SEL-700G

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, DeviceNet, and other protocols.

Major Features and Benefits

The SEL-700G family of protection relays provides unsurpassed protection, integration, and control features in a

flexible, compact, and cost-effective package.

➤ Basic Generator Protection Features (SEL-700G0): Ground differential; sensitive restricted earth fault;

thermal overload; phase, negative-sequence, residual-ground, and neutral-ground overcurrent elements for

backup; residual-ground and neutral-ground time-overcurrent elements; directional residual-ground and neutralground

overcurrent elements; current unbalance element; voltage-controlled, voltage-restrained time-overcurrent

element for backup protection; breaker failure protection for three-pole breaker; under- and overvoltage

elements; loss-of-potential element; volts/hertz or overexcitation protection; directional power elements; loss-offield;

over- and underfrequency protection elements; off-frequency time accumulators; rate-of-change-offrequency

elements; inadvertent energization protection; RTD protection (requires internal or external SEL-2600

RTD option); field ground using an SEL-2664 Field Ground Module.

➤ Optional Generator Protection Features (SEL-700G0+, SEL-700G1, SEL-700G1+): Generator synchronismcheck

elements; synchronism-check under- and overvoltage elements; autosynchronism; backup compensator

distance elements; out-of-step elements; 100% stator ground protection elements; and dual-slope current differential

protection with harmonic blocking and restraint elements to provide sensitive and secure protection. The

high-security mode provides additional security against CT saturation during external events including external

transformer energization, external faults, etc.

➤ Intertie Protection Features (SEL-700GT): Phase, negative-sequence, and residual-ground overcurrent

elements; phase, negative-sequence, and residual-ground time-overcurrent elements; phase, negative-sequence

and residual-ground directional overcurrent elements; breaker failure protection for three-pole breaker; underand

overvoltage elements; loss-of-potential element; directional power elements; over- and underfrequency

SEL-700G0, SEL-700G1 SEL-700GT SEL-700GW

Basic to Comprehensive

Protection Intertie Protection Basic Dual-Feeder

Overcurrent Protection

Small, Medium, and

Large Generators Intertie and Generator Wind Generator

SEL-700G Family of Generator and

Intertie Protection Relays

SEL-700G Data Sheet Schweitzer Engineering Laboratories, Inc.

2

protection elements; rate-of-change-of-frequency elements; tie synchronism-check elements; synchronism-check under

and overvoltage elements; autosynchronism; and RTD protection (requires internal or external SEL-2600 RTD option).

➤ Optional Intertie Protection Features (SEL-700GT+). Addition of basic generator protection features, as

shown above for the SEL-700G0, to create intertie and generator protection. The relay also includes generator

synchronism-check and autosynchronism functions.

➤ Wind Generator Protection Features (SEL-700GW). The SEL-700GW is configured with two sets of phase,

negative-sequence, and residual-ground overcurrent elements, and phase, negative-sequence, and residual-ground

time-overcurrent elements to provide dual-feeder protection in a multiwind generator network application. The relay also

includes three-pole breaker failure protection for two breakers.

➤ Generator Monitoring. Monitor ambient and generator winding temperature using optional analog inputs or

RTDs and protect the generator from thermal damage. Use off-frequency time accumulators and protect steam

turbine blades from fatigue failures because of off-frequency vibration.

➤ Operator Controls. Four programmable front-panel pushbuttons each with two programmable LEDs allow for a

wide variety of uses, including easy trip and close control and status indications for a breaker. Implement local

and remote operator control schemes using 32 local and 32 remote control bits.

➤ Relay and Logic Settings Software. ACSELERATOR QuickSet® SEL-5030 Software reduces engineering costs

for relay settings and logic programming. The tools in ACSELERATOR QuickSet make it easy to develop

SELOGIC® control equations. Use the built-in phasor display to verify proper CT polarity and phasing. Use the

synchroscope to watch the autosynchronism controls.

➤ Metering and Reporting. Built-in metering functions eliminate separately mounted metering devices. Analyze

Sequential Events Recorder (SER) reports and oscillographic event reports for rapid commissioning, testing, and

post-fault diagnostics. Unsolicited SER protocol allows station-wide collection of binary SER messages.

➤ Additional Standard Features. Includes Modbus® RTU, Event Messenger support, MIRRORED BITS® communications,

load profile report, support for 12 external RTDs (SEL-2600 module), IRIG-B input, advanced

SELOGIC, configurable labels, IEEE C37.118-compliant synchrophasor protocol, and fiber-optic serial port.

➤ Optional Features. Select from a wide offering of optional features, including SNTP (Simple Network Time

Protocol), IEC 61850, Modbus® TCP/IP, DNP3 LAN/WAN, DNP3 Serial, 10 internal RTDs, expanded digital/

analog I/O, voltage/current inputs, additional EIA-232 or EIA-485 communications ports, and single or dual,

copper wire or fiber-optic Ethernet ports.