The Dalles Dam Station Service Improvements

Overview

Olsson Industrial Electric, OS Engineering and Olsson Controls completed a comprehensive modernization of the station service electrical distribution system at The Dalles Dam, a 2100 MW hydroelectric power generation facility, as the prime contractor. Olsson upgraded the control systems from the original 1950s installation, replaced wire distribution to improve the quality of the cable infrastructure, and connected a secondary power source to create internal redundancy. The electrical upgrades improved turbine control, power generation system efficiency, system reliability and serviceability.

Scope

  • Replaced 4160V station service protective relaying and breaker controls
  • Installed 2 new 5000kVa station service transformers
  • Replaced 13.8kV CLR & vacuum switchgear at main unit Isolated Phase Bus (IBP)
  • Retrofitted five 480V station service substations and MCC sections
  • Installed five new 500kVA transformers, switchgear sections, and 4160V switchgear
  • Retrofitted all existing 4160V switchgear sections
  • Designed, installed and tested redundant DC and preferred AC systems

Highlights

  • Zero safety incident while working in an energized power production facility
  • “Outstanding” performance rating from the U.S. Army Corps of Engineers
Client: U.S. Army Corps of Engineers
Location: Klickitat County, Washington
Timeline: Sept 2008 – Dec 2013
Divisions: Construction, Controls, Engineering
Value: $26,000,000

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