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Substation Power Transformers

This contract provides up to five 138kV–24.9/13.2kV three-phase substation power transformers rated 25/33/50/56 MVA. Suppliers deliver oil-immersed delta-grounded wye units with load tap changers, dual secondary voltage switching, factory and field testing, design review support, and full assembly services.

Includes Contract MSA
Includes Renewal Documentation
Includes Board Approval Resolution
Includes Advertisement Documents
Includes an RFP
Includes Pricing Documentation

Description

This contract establishes a source for up to five oil-immersed, three-phase 138kV–24.9/13.2kV substation power transformers. It connects entities with experienced manufacturers that provide fully engineered, factory-tested transformers with load tap changers, dual secondary voltage capability, and complete field assembly services.

Key Service Categories:

  • Transformer Design And Manufacturing: 25/33/50/56 MVA delta-grounded wye units with copper windings and 7% impedance
  • Load Tap Changer Systems: ±10% regulation with 32-step OLTC located on the secondary winding
  • Dual Secondary Voltage Switching: External selector switchable between 24.9kV and 13.2kV with full 56 MVA capability
  • High Lightning And BIL Performance: 650kV BIL on 138kV windings and enhanced impulse ratings for regional lightning exposure
  • Factory Testing And Loss Verification: ANSI C57.12.90 compliant testing including loss, impulse, noise, and performance verification
  • Field Assembly And Vacuum Oil Filling: On-site offloading, assembly, oil processing, and final energization support

Benefits Aligned With Desired Outcomes:

  • Improved System Reliability: Designed for infinite bus short-circuit withstand and high through-fault conditions
  • Voltage Regulation Flexibility: On-load tap changer and dual secondary voltage support changing distribution needs
  • Long-Term Asset Performance: 60-month warranty with factory drying, vapor phase processing, and moisture control
  • Standards Compliance: Manufactured to ANSI, IEEE, NEMA, and IEC requirements with documented testing

These services support resilient substation expansion with fully engineered transformers designed for high reliability, lightning performance, and long-term operational stability.

Contract Documents

Contract

RFP

Pricing

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Suppliers on contract

WEG Transformers USA LLC

Washington, MT
Lead Entity
City of Denton
Expiration
January 14, 2030
Vendor Contact Info
Phone: 
6364328035
Address: 
Washington, MT

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