POWER_TRANSFORMER_PROCUREMENT.pdf

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City of Green Cove Springs

2025-07

POWER TRANSFORMER PROCUREMENT

RELEASE DATE: July 10, 2025

RESPONSE DEADLINE: August 7, 2025, 10:00 am

Please refer to the project timeline in this document for all important deadlines.

Request For Quotation #2025-07

Title: POWER TRANSFORMER PROCUREMENT

Table of Contents

1. Notice of Request for Proposals

2. Procedures

3. Scope of Work

4. Bid Security / Bond

5. Time of Completion

6. Payment and Performance Bond

7. Additional Requirements

8. Vendor Submission

9. Price Proposal

Notice of Request for Proposals

Proposers will submit sealed Electronic Responses for Bid #2025-07 - POWER TRANSFORMER

PROCUREMENT via the City e-Procurement Portal https://procurement.opengov.com/portal/greencovesprings.

All submissions are due by 10:00 am, Thursday, August 7, 2025.

Proposals shall comply with the conditions, instructions, specifications and terms as described herein. Proposals are expected to fully inform themselves of the requirements of the specifications. Failure to do so is at the

Proposer’s risk. Proposers will not secure relief on the plea of error or misunderstanding.

Propsoers agree by submitting a proposal, to the acceptance of all terms, conditions and specifications of this

RFP. Proposals are valid for a period of 60 calendar days after date of opening.

The City reserves the right to require the successful proposer to execute an agreement incorporating all documentation, and which contains standard provisions for default, bid security, attorney fees, termination, remedies, jurisdiction and other conditions deemed legally appropriate by the City. It is the desire of the City to enter into an agreement to complete this singular project.

The City reserves the right to accept or reject any or all proposals as a whole, or any part thereof, waive any or all irregularities, and award the RFP to the responsible proposal determined to represent the City’s best interests.

Any persons wishing their proposal to be considered is responsible for making certain that their proposal is received via the City e-Procurement Portal https://procurement.opengov.com/portal/greencovesprings. No oral, telegraphic, paper, facsimile, or telephonic proposals or modifications will be considered.

THE CITY OF GREEN COVE SPRINGS IS AN EQUAL OPPORTUNITY EMPLOYER

Procedures

The City of Green Cove Springs is soliciting proposals from qualified firms to Bidder (Seller) to submit quotation for furnishing one 230-23.9kV 25/33/42//47 MVA power transformer with LTC (Goods). The contract generally consists of furnishing Goods with 5-year warranty, one set of spare parts, delivery to the

Point of Destination, testing, offloading and assembling Goods, and certification that Goods are ready for energizing. for a term not to exceed NO VALUE beginning with NO VALUE.

1. Questions & Additional Information

Bidders shall submit all inquiries regarding this bid via the City e-Procurement Portal, located at https://procurement.opengov.com/portal/greencovesprings. Please note the deadline for submitting inquiries. All answers to inquiries will be posted on the City e-Procurement Portal. Bidders may also click “Follow” on this bid to receive an email notification when answers are posted. It is the responsibility of the bidder to check the website for answers to inquiries.

2. Responses

All responses must be presented in the same order as specified in this Proposal. Supporting material may be provided; however, the City’s decision will primarily be based upon a comparison of the information specifically requested. The City reserves the right to accept or reject any and/or all Proposals, and to waive any minor irregularities and technicalities. There is no obligation on the part of the City to award the contract to the lowest proposer and the City reserves the right to award the contract to the lowest responsible proposer submitting a responsible proposal with a resulting negotiated agreement that is most advantageous and in the best interest of the City. The City shall be the sole judge of the Proposal and the resulting negotiated agreement that is in its best interest and its decision shall be final.

All applicable laws and regulations of the State of Florida and ordinances and regulations of the City of Green

Cove Springs will apply to any resulting agreement.

There is no expressed or implied obligation for the City of Green Cove Springs to reimburse responding firms for any expenses incurred in preparing proposals in response to this request.

3. Inquiries and Interpretations

Responses to inquiries which directly affect an interpretation or change to this RFP will be issued in writing by addendum. All information regarding this RFP shall be placed on the e-Procurement Portal, located at https://procurement.opengov.com/portal/greencovesprings. Requests for interpretation or changes to this RFP must be received via the City e-Procurement Portal, located at https://procurement.opengov.com/portal/greencovesprings. All such addenda issued by the City prior to the last date that submittals are required to be received shall be considered part of the RFP, and the Respondent shall be required to consider and acknowledge receipt of such in its response. It is the obligation of the Respondent to make sure that it has received all addenda prior to submission of its response.

Addenda Notification: Bidders are required to register for an account via the City e-Procurement Portal hosted by OpenGov. Once the bidder has completed registration, they will receive addenda notifications to their email by clicking “Follow” on this project. Ultimately, it is the sole responsibility of each bidder to periodically check the site for any addenda at https://procurement.opengov.com/portal/greencovesprings.

https://procurement.opengov.com/portal/greencovesprings https://procurement.opengov.com/portal/greencovesprings

Only those responses to inquiries, which are made by formal written addenda, shall be binding. Oral and other interpretations or clarifications will be without legal effect and shall not be binding on the City. The Respondent must acknowledge receipt of all addenda in its response, failure to do so will deem the proposal non-respondent.

4. Selection Process

Subject to the City's right to reject bids, and if the bid is reasonably the lowest responsive and responsible, recommendation for award to bidder will be made to the City Council. A contract will only be entered into with responsible bidders, qualified by experience and financial ability to do the work and/or supply service or materials.

