Transmission Network Performance Report 2005 - National Grid

Transmission and CustomersFY2005• Some of the significant New York LOS events have been indicated here:Table 2-2: Significant New York Loss of Supply Events for FY2005Date Circuit Details Customer Impact05/23/0401/24/0508/17/04Levitt-Rome #8(West of Utica,NY)ThousandIslands-Coffeen#4(Watertown, NY)Republic-Ticonderoga #2(Western shoreof LakeChamplain inNew York)The line tripped due to a lightningstrike and locked out due to a stuckrelay contactCoffeen station 115 kV CapacitorBank was removed from service andsubsequently the capacitor bankcircuit interrupter exploded. Severalbreakers opened and reclosedautomatically but one of them failedto reclose due to a burnt closing coil,causing a sustained outage to theThousand Islands-Coffeen #4 line.The trip was caused when a guywire broke and got up into theconductorApproximately 6000customers wereinterrupted for11hours and 15minutes.Approximately15,000 customerswere interruptedabout 1 hour.Approximately 4400customers lostpower for 131minutes. The eventalso caused loss ofgeneration of44MW.22 National Grid Performance Report