SEL-351/SEL-351A Protection System
|The SEL-351 Protection System has built-in Ethernet and IEEE C37.118 synchrophasors, and is ideal for directional overcurrent applications. Optional MIRRORED BITS® communications and power quality monitoring add flexibility to solutions. The SEL-351 is the protection standard for utility and industrial electrical systems around the world.
Front- and Rear-Panel Diagrams
Complete Overcurrent Protection
Protect lines and equipment using phase, negative-sequence, residual-ground, and neutral-ground overcurrent elements with directional control.
Increased Overcurrent Element Security With Second-Harmonic Blocking
Use the second-harmonic blocking elements to detect transformer energization, and block selected tripping elements until inrush conditions subside.
Enhanced Breaker Monitoring
Inspect reports for the most recent trip and close operating times and average operating times, or gather trending data for up to 128 previous operations. This information allows timely and economical scheduling of breaker maintenance.
Fast Dropout Breaker Failure Element
Detect a failed circuit breaker with built-in breaker failure detection elements and logic.