Scope of Work

1. POWER TRANSFORMER PROCUREMENT

SECTION 1 - INVITATION TO BID

o BID ITEM

Buyer invites Bidder (Seller) to submit quotation for furnishing one 230-23.9kV 25/33/42//47 MVA power transformer with LTC

(Goods). The contract generally consists of furnishing Goods with 5-year warranty, one set of spare parts, delivery to the Point of

Destination, testing, offloading and assembling Goods, and certification that Goods are ready for energizing.

o POINT OF DESTINATION

Goods shall be delivered to the Chapman Substation, located at the intersection of Taylons Road and Boulevard Road, Green Cove

Springs, FL 32043.

SECTION 2 – GENERAL REQUIREMENTS

• SUMMARY OF WORK

Design, manufacture, assemble, and factory test Goods in accordance with attached technical specifications. Deliver Goods F.O.B. Point of Destination, offload, assemble and test. Provide a manufacturer’s field service engineer to perform field services specified under the supervision and direction of Buyer’s construction contractor. Buyer will furnish a construction contractor under a separate contract to perform foundation and Sitework for which the Goods under this Contract are being furnished.

• ACCEPTABLE MATERIAL AND EQUIPMENT

Seller’s proposal shall be based on new equipment and materials only. No used equipment or materials are permitted. Identify any alternate item by trade name and number to enable Buyer to determine whether such alternate item is acceptable. Alternates must be approved in writing by Buyer prior to contract placement.

• TESTS AND INSPECTION

A. Goods are to be tested in accordance with latest edition or revision of ANSI, IEEE, ASCE, ASTM, NFPA, and NEMA standards.

B. Prior to testing, Seller shall notify Buyer at least one week in advance so Buyer may have personnel at Seller’s factory during testing. Seller shall furnish the results of the tests to Buyer. Inspection of material by Buyer’s representative will not relieve

Seller from responsibility for furnishing material to conform to the Specifications.

C. Factory testing activities are limited to Tuesdays, Wednesdays, or Thursdays excluding observed holidays. Testing on any other day of the week is prohibited.

• SHOP DRAWINGS AND SAMPLES SUBMITTAL PROCEDURES

A. Transmit submittals via email to Engineer with copy to Buyer. Schedule submittals to expedite furnishing the Goods and coordinate submission of related items. Send to:

i. Engineer’s Representative: Anthony Hanson (ahanson@pdengineers.com) & (shopdrawing@pdengineers.com)

ii. Buyer’s Representative: James (Andy) Yeager (jyeager@greencovesprings.com)

B. Seller shall submit Shop Drawings and Samples for Engineer’s review and approval as soon as possible after receipt of order.

C. Submit the following quantities:

mailto:ahanson@pdengineers.com mailto:jyeager@greencovesprings.com

i. Shop drawings - One electronic copy (in PDF format) including manufacturers' data, brochures, suppliers' information, testing reports, certifications, and manufacturer's installation and testing instructions

ii. Samples – Two of each item required for evaluation

D. Identify variations from Contract Specification.

E. Provide space on all drawings for Seller and Engineer review stamps.

F. Revise and resubmit items as required. Identify changes made since previous submittal. Distribute copies of reviewed submittal items to concerned parties. Instruct parties to promptly report any inability to comply with provisions.

G. Engineer will complete review in a timely manner and will return reviewed items to Seller with the following provided for each item submitted:

SUBMITTAL REVIEW BY ENGINEER

PROJECT

SUBMITTAL NO.

Review of this shop drawing/submittal by Engineer is for general conformance with the requirements specified and compatibility with the design concept of the completed project. This review does not extend to means, methods, sequences, or procedures of construction (except where specifically called for in the specified requirements) or to issues of safety incident thereto. This review shall not relieve the contractor from its responsibility for full compliance with the requirements specified and to determine and verify the information contained therein. Provide final disposition of the comments made prior to issuance for fabrication or construction.

ACTION:

No Exceptions Taken

Make Corrections Noted (no resubmittal required)

Revise and Resubmit (see comments)

None Not Required - Information Only

REVIEWED BY:

Date:

Where:

“No Exceptions Taken” indicates submittal has been reviewed and appears to be in conformance with requirements of the

Contract Documents. Proceed as shown on the submittal.

“Make Corrections Noted” indicates submittal appears to be in conformance with requirements of the Contract

Documents. Incorporate the corrections noted and proceed as shown on the submittal. No resubmittal is required.

“Revise and Resubmit” indicates submittal does not appear to be in conformance with the Contract Documents. Engineer's comments will be noted on the submittal or in a separate, cross-referenced document. Re-check, make necessary revisions and resubmit.

“None – Not Required or Information Only” indicates that the submittal is not called for by the Contract Documents and that Engineer has not reviewed the material.

• PROJECT RECORD DOCUMENTS

A. Throughout the duration of the project, maintain one set of the following documents for record purposes. Record actual revisions made to the Goods.

1. Drawings

2. Specifications

3. Changes to the Contract Documents

4. Reviewed Shop Drawings and Samples

B. Include description of actual equipment and material furnished, including the following:

1. Manufacturer's name and equipment and material model and number

2. Material and equipment substitutions or alternates utilized

C. As-built drawings

1. Prior to submitting to Engineer the claim for final invoice, transmit to Engineer via email PDF copies of final drawings, as well as electronic files in AutoCAD format (latest version or compatible).

2. Engineer requests that all final drawings be sent as soon as available (email is preferred). These are used for creating connection diagrams that are needed shortly after delivery of the units.

3. After the equipment has been placed into satisfactory operation, revise drawings to reflect field changes, if any, made to the Goods and submit to Engineer copies of revised drawings for the Operations and Maintenance Manuals.

D. Operation, Maintenance and Installation Manuals

1. Upon shipment of Goods, deliver to Buyer two printed copies and one electronic copy on USB-drive of complete

Operation, Maintenance and Installation Manuals. Manuals shall identify material, equipment, and system description and include, at minimum, the following information:

A. Directory, listing names, addresses, and telephone numbers of Engineer, Seller, subcontractors, and major component suppliers.

