sce&g transmission planning summit - … hydro 10mw coit turbines 32mw ... transformer connected...
TRANSCRIPT
““Power For LivingPower For Living””SCE&G Transmission PlanningSCE&G Transmission Planning
SCE&G Transmission Planning SummitSCE&G Transmission Planning Summit
SCE&G Transmission Planning
Summit
February 20, 2007
““Power For LivingPower For Living””SCE&G Transmission PlanningSCE&G Transmission Planning
SCE&G Transmission Planning SummitSCE&G Transmission Planning Summit
Logistical Information
• Sign-In• Exits• Restrooms• Lunch• Meeting Materials
““Power For LivingPower For Living””SCE&G Transmission PlanningSCE&G Transmission Planning
SCE&G Transmission Planning SummitSCE&G Transmission Planning Summit
Order 890
• Reforms Order 888 (Open Access Order)• Approved by the FERC February 15, 2007• More open and transparent Local and Regional
Transmission Planning Process– Open to all transmission users
• Wholesale customers• Generators• Marketers
““Power For LivingPower For Living””SCE&G Transmission PlanningSCE&G Transmission Planning
SCE&G Transmission Planning SummitSCE&G Transmission Planning Summit
Meeting Purpose
Increase understanding of:• SCE&G Transmission System Facts• SCE&G Transmission Planning Process
– Internal Planning– Regional Planning
• SCE&G Transmission System capabilities and limitations
• SCE&G Transmission Expansion Plan
““Power For LivingPower For Living””SCE&G Transmission PlanningSCE&G Transmission Planning
SCE&G Transmission Planning SummitSCE&G Transmission Planning SummitAgendaWelcome and Opening RemarksTransmission Planning Objectives and System FactsPower System Modeling
Load ForecastingModel Development
Internal Planning ProcessPlanning CriteriaBreakTransmission Expansion Drivers
Regional Planning ProcessJoint Study Activities
LunchSCE&G Transmission Expansion PlanClosing Comments
““Power For LivingPower For Living””SCE&G Transmission PlanningSCE&G Transmission Planning
SCE&G Transmission Planning SummitSCE&G Transmission Planning Summit
Transmission Planning Objectives andSystem Facts
““Power For LivingPower For Living””SCE&G Transmission PlanningSCE&G Transmission Planning
SCE&G Transmission Planning SummitSCE&G Transmission Planning Summit
Transmission Planning Objectives
Identify transmission expansion and modifications to safely, reliably and economically:– transmit electric power from SCE&G generators to SCE&G
customers– transmit electric power from off-system purchases to
SCE&G customers– provide Interconnection Service to all generators– provide Transmission Service to marketers and generators– maintain synchronism with the Eastern Interconnection
““Power For LivingPower For Living””SCE&G Transmission PlanningSCE&G Transmission Planning
SCE&G Transmission Planning SummitSCE&G Transmission Planning Summit
SCE&G Transmission System FactsLinesVoltages Miles230 kV 1136115 kV 168346 kV (sub-transmission) 68833 kV (sub-transmission) 70
Total 3577
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SCE&G Transmission Planning SummitSCE&G Transmission Planning Summit
SCE&G Transmission System FactsSubstationsType #Generation (Step-up) 20Transmission 43Distribution 201Single Customer 181Total 445
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SCE&G Transmission Planning SummitSCE&G Transmission Planning SummitSCE&G Transmission System Facts
Transmission Interties 230kV 115kV
Duke 2 2Progress Energy Carolinas 2 1Santee Cooper 7 5Southern (Georgia Power) 1 1SEPA 0 1
12 10
Total Interties 22
““Power For LivingPower For Living””SCE&G Transmission PlanningSCE&G Transmission Planning
SCE&G Transmission Planning SummitSCE&G Transmission Planning Summit
Transmission IntertiesDuke
SEPA
Southern
Progress Energy
Santee Cooper
““Power For LivingPower For Living””SCE&G Transmission PlanningSCE&G Transmission Planning
Stevens Creek 18MW
Urquhart 598MW
UrquhartTurbines 103MW
BurtonTurbines
30MW Hardeeville
Turbine 15MW
Jasper875MW
HagoodICT
96MW
Williams615MW
WilliamsTurbines
56MW
Canadys 406MW
Canadys Turbines
15MW
Columbia Hydro 10MW
Coit Turbines
32MW
Summer966MW
(644MW)
Saluda Hydro206MW
McMeekin250MW
Parr Hydro 14MW
Fairfield576MW
ParrTurbine 64MW
Faber PlaceTurbines
9MW
Cope420MW
Columbia Energy Center 620MW
Westvaco90MW
SCE&G Transmission Planning SummitSCE&G Transmission Planning Summit
Connected Generation(6682 MW)
““Power For LivingPower For Living””SCE&G Transmission PlanningSCE&G Transmission Planning
SCE&G Transmission Planning SummitSCE&G Transmission Planning Summit
SCE&G Generation Queue(next 10 Years)
• 2 Nuclear Units• 1 Coal Unit• 9 Combustion Turbines
