SEL-387L Line Current Differential Relay
Use SEL-387L Line Current Differential Relays for economical, easy-to-apply line 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
Helps speed relay application by allowing you to develop relay settings off-line, program SELogic Control Equations, and analyze post-fault event reports.
- Simple Application
The differential operating system of the SEL-387L requires no settings. Configure the transmit and receive address, and the SEL-387L is ready to protect transmission lines and cables of any voltage.
- IEEE C37.94 compliant multimode fiber-optic interface
- 1300 nm multimode or single-mode interface
- 1550 nm single-mode fiber-optic interface
Conformal Coating—Protect equipment from harsh environments and airborne contaminants such as hydrogen sulfide, chlorine, salt, and moisture.
Learn more about conformal coating .
- Add independent breaker control to any relay. The SEL-9510 Control Switch Module easily installs in panel or rack locations for independent local control and status indications.
- SEL-2800 Family of Fiber-Optic Transceivers
Directly connect an SEL-2800, -2810, -2812, 2814, -2815, -2829, -2830, or -2831 Fiber-Optic Transceiver to an EIA-232 serial port for full duplex communications with a variety of systems and devices. The SEL-2810 and SEL-2812 use the same fibers to also transfer an IRIG-B time synchronizing signal to the relay. - SEL-9220 Fiber-Optic Adapter for SEL-300 Series Relays
Directly connect the SEL-9220 Fiber-Optic Adapter for SEL-300 Series Relays to the EIA-485 serial port to communicate with a variety of systems and devices. Use an SEL-2812MT or SEL-2812FT Fiber-Optic Transceiver for the other end of the fiber-optic link to use the same fibers to also transfer an IRIG-B time synchronizing signal to the relay.
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Instruction Manuals
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