B. Operation, maintenance, and installation instructions. For each category, identify names, addresses, and telephone numbers of subcontractors and suppliers. Identify the following:

o Significant design criteria o List of equipment o Parts list for each component o Operating instructions o Maintenance instructions o Maintenance instructions for special finishes, including recommended cleaning methods and materials, and special precautions identifying detrimental agents o Installation instructions o Material Safety Data Sheets

C. Project documents and certificates, including the following:

o Certified drawings, manufacturer-prepared technical literature material, and equipment data/catalog cuts of all miscellaneous material o Certified factory test results o Photocopies of warranties for Goods o Duplicate copies of warranty documents which are executed and transferable from subcontractors, suppliers, and manufacturers.

• SHIPMENT

A. Before shipping Goods, give 48-hrs notice via email to Buyer and Engineer. No shipments shall be accepted or received without authorization from Buyer.

B. Seller shall be responsible for obtaining necessary permits, providing and verifying routing and, in general, making all the necessary arrangements for transporting the equipment provided to Buyer's destination.

C. Buyer will accept shipments between 8:00a.m. and 3:00p.m. local time Monday through Thursday excluding observed holidays.

D. Ship Goods only after receiving written acknowledgment by Buyer of receipt of certified test reports. Accompany each shipment with a packing list of articles included in the shipment. Mark parts for ease of field assembly.

• TRANSPORTATION, PROTECTION, AND HANDLING

A. Store and protect Goods in accordance with manufacturer’s instructions, with seals and labels intact and legible. Store sensitive

Goods in weather-tight, climate controlled enclosures.

B. Furnish equipment and personnel to handle Goods by methods to prevent soiling, disfigurement, or damage.

C. Transport and handle Goods in accordance with manufacturer’s instructions.

D. Cover Goods subject to deterioration with impervious sheet covering. Furnish ventilation to avoid condensation or potential degradation of Goods.

E. Uncrate Goods and dispose of packing material properly.

F. Assume responsibility for loss and damage including but not limited to breakage, corrosion, weather damage, and distortion until delivered to Buyer.

G. Promptly inspect shipments to assure that Goods comply with requirements, quantities are correct, and Goods are undamaged.

H. Arrange storage of Goods to permit access for inspection. Periodically inspect to assure Goods is undamaged and is maintained in acceptable conditions.

SECTION 4 – SPECIFICATION FOR 230kV POWER TRANSFORMER

• DESIGN OVERVIEW

A. Furnish oil-immersed, three-phase power transformer(s) applied as distribution substation step-down transformers with load tap changer on low voltage windings. Design equipment, accessories, and supporting structures to meet requirements of project site conditions. Transformer(s) shall be designed to operate in parallel under normal conditions.

B. General Characteristics

1. Bid Item A:

a. Number of units: One

b. Single phase ; or Three phase X

c. Voltage rating 230-23.9 kV, 60 Hertz

d. With LTC X or Without LTC

e. MVA Ratings

i. MVA (self-cooled) 25 at 55⁰C by resistance.

ii. MVA (1st stage cooling) 33 at 55⁰C by resistance.

iii. MVA (2nd stage cooling) 42 at 55⁰C by resistance.

iv. MVA (self-cooled) 47 at 65⁰C by resistance.

f. Audible Sound Level: Average A-weighted, measured in accordance with ANSI C57.12.90, not to exceed:

i. 25 MVA: 76 db

ii. 33 MVA: 78 db

iii. 42 MVA: 78 db

2. Supplemental cooling:

Fans-ONAF;

X Fans-ONAN/ONAF;

Future Fans-ONAF/FONAF;

Future Fans-ONAN/FONAF/FONAF;

Fan and Oil Pump-ONAN/ONAF/OFAF;

Future Fan and Oil Pump-ONAN/FONAF/FOFAF.

C. The hottest spot temperature rise for the 65⁰C average temperature rise ratings shall not exceed 80⁰C.

D. Design Impedance:

8.6% Based on high voltage BIL and low voltage rating at self-cooled (ONAN) rating per IEEE C57.12.10 -2010

Table 3 or latest revision. (Refer to Exhibit E for existing transformer nameplate. Dual voltage not required.)

E. All electrical characteristics and mechanical features not herein specified shall be in accordance with applicable ANSI and

NEMA standards.

F. Loss Evaluation: As stated in the Bid Form

G. Measurements with all cooling equipment in operation for appropriate ratings.

H. Winding connections:

1. High voltage winding rated 230 kV and connected Delta

2. Low voltage winding rated 23.9 kV and connected Wye

3. Tertiary winding rated N/A kV and connected N/A

I. Auxiliary supply voltages:

1. 120/240 volts 3 wire 1 phase 60 Hertz AC will be supplied for all motors and heaters.

2. 125 volts DC will be used for alarms and control circuits.

J. Overload Capabilities: In accordance with ANSI/IEEE C57.91

1. Design bushings, connectors, leads, and all auxiliary equipment for continuous full load duty and for emergency service at 1.4 times the transformer full load current at the ONAF, ONAF rating for a period of eight hours.

K. Seismic Performance

2. The transformer shall be seismically qualified per IEEE 693-2018.

a. The test report shall be in accordance with Annex A6.0 and signed and sealed by a Civil or Structural Professional

Engineer licensed in the state of Florida. The licensed PE shall meet the requirements of A.6.2.

b. Transformer shall be fitted with a seismic qualification identification plate per Annex A.7

3. Design transformer so there will be neither structural damage nor loss of function immediately after an earthquake when subject to design seismic loads occurring simultaneously with dead and normal operation loads.

