Line current differential relay Schweitzer Engineering Laboratories

Superior Differential Protection - With Zero Settings.

Use the economical SEL-387L to provide sensitive, fast, secure three-pole current differential protection with zero settings. The differential operating system of hte 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. 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. 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.

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