1. Technical Specification - DNFH Electrical Upgrades - Transformers - 3-26-25.docx

DWORSHAK NATIONAL FISH HATCHERY

TECHNICAL SPECIFICATION

THREE PHASE, PAD MOUNTED, OIL-FILLED TRANSFORMERS

1.0 SCOPE

This specification pertains to the purchase of three (3) new three phase, pad mounted, oil-filled transformers (one (1) each at 500 KVA, 1500 KVA, and 2500 KVA ratings) for the Dworshak National Fish Hatchery, U.S. Army Corps of Engineers, Walla Walla District, in Orofino, Idaho. Each transformer shall meet the respective salient characteristics in sections 2.0-4.0, and the general requirements in section 5.0. In addition, each transformer must be equipped standard, or by option, with the features identified in section 6.0. The successful bidder shall deliver the transformers to the Dworshak National Fish Hatchery by the date shown in the “Shipment and Delivery” section.

2.0 500 KVA TRANSFORMER (CLIN 001)

The Contractor shall supply one (1) 500 KVA, Three Phase, Pad-Mounted, Less-Flammable Oil-Filled transformer that shall meet the following requirements:

2.1. The transformer shall be rated 500 KVA self-cooled (KNAN).

2.2. Primary voltage: 24.9 KV wye. Secondary voltage: 480V wye, 4-wire, 60 Hz.

2.3. Transformer must be step down rated.

2.4. Critical physical dimensions:

a. 81” Max Width

b. 56” Max Depth

2.5. Max 57 Decibel (DB) sound level maximum

3.0 1500 KVA TRANSFORMER (CLIN 002)

The Contractor shall supply one (1) 1500 KVA, Three Phase, Pad-Mounted, Less-Flammable Oil-Filled transformer that shall meet the following requirements:

3.1. The transformer shall be rated 1500 KVA self-cooled (KNAN).

3.2. Primary voltage: 24.9 KV wye. Secondary voltage: 480V wye, 4-wire, 60 Hz.

3.3. Transformer must be step down and step up rated.

3.4. Critical physical dimensions:

a. 90” Max Width

b. 86” Max Depth

3.5. Max 60 Decibel (DB) sound level maximum

4.0 2500 KVA TRANSFORMER (CLIN 003)

The Contractor shall supply one (1) 2500 KVA, Three Phase, Pad-Mounted, Less-Flammable Oil-Filled transformer that shall meet the following requirements:

4.1. The transformer shall be rated 2500 KVA self-cooled (KNAN).

4.2. Primary voltage: 24.9 KV wye. Secondary voltage: 480V wye, 4-wire, 60 Hz.

4.3. Transformer must be step down and step up rated.

4.4. Critical physical dimensions:

a. 90” Max Width

b. 100” Max Depth

4.5. Max 62 Decibel (DB) sound level maximum

5.0 GENERAL REQUIREMENTS

Each transformer supplied under this Contract shall meet the following general requirements and characteristics:

5.1. Transformer shall be compartment-type, bottom fed, self-cooled, for mounting on a concrete pad

5.2. Equipped with two (2) 2.5% full capacity above normal (FCAN) and two (2) 2.5% full capacity below normal (FCBN) taps.

5.3. Minimum impedance at 85 C is 4.03% for units rated at 500 KVA and 5.32% for units rated at 750 KVA and above.

5.4. Basic impulse level (BIL) of the primary and secondary winding shall be as specified in IEEE C57.12.00 for comparable KV class.

5.5. High and low voltage neutrals internally tied, with a removable strap. The insulation system shall have a minimum rating of 120 C insulation class.

5.6. The transformer shall be of sealed-tank construction of sufficient strength to withstand a pressure of 7 psi without permanent distortion and have a nitrogen blanket. The cover shall be welded and the handhole fastenings tamper resistant. The transformer shall remain effectively sealed for a top oil temperature range of –5° C to 105° C. When required, cooling panels shall be provided on the back and sides of the tank. Lifting eyes and jacking provisions shall be provided.

5.7. The high voltage terminations and equipment shall be dead front and loop fed.

5.8. The average temperature rise of the windings, measured by the resistance method, shall be 65° C maximum when the transformer is operated at rated KVA output. The transformer shall be capable of being operated at rated load in a 30° C average, 40° C maximum ambient, as defined by IEEE C57.12.00 without loss of service life expectancy.

5.9. Coolant and insulating oil shall be less flammable, transformer type (greater than 300 Celsius rated) meeting ASTM D5222-23 and shall be UL listed.

5.10. All cores to be constructed of high grade, grain-oriented, non-aging silicon steel with high magnetic permeability, and low hysteresis and eddy current losses. Magnetic flux is to be kept below the saturation point.

5.11. Live front bushings shall be porcelain with blade terminals with NEMA standard hole spacing arranged for vertical take-off and supported appropriately. Bushings shall be externally clamped and front removable.

5.12. The high and low voltage Air Terminal Compartments (ATC) shall be located side by side, separated by a steel barrier. When facing the transformer, the low voltage compartments shall be on the right. ATCs shall be full height, air-filled, with individual doors. The high voltage door fastenings shall not be accessible until the low voltage door has been opened.

5.13. High voltage dead front bushings shall be rated at 200 Amps, either universal wells or one-piece integrated for use with separable connectors. Bushings shall be externally clamped and front removable.

5.14. The front of both compartments shall be removable to allow the transformer to be rolled or skidded into position over conduit stubs. ANSI tank grounding provisions shall be furnished in both compartments.

5.15. Provide a load break, gang operated, liquid immersed switch rated at 200 A. The switch shall be externally operable from the high voltage compartment through use of a distribution hot stick. Switch to be 2-position "OFF-ON" type for use on a radial feed-system.