• PROJECT/SITE CONDITIONS

A. Keraunic level: 70 thunderstorm days per year

B. Combined ice and wind loading district: NESC Light

C. Elevation above sea level: Less than 3,300 feet, National Geodetic Vertical Datum

D. Load Type: Distribution substation

• DESIGN DATA

A. Design Data to be specific to site and per ASCE 113:

a. Wind Design Data

i. Basic Wind Speed: 136 mph

ii. Risk Category: III

iii. Wind Exposure Category: C

iv. Topographic Factor KZT: 1.0

b. Seismic Design Data

i. Seismic Design Category: B

ii. Mapped Spectral Response Accelerations: SS = .09 & S1 = 0.048

iii. Connections to be flexible and designed in accordance with IEEE 1527

• REFERENCES

A. Comply with the Standards, Codes and Guides applicable for the project location. Documents include, but are not limited to, the latest version of all standards, codes and as well as all applicable sections and referenced standards within. Where conflicting information is presented, comply with the most stringent of the conflicting standard, code, and/or guide.

1. FM Global

a. Property Loss Prevention Data Sheets 5-4 Transformers

2. Standards

a. Institute of Electrical and Electronics Engineers (IEEE)

i. IEEE Std 1276 Guide for the Application of High-Temperature Materials in Liquid-Immersed Power

Transformers

ii. IEEE Std 1388 Standards for Electronic Reporting of Transformer Tests

iii. IEEE Std 1538 Guide for Determination of Maximum Winding Temperature Rise in Liquid-Filled Transformers

iv. IEEE Std C57.12.00 Standard General requirements for - Liquid-Immersed Distribution, Power, and Regulating

Transformers

v. IEEE Std C57.12.10 IEEE Standard Requirements for Liquid-Immersed Power Transformers

vi. IEEE Std C57.12.70 IEEE/ANSI Standard Terminal Markings and Connections for Distribution and Power transformers

vii. IEEE Std C57.12.80 IEEE Standard Terminology for Power and Distribution Transformers

viii. IEEE Std C57.12.90 IEEE Standard test Code for Liquid-Immersed Distribution, Power and Regulating

Transformers and IEEE Guide for Short Circuit Testing of Distribution and Power Transformers

ix. IEEE Std C57.13 IEEE Standard Requirements for Instrument Transformers

x. IEEE Std C57.19.00 IEEE Standard General Requirements and Test Procedures for Outdoor Power Apparatus

Bushings

xi. IEEE Std C57.19.01 IEEE Standard Performance Characteristics and Dimensions for Outdoor Apparatus

Bushings

xii. IEEE Std C57.19.100 IEEE Guide for Application of Power Apparatus Bushings

xiii. IEEE Std C57.91 IEEE Guide for Loading Mineral-Oil-Immersed Transformers

xiv. IEEE Std C57.93 IEEE Guide for Installation of Liquid-Immersed Power transformers

xv. IEEE C57.98 IEEE Guide for Impulse Tests

xvi. IEEE Std C57.100 IEEE Standard Test Procedure for Thermal Evaluation of Liquid-Immersed Distribution and

Power Transformers

xvii. IEEE Std C57.105 Guide for the Application of Transformer Connections in Three-Phase Distribution

Systems

xviii. IEEE Std C57.106 IEEE Guide for Acceptance and Maintenance of Insulating Oil in Equipment

xix. IEEE C57.109 IEEE Guide for Liquid-Immersed Transformer Through-Fault- Current Duration

xx. IEEE Std C57.111 IEEE Guide for Acceptance of Silicone Insulating Fluids and Its Maintenance in Transformers

xxi. IEEE Std C57.113 IEEE Guide for Partial Discharge Measurement in Liquid-Filled Transformers and Shunt

Reactors

xxii. IEEE C 57.119 Recommended Practice for Performing Temperature Rise Tests on Oil Immersed Power

Transformers at Loads Beyond Nameplate Ratings

xxiii. IEEE Std C57.120 IEEE Loss Evaluation Guide for Power Transformers and Reactors

xxiv. IEEE Std C57.123 IEEE Guide for Transformer Loss Measurement

xxv. IEEE Std C57.131 IEEE Standard Requirements for Load Tap Changers

xxvi. IEEE Std C57.138 IEEE Recommended Practice for Routine Impulse Test for Distribution Transformers

xxvii. IEEE C57.148 IEEE Standard for Control Cabinets for Power Transformers xxviii. IEEE C57-154 IEEE Standard for the Design, Testing, and Application of Liquid- Immersed Distribution, Power, and Regulating Transformers Using High- Temperature Insulation Systems and Operating at Elevated

Temperatures

xxix. IEEE C62.22 IEEE Guide for the Application of Metal-Oxide Surge Arresters for Alternating-Current

Systems

xxx. IEEE Std 693™, IEEE Recommended Practices for Seismic Design of Substations

b. American Society for Testing and Materials (ASTM)

i. ASTM D1933, Standard Specification for Nitrogen Gas as an Electrical Insulating Material

ii. ASTM D2225, Standard Test Methods for Silicone Fluids Used for Electrical Insulation

iii. ASTM D3487, Standard Specification for Mineral Insulating Oil Used in Electrical Apparatus

iv. ASTM D5222, Standard Specification for High Fire-Point Mineral Electrical Insulating Oils

c. National Fire Protection Association (NFPA)

i. NFPA 70 National Electric Code

ii. NFPA 780 Standard for the Installation of Lightning Protection Systems

d. American Society of Civil Engineers (ASCE)

i. ASCE 7

• REQUIRED SUBMITTALS

A. Product Data, catalogs and cut sheets

B. Shop Drawings:

I. Outline showing general arrangement, legend, plan, elevation, base details, weights, dimensions, and gallons of oil with location of center of gravity with and without oil on outline

II. Connection, alarm, control, current, voltage, and auxiliary schematic diagrams

III. Internal wiring and connection diagrams (tabular format is not acceptable)

IV. Electronic file, containing a 3D AutoCAD compatible model, suitable for opening or importing into

AutoCAD 2020 or earlier version. Suitable file types are (but not limited to): AutoCAD (.dwg, .dxf), STEP (.stp, .ste, .step), ACIS (.sat) for use in Engineer’s site layout drawings

V. Bushing current transformers:

I. Excitation and ratio correction factor curves for each secondary ratio

II. Actual current ratio and turn ratio for each tap

III. Mechanical and thermal short time (one-second) rating

VI. Nameplate data, including all current transformer taps. Resubmit nameplate drawing after factory tests with all test data completed.