Total – 4257 MW
““Power For LivingPower For Living””SCE&G Transmission PlanningSCE&G Transmission Planning
SCE&G Transmission Planning SummitSCE&G Transmission Planning Summit
Power System Modeling
Load Forecasting
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Dispersed Substation Load Forecast contains for each transformer connected to the Transmission System:
• SCE&G is normally summer peaking• SCE&G creates a summer and winter forecast• Peak Transformer Loads for Prior Ten Years• Current Year Peak Transformer Load• Projected Load Increases for Upcoming 10 Years
SCE&G Transmission Planning SummitSCE&G Transmission Planning Summit
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Load Information Gathering
• Contact the Metering Department after the summer peak –Normally mid September
• Request 15 Minute metered readings for each transformer• Receive data and tabulate into prior 10 year forecast• Data added includes peak MW and MVAR• Spreadsheet calculates Peak MVA
SCE&G Transmission Planning SummitSCE&G Transmission Planning Summit
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Lexington Westside 115-23kv Transformer #1 - Sub #281 - 37.3MVA
Historical Summer Load (MVA) Projected Load Increase (MVA)
1996 22.0 2007 1.01997 24.1 2008 1.01998 24.6 2009 0.51999 27.8 2010 0.52000 22.6 2011 0.52001 29.0 2012 0.52002 31.3 2013 0.52003 30.0 2014 0.52004 33.4 2015 0.52005 37.0 2016 0.52006 37.1
2007 Calculated Peak 38.1MVA2007 Percent Loaded 102%
SCE&G Transmission Planning SummitSCE&G Transmission Planning Summit
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Lexington Westside 115/23kV #1
0
5
10
15
20
25
30
35
40
45
1996
1998
2000
2002
2004
2006
2008
2010
2012
2014
2016
Year
Load
(MVA
)
Load (MVA)Capacity
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Initial Review
• Compare the most recent peak load for consistency with prior year’s peaks
• Expect plus or minus 5%-10% of prior year• Consider weather conditions and local area growth• For variations above 10% check load against monthly
SCADA readings taken by Distribution• Adjust loads if load switching occurred• Project load increases on each transformer year by year for
the upcoming 10 years
SCE&G Transmission Planning SummitSCE&G Transmission Planning Summit
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Review By SCE&G Distribution Group
• Forward electronic copy to Local Managers and Distribution Planning for comments
• Request review for accuracy of the peak load• Request review of anticipated step load additions in MW
for the next 10 years for each transformer• Receive comments, discuss further as necessary with
Distribution• Make adjustments to the 10 year forecast
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Information from Industrial Customers
• Contact Manager of the Large Industrial Group• Request customers be contacted for known load
additions/reductions over the next 10 years• Incorporate into the 10 year Forecast
SCE&G Transmission Planning SummitSCE&G Transmission Planning Summit
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Information from Industrial Development
• Contact Manager of Industrial Development• Identify all potential new Industrial Customers and expected
10 year load forecast• Incorporate appropriate customer loads into the 10 year
Forecast
SCE&G Transmission Planning SummitSCE&G Transmission Planning Summit
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Information from Wholesale Customers
• Contact Manager of Transmission Services• Request annual 10 year forecast for Summer and Winter
for each Wholesale Customer• Incorporate Wholesale Customer loads into the 10 year
Forecast
SCE&G Transmission Planning SummitSCE&G Transmission Planning Summit
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Internal Review
• Meet with other Transmission Planners• Review Entire Document for Consistency• Receive Corporate 10 year forecast and align to agree –
Wholesale and Industrial Customer Load Projections are not adjusted
• Archive• Provide results for internal Model Development
SCE&G Transmission Planning SummitSCE&G Transmission Planning Summit
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SCE&G Transmission Planning SummitSCE&G Transmission Planning Summit
Power System Modeling
Model Development
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SCE&G Transmission Planning SummitSCE&G Transmission Planning Summit
Model Components• Generators • Capacitors• Transmission Lines • Reactors• Transformers • Breakers• Load • FACTS Devices• Firm Power Transfers • etc.
