substation asset strategy kevin dasso, senior director engineering and operations
DESCRIPTION
Substation Asset Strategy Kevin Dasso, Senior Director Engineering and Operations IEEE/PES Annual Substations Committee Meeting April 7, 2008. Outline. About PG&E Challenges Project Activities Capital Investment Outlook Trends Bus Conversions Mission Substation Rebuild Questions. !. - PowerPoint PPT PresentationTRANSCRIPT
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Substation Asset Strategy
Kevin Dasso, Senior DirectorEngineering and OperationsIEEE/PES Annual Substations Committee MeetingApril 7, 2008
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Outline
• About PG&E • Challenges• Project Activities• Capital Investment Outlook• Trends• Bus Conversions• Mission Substation Rebuild• Questions
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About PG&E
• PG&E serves 13 million people, or 1 out of every 20 people in the U.S.
• 70,000 Square Miles Service Territory, from Eureka in the north to Bakersfield to the south
• 5 Million Electric Customers
• 4 Million Gas Customers
• Transmission Voltages – 500, 230, 115, 70 & 60 kV
• Distribution Voltages – 35, 21, 17, 12 & 4 kV
• Substations - 748
!
PG&EServiceTerritoryMap
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Electric Transmission Investment Profile
• Fastest-growing area of the business
• Investment driven by:
– System expansions as approved by the California ISO
– Interconnections/upgrades to support new generation
– Replacements, upgrades, and other life extension programs to maintain capacity
– Reduction of grid congestion and Reliability Must Run contracts
– Access to renewable generating resources
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Challenges
• Aging Infrastructure
– Replacements, upgrades, and other life extension programs to maintain line capacity
• “Experienced” workforce
• NERC standards compliance
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Capital Expenditure Outlook
Capital Expenditure Outlook ($MM)
0200400600800
1000
2008 2009 2010 2011 2012
Distribution Substation $245 $207 $209 $206 $206
Transmission Substation $338 $308 $314 $341 $361
Transmission Line $257 $218 $515 $356 $402
Total (in $MM) $840 $733 $1,038 $903 $969
Projected capital expenditures average $900M for years 2008-2012:
($MM)
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Trends
– Capacity growth
– Reliability enhancements
– Aggregation of future planned work at each facility in order to effect wholesale reliability upgrades
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Bus Conversions -- Distribution
– The majority of existing distribution busses are single-bus
• New installations are designed with a ring bus ►
• Major equipment replacement or capacity expansion projects present opportunities to convert to ring bus
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Bus Conversions -- Transmission
– The majority of transmission busses are double-bus / single breaker
• New installations are designed with breaker-and-a-half (BAAH) bus ►
• Major equipment replacement or capacity expansion projects present opportunities to convert to BAAH bus
• Space constraints drive toward GIS technology
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Mission Substation Rebuild
• Many aspects were considered:
– Operating Philosophy– Planned area upgrades– Reliability indexes and Outage statistics– Load balancing on 115 kV sources– Load planning and fault current levels– Available floor space, and construction
sequencing– Construction clearance considerations—
load shifting and switching ability
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Mission Substation Rebuild
• Existing Substation Configuration:
– Built in 1947; expanded in 1958
– Indoor substation with 3 floors
– Four incoming 115 kV underground cables
– 115 kV open-air ring bus and equipment, with wall bushings between rooms
– 12 kV is double-bus switchgear; multi-floor
– 15 radial feeders, 9 network feeders, 14 tie cables
– Three 50MVA and two 35MVA transformers, forced-oil, in separated rooms
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Mission Substation Rebuild
External Building View
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Mission Substation Rebuild
Existing Single Line Diagram – 9 element Ring Bus
BankBankBank
Bank BankLine
Line
Line Line
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Mission Substation Rebuild
Existing Control Room
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Mission Substation Rebuild
• New Substation Configuration:– Rebuild in place, rather than across the street– Replace all existing 12 kV switchgear with new,
compact switchgear (frees up needed floor space)– Increase capacity -- replace the 5 existing
transformers with new 75MVA standard size and add a 6th transformer -- doubles capacity to 450 MVA!
– Reduce fault current levels -- only 2 banks in parallel– Replace 115 kV open air bus with GIS– Replace all relays and control with latest integrated
schemes
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Mission Substation Rebuild
New Single Line Diagram – 6 bay BAAH (2 spare elements)
Line
Bank
Bank
FUT
Line
Bank
Bank
Line
FUT
Bank
Bank
Line
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Mission Substation Rebuild
New Control Room (simulated)
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Mission Substation Rebuild
• Conversion Timeline:– 2007-2009 Switchgear
replacement, in two phases– 2008 Award GIS and EPC
project contract– 2010 Rebuild complete
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Q & A