VII. Physical drawings showing equipment arrangement, terminal block locations, cable entrance, and panel layout

VIII. Terminal block connections

IX. Bushing lifting accessories and ground pad outlines

X. Notes and symbols

XI. Bill of material

XII. Detailed description of procedure for vacuum filling of transformers with insulating oil

XIII. Seismic hold-down provision details.

I. Reactions (axial force, shear forces and moments for seismic and non-seismic load cases) for anchor rod attachment to foundation.

A. Quality Assurance/Control Submittals

i. Certified seismic qualification tests and analyses, in accordance with IEEE Std. 693-2018, and signed and sealed by a Civil or Structural Professional Engineer licensed in the state of Florida.

ii. Certified short circuit withstand test results on units of comparable rating and design.

B. Test Reports, Manufacturer’s instructions, and Manufacturer’s field reports

• TESTING

A. Factory tests shall include all tests as specified in applicable ANSI and NEMA standards.

B. Factory Acceptance Tests (FAT)

Std. C57.12.00-2000 and C57.12.90-1999 Tests Required

1. Resistance measurements of all windings at rated and extreme tap positions. X

2. Winding insulation resistance X

3. Core insulation resistance X

4. Ratio tests on the rated voltage connection and all tap connections X

a. Non-LTC - on the rated voltage connection and all tap connections

b. LTC – 4.a and all tap positions of the LTC at rated high voltage tap X

5. Polarity and phase relationship on the rated voltage connection X

6. Current transformers, including polarity and ratio on all taps after final complete factory wiring. X

7. Insulation power factor – Doble test equipment X

Comments: Insulation power factor tests shall be performed on all winding-to-winding insulation, winding-to-ground insulation and all bushing taps (C1 only). All measurements shall be less than or equal to 0.5% corrected to 20⁰C.

8. Frequency Response Analysis (FRA) all units (Doble or Framit approved) X

Comments: FRA shall be performed prior to impedance and load loss tests and repeated prior to undressing the unit for shipment. Paper and electronic files are to be included in the final report.

9. Auxiliary losses X

10. No-Load losses and excitation current at 100% and 110% rated voltage and frequency at the rated tap.

X

11. Impedance voltage and load losses at rated current and frequency at rated tap and at both tap extremes X

12. Zero sequence impedance test

a. First unit

b. All units

13. Temperature rise at minimum and maximum ratings. Single unit order or 1 unit in a multiple unit order.

a. All units in the order (Special case)

b. Temperature rise test to be performed prior to Dielectrics X

14. Dielectric Tests:

a. Low frequency X

b. Low frequency on auxiliaries, controls & CT circuits X

c. Lightning impulse – Full wave & chopped wave X

d. Switching impulse – phase to ground (Special units only)

e. Partial discharge X Comments:

Impulse tests - The neutral current method of fault detection will be employed. Current and Voltage waveforms will be supplied.

Partial discharge tests - Transformer(s) shall be corona tested at the full induced test voltage level. RIV (Radio

Influence Voltage) shall not exceed 200 µV at full induced voltage level, 173%. RIV shall be 75 µV or below when tested at 150% of the maximum tap operating voltage for a period of 60 minutes and the delta PD should not exceed 30 µV. The partial discharge values shall also not exceed 300 pC @ 130% and 500 pC @ 150% voltage. This test is to run in conjunction with the above RIV tests.

15. Excitation test after dielectrics

a. One-hour

b. Twelve-hour

c. Twenty-four hour

16. Sound level (Special units)

17. Short circuit capability Comment:

Transformer short-circuit strength shall meet the requirements set forth in IEEE Paper No. 71TP536-PWR, IEEE Std. 262A-1974, Short Circuit Test Code ANSI/IEEE C57.12.90A. Buyer has the right to request through-fault testing (at extra cost) at any time prior to final testing of assembled unit.

18. Operation test of all devices X Comment:

All controls and protective devices shall be functionally operated at their designed operating voltages.

C. Dissolved gas-in-oil tests will be performed prior to any testing to establish a base line and after the following tests that are applicable to this unit:

1. Temperature rise (13) – both base load and maximum load tests

2. Dielectrics (14)

3. Excitation (15)

4. Short circuit (17)

D. The above table of tests does not release Seller from performing any other tests that may be relevant and/or required by the applicable standards to ensure the quality of the design.

E. A schedule of all Factory Acceptance Tests (FAT) as well as Core and Coil Inspection shall be submitted to Buyer and

Engineer a minimum of four weeks prior to the performance of such tests. Buyer and/or Engineer reserve the right to attend any and/or all of these tests/inspections.

F. Time and date stamps as well as testing person’s name shall be clearly indicated in the reports for each test performed.

G. Buyer and Engineer shall be immediately notified of any unusual damage occurring during construction of the transformer and of all tests which do not meet specified or standard values. Notifications will be followed up in writing and include a summary of problems encountered, failed test results, and corrective action taken. All details of such damage or failed tests shall be included in the final report that is sent to Buyer and Engineer. Buyer and/or Engineer shall be permitted, at its option, to personally inspect such damages and/or test failures.