““Power For LivingPower For Living””SCE&G Transmission PlanningSCE&G Transmission Planning
SCE&G Transmission Planning SummitSCE&G Transmission Planning SummitTypes of Models and their Application• Power Flow Models
– Predict Future Transmission Expansion– Analyze thermal loading and voltages– Test Transfer Capability
• Stability Models– Criteria Testing– Generator Interconnection– FSAR
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SCE&G Transmission Planning SummitSCE&G Transmission Planning SummitTypes of Models and their Application• Short Circuit Models
– Calculate Available Fault Current– Breaker Evaluation, Equipment Sizing and Motor Start
Analysis– Grounding Design
• Loss Factor Models– Determine SCE&G System Losses
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SCE&G Transmission Planning SummitSCE&G Transmission Planning SummitModel Development - Internal• Dispersed substation load forecast
– Summer/Winter Peak, Off-Peak and Seasonal Load Levels• Existing generation
– Input from Generation Maintenance Schedule• Generation additions
– Input from Generation Expansion Plan• Transmission additions
– Input from Planners and Engineering• Firm Transmission Service
– Input from OASIS, Coordinate with Neighbor
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SCE&G Transmission Planning SummitSCE&G Transmission Planning Summit
Model Development - External• SERC
– SERC Databank Update• SCE&G • Southern Company• Duke Power • GTC• Progress Energy – Car. • MEAG• Santee Cooper • TVA• Virginia Power • Entergy• Ameren • Others
– Develop Southeastern models for the next ten years
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SCE&G Transmission Planning SummitSCE&G Transmission Planning Summit
SERC Region
““Power For LivingPower For Living””SCE&G Transmission PlanningSCE&G Transmission Planning
SCE&G Transmission Planning SummitSCE&G Transmission Planning SummitModel Development - External• Eastern Interconnection
– NERC• SERC and five other NERC Regions• Includes transmission systems from Florida to North Dakota and from
Eastern New Mexico (parts of Texas) to Maine• Includes transmission systems in Canada from Nova Scotia to
Saskatchewan– Develop Eastern Interconnection models for the next ten years– All participants receive a copy of the final models
These Eastern Interconnection models are the models used to planthe SCE&G Transmission System
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SCE&G Transmission Planning SummitSCE&G Transmission Planning Summit
NERC
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SCE&G Transmission Planning SummitSCE&G Transmission Planning Summit
SCE&G Internal Planning Process
Planning Criteria
““Power For LivingPower For Living””SCE&G Transmission PlanningSCE&G Transmission Planning
SCE&G Transmission Planning SummitSCE&G Transmission Planning SummitPlanning Standards• North American Electric Reliability Council
(NERC/ERO)– Originally developed in 1996– Ongoing revisions since– Currently being reviewed and revised by FERC– EPAct 2005 made these standards the law
• Non-compliance penalties up to $1,000,000 per day
• SCE&G Internal Planning Criteria– Developed in 1970
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SCE&G Transmission Planning SummitSCE&G Transmission Planning SummitCriteria TestingThese criteria can be briefly summarized as:
• The SCE&G Transmission System is planned such that if a transmission, generation or load event suddenly occurs, the response of the system will be within acceptable limits and stability is maintained.
• In case a sudden event occurs:– system voltages must be maintained– all transmission facility loadings are less than the applicable rating– system stability and synchronism are maintained
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SCE&G Transmission Planning SummitSCE&G Transmission Planning Summit
Criteria Testing• A sample of events simulated are:
– Loss of any generating unit– Loss of any transmission line– Loss of any transmission transformer– Loss of any electrical bus section and connected facilities– Loss of entire generating capacity in any one plant– Loss of all circuits on a common transmission structure– Loss of any generator, line or transformer, followed by system
adjustments, and then the loss of another generator, line or transformer
– etc.
