SEL-387L Line Current Differential Relay
|Use SEL-387L Line Current Differential Relays for economical, easy-to-apply line protection.
Front- and Rear-Panel Diagrams
Protect two-terminal transmission lines and subtransmission lines with the same ratio CTs on each end. Apply a 64 kb digital communications channel for complete phase and ground fault protection with no settings.
Connect single-mode optical fiber, 1300 and 1550 nm, for distances up to 120 km without a repeater. No additional transceivers are required.
Apply the SEL-387L with a multiplexed communications system using the built-in IEEE C37.94 compliant connection. Connect to EIA-422 and G.703 multiplexers using the SEL-3094 Interface Converter.
Low-Cost Replacement of Obsolete Systems
Use the SEL-387L for complete protection of two terminal lines. Save money with low equipment costs and no settings costs. Replace error-prone pilot-wire relays with a sensitive and secure fiber-optic line current differential relay. Use the built-in communications monitoring and alarm system to improve protection quality