Attachment 2 - SOW HARB Distribution Transformers (FINAL).pdf

DEPARTMENT OF THE AIR FORCE

Homestead Air Reserve Base

Homestead, Florida

STATEMENT OF WORK (SOW)

Project Title: Procurement of four pad-mounted, exterior distribution transformers

Location: Supplies and Equipment Warehouse (B213), Homestead ARB.

Date: September 25 2025

1.0 PURPOSE

This Statement of Work defines the requirements for the purchase and delivery of four (4) pad-mounted, exterior, three-phase transformers rated as indicated in section 3.0 (technical specifications) for use in Homestead Air Reserve Base (HARB) electrical distribution system.

2.0 SCOPE OF WORK

The contractor shall provide all labor, materials, equipment, factory testing, and shipping necessary to deliver fully compliant transformers to the designated facility. Installation is excluded.

3.0 TECHNICAL SPECIFICATIONS

• Type: Pad-mounted, dead-front, oil-filled

• kVA Rating: 45 kVA

• Frequency: 60 Hz

• Phase: Three-phase

• Primary Voltage: Refer to the specifications for each transformer below.

• Secondary Voltage: Refer to the specifications for each transformer below.

• Cooling Class: ONAN (Oil Natural / Air Natural)

• Impedance: Per ANSI C57.12 standards

• Primary Taps: ±2 x 2.5%

• Enclosure: Tamper-resistant, pad-mounted enclosure, ANSI 61 Gray or Munsell Green finish

• Protection/Fusing: Bay-O-Net fuses with internal isolation (ISO) links

• Bushings: Dead-front, separable load-break bushings per IEEE Std 386

• Fluid: PCB-free mineral oil or approved biodegradable alternative

• Certification: UL-listed and labeled

• Cooling Class: ONAN (Oil Natural / Air Natural)

• Winding Materials: Copper

• Coil Materials: Copper

1) MSA Transformer (B285): 45KVA, 13.2KV – 208Y/120V 4-wire wye QTY: 1 Each

2) MSA NW Fence Lighting Transformer: 300KVA, 13.2KV – 480V Delta QTY: 1 Each

3) MSA NE Fence Lighting Transformer: 45KVA, 13.2KV – 480V Delta QTY: 1 Each

4) TACAN (B844. Next to the runway) Transformer: 75KVA, 13.2KV – 208Y/120V QTY: 1 Each

Answers to Frequently Asked Questions:

1) Is FR3 Acceptable?

Answer: In order to use FR3 – the government would need the OEM approval and documentation that the particular transformer design (and components) is compatible to

ASTM D6871 for natural ester fluids, and IEC 62770/IEEE C57 references for transformer operation with natural esters.

2) Would a dry-type alternative be acceptable?

Answer: Dry type medium voltage outdoor distribution transformers are universally accepted at all Air Force bases; however, they can only be used if they come with the proper outdoor robust enclosure and insulation. Their OEM certification must meet ANSI/IEEE/NEMA specs and UL listing certification.

4.0 STANDARDS AND COMPLIANCE

Transformers shall comply with:

• ANSI C57 series (transformer construction and performance).

• IEEE Std 386 (separable connectors).

• DOE 10 CFR Part 431 efficiency requirements.

• NEMA TR 1.

• UL 1562 for liquid-filled distribution transformers.

5.0 DELIVERABLES

The contractor shall deliver:

• Four (4) pad-mounted transformers meeting specifications.

• Manufacturer-certified routine test reports and type test data.

• As-built drawings and wiring diagrams.

• Operations and maintenance manuals.

• Warranty documentation (minimum 3-year coverage).

6.0 DELIVERY AND LEAD TIME

• Lead Time: The Contractor shall provide estimated lead time with quote and confirmed lead time within 10 days of contract award.

• Delivery: Delivery shall be FOB Destination to:

Building 213 – Supply and Equipment Warehouse Homestead Air Reserve Base 29350 Westover Street Homestead ARB, FL 33039

• The delivery schedule must be coordinated with the facility POC prior to shipment.

• The contractor is responsible for packaging, crating, and protecting the equipment during transit to prevent damage.

• Early delivery is encouraged but must be coordinated with the facility POC.

7.0 QUALITY ASSURANCE AND ACCEPTANCE

• Contractor shall perform factory testing in accordance with ANSI/IEEE standards prior to shipment.

• Upon delivery, a post-delivery inspection will be conducted by the government or the owner.

• Equipment must be free of damage, meet all specifications, and be accompanied by the required documentation before it can be accepted.

8.0 WARRANTY

• Contractor shall provide a standard commercial warranty.

9.0 PHOTOS

Name Plate - MSA NE Transformer 45KVA, 13.2VA – 480V

Name Plate – MSA NW Transformer 45KVA, 13.2KV-480V – Change to 300KVA

Name Plate – MSA Transformer 45KVA, 13.2KV-208Y_120V