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Today’s LiveWire Spotlight examines NERC’s first 2015 posting of Lessons Learned. This latest grouping addresses two unusual, but informative, electric system relay Misoperations that were triggered by transient signals externally coupled onto their inputs.

Electric system outages that result from relay Misoperations continue to be one of NERC’s top reliability concerns. These Lessons Learned capture the subtlety and complexity of the threats, which could lead to further regulation if they persist.