H. Buyer and Engineer shall be provided with all FAT results within 5 days of completion of all tests.

• HIGH VOLTAGE WINDING

A. Rated tap 230,000 volts connected Delta.

B. Full capacity taps (in addition to rated tap) at 2.5% steps (2 above center, 2 below center):

241,500 volts

235,750 volts

224,250 volts

218,500 volts

C. Delta-Wye connections available at terminal board: No .

D. Insulation ratings:

900 kV Class

150 kV BIL

E. The transformer shall be constructed using only power transformer class construction practices and materials. Only copper, circular windings of disk and/or helical construction are acceptable. Rectangular windings, oval windings or layered windings are not acceptable. The core shall be of circular, multistep, cruciform construction.

• LOW VOLTAGE WINDING

A. Rated volts 23.9 kV ; connections Wye.

B. Delta-Wye connections available at terminal board: (yes, no) No .

C. Insulation ratings:

25 kV Class

150 kV BIL

150 kV BIL at neutral end.

D. If dual voltage, external de-energized series-parallel switch required: N/A

E. The angular displacement between the high and low voltage winding vectors shall be 30 electrical degrees with the low voltage lagging the high voltage assuming H1, H2, H3 rotation.

F. Winding shall be of copper circular construction.

• TERTIARY WINDING - NOT REQUIRED

1. Minimum capacity for harmonic suppression shall be 35% of physical kVA of the largest winding.

2. Insulating rating: N/A kV Class N/A kV BIL.

3. Low frequency test voltage N/A kV applied, N/A kV induced.

4. Winding shall be of copper circular construction.

• CORE GROUND

The core ground shall be externally located so as to be readily accessible and easily removable for test purposes. The location shall be shown on the outline drawing.

• SUPPLEMENTARY COOLING EQUIPMENT

A. Initial facilities shall include:

provision only for future cooling one stage of cooling

X two stages of cooling

B. Control of cooling equipment whether provided initially or in the future shall be by single phase winding temperature equipment.

C. The control shall be readily accessible for adjusting the temperature at which the cooling equipment starts. Dial type indicators shall be provided on the temperature relays. The relays shall provide for four separate contacts to accomplish the following function:

1st Contact - 1st Stage Cooling 2nd Contact - Alarm 3rd Contact - Tripping

D. Fans shall be controlled by temperature gauge and transformer alarm monitor in parallel.

E. The temperature relay nameplate shall give Seller's temperature settings for each level.

F. Manual/auto selector switch for fan control relay and a Bank 1, Bank 2 first stage selector switch.

G. All of these shall be calculated on the basis of operation at 65⁰C winding temperature rise by resistance.

H. The fans shall be manufactured by Krenz.

I. The fans shall be individually connected to the power supply through a flexible rubber covered cord with weatherproof plugs and receptacles. The motors shall be totally enclosed and furnished without centrifugal switches.

• DE-ENERGIZED TAP CHANGING EQUIPMENT

The transformer high-voltage winding shall be tapped at only one location (typically the center of winding). The mechanism shall be externally operated by a single operating handle extended through the wall of tank at height convenient to transformer design and operation from ground-level. The changer shall be complete with position indicator and an operating handle with provisions for locking.

• LOAD TAP CHANGING EQUIPMENT

A. Automatic Load Tap Changer (LTC)

1. Location: Low voltage winding

2. Type: Reinhausen Type RMV-II complete with tank and motor operator. No substitution allowed.

3. Regulating range: 10-percent above to 10-percent below rated voltage in thirty-two ⅝-percent steps, with a total of 33 positions.

4. Rating: Deliver full kVA capacity for normal and emergency ratings at all LTC positions and at all combinations of

LTC and NLTC positions.

5. Tap Selector Switch and Mechanism

a. Mount in oil-filled compartment separate from main transformer tank.

b. Maintain physical isolation so it is not necessary to drain oil or break seal of main transformer tank when servicing

LTC.

c. Type: Vacuum

d. Tap Step Changes:

i. Smooth transition with no low voltage circuit interruption due to contact bounce or failure to maintain contact bypass bridging.

e. Replacement Ratings:

i. Contacts: Capable of 500,000 operations without contact replacement.

ii. Mechanical Rating: Capable of 1,000,000 operations.

f. Tank Accessories

i. Hinged maintenance door with oil-resistant gasket

ii. Drain, filter, and sampling valves

iii. Magnetic liquid level indicator with low level alarm contacts at 125 VDC

iv. Breather

v. Manhole for inspection of contacts without lowering oil level

g. Tap switch, motor drive mechanism, control devices, position indicator, and operation counter, in accordance with

ANSI C57.12.10

h. Seller shall furnish an LTC nameplate mounted on the control cabinet with the following information:

i. Manufacturer of the mechanism

ii. Model number of the mechanism

iii. Year of manufacture

iv. Maximum rated through current of the mechanism

v. Type of transition impedance: reactor or resistor

vi. Method of arc interruption (type of mechanism) - Arcing tap switch; or Tap selector with separate arcing switch; or Tap selector with separate vacuum interrupter.

vii. Type of drive mechanism: direct or energy spring

viii. Amount of oil in the mechanism compartment

i. Seller shall furnish a complete description of the LTC equipment including the referenced nameplate information indicated above.

