Minimize arc-fault energy

Schweitzer Engineering Laboratories Inc. (SEL) offers arc-flash detection (AFD) capability in the SEL-751A Feeder Protection Relay, providing automatic protection against dangerous arc-flash events. AFD interrupts power to the arc flash before it can cause severe personal injury, extensive equipment damage, and lengthy system outages.
By Control Engineering Staff June 1, 2009


Schweitzer Engineering Laboratories Inc. (SEL) offers arc-flash detection (AFD) capability in the SEL-751A Feeder Protection Relay, providing automatic protection against dangerous arc-flash events. AFD interrupts power to the arc flash before it can cause severe personal injury, extensive equipment damage, and lengthy system outages. The SEL-751A AFD solution uses fiber-optic, arc-flash light sensors to detect the light produced by an arc-flash event. To prevent false tripping, the SEL-751A looks for an overcurrent that coincides with the light flash. When both conditions are met, the SEL-751A sends a trip signal to the circuit breaker in as fast as 2 ms. This fast tripping significantly reduces the damage-causing energy released by the arc-flash event. www.selinc.com/Arc-Flash Schweitzer Engineering Laboratories Inc.

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