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SEL-700G

Generator Protection Relay

The SEL-700G Relay is the right solution for utility and industrial generator protection, with an autosynchronizer, flexible I/O, and advanced communications. Apply the SEL-700G Relay for comprehensive primary and backup generator protection.

The SEL-700G provides a complete protection and synchronization solution for synchronous generators. Eliminate the complexity and cost of standalone synchronizer packages. Integrating the synchronization capability into the generator protection relay provides the most cost-effective and reliable solution. Easily upgrade protection without cutting or drilling existing cutouts with a small form factor and multiple mounting adapters. Quickly integrate into serial- or Ethernet-based communications with Modbus, DNP3, IEC 61850, Mirrored Bits communications, and other protocols.

Starting At

2,500 USD

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Comprehensive Generator Protection—Connect the SEL-700G Generator Protection Relay across small, medium, or large generators for complete primary and backup protection. The SEL-700GT provides an IEEE 1547 compliant intertie protection solution for distributed generation. Adding the neutral voltage connection provides 100 percent stator ground protection, based on third-harmonic voltage measurements. Connecting the neutral current input provides protection for solidly grounded or resistance-grounded machines.

Autosynchronizer—Replace external generator control and synchronizer relays with the built-in automatic synchronizer function. Frequency, voltage, and phase control of the generator are automatically synchronized and connected to the power system. Monitor the generator synchronization process using generator start reports and the PC-based synchroscope.

Current Differential Protection—Apply sensitive percentage-restrained current differential elements and an unrestrained element, along with synchronism check and volts-per-hertz elements, across the entire unit to protect both the generator and the step-up transformer. Optional current differential elements detect stator faults using a secure, sensitive current differential function. Power transformer and CT connection compensation allows the unit step-up transformer to be included in the generator differential zone.

Breaker Wear Monitoring—Record accumulated breaker contact wear with the breaker monitor function, which uses the manufacturer’s specifications for defining breaker operation limits. The internal monitor tracks the total number of close/open operations and integrates the interrupted current per phase. Set an alarm to alert operators when measured and accumulated quantities approach maintenance thresholds. This information facilitates proactive breaker maintenance and replacement without underutilizing resources.

Easy Communications—Choose from single or dual ports, copper or fiber-optic Ethernet or serial communications, and several protocols, including Mirrored Bits communications and IEC 61850. Pick multiple Modbus TCP or Modbus serial sessions for custom configuration of your application. Use DNP3 Serial or DNP3 LAN/WAN protocols.

Overview

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Comprehensive Generator Protection
Numerous current, voltage, frequency, distance, power, and out-of-step elements provide comprehensive protection for large, medium, and small generators.

Autosynchronizer
The optional, built-in automatic synchronizer function eliminates the need for expensive external synchronizer equipment. Frequency, voltage, and phase control of the generator are automatically synchronized and connected to the power system.

Easy Communications
Choose from single or dual ports, copper or fiber-optic Ethernet or serial communications, and several protocols, including Mirrored Bits communications and IEC 61850. Pick multiple Modbus TCP or Modbus serial sessions for custom configuration of your application. Use DNP3 serial or DNP3 LAN/WAN protocol.

One Hundred Percent Stator Ground Detection
The SEL-700G detects stator ground faults on high-impedance grounded generators using a conventional neutral-overvoltage element with a third-harmonic voltage differential detection scheme for 100 percent stator winding coverage.

Current Differential Protection
Optional current differential elements detect stator faults using a secure, sensitive current differential function. Power transformer and CT connection compensation allows the unit step-up transformer to be included in the generator differential zone.

Power Elements
Sensitive power elements protect against reverse power, overload conditions, or low forward power.

RTD-Based Thermal Protection
Use an internal 10 RTD input card or an external SEL-2600 RTD Module to acquire thermal data for alarm, monitoring, and trip functions in the SEL-700G.

Metering and Reporting
View generator autosynchronizer, Sequential Events Recorder (SER), and 180-cycle oscillographic event reports to analyze generator startup, shutdown, or system faults. Measure electrical, thermal, and generator run-time quantities.

Synchrophasor Data
Apply SEL synchrophasors (IEEE C37.118) to turn state estimation into state measurement and to provide early warning of potential system instability. The SEL-700G phasor measurement accuracy meets the IEEE C37.118-2005 Level 1 requirement.

  • Flexible I/O for Local Control and System Applications
    The base system includes three digital outputs and two digital inputs. There are three card slots for optional SELect I/O cards, including the following:
    • Four digital inputs (DI) and four digital outputs (DO)
    • Four digital inputs (DI) and four fast, high-current interrupting digital outputs (DO)
    • Four digital outputs (DO), three digital inputs (DI), and one analog output (AO)
    • Four digital inputs (DI) and three digital outputs (DO) (2 Form C and 1 Form B)
    • Four analog inputs (AI) and four analog outputs (AO)
    • Eight analog inputs (AI) for dc process values
    • Eight digital inputs (DI)
    • Eight digital outputs (DO)
    • Ten RTD inputs
    • Two ac voltage inputs
    • Current differential inputs
  • Integrated Communications
    The SEL-700G offers many communications media and protocol options. Versatile communications options provide fast integration into both new and existing applications.
    • Communications Media
      • Ethernet 10/100BASE-T
      • Ethernet 100BASE-FX
      • Single or dual Ethernet ports
      • EIA-232 serial
      • EIA-485 serial
    • Communications Protocols
      • IEC 61850
      • DNP3 LAN/WAN
      • DNP3 serial
      • Modbus TCP
      • Telnet
      • FTP
      • IEEE C37.118 synchrophasors
  • Retrofit Replacement Kits
    Replace existing feeder protection with the SEL-700G and the applicable mounting kits. These kits provide the parts needed to easily replace many older feeder relays with the SEL-700G. Find other mounting options with the SEL Mounting SELector.
  • Conformal Coating
    Protect equipment from harsh environments and airborne contaminants such as hydrogen sulfide, chlorine, salt, and moisture.

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