““Power For LivingPower For Living””SCE&G Transmission PlanningSCE&G Transmission Planning
SCE&G Transmission Planning SummitSCE&G Transmission Planning SummitPlanning Cycle
Year 20nnBase CaseYear 20nnBase Case
CriteriaTestingCriteriaTesting
AlternativeDevelopmentAlternative
DevelopmentCost/Benefit
AnalysisCost/Benefit
Analysis
SolutionSelectionSolutionSelection
ManagementApproval
ManagementApproval
TransmissionExpansion
Plan for 20nn
TransmissionExpansion
Plan for 20nnYear + 1Year + 1
““Power For LivingPower For Living””SCE&G Transmission PlanningSCE&G Transmission Planning
SCE&G Transmission Planning SummitSCE&G Transmission Planning Summit
Break
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SCE&G Transmission Planning SummitSCE&G Transmission Planning Summit
SCE&G Internal Planning Process
Transmission Expansion Drivers
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SCE&G Transmission Planning SummitSCE&G Transmission Planning Summit
Transmission Expansion Drivers• Develop 10 year transmission expansion plan based on:
– Criteria testing– Distribution needs– Industrial Customer needs– Network/Wholesale Customer needs– Generator Interconnection needs– Firm Transmission Service needs– Actual system performance (poor performance)
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Transmission Planning ProcessTransmission Planning ProcessSCE&G Internal PlanningSCE&G Internal Planning
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SCE&G Transmission Planning SummitSCE&G Transmission Planning Summit
Regional Planning Process
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Regional Planning - Regional Reliability Agreements
• The Southern Companies and Entergy 1967• Tennessee Valley Authority (TVA) and Southern 1968• TVA and Entergy 1968• Virginia-Carolinas (VACAR) 1970• VACAR and Southern 1971• TVA and Carolina Power & Light (CP&L) 1971• Southern and Florida Coordinating Group (FCG) 1980• TVA and Oglethorpe Power Corporation (OPC) 1994• TVA & Municipal Electric Authority of Georgia 2000
SCE&G Transmission Planning SummitSCE&G Transmission Planning Summit
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Regional Planning - Regional Reliability Agreements
• The purpose of the Reliability Agreements is to augment further the reliability of each party’s bulk power system
• The Reliability Agreements require, among other things, that theparties– exchange information within the Region– conduct joint studies and investigations– coordinate voltages and reactive interchange– make necessary recommendations designed to increase reliability of the
interconnected bulk power system
SCE&G Transmission Planning SummitSCE&G Transmission Planning Summit
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• Focus on the interaction between systems and the impact of that interaction on the reliability of serving load
• Focus on the ability to transfer power between systems for reliability and economic purposes
SCE&G Transmission Planning SummitSCE&G Transmission Planning Summit
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SCE&G Transmission Planning SummitSCE&G Transmission Planning Summit
Planning Arenas
• Individual System Planning• Subregional System Planning
– Facilitated Planning– Coordinated Planning– Joint Planning
• Regional System Planning– Facilitated Planning– Coordinated Planning– Joint Planning
VACAR
ProgressCarolina
DominionVP
DukeSCE&G
SCPSA
ENTERGY
GATEWAY
TVA SOUTHERN
SERC
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SCE&G Transmission Planning SummitSCE&G Transmission Planning Summit
Regional Planning Process
VACAR (Virginia and Carolinas)SCE&G Santee Cooper Progress Energy CarolinasDuke Virginia Power Fayetteville, NCNCEMC SEPA Yadkin, Inc
VACAR Studies– Future year planning studies– Criteria testing– Power Transfer Capability
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SCE&G Transmission Planning SummitSCE&G Transmission Planning Summit
VACAR Subregion
SEPA
SCPSA
DUKEPECw
YADKIN
VP
PECe
SCE&G
NCEMC
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SCE&G Transmission Planning SummitSCE&G Transmission Planning Summit
Regional Planning Process
SERC - Long-term Studies– Future year planning studies– Criteria testing– Power Transfer Capability
SERC - Near-term Studies– Seasonal reliability studies (summer and winter)– Used by System Operators to predict system performance and
system constraints for the upcoming season
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SCE&G Transmission Planning SummitSCE&G Transmission Planning Summit
SERC Region
