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.