The SEL-551 Overcurrent/Reclosing Relay replaces the many relays, control switches, and wiring required in traditional distribution substation protection and control panels. The relay also replaces line recloser control packages at a fraction of the cost.

Comprehensive Overcurrent Protection
Phase, negative-sequence, residual ground, and neutral overcurrent protection in a compact package. Complete set of instantaneous, definite-time, and time-overcurrent elements.
Reclosing
Program up to four shots of reclosing with sequence coordination logic for coordination with downstream reclosers.
acSELerator QuickSet® SEL-5030 Software Helps speed relay application by allowing you to develop relay settings off-line, program SELogic® control equations, and analyze post-fault event reports.
Protection and Control LogicSELogic control equations with SELogic variables and timers allow traditional or advanced protection schemes. Programmable local control elements permit front-panel pushbutton control. Programmable text display points provide enhanced local operator information.
Monitoring and Reporting
Instantaneous, peak, and demand metering. The latest twenty 15-cycle oscillographic data event reports and the latest 256 Sequential Events Recorder (SER) records are stored in nonvolatile memory.
Communications
ASCII, binary, and Modbus® RTU protocols enhance integration capabilities.

HOTPASH

SEL-551 Overcurrent/Reclosing Relay