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Little Falls Powerhouse Modernization

Little Falls Powerhouse Modernization. Presented by Brian Vandenburg Avista Utilities, Spokane, WA. Welcome to Little Falls. Act of Congress in 1905 Commissioned in 1912 Four units at 9MW each 600ft Spillway. Why Little Falls?. January 2010 Damaged breaker and commutator. July 2006

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Little Falls Powerhouse Modernization

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  1. Little Falls Powerhouse Modernization Presented by Brian Vandenburg Avista Utilities, Spokane, WA

  2. Welcome to Little Falls • Act of Congress in 1905 • Commissioned in 1912 • Four units at 9MW each • 600ft Spillway

  3. Why Little Falls? January 2010 Damaged breaker and commutator July 2006 Damaged breaker and commutator September 2010 Damaged breaker, commutator and generator winding

  4. Little Falls Scoping Vertical vs Horizontal • Payback • Logistics • Foundation Unknowns

  5. Engineering Troubles… • Turnkey Design • In House Design

  6. Little Falls Schedule • Exciter and Breaker Upgrade Completed • Crane Upgrade Completed • New Warehouse Completed • Station Service Infrastructure Upgrade In Construction • Unit 3 Outage July 2014 - Feb 2015 • Station Service Auxiliary Systems Spring 2015 • Unit 1 Outage July 2015 - Feb 2016 • Headgate Upgrade July 2015 - Oct 2015 • Unit 4 Outage July 2016 - Feb 2017 • Spillgate System Upgrade ??? • Unit 2 Outage July 2017 - Feb 2018

  7. Medium Voltage Breakers 4kV Breaker Upgrade Uprated the generator breakers and buswork

  8. Excitation System Exciter System Upgrade Amplidyne & Rotational Exciters replaced with Static Excitation System

  9. Crane Upgrade Replaced motors for all four motions. New cab and radio controls.

  10. Dealing with a small powerhouse Loading bay inside the plant is only 20ft wide, making logistics challenging

  11. Long Lake Warehouse The Long Lake Warehouse was built 8 miles from Little Falls to be shared between the two plants

  12. Station Service Upgrade New transformers, low voltage switchgear and motor control centers are being installed. Designed for future expansion.

  13. How to Get Funding Original Little Falls generator half and turbine being delivered to site STILL IN SERVICE!

  14. Generator Replacement Generator frame design to ‘LOOK’ like the old frame as much as possible

  15. Unit Upgrades: A Quick Look • Replacing 9MVA generators with 12MVA generators • Replacing turbines on units 1, 3 & 4. • New PLC-based governor and HPU system on all four units • Protection and Controls Upgrade • New generator cables • Rebabbit generator and turbine bearings • Reinsulate field poles to class F • Flow monitoring • Aux System overhaul: Bearing Oil system, Brakes, Vacuum BKR, Wicket gate resleeving and painting

  16. Little Falls HED, circa 1915

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