Substation Rebuild/Expansion

Northwest Arkansas

Substation Rebuild/Expansion

Background

In response to continued regional growth, the Electric Cooperative needed to expand and modernize a key substation originally constructed in 1962—based on an Allgeier Martin design. Though multiple additions had been made over the years, portions of the existing drawings were incomplete. The Cooperative brought AMA back to assist with a comprehensive rebuild and expansion of the low-voltage side, including the removal and replacement of station transformers, relocation of the capacitor bank, and addition of feeder positions for both current and future needs.

Additional improvements included reworking the connection from the high-voltage bay to the station transformer and moving the sectionalizing switch on the HV structure.

Substation Rebuild/Expansion

Activity

Technical Design & Features

  • Boundary and topographical surveying
  • Fence expansion of approximately 400 LF
  • Modified low-voltage structure with:
    • 3 installed feeder positions
    • 2 future feeder positions
    • Future regulator bay
  • Power feed to fiber building
  • Capacitor bank
  • Existing AMR
  • Low-voltage section with 25 kV switches and insulation levels
  • Construction and mobile transformer connection provisions
  • New 795 kcmil 26/7 ACSR from HV bay to transformer
  • Dual 1000 kcmil 61-strand MHD CU from transformer to LV structure
  • 4"x4"x3/8" aluminum angle bus conductor on LV structure
  • Single 500 kcmil 37-strand MHD CU for primary feeder positions
  • Assorted conductor sizes for interconnections
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    Some engineers looking at diagrams.