SEL SEL-551C Overcurrent/Reclosing Relay
SEL-551C
Overcurrent/Reclosing Relay
Asset Protection—Monitor and protect distribution feeders, distribution buses, transformers, capacitors, or circuit breakers.
Current Transformer (CT) Connection Versatility—Connect the separate neutral-current input to accommodate core-balance CTs, separate neutral CTs, tertiary-winding CTs, or CT ground-residual circuits.
Reclosing Control—Coordinate with downstream reclosers using sequence coordination logic to program up to four reclosing attempts.
Integration—Integrate into protection and control schemes with the Modbus RTU protocol.
The optional front-panel EIA-232 port on the SEL-551C allows easy connection, even while communicating on the rear port.
Panel-mount or rack-mount hardware package.
Rear port EIA-232 or EIA-485 serial communications; ports include a demodulated IRIG-B time-code input.
Optional front EIA-232 port provides easy access to relay settings and reports, even when rear port is configured as EIA-485 Modbus RTU.
Use Synchrowave Event Software to display oscillograms and vector diagrams to analyze event reports.
Conformal Coating: Protect equipment from harsh environments and airborne contaminants, such as hydrogen sulfide, chlorine, salt, and moisture.
Complete Overcurrent Protection
Protect lines and equipment using a sensitive and secure mix of phase, negative-sequence, and ground overcurrent elements. Provide high-speed operation, even with severe CT saturation, using the SEL Adaptive Overcurrent Element.
acSELerator QuickSet SEL-5030 Software
QuickSet helps speed up the relay application by allowing you to develop relay settings offline, program SELogic control equations, and analyze post-fault event reports.
Field-Proven Hardware With Optional Features
The six inputs and three outputs are fully programmable to meet your application needs.
A wide operating temperature range (–40° to +85°C) allows for installation in a control house or outdoor enclosure.
Advanced Programmable Logic and Local/Remote Controls
Configure traditional or advanced protection and control schemes. Use edge- triggers or latches within the SELogic control equations for advanced control.
SEL-551C