SEL

World’s fastest transmission line relay available

The SEL-T400L Time-Domain Line Protection is a traveling-wave microprocessor-based relay. It detects power system faults and sends a trip signal to breakers four to 10 times faster than present-day phasor-based relays, offering ultra-high-speed and secure protection of critical transmission lines.
“We are protecting energy moving at the speed of light. The T400L is like moving from a car to a jet!” SEL President Dr. Edmund O. Schweitzer, III said. “Time domain-based protection is the future and this is the most important thing SEL has done since releasing the first digital relay in 1984.”
For more information, you can visit the company web site.

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