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Distributed Generator Interconnection Relay

SEL recommends selecting the SEL-751 Feeder Protection Relay or the SEL-849 Motor Management Relay in place of the SEL-547.

The SEL-751 provides complete feeder protection—including over-/undervoltage, over-/underfrequency, and rate-of-change of frequency—to detect power system problems and separate the local supply from the utility. It is available with a color touchscreen display for simplified operation and supervision.

The SEL-849 protects low- or medium-voltage three-phase induction and variable-frequency drive-fed motors. It detects power system problems and separates the load from the utility using over-/undervoltage and over-/underfrequency elements.

SEL will continue to support and warranty the SEL-547.

Starting At

$1,040 USD

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System Islanding Protection–Quickly detect local system disturbances and trip the transfer switch to separate the utility supply from the load. The SEL-547 Distributed Generator Interconnection Relay is a voltage-based protective relay with over-/underfrequency and over-/undervoltage elements to trip for local system “islanding” or system-wide voltage or frequency disturbances.

Directional Power Protection–Detect directional power flow problems, and quickly disconnect the utility supply from the load and the distributed resource. The directional power element trips for power export violations or generator motoring.

Synchronism Check Functionality–Protect both the generator and the grid from damage caused by an out-of-phase close. A synchronism check element detects healthy voltage, frequency, and angle, and supervises breaker/switch closing.

Renewable Generation Application–Apply the SEL-547 to small-scale wind and other renewable generation installations at the point of common coupling between the utility and the source.


Protection and Control Elements (ANSI Device Number)

  • Four undervoltage elements (device number 27)
  • Four overvoltage elements (device number 59)
  • Four over-/underfrequency elements (device number 81)
  • Directional power element (device number 32)
  • Synchronism check element (device number 25)

Trip for System Problems—Supervise System Restoration

  • Over-/undervoltage or over-/ underfrequency elements trip for local system islanding or system-wide voltage/frequency disturbance.
  • Directional power element trips for power export violations or generator motoring.
  • Synchronism check element detects healthy voltage/frequency/angle and supervises breaker/switch closing.

Modbus Communications Interface
Modbus communications protocol interfaces the SEL-547 to outside communications networks.

Serial Interaction and Integration
Processors or other systems, supports SEL Compressed ASCII, SEL Fast Operate and SEL Fast Meter Commands. SEL-LMD Virtual Port Switch Protocol allows multidrop engineering access.

Reliability and Rugged Design
The SEL-547 withstands vibration, electrical surges, fast transients, and extreme temperatures, meeting stringent industry standards. The printed circuit boards are conformal coated to provide an additional barrier to airborne contaminants such as hydrogen sulfide, chlorine, salt, and moisture.

Minimum QuickSet Version

Latest Firmware Versions

There are no firmware versions available for this product.

Product Revision Firmware ID Date Available Serial Number
SEL-547 R101 SEL-547-R101-V0-Z001001-D20080922 10/6/08 2008280001

The Firmware IDs for older versions of the firmware can typically be found in Appendix A of the instruction manual.

Minimum QuickSet Version

Product Certifications