SEL-387L

Line Current Differential Relay

Use SEL-387L Line Current Differential Relays for economical, easy-to-apply line protection.

Starting At

USD2,940

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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.

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. Connect to EIA-422 and G.703 multiplexers by using the SEL-3094 Interface Converter.

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 Kb 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. 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.

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.

Minimum QuickSet Version

Minimum QuickSet Version

Product Certifications

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