The SEL-1551 relay is a overcurrent/reclosing relay designed to be compatible with the 1771 PLC chassis. This relay mounts into the chassis to maximize overcurrent protection, reclosing control and system integration. The product performs all its power system protection functions independently from the PLC. All relay settings and reports can be accessed through the EIA-232 port on the front panel. Relay elements status, metering information and simplified event reports are also available through the PLC backplane. Key features include numerous phase, ground and negative-sequence overcurrent elements; multiple-short reclosing with sequence coordination; enhanced SEL logic control equations to create traditional or advanced schemes; remote control logic to enable/disable schemes; operate circuit breakers; and event reports and sequence-of-events stored in non-volatile memory.
Schweitzer Engineering Laboratories–Inquire R.S. 125