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SCE&G Transmission Planning SummitSCE&G Transmission Planning Summit
Regional Planning Process
SERC Inter-regional Studies– SERC – Reliability First– SERC – MRO– SERC – SPP– SERC – Florida
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SCE&G Transmission Planning SummitSCE&G Transmission Planning Summit
NERC
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SCE&G Transmission Planning SummitSCE&G Transmission Planning Summit
Transfer Capabilities and Limits
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SCE&G Transmission Planning SummitSCE&G Transmission Planning SummitPower Transfer CapabilitiesOASIS Support Studies
– Transfer Capability Studies– Commercially viable transfer values– Used to populate the SCE&G OASIS– SCE&G Transfer Capabilities Calculated (Import and Export
values):• Duke• Progress Energy Carolinas• Santee Cooper• Southern Company
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ATC Calculations – Imports and Exports
Definitions and Formulas:
Total Transfer Capability (TTC) = First Contingency Incremental Transfer Capability (FCITC)
Transmission Reliability Margin (TRM) = Margin to ensure system is operated reliably
Capacity Benefit Margin (CBM) = Margin to ensure connected LSEs have access to external generation resources
Available Transfer Capability (ATC) = TTC – TRM – CBM – Committed Uses
SCE&G Transmission Planning SummitSCE&G Transmission Planning Summit
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TTC
Non Firm ATC
Firm ATC
CBM
TRM
CommittedUses
Available Transfer Capability (ATC) = TTC – TRM – CBM – Committed Uses
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SCE&G Transmission Planning SummitSCE&G Transmission Planning Summit
2007 Summer Firm ATC - Imports
Transfer Firm ATC (MW)
PEC to SCE&G 523
Duke to SCE&G 542
SCPSA to SCE&G 381
Southern to SCE&G 1203
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SCE&G Transmission Planning SummitSCE&G Transmission Planning Summit
2007 Summer Firm ATC - Exports
Transfer Firm ATC (MW)
SCE&G to PEC 694
SCE&G to Duke 860
SCE&G to SCPSA 600
SCE&G to Southern 970
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SCE&G Transmission Planning SummitSCE&G Transmission Planning Summit
Lunch
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SCE&G Transmission Planning SummitSCE&G Transmission Planning Summit
SCE&G Transmission Expansion Plan
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SCE&G Transmission Planning SummitSCE&G Transmission Planning Summit
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Major Transmission Projects1) Lake Murray 230/115 Sub
2) Hopkins 230/115 Sub3) Landfill Switching
Sta.4) Denny Terrace –
Lyles 230kV Line5) Pepperhill 230/115
Sub and Lines6) Church Creek –
Savage Road 115kV Double Circuit
7) Accabee-Charlotte St. 115kV Double Circuit and Foldin at Hagood
8) Mt. Pleasant Area Improvements
9) Canady – Church Creek 230kV Double Circuit and Fold-in at Pepperhill
10) Barnwell-SRS 115kV Line
11) Urquhart – Belvedere 115kV Double Circuit
12) Graniteville 230/115kV Transformer Upgrade
13) Yemassee 230/115kV Transformer Upgrade
14) Yemassee – Burton 115kV Double Circuit
15) Ritter 230/115kV Sub
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SCE&G Transmission Planning SummitSCE&G Transmission Planning SummitColumbia Area
• Load: 1900 MW• Generation: 3516 MW
– SCE&G: 2582 MW– Santee Cooper: 322 MW– IPP: 612 MW
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SCE&G Transmission Planning SummitSCE&G Transmission Planning Summit
Columbia Area Major Transmission Projects
• Lake Murray 230/115 kV Transmission Substation• Hopkins 230/115 kV Transmission Substation • Landfill 115 kV Switching Station and Capacitor Bank• Denny Terrace-Pineland 230 kV Line and add Pineland 230/115 kV #2
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SCE&G Transmission Planning SummitSCE&G Transmission Planning SummitLake Murray 230/115 kV Transmission Substation and Lines
• Problem:– Contingency:
• Outage of the Denny Terrace 230/115kV #1 and the Lyles 230/115kV #1 transformers
• 16 other events cause problems– Result:
• Overloaded transformers and 115kV transmission lines in the Columbia and Lake Murray area
• Other overloaded facilities and low voltages
““Power For LivingPower For Living””SCE&G Transmission PlanningSCE&G Transmission Planning
SCE&G Transmission Planning SummitSCE&G Transmission Planning SummitLake Murray 230/115 kV Transmission Substation and Lines
• Solution:– Construct 230/115kV Sub at Lake Murray with 336MVA Transformer– Fold-in V.C. Summer-Edenwood 230kV Line at Lake Murray– Fold-in Saluda Hydro-Cromer Road and McMeekin-Lyles 115kV Lines– Construct new 115kV Line from Lake Murray to Lexington Sub
