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

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The west-east Michigan 345 kV paths then discon- been flowing along that path immediately reverse nected at 4:10:37, leaving eastern Michigan con- direction and began flowing in a giant loop coon nected by only a circuitous path around northern terclockwise from Pennsylvania to New York • Michigan that disconnected one second later, and Ontario and into Michigan. the connections to Ontario and northern Ohio. Investigators are still studying the power flows that What happened in Pennsylvania, New Yor4 resulted. Ontario,Quebec,and Maritimes areas. At 4:10:38, the Midland Cogeneration Venture 4:10:40 -4:10:44 PM—Four transmission lines dis (MCV), loaded to 1265 MW, tripped off line. connect between Pennsylvania and New York F • 4:10:40—Homer City-Watercure Roa d 345 kV The MCV generation trip imposed heavier flows on • 4:10:40—Homer City-Smile Road 345 kV • the remaining transmission system, and left eastern • 4:10:41 —South Ripley-Dunkirk 230 kV Michigan and nor^ern Ohio with very depressed • 4:10:44 —East Towanda-Hillside 230 kV voltages. The remain-L-1g transmission paths into the Responding to the surge of energy flowing north ou Detroit area from the northwest separated. of Pennsylvania through New York and Ontari, into Michigan, these four lines disconnected withc At 4:10:38, the Perry-Ashtabula-Erie West 345 kV four seconds of one another and separate transmission line tripped, severing the path into the Pennsylvania from New York. northern Ohio area from Pennsylvania along the southern shore of Lake Erie. At this point, the northern part of the Easter Interconnection (which still included the rapidl The MCV generation trip imposed heavier flows on dwindling load in eastern Michigan and norther the remaining transmission system, and left eastern Ohio) remained connected to the rest of th Michigan and northern Ohio with very depressed Interconnection at only two locations: 1) in the eat_ voltages. The remaining transmission paths into the through the ties between New York and Net Detroit area from the northwest separated. Jersey, and 2) in the west through the 230 kV tram mission line between Ontario, Manitoba, r At 4:10:38, the Perry-Ashtabula-Erie West 345 kV Minnesota. transmission line tripped, severing the path into the northern Ohio area from Pennsylvania along the Heavy power flows were moving northward ow southern shore of Lake Erie. the New York-New Jersey ties. Summary of the Situation at 4:10:38 4:10:41 PM — Transmission line disconnects an When the Perry-Ashtabula-Erie West 345 kV generation trips in northern Ohio transmission line disconnected at 4:10:38, the entire • Fostoria Central-Galion 345 kV eastern Michigan and northern Ohio load centers • Perry 1 nuclear unit (rated 1252 MW) had little generation left available to them and the •Avon Lake 9 unit (rated 616 MW) • voltage was declining.The only connection between •Beaver-Davis Besse 345 kV those load centers and the rest of the Eastern Interconnection was at the interface between the The Fostoria Central-Galion line forms part of di Michigan and Ontario systems. Also, the frequency pathway from central to northern Ohio. That pat was declining in northern Ohio in those areas that was already blocked by the combination of di had separated from the Interconnection. Galion-Muskingum-Ohio Central line disconnec When the transmission lines along the southern ing at 4:08:58, and the East Lima-Fostoria Centre shore of Lake Erie disconnected, the power that had line disconnecting at 4:09:06. • I 11 l I ' I ,111,1..I _.... • •