DH_Unit_1_Transformers_Life_Extension_Specification_2026-093.docx

Gainesville Regional Utilities Life Extension for Unit 1 XFMRs Deerhaven Power Plant

1.0 GENERAL

Gainesville Regional Utilities (GRU) requests your company (contractor) to submit a firm proposal for the supply of goods and services, as outlined in this document for the project known as:

Project Name: Life Extension for Deerhaven Unit 1 Transformers GRU plans to extend the life of Unit 1 transformers at Deerhaven for another five years. There are three (3) transformers associated with Unit 1 (T-61, T-62 and T-65).

Observed current condition of transformers T-61 and T-62 include the following.

· The radiators are at end of life. There is significant rust and paint bubbling / cracking. Signs of oil leaks are present.

· Many of the existing radiator fans are not OSHA compliant

· The transformer components frequently provide false alarms due to the condition of the wiring between the transformer cabinet and each component.

· The CT cables are run in a channel behind the radiators. For ease of access, it is recommended that replacement occurs while the radiators are removed.

· Transformer T-62 has a significant nitrogen leak

· At a minimum, the winding temperature gauge on T-62 will need replacement

· The DETC (De-energized Tap Changer) on T-61 is damaged and should not be touched!

· Many of the cables leaving the transformer cabinets have jackets that are known to contain asbestos. These cables should not be disturbed!

Transformer T-65 has no known concerns.

At a minimum, each contract shall quote based on the scope described within this specification. The scope associated with transformers T-61 and T-62 shall include the procurement and replacement of the radiators, wiring between the transformer cabinets and transformer components, and testing of each transformer. The scope associated with transformer T-65 shall be limited to testing. Detailed technical requirements can be found in the “Scope of Work” section of this document.

Contractors are encouraged to provide alternate scopes based on the site visit along with justifications of how a proposed alternate scope will better achieve a 5-year life extension of these units.

Basic nameplate information for each transformer is below. Nameplate photos have also been included at the end of this specification.

Transformers T-61 & T-62

· Three phase transformer

· 138 kV Grd. Wye / 13.8 kV Delta

· 35/46.67 MVA @ 55C, 52.267 MVA @ 65C

Transformer T-65

· Three phase transformer

· 13.8 kV Delta / 4.16 kV Wye

· 7,500 kVA @ 55C, 8,400 kVA @ 65C This work is intended to be turnkey unless specified otherwise.

2.0 PROJECT LOCATION

Deerhaven Power Plant 10001 NW 13th Street Gainesville, FL 32653

3.0 SCHEDULE

Unit 1 outage dates are 2/27/27 to 5/3/27. Contractor actual start date will be coordinated with the GRU Representative. There will be a mandatory safety orientation that must be completed prior to the contractor start. Refer to the “Safety Requirements” section of this document for additional details. Please plan to have all work completed no later than April 23, 2027 (Friday).

GRU normal business hours are Monday through Friday 7:00 AM to 5:00 PM. Contractor may perform the work outside business hours only with prior approval from the GRU contact.

A mandatory pre-bid site visit will be part of this bid process. This site visit will be on XXXXX, 2026 at 9 am. All bidders who attend will be required to wear the below PPE (personal protective equipment) during the site visit.

· Hard hat

· Safety glasses

· Natural fiber clothing or FR clothing

· Closed toe footwear

4.0 GRU CONTACT

TBD

5.0 REFERENCED SCOPE DOCUMENTS

6.0 SCOPE OF WORK

Please provide a quote for the scope of work below specific to each transformer.

6.1 Radiator details for transformers T61 & T62

The contractor shall be responsible for the procurement and replacement of the radiators associated with transformers T61 & T62. This shall include, but not limited to the following:

· Procurement and installation of new radiators and installation materials

· Procurement and installation of new OSHA compliant fans

· Removal / disposal of existing radiators and fans The existing radiators are associated with two identical Westinghouse transformers. The overall header length of the radiators will be fixed due to bus duct that is adjacent to one of the transformers. Each vendor shall be responsible for confirming radiator dimensions and providing a final installed solution. Photos can be found at the end of this document.

