GE Digital Energy SR Protection Relay Family

$1.00

  • SR750/760 – Easy to use Feeder Protection System supported by industry leading suite of software tools. Suitable for Bus blocking/Interlocking schemes; High-speed fault detection for arc flash mitigation; Throw over schemes (bus transfer scheme applications); Load shedding schemes based on voltage and frequency elements; Auto-Recloser (760 Only)
  • SR469 – Protection and Management of three phase medium and large horsepower motors and driven equipment, including high inertia, two speed and reduced-voltage start motors. Voltage dependant overload curves; Torque metering and protection, broken rotor bar protection; Most advanced thermal model – Including multiple RTD inputs for stator thermal protection
  • SR745 – Primary and back-up protection and management of small, medium and larger power transformers, auto-transformers and reactors: Variable dual-slope percent differential protection, Magnetizing inrush and over-excitation blocking, ROCOF detection, Over-excitation   (V/Hz) Protection, Restricted Ground Fault Protection, Transformer overload protection
  • SR489 – Application for  Synchronous or induction generators operating at 25Hz, 50Hz or 60Hz; Primary or backup protection in cogeneration applications: Generator stator differential, Distance backup, Reverse power , Loss/Over excitation, Inadvertent energisation, Negative sequence overcurrent, Stator and bearing thermal monitoring
  • Reduce troubleshooting time and maintenance costs -IRIG-B time synchronization, event reports, waveform capture, data logger
  • Draw-out construction allowing for minimized downtime and easy removal/installation
  • Multiple Networking interfaces – 10baseT Ethernet, RS485, RS232, RS422 (not 489); Multiple Protocols – Modbus RTU, Modbus TCP/IP, DNP 3.0 (not 469), DeviceNet (469 only)
  • Multiple Protocols – Modbus RTU, Modbus TCP/IP, DNP 3.0 (not 469), DeviceNet (469 only)
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Description


Multilin 750/760 Feeder Protection System

Comprehensive, draw out distribution feeder protection and management.

 

The 750/760 Feeder Protection System, a member of the SR Family of protection relays, with draw out capability intended for primary protection and management of distribution feeders. The 750/760 has specific features for industrial environments, including a drawout case to limit downtime during maintenance and conformal coating for harsh environments.

 

Key Benefits

      • Easy to use Feeder Protection supported by industry leading suite of software
      • Accurate built-in metering functions
      • I/O monitoring – improve equipment uptime
      • IRIG-B time synchronization, event reports, waveform capture, data logger
      • Minimize replacement time – Draw-out construction
      • Simplify testing – Built in simulation features
      • Supports industry protocols such as DNP & Modbus
      • Optional 10MB Ethernet port
      • Complete monitoring – Analog I/O, Full metering
      • Leading edge technology – Flash memory for product field upgrade
      • Optional conformal coating for Harsh Environments

Applications

      • Primary protection and control for distribution feeders on solidly grounded, high impedance grounded or resonant grounded systems
      • Bus blocking/Interlocking schemes
      • High-speed fault detection for arc flash
      • Throw over schemes (bus transfer scheme)
      • Load shedding schemes based on voltage and frequency elements
      • Back-up protection for transmission lines, feeders and transformers
      • Distributed Generation (DG) interconnect protection

The feeder management relay shall provide primary protection and management of distribution feeders. Protection shall include:

      • Complete time overcurrent (51P, 51N, 51G), including sensitive ground
      • Complete instantaneous overcurrent (50P, 50N, 50G), including sensitive ground
      • Directional overcurrent (67P, 67N, 67G, 67_2)
      • Bus and Line undervoltage and overvoltage (27/59)
      • Negative sequence voltage (47)
      • Undervoltage automatic restoration (27/79)
      • Bus under-frequency (81U) with voltage and current level monitoring
      • Bus over-frequency (81O) with voltage and current level monitoring
      • Frequency rate-of-change (81D) monitoring
      • Under-frequency automatic restoration (81/79)

 

      • Neutral displacement overvoltage (59N) used to give line to ground fault coverage on high impedance grounded or ungrounded systems, which are isolated.

The relay shall have a drawout construction to facilitate testing, maintenance and interchange flexibility.

The relay shall operate with either wye-connected (four wire) or open-delta-connected (three wire) potential transformers, and three phase, four wire connected current transformers.

Download full specifications

Brochure

 

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