January 2012 Capital Investment - National Grid

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Exhibit ___ (EIOP-19)Page 45 of 684Gardenville (C05156 & C30084) $68.0mGardenville is a 230/115kV station south of Buffalo that has two 115kV stations in closeproximity that are referred to respectively as New Gardenville and Old Gardenville, andwhich both serve over 750MW of regional load. New Gardenville was built between1959 and 1969 and has asset condition issues such as faulty control cables,deteriorated foundations and many disconnects which have deteriorated beyond repair.Old Gardenville, built in the 1930s, feeds regional load via eleven 115kV lines. Thestation has serious asset condition issues including, but not limited to, control cable,breaker, disconnect and foundation problems. The station has had no major updatessince it was built. There have been a number of misoperations that can be directlyattributed to control cable issues in the past several years alone.A project has been initiated to address these issues. A new breaker-and-a-half 115kVstation is to be built between the two existing stations to replace them. A new 115kVswitchyard will be constructed in the western section of the site and there will bererouting of approximately seventeen 115kV lines for the project to eliminate the current“criss-cross” arrangement outside of the station and eliminate line to ground clearanceissues. Project sanction is expected in winter of 2013 after the completion of preliminaryengineering.Rome (C03778 and C34983) $9.5mThe Rome station was constructed in the early 1920s. It has received severalreconfigurations over the years with the current 115kV to 13.2kV dual bus built in theearly 1970s. The 115kV system at the Rome Station experiences periods of low voltageparticularly if the tie-breaker is opened. Station property near the north bus section hasbeen under environmental remediation the past several years due to a former coke plantthat was located on the site. Assets located on the North yard will be relocated awayfrom this remediation site.There are multiple asset condition issues affecting the station noted in the 2011 AssetCondition Report. A Strategy paper proposing a station rebuild was sanctioned inOctober 2010 and preliminary engineering was completed in the fall of 2010 withsanction expected for June 2011. Project completion is targeted for spring of 2015.Oneida (C37876) $3mOneida is a 115 kV – 13.8 kV substation located in Verona, NY. The original station wasconstructed in the 1940s. The substation includes two LTC power transformers, eight115 kV circuit breakers, one 115 kV capacitor bank with circuit switcher, and a metalcladswitchgear with seven 13.8 kV feeders.The physical and electrical layout of the 115 kV yard makes it difficult to maintain orrepair equipment. Outages to maintain the 115 kV breakers are difficult since a lineoutage is required. The two 1959 Federal Pacific Equipment circuit breakers arecandidates for replacement due to maintenance issues and a lack of replacement parts.Spare parts are also no longer available for 13.8 kV breakers and the metal-cladswitchgear is in poor condition. The lines to Rome and Yahnundasis are difficult to getout due to voltage support issues and taking the R40 line out requires a customeroutage. The vertical phase configuration of the East/West 115kV busses is a concernII-2846
Exhibit ___ (EIOP-19)Page 46 of 684from a maintenance standpoint as the configuration makes tasks such as disconnectrepair or replacement difficult due to problems maintaining safe working clearances.Additional switching necessary for safe working clearance for workers weakens thesystem under certain contingencies. The # 3 and # 4 transformers do not have 115kV“high side” circuit breaking devices resulting in clearing the 115 kV bus for operation ofthe transformer or feeder backup protection. A majority of the 115 kV structurefoundations are failing and need repair or replacement.One of the 115 kV circuit breakers is a 1961 vintage Westinghouse GM-6B. This breakermodel has a complex arcing chamber and has on multiple occasions seen highresistance forming in the contacts. These breakers are being replaced on a system widebasis (see circuit breaker replacement strategy).The 13.8kV switchgear is a 1965 vintage Allis Chalmers and the arc chutes areasbestos. Tubing on the circuit breakers has failed resulting in the circuit breakers notbeing able to interrupt parallel load current. Parts for the circuit breakers are no longeravailable. The switchgear building is rusting, with settling making it difficult to open someof the switchgear doors and rack and draw out the circuit breakers. In order to replacethe # 3 transformer after failure, some of the bus duct was removed and replaced withcables. These cables were installed as an emergency repair. There are no facilities toadequately support or protect these cables.Conceptual engineering for the Oneida Station rebuild was completed in May 2010. ThePhase One work was returned to conceptual engineering for a change of scope in themetal-clad design and sanctioned in September 2011. Phase One construction isscheduled for completion in FY13 and the 115kV yard rebuild that is Phase Two isscheduled to start after FY16.Rotterdam (C34850) $0.1mRotterdam is a large station with 230kV, 115kV, 69kV, 34.5kV and 13.2kV sectionsspread out over multiple tiers on a hillside. The 230kV yard is the main source forSchenectady, Saratoga and Warren counties. Rotterdam is supplied from the PorterLines #30 and #31 and from Bear Swamp on the E205 line to Massachusetts. Asdiscussed in the 2011 Asset Condition Report, the 230kV yard has had performanceissues and there have been three (R23, R24 and R84) catastrophic failures of FederalPacific Electric RHE breakers. Two of the three 230kV auto transformers #7 and #8 havea higher than normal failure likelihood due to their design; specifically due to “T” beamheating and static electrification. There has also been an issue with capacitor bank #4tripping off line on differential protection if capacitor bank #3 is put into service whilecapacitor bank #4 is on line. 17The 115kV circuit breakers at Rotterdam are a mixture of Westinghouse, McGrawEdison, Allis-Chalmers, General Electric, and ABB. The disconnect switches aredeteriorated and many have had problems in the past with breaking or not operatingcorrectly. The original 115kV yard has multiple foundation problems with listing pads17 Report on the Condition of Physical Elements of Transmission and Distribution Systems,” October 1,2009, Page III-73 and III-74.II-2947
Page 1 and 2: Niagara Mohawk Power Corporationd/b
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January 2012 Capital Investment - National Grid

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