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138kV – Collins Ferry – Lake Lynn Reconductor

138kV – Collins Ferry – Lake Lynn Reconductor
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This project included the reconductor of (6.8) miles of 138kV between Lake Lynn and West Run Substations.
After modeling the proposed conductor, Realtime performed an in-depth analysis of the existing steel lattice structures and arrived at the following scope of work:

    • Replacement of existing ACSR conductor with 556 kcmil ACSS/TW (HS285) “Dove,” while the existing shield wire remained.
    • Modeled and analyzed (49) steel lattice towers.

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  • Designed fabricated replacement arm for existing wooden arms on the steel lattice towers.
  • Added reinforcement plates to the existing lattice towers at the ground line, as needed, to account for corrosion and failure of existing leg members, bolts, and concrete footings.
  • Replaced (6) existing wood structures and hardware.
  • Added (3) new wood structures and hardware.
  • Installed new conductor hardware to allow the re-use of (3) existing wood structures.

 

 

Design Challenges and Solutions:

The Client’s goal was to retain all of the existing lattice towers, despite advanced age and ground line deterioration. Realtime was able to achieve this goal by designing an innovative arm replacement, and provide insight for tower leg repairs and enforcement. Several distribution and road crossings also needed to be accommodated as part of the new design work. Realtime was able to accomplish these tasks, while obtaining clearance buffers beyond the basic NESC requirements.