SEL SEL-387L Line Current Differential Relay
SEL-387L
Line Current Differential Relay
Use SEL-387L Line Current Differential Relays for economical, easy-to-apply line protection.
Line Current Differential Protection—Protect two-terminal transmission and subtransmission lines with the same ratio CTs on each end. Apply a 64 kbps digital communications channel for complete phase and ground fault protection with simple settings.
SEL-387L
Simple Installation—Set the relay in minutes! Only label the relay and terminals, and provide a unique address for the transmit and receive communications.
Connect single-mode optical fiber, 1300 nm and 1550 nm, for distances up to 120 km (74 mi) without a repeater. No additional transceivers are required.
Differential Communications—Apply the SEL-387L Line Current Differential Relay with a multiplexed communications system using single-mode fiber optics or the built-in IEEE C37.94 compliant connection.
Three-Terminal and Tapped Lines—Protect three-terminal lines with two SEL-387L Relays and one SEL-311L Line Current Differential System.
Coordinate the tapped load protection for sensitivity and speed by designating the SEL-311L as the leader to make all the protection decisions. No settings are made in the SEL-387L Relays.
Simple Backup Protection—Choose the SEL-387L as a simple solution for discrete backup protection.
Coordinate with another local relay, such as an SEL-551 Overcurrent/Reclosing Relay, to provide breaker failure, autoreclose, overcurrent, and ground fault protection functions in addition to current differential protection.
Easy Application
Protect two-terminal transmission lines and subtransmission lines with the same ratio CTs on each end. Apply a 64 kbps digital communications channel for complete phase and ground fault protection with no settings.
Simple Installation
Connect single-mode optical fiber, 1300 and 1550 nm, for distances up to 120 km without a repeater. No additional transceivers are required.
Flexible Communications
Apply the SEL-387L with a multiplexed communications system using the built-in IEEE C37.94 compliant connection.
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.
acSELerator Software
Develop relay settings off-line, program SELogic control equations, and analyze postfault event reports
IEEE C37.94 compliant multimode fiber-optic interface
1300 nm multimode or single-mode interface
1550 nm single-mode fiber-optic interface
Conformal Coating protects equipment from harsh environments and airborne contaminants, such as hydrogen sulfide, chlorine, salt, and moisture.