- Protection and Control Elements (ANSI Device Number)
- Two undervoltage elements (device 27)
- Two overvoltage elements (device 59)
- Four over-/underfrequency elements (device 81)
- Directional power element (device 32)
- Synchronism check element (device 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
Includes ASCII commands for human-machine interaction. For integration with Communications 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.
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- Distributed Generation and Utility Interconnection Protection - separates the customer's system from the utility supply when the SEL-547 Relay detects utility supply problems.
- System Disturbance Detection and System Restoration - over/undervoltage or over/underfrequency elements detect local system problems and trip the transfer switch separating the utility supply from the load.
- Reverse Power Flow Detection - the directional power element in the SEL-547 detects reverse power flow to trip the transfer switch and separate the utility supply from the load and generator.
- Generator Motoring Detection - The directional power element in the SEL-547 detects potentially harmful reverse power flow and trips the switch/breaker, breaking parallel operation.
Budgetary Retail, Quantity 1: $1,000
(Prices displayed are for planning purposes and are subject to change. Contact your SEL sales representative today for a quote on configurations and quantities to meet your needs.)
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