• Benefits:– Provides up to 336 MVA Continuous Transformation from 230 to 115kV– Supports Denny Terrance and Lyles 230-115kV Transformation and
downtown 115kV corridor– Supports Lexington Area– Supports NW Columbia (Irmo, Whitehall, and Woodland Hills)
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SCE&G Transmission Planning SummitSCE&G Transmission Planning SummitHopkins 230/115 kV Transmission Substation and Lines
• Problem:– Contingency:
• Outage the Columbia Industrial Park 230/115kV transformer and the Columbia Industrial Park-Edenwood 115kV Line
• 6 other events cause problems– Result:
• Overload the Saluda to Columbia Industrial Park 115kV line• Other overloaded facilities
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SCE&G Transmission Planning SummitSCE&G Transmission Planning SummitHopkins 230/115 kV Transmission Substation and Lines
• Solution:– Construct 230/115kV Sub at Hopkins with 336MVA Transformer– Fold-in to the Wateree-Columbia Energy Center 230kV line– Re-terminate the Veridian-Westinghouse 115kV line at Hopkins– Re-terminate Westinghouse-Square D tap 115kV line at Hopkins– Construct a new 115kV Line from Hopkins-Westinghouse tap (near East Columbia
tap)– Upgrade 115kV line from Westinghouse tap-Master Foods tap
• Benefits:– Provides additional 336 MVA 230/115kV transformation for the East Columbia area– Supports Columbia Industrial Park and Edenwood 230/115kV transformation
““Power For LivingPower For Living””SCE&G Transmission PlanningSCE&G Transmission Planning
SCE&G Transmission Planning SummitSCE&G Transmission Planning SummitLandfill 115kV Station with Breakers and 36MVAR Capacitor Bank
• Problem:– Contingency:
• Outage the Edenwood-Dunbar Road 115kV and the Lexington Junction-Lexington Industrial Park 115kV
– Result:• Low voltages in the Lexington area
““Power For LivingPower For Living””SCE&G Transmission PlanningSCE&G Transmission Planning
SCE&G Transmission Planning SummitSCE&G Transmission Planning SummitLandfill 115kV Station with Breakers and 36MVAR Capacitor Bank
• Solution:– Construct a 115kV Switching Station with (3) Breakers– Add 36 MVAR Capacitor Bank
• Benefits:– Provide voltage support– Automate switching capability
““Power For LivingPower For Living””SCE&G Transmission PlanningSCE&G Transmission Planning
SCE&G Transmission Planning SummitSCE&G Transmission Planning SummitDenny Terrace to Pineland 230 kV Line and add Pineland 230/115 kV #2
• Problem:– Contingency:
• Loss of the VC Summer-Pineland 230kV line and Wateree-Pontiac 230kV line
• 1 other event causes problems
– Result:• Overload the Denny Terrace-Pineland 115kV line• Low voltage in the Northeast Columbia Area
““Power For LivingPower For Living””SCE&G Transmission PlanningSCE&G Transmission Planning
SCE&G Transmission Planning SummitSCE&G Transmission Planning SummitDenny Terrace to Pineland 230 kV Line and add Pineland 230/115 kV #2
• Solution:– Construct a Denny Terrace-Pineland 230kV line– Add a 2nd 336 MVA transformer at Pineland
• Benefits:– Provide an additional 230kV source into the Northeast Columbia
Area– Provide additional 230/115kV transformation
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SCE&G Transmission Planning SummitSCE&G Transmission Planning Summit
Charleston Area• Load: 1600 MW• Generation: 857 MW
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SCE&G Transmission Planning SummitSCE&G Transmission Planning Summit
Charleston Area Major Transmission Projects
• Pepperhill - Add 230/115kV Transformer and fold-in 115kV lines • Church Creek – Savage Road 115kV Double Circuit Line• Accabee – Charlotte St. 115kV Double Circuit and Fold-in at Hagood• Mt. Pleasant Area Improvement• Canady – Church Creek 230kV Double Circuit and Fold-in at Pepperhill
““Power For LivingPower For Living””SCE&G Transmission PlanningSCE&G Transmission Planning
SCE&G Transmission Planning SummitSCE&G Transmission Planning SummitPepperhill - Add 230/115kV Transformer and fold-in 115kV lines
• Problem:– Contingency:
• Summerville 230/115kV transformer #1 and Goose Creek-Ashley Phosphate115kV line
• 4 other events cause problems
– Result:• Overload the Summerville 230/115kV transformer #2• Other overloaded facilities
““Power For LivingPower For Living””SCE&G Transmission PlanningSCE&G Transmission Planning
SCE&G Transmission Planning SummitSCE&G Transmission Planning SummitPepperhill - Add 230/115kV Transformer and fold-in 115kV lines
• Solution:– Pepperhill – Add 230/115kV 336 MVA transformer – Fold-in the existing Summerville-Goose Creek 115kV line at Pepperhill.
