Atch01_SOW_Transformer_v2 3 Sep 26.pdf

STATEMENT OF WORK (SOW)

FOR PROCUREMENT OF

POWER TRANSFORMERS

(30 CES FY26)

23 September 2026

1.0 BACKGROUND

This contract requires the contractor to purchase eighteen (9) medium voltage pad-mounted transformers 9 for the replacement of equipment that is approaching end of life service located at Vandenberg Space Force Base (VSFB).

Justification: Vandenberg’s power grid has approximately 500 transformers connected of various sizes ranging from 25 kVA to 2,000 kVA; constituting 40 to 50 different capacity and voltage configurations with limited cross-compatibility opportunities. That means 30 CES requires 40 to 50 different transformers on hand as critical spares. Since COVID, transformer availability, cost and lead times have grown worse and worse, affecting CE’s ability to reconstitute transformer inventories following repair projects that use them. The current spare inventory lacks some of the most commonly used transformers, forcing CE Electricians to scavenge transformers from vacant buildings in the recent 4-6 years. Two purchases made in FY25 will bring only 15 new transformers in the spare inventory; falling short of CE’s actual needs. More transformers are needed to fulfill a comfortable critical level of spares for future needs on the power grid.

Additionally, the ever-increasing launch tempo and general mission tempo of Vandenberg has greatly reduced the tolerance for unexpected power outages. 30 CES desperately needs to establish this critical spare inventory to prevent mission stoppage.

2.0 DESCRIPTION OF WORK

2.1 PAD-MOUNT TRANSFORMERS

The contractor shall furnish all labor, transportation and other requirements necessary for providing the following transformers. The three phase pad-mounted transformers shall have the following voltage ratings:

# Item Qty 1 Pad-mount transformer, 12000V primary, 120/208Y secondary, 300 kVA 2 2 Pad-mount transformer, 12000V primary, 277/480 secondary, 300 kVA 2 3 Pad-mount transformer, 12000V primary, 120/240 secondary, 225 kVA 1 4 Pad-mount transformer, 12470V primary, 120/208Y secondary, 300 kVA 1 5 Pad-mount transformer, 12470V primary, 277/480 secondary, 300 kVA 1 6 Pad-mount transformer, 12470V primary, 277/480 secondary, 500 kVA 2 7 Pad-mount transformer, 12000V primary, 120/208Y secondary, 500 kVA 1 8 Pad-mount transformer, 12000V primary, 277/480 secondary, 500 kVA 1 9 Pad-mount transformer, 12000V primary, 277/480 secondary, 750 kVA 2

In addition, the three phase pad-mounted transformers shall meet VSFB electrical requirements below:

EQUIPMENT SPECIFICATION – PAD-MOUNTED TRANSFORMERS

Construction & Materials:

All stainless-steel construction including tank, cabinet enclosure, base, radiators, fasteners, hinges, hardware, and internal high-voltage/low-voltage compartment barriers.

Stainless-steel grade shall be 304L or 316L. Mild steel is not permitted for internal barriers.

Transformer tanks and lids must be corrosion-resistant, fabricated of stainless-steel conforming to ASTM A167, Type 304L or 316L.

Cabinet shall include a "Pentahead" cabinet locking mechanism/device.

Four (4) lifting lugs and proper grounding provisions on the transformer tank.

Data plate must be stainless steel, corrosion-proof with engraved data (not printed with ink). Nameplate and NEMA safety labels shall include a "UL Listed" symbol on the ratings label and nameplate.

The transformer shall be labeled with the kVA rating in 2.5-inch-tall numerals placed below the low-voltage terminals near the bottom of the tank.

Exterior Finish & Color:

Entire exterior of the pad-mount transformer and terminal components shall be painted with Munsell Green (7.5GY 3.2/6.7) outdoor color finish in full compliance with IEEE C57.12.28 enclosure integrity standards.

Electrical Specifications & Winding Configurations:

System Configuration: Designed for a 3-wire Delta primary distribution system.

Frequency: 60 Hz.

