- 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.