6. Controls

a. Type: Automatic, microprocessor-based, Beckwith 2001D with DNP communications protocols.

b. Features:

i. Controls for parallel operation by the circulating current method or master/follower

ii. All controls to facilitate independent or parallel operation with an identical unit purchased under this contract, including parallel balancing module, and AC current relay

iii. Communication interfaces serial RS 232, RS 485, and copper Ethernet

iv. Wire Transformer LTC control to ensure power readings show in the forward direction.

v. Install necessary wiring, relays, etc. from transformer LTC to the LTC control to keep track of the total tap changer operations.

c. Equipment

i. Voltage reduction control switch with three positions: off; step one; step two

ii. Provisions for testing control mechanism

iii. Overcurrent relay for inhibit of LTC

iv. One copy of software for settings and communications included

v. All indication lamps shall be LED type

vi. Current transformer for line drop compensation

vii. Position indicator with upper and lower drag hands to indicate maximum travel and electrical reset button mounted in the control cabinet

viii. Limit switches and stops to prevent travel beyond extreme tap position

ix. Crank or handwheel for manual operation during maintenance

x. Position indication to LTC control and transformer monitor using potentiometer or 4-20ma analog input.

xi. Operations counter

xii. Form B dry contacts wired to local monitoring device for lower limit, upper limit, and hung-up alarms

xiii. Control circuit protective devices

xiv. Control switches for RAISE/LOWER, AUTOMATIC/ MANUAL, and LOCAL/REMOTE (Device

69). Mounted in the main control cabinet. Provisions for external mounted raise/lower/automatic/ manual switch

xv. OFF-position contact: Wired to indicating light and transformer monitor in main cabinet

xvi. Wired to provide LTC operation counts

I. Operations counts shall also be made available to the LTC controller

xvii. Indicating light showing NEUTRAL position

xviii. DNP control shall be available when the control is set to ‘Remote’ and ‘Auto’ via the selector switches.

d. Mounting: In easily accessible control cabinet

e. Wiring: Extended to main terminal cabinet and connected to terminal blocks. Wire power supply switch, light and convenience outlet, space heater, and switch to main terminal cabinet.

f. Using a three-position selector switch, provide provisions for powering controller off of the cabinet AC supply in the event the PT source is unavailable due to an outage and a test set utilizing voltage test terminals mounted to the control swing panel.

• BUSHINGS

A. High voltage bushings: 230 kV Class, 900 kV BIL.

B. Low voltage bushings: 25 kV Class, 150 kV BIL.

C. Tertiary bushings: N/A kV Class, N/A kV BIL.

D. Neutral bushing: 25 kV Class, 150 kV BIL.

E. The bushing arrangement shall be as follows:

A. The Segment 1 and Segment 3 centerline shall be located in the center of the tank cover.

B. The H1 and H3 bushings shall be properly spaced on each side of this centerline and parallel to the Segment 3 side.

C. High voltage bushings shall be equally spaced along a straight line.

D. The X1 and X3 bushings shall be properly spaced on each side of the X2 bushing and parallel to the Segment 1 side. Minimum

Spacing 30”

E. Low voltage bushings including the neutral bushing shall be equally spaced along a straight line.

F. Low voltage bushings shall be located on Segment 1

G. High voltage bushings shall be on Segment 3

F. The porcelain glaze shall be Gray (ANSI 70).

G. Stud connectors are to be provided. Connectors should be stud to 4-hole pad similar to Anderson type HDSF.

H. Bushings shall be manufactured by ABB or PCORE. No exceptions.

• BUSHING CURRENT TRANSFORMERS

A. The following multi-ratio bushing current transformers will be provided. They shall have five secondary ANSI Standard tap positions and should be provided with CT type terminal blocks with shorting bar and four shorting screws all equal to Penn-

Union Series 6006 SCS.

B. All secondary leads from CT shall be brought through conduit to terminal blocks mounted in control cabinet.

C. Location and Number Required:

Bushing Letter Designation * Total Each Bushing H1 A = 3 H2 A = 3 H3 A = 3 X1 B = 3 X2 B D E = 5 X3 B = 3 X0 C = 2

TOTAL = 22

* From bushing terminal to winding (left to right above).

LETTER FUNCTION

A Substation Protective Relaying - HV B Substation Protective Relaying - LV C Back-up Ground OC relay D Line-Drop-Compensation Circuit E Hot-Spot Winding Temperature Gauge F Substation Breaker Failure - HV

D. Ratios

A = 600/5 X 1200/5 3000/5 By Seller B = 600/5 X 1200/5 X 3000/5 By Seller C = X 600/5 1200/5 3000/5 By Seller D = 600/5 1200/5 2000/5 X By Seller E = 600/5 1200/5 2000/5 X By Seller F = 600/5 1200/5 2000/5 By Seller

E. Accuracy Classes:

A = C200 C400 X C800 By Seller B = C200 C400 X C800 By Seller C = C200 C400 X C800 By Seller D = C200 C400 C800 X By Seller E = C200 C400 C800 X By Seller F = C200 C400 C800 By Seller

F. Rating Factor – All CTs shall have a minimum rating factor of 1.5.

G. Wiring – All CT wiring shall be #10AWG with 90 degree C temperature rating.

• SURGE PROTECTION

A. Arresters shall be in accordance with the current ANSI/IEEE Standard C62.11.

B. Furnish a total of 6 surge arrester mounting brackets located adjacent to the following bushings:

3 H1, H2, H3 3 X1, X2, X3

C. Furnish a total of 6 surge arresters:

3 System High L-L Voltage 230 kV, MCOV >= 190 kV, S Class

3 System Low L-L Voltage 23.9 kV, MCOV >= 19.5 kV, S Class

System Tertiary L-L Voltage kV, MCOV > kV, Class

CLASS CODES: S = Station; I = Intermediate; D = Distribution

* Arresters shall be stacked (2 each phase), with one set shorted for 12kV operation.

