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Platte Valley Voltage Conversion Project. Customer Meeting April 28, 2010 Torrington, WY. Agenda. Introductions Accomplishments Update on Torrington Area PVVC Overview PVVC Schedule and Cost Estimates Questions/Comments Wrap Up. Accomplishments since 2003. Whiterock Substation (2005)

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Platte Valley Voltage Conversion Project

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Platte Valley Voltage Conversion Project

Customer Meeting

April 28, 2010

Torrington, WY


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Agenda

  • Introductions

  • Accomplishments

  • Update on Torrington Area

  • PVVC Overview

  • PVVC Schedule and Cost Estimates

  • Questions/Comments

  • Wrap Up


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Accomplishments since 2003

  • Whiterock Substation (2005)

  • Lingle Tap (2003)

  • Lyman-Yoder Tap (2005)

  • McGrew area Caps (2005)

  • Stored mobile transformer at Guernsey Rural (2004)

  • Wood Pole Testing and Treatment (2003 & 2004)

  • Letter of Concurrence between Tri-State and Western on Platte Valley conversion project (2005)

  • Glendo Substation Relay System & RTU replacement


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Accomplishment since 2003

  • Gering Station Service Switchgear (2006)

  • Gering PCBs 162, 462, 966 replacement (2006)

  • Glendo PCB 524 (2006)

  • Limestone additions (PCB 442, new control & relay system, new RTU) (2009)

  • Repaired Mobile transformer and returned to Guernsey Rural (2009)


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Upcoming Projects (2008-2011)

  • Torrington transformer KY2A addition (In-service May 2010)

  • Gering-Gering Valley 34.5-kV rebuild (2011)


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Torrington KY2A addition

  • Project to add 115/34.5-kV 50 MVA transformer

  • Joint project with City of Torrington

  • Transformer delivered - Oct 2008

  • Construction contractor complete – Dec 2008

  • Control Design & switchboard delivered

  • Commissioning ongoing


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Platte Valley Voltage Conversion

  • The objective of the Platte Valley Voltage Conversion Project is to convert the operating voltage of the 34.5-kV transmission lines and related facilities between Lingle Substation and Sievers Rural Substation to 69-kV.

  • The lines were rebuilt in the early 90’s to 69-kV standard.


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Platte Valley Voltage Conversion

  • The majority of the work is converting the numerous substations and taps along the line segments to 69-kV.

  • Western and Tri-State signed a Letter of Concurrence in November 2004 laying the initial scope and responsibilities for the upgrades.


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Platte Valley Voltage Conversion

  • Scope:

  • Lingle Substation: Install a 115/69-kV 40 MVA transformer and associated equipment.

  • Torrington Substation: Install a 69/34.5-kV 50 MVA transformer and associated equipment.

  • Sievers Rural Tap: Install a 69/34.5-kV 25 MVA transformer and associated equipment.

  • Construct eleven miles of new 69-kV line between East Morrill Tap and Sievers Rural Tap.


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Platte Valley Voltage Conversion

  • Scope (cont):

  • Torrington Rural Tap: Replace transformer and rebuild high side for 69-kV.

  • Henry Tap: Replace transformer and rebuild high side for 69-kV.

  • Village of Morrill Tap: Make necessary modifications to operate existing dual winding transformer at 69-kV.

  • Connect the Town of Lingle Tap to the Limestone-Lingle 34.5-kV line.


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Platte Valley Voltage Conversion

  • Scope (cont):

  • Estimated Cost: $21M

  • Planned ISD: FY2015

  • Project Manager: Roy Gearhart

  • Current Status: Not planned to start until FY2012. System Studies updated every two years. System Studies planned for 2010.


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Platte Valley Voltage Conversion

  • Major Milestones to date

  • Various System Studies: 2000-2010

  • Meeting with Platte Valley Customers: April 2003

  • Western and Tri-State signed Ltr of Concurrence: November 2004

  • Meeting with Platte Valley Customers: April 2005

  • Meeting with Platte Valley Customers: April 2007

  • Published Platte Valley Voltage Conversion Project Overview: January 23, 2006


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Platte Valley Voltage Conversion

Lingle Substation

Scope:

115kV/69kV 40MVA transformer with high and low side interrupters for protection.

New Substation site required for 115/69kV additions

New Control Building

Schedule: 2012-2015

Estimate: $4,730k (In 2014 $’s)


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Platte Valley Voltage Conversion

Lingle Town

Scope:

Move connection to Limestone 34.5-kV line with ~0.5 mile of new 34.5-kV line.

Schedule: 2012-2015

Estimate: $100k - $200k (no detail estimate done)


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Platte Valley Voltage Conversion

Torrington Rural

Scope:

Convert to 69-kV with a 69kV/12.47kV 5MVA and a 69kV/24.9kV 7.5MVA transformers and 69kV improvements on high side.

Schedule: 2012-2015

Estimate: $1,500k (In 2014 $’s)


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Platte Valley Voltage Conversion

Torrington Substation

Scope:

New 69-kV yard with 4–69kV bays; 69kV/34.5kV 50MVA Transformer; New Control Building; more land.

Schedule: 2012-2015

Estimate: $5,400k (In 2014 $’s)


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Platte Valley Voltage Conversion

Henry

Scope:

Convert to 69-kV with a 69kV/12.47kV 7.5MVA transformer and 69kV improvements on high side.

Schedule: 2012-2015

Estimate: $900k (In 2014 $’s)


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Platte Valley Voltage Conversion

Village of Morrill

Scope:

Convert to 69-kV high side winding on existing 34.5/69/7.2/12.47kV 2.5MVA transformer and 69kV improvements on high side.

Schedule: 2012-2015

Estimate: No estimate done


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Platte Valley Voltage Conversion

East Morrill Tap – Wildcat 69-kV line

Scope:

Construct ~3 miles of new 69-kV line from East Morrill tap to Wildcat. Creates the Lyman-Wildcat 34.5-kV line. Allows Village of Lyman and Lyman Rural loads to remain 34.5-kV

Schedule: 2012-2015

Estimate: $1,395k (in 2012 $’s)


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Platte Valley Voltage Conversion

Wildcat Substation

Scope:

No new additions initially planned at Wildcat. Should the system needs change, the new Torrington-Sievers Rural 69-kV line could be interconnected with the 34.5-kV system at Wildcat to provide system reliability improvements.


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Platte Valley Voltage Conversion

Wildcat-Sievers Rural 69-kV line

Scope:

Construct a new 10 mile 69-kV line between Wildcat and Sievers Rural to bypass Mitchell area.

Bypasses City of Mitchell and Mitchell Rural loads, leaving them at 34.5-kV

Schedule: 2012-2015

Estimate: $4,045K


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Platte Valley Voltage Conversion

Sievers Rural

Scope:

69/34.5kV 20 MVA transformer with high and low side protection; new control building; land.

Sievers Rural load remains served at 34.5-kV.

Schedule: 2012-2015

Estimate: $2,250k (In 2014 $’s)


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Wrap Up

  • Questions or Comments?


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Thank You

  • Contacts

    • Bob Easton (Western)

      • 970-461-7272 or aeaston@wapa.gov

    • Roy Gearhart (Western)

      • 970-461-7333 or rgearhar@wapa.gov

    • Stan Lawrenson (Tri-State)

      • 303-254-3452 or slawrenson@tristategt.org


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