Existing transformer information:

· Manufacturer: Westinghouse

· Serial Numbers: 7001632 & 7001633

· Instruction Book: LAM528-12

· Manufactured in 1970 Existing radiator information (contractor shall be responsible for verifying radiator details)

· Flange thickness – ¾ inches

· Flange height – approximately 7 inches

· Flange width – 8.5 inches

· Bolt hole center to center vertical – 5 3/8 inches

· Bolt hole center to center horizontal – 7 ¼ inches

· Bolt hole diameter – ¾ inches

· Center to center of mounting headers – 126 inches

· Overall header length – 61 1/8 inches

· Header outside diameter – 5 inches

· Plate width – 11.5 inches

· Total number of plates per radiator – 36

6.2 Component cabling replacement for transformers T-61 & T-62 The contractor shall be responsible for replacement of the wiring between the transformer cabinet and the transformer components associated with transformers T61 & T62. This shall include, but not limited to the following:

· Radiator fans

· Pressure relief device

· Sudden pressure device

· Liquid level gauge

· Temperature gauges

· Current transformers Basic wire jacket requirements and wire sizes.

· primary insulation jacket of all wiring shall be 600-volt, 90°C or higher temperature, flame retardant, and moisture, heat, and oil-resistant

· control wiring shall be #12 copper at minimum

· current transformer wiring shall be #10 copper at a minimum Contractor shall be responsible for recommissioning all of the above components. All alarm functionalities shall be verified with GRU personnel. Test all CT’s (each winding for multi-ratio). Current transformer commissioning shall be completed alongside a GRU relay technician.

6.3 Isolation of transformers T-61, T-62 & T-65

1. GRU to switch out transformers

2. Contractor to install grounds on transformers. The low side of T-61 & T-62 will be grounded by GRU. The low side of T-65 utilizes grounding balls. GRU can provide jumpers to attach to the grounding balls.

3. Contractor shall remove leads from low side and high side bushings of each transformer. Low side bushings for T-61, T-62 and T-65 are enclosed within bus duct. High side bushings for T-65 are also within a bus duct. Refer to photos at the end of this specification for additional details.

6.4 Re-gasket and testing of transformers T-61 & T-62

1. Contractor shall pre-test the transformers prior to draining oil. Provide preliminary results to GRU.

0. Winding resistance

0. Power factor and capacitance test on windings

1. Contractor shall perform the following visual inspections and include the results in a report to GRU

0. Tank ground condition

0. Paint condition

0. Oil leaks

0. Inspect control cabinet

0. Verify correct liquid level in tanks and bushings

1. Contractor to test for nitrogen leaks. Any leaks shall be identified prior to removing oil.

1. Contractor to remove transformer oil

1. Contractor to provide and replace all existing radiators

1. Contractor to provide and replace all existing fans with OSHA compliant fans

1. Contractor to provide and replace all existing component wiring.

1. Contractor to provide and replace all transformer gaskets.

Transformer gaskets to be replaced shall include gaskets associated with the following (but not limited to):

7. All bushings

7. Radiators

7. Manholes

7. Sudden pressure relay

7. Pressure relief device

7. Drain and fill valves (include rebuilding valves or replacement if needed)

1. Contractor shall take a photo of each newly installed gasket including location and date. Photos to be provided to GRU rep at the end of the project on a USB flash drive.

1. Contractor to process the transformer oil. Process the oil to a level of virgin mineral oil and pull vacuum on the transformer.

9. The main tank and radiators of each transformer have 6,500 gallons of oil.

9. Oil storage on site will be by contractor

9. Contractor shall utilize either a double walled oil tanker or oil berms for on-site oil storage.

9. Pull a vacuum on transformer for 24 hours after you reach one (1) Torr.

9. Process the oil until the oil moisture gets below 4 PPM. Oil shall also be degassed.

9. The most recent fluid analysis reports for the transformer have been included as an attachment to this specification.

1. Contractor to inform GRU of any visible oil leaks and work with GRU to develop corrective measures.

1. Contractor to refill transformer oil under vacuum. Add or remove oil as necessary to ensure proper oil level

1. Contractor to place the transformer under positive nitrogen pressure to verify there are no nitrogen leaks. GRU to witness leak test.

