html{display:none} Transmission Protection | Schweitzer Engineering Laboratories

SEL transmission protection solutions provide complete primary and backup protection from all types of faults. Using these devices helps you avoid expensive equipment damage and failure while maintaining system performance and increasing availability.

Transformer Protection

SEL devices protect valuable transformers in power transmission systems.

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Busbar Protection

Protect busbars and switchgear with high-speed differential fault detection, or expand your protection with features such as restricted earth fault, arc-flash, and overcurrent elements.

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Capacitor Bank Protection

Capacitor protection and controls increase power efficiency and reliability by improving the system’s power factor and voltage stability.

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Digital Secondary System Solutions

Time-Domain Link (TiDL) technology and SEL Sampled Values (SV) technology help protect and control substation primary equipment using digital devices in the secondary system that transmit data via fiber-optic cables.

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Remote I/O

Remote I/O modules transfer data from remote locations over fiber and expand the I/O of SEL relays, automation controllers, and other devices without modification to the control panel face.

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Configuration and Visualization Software

SEL software helps you optimize the configuration of your device and visualize power system events.

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Panels and Enclosures

Pre-engineered or custom panels and enclosures help keep costs low and increase system reliability when used for retrofit upgrades and new equipment installations.

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