameters with up to a 5 second sample rate
    Analyze generator faults using waveforms that are captured at the time of generator faults or system instabilities
    The 489 offers a multitude of different analog and digital inputs and outputs to allow the 489 to be seamlessly integrated into most generator automation schemes.

    Outputs Relays
    The 489 provides six output contacts for the purpose of controlling or signaling other devices and operations personnel. Protection elements can be configured to control the Trip contact, the Alarm contact, or the 3 Auxiliary contacts whenever the element operates. The status of each of these contact are also displayed on LEDs found on the relays front panel.

    Digital Inputs
    Eight digital inputs are available for monitoring the status of external contacts, tachometers, or control switches. With these inputs, the relay can identify the status of the associated breakers and receive commands from operational staff such as controlling the output relays, resetting the thermal limits, or triggering a waveform capture.

    RTD Inputs
    Twelve RTD inputs allow the 489 to monitor both the generator stator and bearing temperature. A built in voting feature adds additional security by ensuring that two RTDs monitoring the same device both detect the overtemperature condition before tripping the generator offline.

    Analog Inputs
    Four analog inputs are available for providing protection and monitoring of generator bearing vibration. The analog inputs are field programmable to measure transducer signals that operator over a range of 0 to 1 mA, 0 to 20 mA, or 4 to 20 mA.

    Analog Outputs
    Four analog outputs are available for signaling the value of measured analog quantities to external process control devices such as PLCs. The analog outputs can be ordered to operate over a 4 to 20mA range or a 0 to 1mA range and can be configured to signal a representation of most analog quantities measured by the 489 including currents, voltages, frequency,
      Key Features
  • Networking interfaces - RS232, RS485, 10Mbps copper Ethernet
  • Multiple protocols - ModBus™ RTU, ModBus™ TCP/IP, DNP 3.0 Level 2
  • Embedded Ethernet - Direct connection to Ethernet Local/Wide Area Networks (LAN/WAN) supporting baud
    rates of up to 10Mbps, using Modbus TCP/IP protocol, via an RJ45 port located on the back panel of the relay
    The 489 provides advanced communications technologies for remote data and engineering access, making it easy and flexible to use and integrate into new or existing monitoring and control systems. Multiple communication ports are available including a front panel RS232 serial port for easy local computer access, two RS485 serial ports and a 10Mbps copper Ethernet port that provide direct integration in most communications architectures.

    The 489 supports the most popular industry standard protocols enabling easy, direct integration into most DCS and SCADA systems. Protocols supported include:
  • Modbus RTU, Modbus TCP/IP
  • DNP 3.0
    The EnerVista™ Suite is an industry-leading set of software programs that simplify every aspect of using the 489 relay. The EnerVista™ suite provides all the tools to monitor the status of your protected asset, maintain the relay and integrate information measured by the 489 into DCS or SCADA monitoring systems. Convenient COMTRADE and Sequence of Events viewers are an integral part of the 489 Setup software included with every relay to carry out post-mortem event analysis. Learn More