Upgrade the fold-in to 1272 ACSR. – Construct a new 115kV line and re-terminate Robert Bosch at Pepperhill.
• Benefits:– Provide additional 230/115kV support to the Summerville and Goose Creek
Areas.– Postpone several transmission upgrades in the Summerville Area.
““Power For LivingPower For Living””SCE&G Transmission PlanningSCE&G Transmission Planning
SCE&G Transmission Planning SummitSCE&G Transmission Planning SummitChurch Creek – Savage Road 115kV Double Circuit Line
• Problem:– Contingency:
• Church Creek-Savage Road 115kV line and Hagood-Grove Street 115kV line
– Result:• Overload the Accabee-Meeting Street 115kV line
““Power For LivingPower For Living””SCE&G Transmission PlanningSCE&G Transmission Planning
SCE&G Transmission Planning SummitSCE&G Transmission Planning SummitChurch Creek – Savage Road 115kV Double Circuit Line
• Solution:– Construct a double circuit 115kV line from Church Creek-Savage
Road. Dedicate one circuit to Savage Road Load only. The second circuit will feed St. Andrews Road Sub.
• Benefits:– Remove 50 MW of load from heavily loaded Church Creek-Bee
Street 115kV line.
““Power For LivingPower For Living””SCE&G Transmission PlanningSCE&G Transmission Planning
SCE&G Transmission Planning SummitSCE&G Transmission Planning SummitAccabee – Charlotte St. 115kV Double Circuit and Fold-in at Hagood
• Problem:– Contingency:
• Outage the Hagood-Grove Street 115kV line and the Church Creek-Stono Park 115kV line
– Result:• Overload Accabee-Charlotte Street 115kV line
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SCE&G Transmission Planning SummitSCE&G Transmission Planning SummitAccabee – Charlotte St. 115kV Double Circuit and Fold-in at Hagood
• Solution:– Construct a 115kV double circuit line from Accabee to Charlotte
Street. Fold-in one of the circuits at Hagood Plant.
• Benefits:– Provides an additional 115kV source line to support the downtown
Charleston load.– Provides Hagood generation an additional path to serve eastern part
of the downtown Charleston area.
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SCE&G Transmission Planning SummitSCE&G Transmission Planning SummitMt. Pleasant Area Improvement
• Problem:– Contingency:
• Outage the AM Williams-Mt Pleasant 115kV #1 and #2 lines• 3 other events cause problems
– Result:• Overload the Charlotte Street-Mt Pleasant 115kV line
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SCE&G Transmission Planning SummitSCE&G Transmission Planning SummitMt. Pleasant Area Improvement
• Solution:– Construct Thomas Island-Hobcaw 115kV line segment – Construct Osceola Tap-Hamlin 115kV line– Upgrade a section of the Charlotte Street-Bayview 115kV line to larger conductor
• Benefits:– Create an additional 115kV source to support the Mt Pleasant Area
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SCE&G Transmission Planning SummitSCE&G Transmission Planning SummitCanady – Church Creek 230kV Double Circuit and Fold-in at Pepperhill
• Problem:– Contingency:
• Outage AM Williams 230kV Generation and Pepperhill-Mateeba 230kV line• 2 other events cause problems
– Result:• Overload Canady-Church Creek 230kV line• Other overloaded facilities
““Power For LivingPower For Living””SCE&G Transmission PlanningSCE&G Transmission Planning
SCE&G Transmission Planning SummitSCE&G Transmission Planning SummitCanady – Church Creek 230kV Double Circuit and Fold-in at Pepperhill
• Solution:– Reconstruct and upgrade the Canady-Church Creek 230kV line as
double circuit. Fold-in one of the circuits at Pepperhill.
• Benefits:– Provide additional 230kV source to support the Charleston Area.– Eliminate overloaded lines into the Charleston Area.
