Project Description

Generator Protection Products

SEL has set the standard in generator protection. Apply SEL generator protection products and avoid expensive equipment damage and failure while maintaining system performance and increasing availability.
SEL quality tested features provide complete primary and backup protection from all types of faults. Upgrade to an SEL world-class protection system today and be confident that your generation system will be working tomorrow.


Related Products

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.

SEL-300G Generator Relay

In order to make technology available for the first time that complies with IEEE turbine protection standards, SEL has applied its expertise in the production of microprocessor-based relays to create the SEL-300G, a generator relay that includes several unique features designed for unsurpassed protection, monitoring, and control of electrical generators.

SEL-547 Distributed Generator Interconnection Relay

Apply the flexible SEL-547 at the transfer switch site (interconnection point between the utility and the customer) and at each individual generator site. When the SEL-547 at the transfer switch site detects utility supply problems, it separates the customer system from the utility supply.

SEL-2664 Field Ground Module

Add the SEL-2664 Field Ground Module to the SEL-300G Generator Relay to protect all the critical components in your generator with one comprehensive relay.

SEL-2664S 100% Stator Ground Protection

The SEL-2664S uses multisine signal injection to provide 100% stator ground protection 100 percent of the time. The relay works with the generator in or outof- service, including the generator ramp-up with no blind period.

SEL-2600 RTD Module

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SEL-2600 RTD is a microprocessor-based module, which can measure and transmit data from up to 12 RTDs and a single contact status located in transformers, breakers, motors, generators, or other system apparatus.


300G 700G 547
Generator Protection
Induction Motor Protection
Breaker Failure Protection f f
Equipment Thermal Monitoring + +
Generator Intertie Protection
Synchronism Check + +
Integrated Synchronizer +
21P Phase Mho or Compensator Distance +
24 Overexcitation (Volts/Hertz)
27/59 Under-/Overvoltage
32/37 Directional/Underpower Elements
40 Loss-of-Field
46 Current Unbalance
47 Phase Reversal
49 Thermal
50 (P,N,G) Overcurrent (Phase, Neutral, Ground)
50Q Negative-Sequence Overcurrent
51 (N,G) Time-Overcurrent (Neutral, Ground)
55 Power Factor f f
60 Loss-of-Potential
64G 100 Percent Stator Ground +
64F Field Ground
67 (N,G) Directional Overcurrent (Neutral, Ground)
78 Out-of-Step
81 Over-/Underfrequency
87 Current Differential + +
87G Restricted Earth Fault
Separate Neutral Overcurrent
Inadvertent Energization f f
Flashover Protection f f
SELogic Control Equations/Remote Control Switches
Nonvolatile Latch Control Switches
Multiple Settings Groups
Station Battery Monitor
Breaker Wear Monitor
Event Report (Multicycle Data)/Sequential Events Recorder
Demand Meter
Load Profile Report
RTD (Resistance Temperature Detector) Inputs + +
Ethernet +
IEC 61850 +
Simple Network Time Protocol (SNTP)
Modbus TCP
Modbus RTU Outstation +
Synchrophasors With IEEE C37.118 Protocol
Mirrored Bits Communications
DeviceNet +
Accepts Wye or Open-Delta Voltage Transformers +
Connectorized (Quick Disconnect) Available +
Standard Feature
+ Model Option
f This function may be created using settings