750 Feeder Management Relay

The 750/760 Feeder Management Relay is a digital relay intended for the management and primary protection of distribution feeders. It can also be used for management and backup protection of busses, transformers, and power lines. The relay tracks the power system frequency and adjusts the sampling rate to maintain accuracy at all times.

New in SR750/760:

  • New Quick-Start manual

  • Improved Conformal Coating for Harsh (Chemical) Environments

  • 10BaseT Ethernet Port allow for direct connectivity to 10 Mbps Ethernet Local/Wide Area Networks

  • Expanded sequence of event recorder - 512 time stamped events

  • Expanded Waveform capture - 2 to 16 events with 4096 to 512 samples of data respectively

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  • New Harsh Environment Conformal Coating option. View More Info...


    • Features and Benefits


  • Unique built-in control features - Comprehensive feeder protection plus automatic Transfer Scheme, Under Voltage and Under Frequency auto-restore

  • Best in class man machine interface (MMI) - Large backlit display with 40 characters to view relay information and settings in direct sunlight, full numerical keypad, and setpoint navigation keys.

  • Accurate metering under sever system disturbances - Tracks power system frequency and adjusts sampling rate accordingly

  • Minimize replacement time - Draw-out construction

  • Improve uptime of auxiliary equipment - Through I/O monitoring

  • Reduce troubleshooting time and maintenance costs - IRIG-B time synchronization, event reports, waveform capture, data logger

  • Simplify testing - Built in simulation features

  • Cost Effective Access information - Via Modbus RTU and DNP 3.0 Level 2 protocols, through standard RS232, RS485 & RS422 serial ports, and optional Modbus? TCP/IP through embedded Ethernet Port to connect to 10Mbps Ethernet local or wide area networks.

  • Complete asset monitoring - Analog I/O, Full metering including demand & energy

  • Follow technology evolution - Flash memory for product field upgrade

  • Long lasting life - When exposed to chemically corrosive and humid environments with optional conformal coating


    • Applications


  • Management and primary protection of distribution feeders

  • Management and backup protection of busses, transformers and power lines

  • Reliable Distributed Generation interconnection protection system.


    • Protection and Control


  • Complete time, instantaneous & directional phase, neutral, ground and negative sequence overcurrent

  • Time, instantaneous & directional sensitive ground overcurrent

  • Voltage restraint overcurrent

  • Bus phase and line auxiliary undervoltage

  • Bus phase overvoltage

  • Neutral overvoltage

  • Negative sequence voltage

  • Undervoltage automatic restoration

  • Bus underfrequency

  • Underfrequency automatic restoration

  • Automatic bus transfer

  • Breaker failure

  • Manual close control

  • Cold load pickup control

  • Power factor control

  • 4 shot recloser

  • 4 setting groups

  • Syncrocheck - V, f, Hz, & dead-source

  • 20 Programmable logic inputs


    • Monitoring and Metering


  • Fault locator, record of last 10

  • Breaker operation & trip failure

  • VT Failure

  • Power factor - two independent stages

  • Analog input - level and rate

  • Total breaker arcing current

  • Event recorder

  • Oscillography and Data Logger

  • Metering: V I Hz W var VA PF

  • Demand: Ia , Ib , Ic , MW, Mvar, MVA


    • User Interface


  • Front Panel LEDs, full key pad, and backlit LCD display

  • RS232, RS485 and RS422 ports - up to 19,200 bps

  • Ethernet port - 10Mbps

  • Multiple protocols - ModBus™ RTU, ModBus™ TCP/IP, DNP 3.0 Level 2

  • Includes EnerVista software