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SCE&G Transmission Planning SummitSCE&G Transmission Planning Summit
Other Areas
• Load: 1500 MW• Generation: 2,418 MW
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SCE&G Transmission Planning SummitSCE&G Transmission Planning SummitMajor Transmission Projects
• Barnwell – SRS 115kV Line• Urquhart – Belvedere 115kV Double Circuit• Graniteville – Add 230/115kV #3 transformer• Yemassee – Add 230/115kV #3 transformer• Yemassee – Beaufort 115kV Double Circuit• Ritter – Add 230/115 kV transformer
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SCE&G Transmission Planning SummitSCE&G Transmission Planning SummitBarnwell – SRS 115kV Line
• Problem:– Contingency:
• Outage the Cope to Denmark115kV line and the Salem to Barnwell 115kV line
• 4 other events cause problems– Result:
• Low Voltage in the Barnwell Area
““Power For LivingPower For Living””SCE&G Transmission PlanningSCE&G Transmission Planning
SCE&G Transmission Planning SummitSCE&G Transmission Planning SummitBarnwell – SRS 115kV Line
• Solution:– Construct SRS to Barnwell 115kV line
• Benefits:– Provides an additional 115kV source to support the
Barnwell/Denmark Area.
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SCE&G Transmission Planning SummitSCE&G Transmission Planning SummitUrquhart – Belvedere 115kV Double Circuit
• Problem:– Contingency:
• Outage the Urquhart to Graniteville 230kV line and the Urquhart to Langley 115kV line
• 3 other events cause problems
– Result:• Overload the Urquhart to Belvedere Switching Station 115kV line• Other overloaded facilities
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SCE&G Transmission Planning SummitSCE&G Transmission Planning SummitUrquhart – Belvedere 115kV Double Circuit
• Solution:– Reconstruct the Urquhart-Belvedere Switching 115kV line as double
circuit
• Benefits:– Provides Belvedere and Graniteville stronger 115kV support from
Urquhart
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SCE&G Transmission Planning SummitSCE&G Transmission Planning SummitGraniteville – Add 230/115kV #3 transformer
• Problem:– Contingency:
• Outage one of the Graniteville 230/115kV transformers and the Graniteville-Ward 230kV line
• 4 other events cause problems
– Result:• Overload the remaining Graniteville 230/115kV transformer
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SCE&G Transmission Planning SummitSCE&G Transmission Planning SummitGraniteville – Add 230/115kV #3 transformer
• Solution:– Add Graniteville 230/115kV #3 transformer
• Benefits:– Provides additional 336 MVA of 230/115kV transformation at
Graniteville
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SCE&G Transmission Planning SummitSCE&G Transmission Planning SummitYemassee – Add 230/115kV #3 transformer
• Problem:– Contingency:
• Outage the Yemassee 230kV Bus #2• 1 other event causes problems
– Result:• Overload the Yemassee 230/115kV transformer #1
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SCE&G Transmission Planning SummitSCE&G Transmission Planning SummitYemassee – Add 230/115kV #3 transformer
• Solution:– Add Yemassee 230/115kV #3 transformer
• Benefits:– Provides additional 230/115kV 336 MVA source to Yemassee
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SCE&G Transmission Planning SummitSCE&G Transmission Planning SummitYemassee – Beaufort 115kV Double Circuit
• Problem:– Yemassee-Beaufort 115kV #1 and #2 lines are two of the most operated
lines on SCE&G’s transmission system
– Contingency:• Outage of the Yemassee-Beaufort 230kV line and the Yemassee-
Beaufort 115kV line #2• 3 other events cause problems
– Result:• Overload the Yemassee-Beaufort 115kV line #1
““Power For LivingPower For Living””SCE&G Transmission PlanningSCE&G Transmission Planning
SCE&G Transmission Planning SummitSCE&G Transmission Planning SummitYemassee – Beaufort 115kV Double Circuit
• Solution:– Reconstruct the Yemassee-Beaufort 115kV line #2 as double circuit
• Benefits:– Provides additional 115kV support to the Beaufort Area.– Replaces poor performing lines
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SCE&G Transmission Planning SummitSCE&G Transmission Planning SummitRitter 230/115 kV Transmission Substation
• Problem:– Contingency:
• Outage the Canadys-Forest Hills 115kV line and the Church Creek-Rantowles 115kV line
• 2 other events cause problems
– Result:• Overload the Yemassee-Ritter 115kV line• Low Voltage in the Walterboro and Adams Run Area
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SCE&G Transmission Planning SummitSCE&G Transmission Planning SummitRitter 230/115 kV Transmission Substation
• Solution:– Add Ritter 230/115kV transformer at the existing Ritter 115kV
Substation
• Benefits:– Provides an additional 115kV source to the Walterboro and Adams
Run Area.– Improve voltage condition during contingencies