ERMUSR MISC. ISSUES 01-13-2004 - Laserfiche WebLink

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•4:08:58—Galion-Ohio Central-Muskingum 345 kV _ r ■ 4:09:06-East Lima-Fostoria Central 345 kV •4:09:234:10:27-Kinder Morgan (rating: 500 MW; loaded to 200 MW) �� When the Galion-Ohio Central-Muskingum and East �. d .3 �- Lima-Fostoria Central transmission lines disconnect- ' Y aj z ` ed, this blocked the transmission paths from south- . outh- ,rt ,`�� em and western Ohio into northern Ohio and east- re4 - em Michigan.Thus the combined northern Ohio and :i,'. eastern Michigan load centers were connected only t , a 11 by the transmission lines from: 1) northeastern Ohio and Pennsylvania along the southern shore of Lake d - * '-- �`• +�= Erie; ?) western Michigan via the west-east lines that li ,,) cross the scare; and 3) Ontario. Eastern Michigan was connected to northern Ohio only by three 345 kV transmission lines near the southwestern bend of Lake Erie. 7 • The Kinder Morgan generating unit tripped (shut down) in central Michigan (loaded to 200 MW). � s ov ` i _; Power flows became heavy from Indiana and over An electrical transmission tower rises behind the entrance the west-east Michigan transmission lines to serve to the Hanna Substation in Rootstown, Ohio Sunday, loads in eastern Michigan and northern Ohio. Aug. 17, 2003. A problem with one of the transmission lines leading from this substation, belonging to The reduced transmission capacity serving the FirstEnergy is suspected as being part of the chain of events that led to the massive power blackout Thursday northern Ohio load centers resulted in the transmis- n the eastern United States and parts of Canada. sion voltage becoming depressed in that area as (AP Photo/Jamie-Andrea Yanak) load exceeded the rapidly declining power delivery capability. Central 345/138 kV transformers disconnected and did not reconnect, isolating the 138 kV system from At about 4:09, the Eastern Interconnection frequen- the 345 kV support at the Canton Central substation. cy rose by 0.020 - 0.027 Hz, which represents a The Sammis-Star 345 kV line then disconnected at demand loss in the range of 700 - 950 MW. 4:06:03, which completely blocked the 345 kV path into northern Ohio from eastern Ohio. This left only 4:10:00-4:10:38 PM-Transmission lines disconnect three paths for power to flow into northern Ohio: 1) across Michigan and northern Ohio,generation trips from northeastern Ohio and Pennsylvania around off line in northern Michigan and northern Ohio, the southern shore of Lake Erie, 2) from southern and northern Ohio separates from Pennsylvania Ohio (recall, however, that part of that pathway was •4:10— Harding-Fox 345 kV severed following the Stuart-Atlanta line trip at • 4:10:04 - 4:10:45 —Twenty generators along Lake 2:02), and 3) from eastern Michigan. This also Erie in northern Ohio (loaded to 2174 MW total) substantially weakened northeast Ohio as a source • 4:10:37—West-East Michigan 345 kV of power to eastern Michigan, making the Detroit • 4:10:38 —Midland Cogeneration Venture (loaded area more reliant on the west-east Michigan lines and to 1265 MW) the same southern and western Ohio transmis- •4:10:38—Transmission system separates northwest sion lines. of Detroit During the period 3:42:49-4:08:58, multiple 138 kV 4:10:38 —Perry-Ashtabula-Erie West 345 kV lines across northern Ohio disconnected themselves. Twenty generators (loaded to 2174 MW) tripped off This blacked out Akron and the areas west and line along Lake Erie during the period 4:10:04 - south. 4:10:45. The loss of this generation increased the 4:08:58 - 4:10:27 PM — Transmission lines into Mich ganoload cente seon thehremaiining paths,ewhich northwestern Ohio disconnect, and generation trips included the west-east transmission lines that cross in central Michigan Michigan. 32 1 4th Quarter 2003