Project Description

Schweitzer Engineering Laboratories has delivered solutions for over 25 years that make electric power safer, more reliable, and more economical.

SEL invented the world’s first digital distance relay in 1984, revolutionizing fault location, event analysis, and protection. In 1999, south of Orlando, Florida, SEL implemented smart grid projects in the International Drive power grid to automatically sectionalize a faulted line and reconfigure the grid to restore service to unfaulted sections—all within six cycles.

Leading in wide-area monitoring, protection, control, and analysis, SEL has installed over 31,000 synchrophasor phasor-measurement-ready relays around the world.

SEL designs and manufactures products for the world’s most challenging production environments to exceed all industry standards for temperature, shock, and electric stress. SEL products operate in a temperature range of –40° to +85°C (–40° to +185°F). They withstand electrostatic shock up to 15 kV and are vibration/shock resistant up to 15 g.


Automation and Integration

SEL information processors enable you to design and implement both simple and complex intelligent electronic device (IED) integration solutions. Supported peer-to-peer technologies include SEL’s patented Mirrored Bits® communications and IEC 61850.

Reduce Arc-Flash Hazards

SEL arc-flash detection technology significantly decreases the time it takes a relay to trip in response to an arc fault, which reduces hazardous arc‑flash incident energy. SEL combines light-sensing technology with fast overcurrent protection to provide high-speed arc-flash detection (AFD).

Arc Sense Technology

Arc Sense technology (AST) from SEL is an innovative solution that detects high-impedance faults (HIF) on a distribution system. A high-impedance fault occurs when a conductor contacts a ground surface but does not produce a large fault current. SEL’s patented AST detects and clears faults that might not be detected by conventional overcurrent elements. AST algorithms provide improved fault detection over traditional methods as well as enhanced security when compared to existing technologies.