ConEd: Failed relay systems, not transmission equipment, caused NYC blackout

Consolidated Edison on Monday said preliminary results of an investigation into a weekend power outage on Manhattan’s West Side indicated a failed relay protection system was the primary cause.

The utility initially blamed a “significant transmission disturbance,” but now says the relay protection system at its West 65th Street substation “did not operate as designed.”

The outages began shortly before 7 p.m. on Saturday, leaving approximately 72,000 customers without power. ConEd got the last of six electrical networks back in service shortly before midnight the same day.

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