SEL-387E Current Differential and Voltage Relay
The SEL-387E Current Differential and Voltage Relay provides protection to two- or three-winding power transformers. Voltage inputs for power metering, overexcitation protection, and over-/underfrequency load shedding provide versatile solutions for power apparatus protection. Automation features reduce total project construction and operation costs through elimination of traditional external control switches, meters, and indicating lamps.
Front- and Rear-Panel Diagrams
Expand transformer protection capabilities with restricted earth fault (REF), negative-sequence overcurrent, overexcitation, and frequency elements. Innovative restraint and blocking prevent false trips and enhance security while maintaining sensitivity to internal faults.
Simplify engineering designs with SELogic® control equations for customizing advanced protection and control schemes. Apply frequency elements for load shedding and/or load restoration schemes.
Oscillographic event reports, Sequential Events Recorder (SER) reporting, and accurate three-phase power metering reduce or eliminate external recorder and metering requirements. Station battery voltage monitor, through-fault monitor, and circuit breaker contact wear monitor assist maintenance programs.
Serial and Ethernet communications provide complete integra-tion. IEC 61850 communications offer high-speed, relay-to-relay information exchange. Supported protocols include ASCII, binary, and SEL distributed port switch communications. Built-in web server provides read-only point of access to view metering, settings, targets, and SER