Windings: 100% copper windings for both HV and LV.

Primary Voltage & BIL: 12,000V and 12,470V primary connected in 3-wire Delta, 95 kV

BIL.

Secondary Voltage & BIL:

120/208Y: 4-wire Wye-Grounded secondary, 30 kV BIL.

277/480Y: 4-wire Wye-Grounded secondary, 30 kV BIL.

120/240V: Delta secondary with center-tapped high-leg on one phase, 30 kV BIL. High-leg conductor shall be factory-identified per NEC Article 110.15 / 230.56.

Impedance (%Z): Nominal 4.5% to 5.75% for all units in accordance with standard IEEE C57.12.34 manufacturing tolerances.

5-position off-load tap changer operated by an external handle or selector switch, equipped with four 2.5% full-capacity taps (-5%, -2.5%, 0, +2.5%, +5%).

Primary/Secondary Compartments & Feed Configuration:

Dead-Front construction (HV-200A load break elbows with shield adapters).

Externally clamped LV bushings with threaded copper studs for full load current below 2,100 amperes, provided with NEMA spades per ANSI hole requirements.

Feed Configuration: Radial feed is preferred, but loop-feed configurations are permitted subject to Government review and technical submittal approval.

Two-position "ON/OFF" load break primary switch.

Insulating Fluid & Thermal Performance:

Environmentally friendly FR3 Natural Ester fluid (biodegradable, non-PCB).

Cooling fins included.

Guaranteed to have an average coil winding temperature rise of 65°C over an average ambient air temperature of 30°C when operated at rated voltage and load conditions.

Compliant with Department of Energy (DOE) efficiency standards (10 CFR Part 431).

Protection, Accessories & Gauges:

Bay-O-Net fuses & current-limiting fuses properly sized, supplied with three (3) spare fuses per transformer.

Automatic pressure relief device mounted in the terminal compartment.

Dial-type gauges for oil temperature, liquid level, and pressure/vacuum.

Oil drain valve with sampling device, and an oil-fill/oil-level plug.

Testing & Quality Assurance:

General transformer performance and routine factory testing shall conform to the latest revisions of IEEE Std C57.12.00 and IEEE Std C57.12.90.

The manufacturer shall perform a factory Dissolved Gas Analysis (DGA) test on the insulating fluid following routine and design acceptance testing. Sampling shall be performed per ASTM D3613, laboratory analysis executed per ASTM D3612, and results evaluated per IEEE Std C57.104. Certified DGA test results shall be submitted prior to shipment.

Remanufactured or rebuilt units are strictly prohibited; all transformers must be newly manufactured.

2.2 DELIVERY LOCATION

Contractor shall deliver the purchased equipment to the address below:

30 CES/CEOFE (Attn: Thomas Bryner)

1172 Iceland Avenue

Building 11439 Electric Shop

Vandenberg Space Force Base, CA 93437

3.0. GOVERNMENT-FURNISHED PROPERTY AND SERVICES

No property or services shall be provided under this contract, except as noted below. All other items needed to fulfill the requirements of this contract are the sole responsibility of the Contractor.

3.1 Medical Response Services

The Government will provide initial medical treatment for life-threatening emergencies. It shall be the responsibility of the Contractor or Contractor employee to seek continued medical treatment, if needed. The Contractor or employee shall reimburse the Government for all Government-provided medical services. The emergency phone number is 606-3911 (LE Desk).

4.0 Main Base Access Requirements

Current security access restrictions at the Santa Maria Gate (Main Base entry gate) require all Contractor vehicles (that are the size of a standard bread delivery truck or larger) to enter only through the Lompoc Gate (located at intersection of Santa Lucia Road and Pine Canyon Road).

There is a vehicle check pull-off area at that gate, and the Contractor may be required to submit to a vehicle search prior to gaining

5.0 POINTS OF CONTACT.

5.1 Customer Representative (CR)

Volkmer Garcia

30 CES/CEOR

Cell: (805) 459-1608 Work: (805) 606-3559 Email: volkmer.garcia.1@spaceforce.mil