Xcel Energy Smaller Scale Transmission Projects

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Xcel Energy Smaller Scale Transmission Projects

• Northern MAPP Subregional Planning Group
• April 3, 2007
• Srinivas Vemuri, Jason Standing, and Daniel Kline

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Small Project Information

• T-Corners Transformer Replacement
• Hyland Lake Dean Lake 115 kV Upgrade
• Woodbury Tanners Lake Upgrade
• Northeast Mankato 69 kV Plan
• South Shakopee Substation
• Ironwood Second Transformer
• Ironwood Bus Upgrade
• Lawrence Second Transformer
• Tracy Switching Station Capacitors
• Keegan Lake Lebanon Hills
• Prescott 10 MVAR Cap Bank

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T-Corners 115/69 kV Transformer Replacement

• Substation currently has two 115/69 kV
  transformers (1 2)
• Tx 1 62.5 MVA
• Tx 2 112 MVA
• Summer 2011 Loss of Transformer 2 will load 1
  to 80 MVA (128)
• Plan to replace existing 62.5 MVA bank with
  matching 112 MVA bank

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T-Corners 115/69 kV Transformer Replacement
T-Corners
Eau Claire Metro Area
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Ironwood Second Transformer

• Ironwood 88/34.5 kV Transformer currently rated
  at 25 MVA
• 78 MW generation at Bayfront Substation
• Loss of Bayfront 115/92 kV transformer sends
  Bayfront generation through 88 34.5 kV systems
• Severely overloads Ironwood Bayfront 88 kV line
• Severely low voltages along Ironwood 34.5 kV
  system
• Add second Ironwood 88/34.5 kV transformer

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Ironwood Second Transformer
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Ironwood Terminal Equipment Upgrade

• Ironwood Bayfront 115 kV conductor rated at 189
  MVA (850 Amps)
• Ironwood 115 kV substation equipment with various
  ratintgs
• 200 Amp CT
• 300 Amp Wave Trap
• 380 Amp Bus
• 400 800 Amp Breakers, 600 Amp Switches
• Outage of Bayfront Saxon Pump 88 kV line loads
  Ironwood 115 kV to 72 MVA (361 Amps)
• Outage of Bayfront 115/92 kV transformer loads
  Ironwood 115 kV to 87 MVA (437 Amps)
• Replace capacity-limiting terminal equipment

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Lawrence Second 112 MVA Transformer

• This project is to add an additional 115/69 kV,
  112 MVA transformer at the Lawrence Substation in
  Sioux Falls. This is needed due to the
  double-circuit outage of the 115 kV line out of
  Split Rock to Cheery Creek.
• In Summer 2011, loss of Split Rock-Cherry Creek
  and Split Rock-West Sioux Falls double-circuit
  outage results in a loading of 145.9 MVA (130.2)
  of the 112 MVA transformer at Lawrence.

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Lawrence Second 112 MVA Transformer
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Tracy SW 12 MVAR CAP

• This project is to replace the existing 5.4 MVAR,
  69 kV cap bank at the Tracy Switching Station
  with a new 12 MVAR cap bank.
• In Summer 2006, for loss of the Lyon County 69 kV
  source, the following buses have low voltage
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• Walnut Grove 0.855 pu
• Tracy SS 0.856 pu
• Lake Sarah 0.860 pu
• Currie 0.872 pu
• Slayton 0.886 pu
• Hadley 0.898 pu
• Lake Wilson 0.905 pu

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Tracy SW 12 MVAR CAP
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Kegan Lake Lebanon Hills 69 kV Line Upgrade

• Reconductor the 3 8 CU section of the Kegan Lake
  Lebanon Hills 69 kV line to at least 48 MVA.
• During 2011 summer peak conditions, the line
  overloads to 110.5 in the base case.

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Kegan Lake Lebanon Hills 69 kV Line Upgrade