5.16. Provide bayonet type, liquid immersed fuses in series with oil immersed current-limiting fuses. Bayonet type fuses are to be externally replaceable with a hot stick without opening the transformer tank.

5.17. Surge Protection: Provide six (6) total 25 kV distribution class, Varistar type, lightning arresters (18K MOV) for surge protection. Arresters are to be mounted in the high voltage compartment.

5.18. Standard K-1 harmonic load factor rating

5.19. Heater: None

5.20. Altitude: Standard 3300 feet maximum

5.21. Control Power Transformer: None

5.22. Exterior Color: Munsell Green #7.0GY-3.29

5.23. Transformer shall be UL listed and FM rated/approved.

6.0 ACCESSORIES AND OPTIONS

In addition to the salient characteristics in sections 2.0-5.0, the following accessories shall be equipped standard, or by option, on all transformers:

a. Nameplate in low voltage compartment

b. 1” upper filter press and filling plug

c. 1” drain valve with sampling device

d. Lightning arrester mounting provisions

e. Tap changer with silver-plated stationary and movable contacts, for de-energized operation only, which is externally operable and padlockable

f. Mounting provisions for low voltage current transformers and potential transformers

g. Dial type thermometer

h. Magnetic liquid-level gauge

i. Pressure-vacuum gauge with bleeder drain valve with sampler device

j. Sudden pressure relay

k. Automatic pressure relief device (self-sealing with indicator)

l. Tamper-proof bolts for compartment doors

m. Key interlock to primary or secondary compartment door

n. Bushing well inserts

o. Feed-thru inserts

p. Nitrogen test port

q. Rubber snubber circuit

r. Standard Labeling: Danger High Voltage Decal, Non-PCB Decal, Arc Flash Warning Decal, minimum

7.0 OPERATION AND MAINTENANCE MANUALS (O&M) (CLIN 004)

The Contractor shall assemble and delivery three (3) hard copies and one (1) electronic copy of the O&M manual. The manual shall be hardbound and titled with the Contract Name and Number. The manual shall be sectionalized by transformer with each section containing all the relevant information for the respective transformer. O&M manual shall be delivered on or before the delivery date of the transformers.

7.1. Each section shall contain the following information, at a minimum:

a. Installation instructions/guide

b. Product data sheets and/or catalog sheets

c. Shop drawings, including:

i. Outline dimensions, plan and elevation

ii. Connection and support points

iii. Weight

iv. Specified ratings and materials

d. Complete warranty information

e. Replacement parts list

f. Oil specification and product data

g. All test report data

8.0 SUBMITTALS

The Offeror shall provide with their quote sufficient product information (e.g., brochures, cut sheets, options available and offered, etc.) for the Government to determine whether the offered product meets the salient requirements. Items in the documentation not related to the offer should be crossed or blackened out. A checklist of this specification alone will not be considered a sufficient offer.

8.1. Pre-Award:

a. Installation instructions/guide

b. Current product data sheets to include the transformer and ancillary equipment

c. Submit shop drawings indicating outline dimensions, connection and support points, weight, specified ratings and materials.

8.2. Post-Award:

a. Complete O&M manual shall be submitted on or before shipment of the associated transformer.

b. All transformer performance and efficiency test reports, per section 9.1, shall be submitted for Government review and approval thirty (30) days prior to shipment of the associated transformer.

c. Insulating oil testing results, per section 9.2, shall be submitted for Government review and approval thirty (30) days prior to shipment of the associated transformer.

d. Complete warranty information

9.0 TESTING

9.1. All transformers furnished under this contract shall be tested to verify operational performance and efficiency. Testing shall be conducted in accordance with the provisions of IEEE C57.12.90. Test reports shall be prepared to meet standard report formatting requirements, submitted per section 8.2.b and included in the O&M manuals. Testing shall include the following, at a minimum:

a. Ratio

b. Polarity

c. Phase Rotation

d. No-Load Loss

e. Excitation Current

f. Impedance Voltage

g. Load Loss

h. Applied Potential

i. Induced Potential

j. QC Impulse test

k. Oil Leak Test

l. Power Factor Test

m. Resistance Measurement Test

n. Factory QC Impulse Test (HV only)

9.2. All transformer insulating oils shall be tested in accordance with the applicable IEC 60475 and/or ASTM standards. Test reports shall be prepared to meet standard report formatting requirements, submitted per section 8.2.c and included in the O&M manuals. Testing shall include the following, at a minimum:

a. Fire and flash points

b. Relative density

c. Viscosity

d. Dielectric breakdown voltage at 60Hz

e. Gassing tendency

f. Dissipation factor

g. Total acid number

h. Interfacial tension

i. Corrosive sulfur

j. Water content

k. Oxidation stability

l. PCB content

10.0 Warranty

All furnished equipment shall be covered by a minimum one-year warranty on all parts, labor, and workmanship from factory defects. All warranty work will be done without delivery or shipment fees (including travel or on-site work). All parts and components covered by a manufacturer’s warranty greater than one (1) year shall prevail.

11.0 SHIPMENT AND DELIVERY

All items shall be delivered FOB Destination to the Dworshak National Fish Hatchery within eighty (80) weeks of contract award. The Contractor shall be responsible for packing and shipping the components in a manner that will ensure undamaged and complete arrival to Dworshak National Fish Hatchery. Offload locations for equipment to be coordinated with COR. All deliveries to be coordinated a minimum of thirty (30) days in advance. Deliveries shall be made during normal Dworshak National Fish Hatchery operating hours of Monday–Thursday, 7:00 a.m. – 4:30 p.m., excluding federal holidays.

Shipment shall be to:

Dworshak National Fish Hatchery Attn: Contract Performance Specialist 276 Dworshak Complex Dr.

Orofino, ID 83544 Ph. (208) 476-1296