1. Contractor shall test transformers T-61 & T-62 per the testing requirements in Section 6.6

6.5 Testing for Transformer T-65

Contractor to test transformer T-65 per testing requirements in Section 6.6 below

6.6 Transformer Testing Requirements

1. Contractor shall clean the below items as needed. Cleaning products must be approved by GRU prior to use. Current approved products include Mean Green, Simple Green and Purple Power.

a. Tank

b. Bushings

c. Control Cabinet

d. Radiators

2. Contractor shall perform the following testing on each transformer. Do not move or adjust the DETC (De-energized Tap Changer).

a. Record necessary pre-test readings

i. Ambient temperature

ii. Winding temperature

iii. Top oil temperature

b. Perform PF and capacitance test on windings

c. Perform PF on bushings

i. C1 and C2

ii. Hot collar, if applicable

d. Perform excitation tests

e. Perform PF on insulating fluid

f. Perform winding resistance test

g. Perform TTR test

3. Contractor shall perform the following component testing on each transformer. All contact operations must be coordinated with GRU relay technician to confirm operation of alarms and lockout relays.

a. Test winding temperature gauge by slowly heating up the temperature probe.

i. Verify gauge calibration

ii. Record contact set points and temperatures that contacts change state.

b. Test top oil (liquid) temperature gauge by slowly heating up the temperature probe.

i. Verify gauge calibration

ii. Record contact set points and the temperatures that contacts change state.

c. Verify operation of liquid level alarm

d. Verify operation of pressure relief device

e. Inspect the pressurized inert gas system

i. Check for nitrogen leaks using Snoop or equivalent liquid leak detector solution.

ii. Drain sump cylinder located within nitrogen cabinet. The sump is a collection point for any moisture or oil that may accumulate within the system.

f. Verify operation of fans

g. Verify “loss of AC” alarm

h. Test sudden pressure relay (coordinate with GRU relay tech)

4. Contractor shall provide Doble test files to GRU. GRU utilizes DGA 8.3 (*.dtax). Contractor shall provide files in a compatible format. A pdf copy of the test results shall also be provided.

5. Contractor shall complete the “GRU power transformer maintenance checklist” and provide to GRU prior to project completion.

6. Contractor shall reinstall leads from low side and high side bushings of each transformer.

7. Contractor to remove grounds from transformer

8. Contractor shall review results with GRU contact prior to demobilization

9. GRU to switch in transformer Notes *Contractor must bring own lock(s) for lock out tag out with Deerhaven power plant.

**Under no circumstances shall the DETC be moved or adjusted!

7.0 LABOR PROVIDED BY GRU

· GRU will perform all required switching needed to isolate the transformers.

· A GRU representative will be onsite during the project

8.0 MATERIAL PROVIDED BY GRU

· none

9.0 SAFETY REQUIREMENTS

The Deerhaven plant will require subcontractors to go through a safety orientation prior to starting work.

A safety hard hat sticker is required for all personnel on the Deerhaven plant site. After attending the safety orientation, hopefully the same day, you’ll get a contractors hard hat sticker. The sticker is good for 2 years and at any of our three facilities including Deerhaven, JR Kelly and South Energy Center should you get work in any of the other locations.

10.0 PROPOSAL EVALUATION

GRU will evaluate proposals based on the criteria below which are listed in order of importance.

· Price

· Technical compliance with specification, including bid submittal forms

· Schedule

· Experience with similar work

· Safety record

· References

· A 5% preference will be provided to local businesses within Gainesville city limits

· A 5% preference will be provided to small and/or service disabled veteran businesses on qualifications based solicitations.

11.0 PROPOSAL REQUIREMENTS

GRU requests that the following items be included in your proposal:

· Pricing (lump sum)

· Clarifications / Exceptions (if none, state none)

· Proposed Project Schedule in CPM format, from receipt of order through project completion, including lead times for purchased equipment

· List of experience with similar projects

· List of at least three references for similar work with current contact information

· Safety EMR rating for the last three years

· T&M rates for any extra work approved by the GRU Rep.

· Any alternate scope proposals

· Proposal to be valid for a minimum of 60 days

· Any contract resulting from this RFQ shall be subject to GRU service terms and conditions. http://www.gru.com/WorkWithGRU/Procurement/PurchaseOrders.aspx Indicate your firm’s acceptance of these terms.

· Proof of Insurance.

12.0 PHOTOS

Locations of Unit 1 transformers at Deerhaven Power Plant

T-61: Nameplate

T-61

T-62: Nameplate

T-62

T-65: Nameplate

T-65

T-65

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