D. Arresters shall be polymer type.

E. Arresters shall be manufactured by ABB, Cooper, GE or Ohio Brass. No exceptions.

• TRANSFORMER INSULATING LIQUID

A. Pure mineral oil obtained by fractional distillation, unmixed with other substances, meeting the requirements of ASTM D3487

B. Prepared and refined especially for transformer use; free of moisture, acid, alkali, PCBs, and injurious sulfur compounds

• OIL PRESERVATION

A. Oil shall be protected by: Sealed Tank

X Automatic Nitrogen System

B. A bleed tube for gas blanket dew point measurement shall be provided from the gas space to an elevation of six feet above the base of the transformer via a flexible metal-reinforced hose. It is preferred that this valve be mounted near or inside the nitrogen cabinet.

C. Suitable valves shall be provided to permit purging the gas space and testing the seal on the tank by admitting dry nitrogen under pressure.

D. Pressure relief device shall be of the mechanical automatic resealing type with alarm contacts. See Paragraph 1.16.A.9 of this

Section.

E. The system should also include the following:

X 200 cubic foot Nitrogen cylinder mounted less than 2 feet above base.

X Pressure Regulator X Cylinder Pressure Gauge (w/alarm contacts - 10% volume remaining.

X Transformer Pressure Gauge (w/alarm contacts - High & Low).

Other

F. The normal transformer tank pressure is to be between plus (+) 1/2 and plus (+) 8 psig.

G. The system gauges, valves, regulators, etc., shall be contained within a separate steel housing with single handled, lockable access door with sight glass.

• TANK DESIGN

A. Tank shall have welded steel plate construction with welded cover and lifting lugs. Top and bottom shall be minimum 3/8" steel. All welds shall be ground to a smooth finish.

B. Lifting lugs shall be provided for lifting complete transformers. Pulling eyes shall also be provided.

C. Jack bosses with at least 13” clearance to bottoms of base shall be provided.

D. The base shall be of the welded steel shape (i.e. "I" beam, channel, etc.), built to provide a rigid support and designed to permit the completely assembled and filled transformer to be skidded, rolled, etc. along either axis.

E. Manhole covers shall be bolted.

F. The center of gravity of the assembled transformer shall be as near to the tank centerlines as practical.

G. The exterior tank finish shall be minimum three mil ANSI #70 Gray.

H. The interior tank finish shall be painted white.

I. Transformer shall be constructed for rail shipment.

J. Transformer shall have skid-proof top.

K. Transformer shall be equipped with OHSA approved fall protection system for workers on the top of the transformer (prefer tether pole system).

L. All tank corners must be folded. Welds shall not be in the corners.

M. All conduit and boxes must be painted the same as the tank.

• TANK ACCESSORIES

A. The following accessories are to be provided with the transformer:

A. A NEMA 3R or 4 control cabinet with a hinged door complete with single padlocking handle, hinged front panel and removable bottom plate.

B. Magnet oil gauge (Qualitrol type 032 or Messko equivalent) with double low-level contacts for the main tank and LTC tank, located so to be easily visible from the ground. The first set of contacts shall be for alarm and the second set for tripping.

C. Dial-type thermometers (Qualitrol type 104 or Messko equivalent) with maximum reading pointer, one for top oil temperature and one for hot-spot temperature, with closed oil well, located no higher than 6'-6" above transformer base with contacts as follows:

1. Oil temperature thermometer with three alarm contacts.

2. Hot-spot winding temperature thermometer with four separate contacts.

• 2 for cooling fan control

• 1 for alarm

• 1 for tripping

1. Provide RTD input of all three LV phases to SEL-2414

A. Items 2 and 3 of this “Paragraph A” shall be located under drip shields welded to the tank wall to prevent moisture collection inside face plate.

B. Sudden pressure relay (Qualitrol type 900) with auxiliary seal-in relay (Qualitrol type 909 – Device 63X) only as recommended by Seller for use with this sudden pressure switch. Both 63X contacts shall be brought out to terminal blocks located in the control cabinet.

C. Lower filter press connection with 2" valve and Ohio Brass Co. No. 5700, or equal, disc sampling device main tank and tap changing compartment. Valve to be arranged so that sample can be taken only with valve open.

D. Drain valve for main tank (and load tap changing compartment, if required).

E. Copper-faced or stainless-steel ground pads with two 1/2" tapped holes on 1 3/4" centers (NEMA Standard), welded to tank for attaching ground connectors on the HV and LV sides as well as the tank top.

(Total required = 20 : 6 Low voltage side 6 High voltage side 8 Tank top)

D. Diagram nameplate located no higher than 6' above transformer base.

E. Pressure relief device with alarm contacts and semaphore. Both "Normally Open" and "Normally Closed" contact leads shall be brought down to the terminal blocks in the control cabinet. (Qualitrol type LPRD or Messko equivalent)

F. Upper filter press connection with 2" valve main tank (and load tap changing compartment, if required).

G. All relay and alarm contacts including spares shall be wired to terminal block in control housing. Terminal blocks are to be rated for 600 volts.

H. Control cabinet 120 volts AC convenience outlet, incandescent light and heater protected by a circuit breaker.

B. Bolts, cap screws, nuts, unpainted metal, etc., that is exposed to weather shall be made of non-corrosive metal.

C. Radiators shall be bolted and equipped with drain plugs. Cut-off valves shall be at both top and bottom of tank, near flange connection.

D. Radiators shall be on Segment 3 only.

• CONTROL AND MONITORING EQUIPMENT

A. Wiring shall terminate on terminal blocks suitable for #9 conductor.

B. Current transformers conductors shall terminate on Penn-Union series 6006 SCS terminal blocks or equal. Other wiring shall terminate on Penn-Union series 6000 - wide slotted blocks or equal.

C. Wiring shall be labeled at termination with designation of opposite end termination.

D. Devices requiring external connections to transformer shall be factory wired to terminal strips located in control cabinet.

E. Enclosure containing terminal blocks, alarm contacts, etc., shall be in a weatherproof and dust-tight-NEMA 3R or 4.

F. Control Enclosure for interconnection points shall be located on Segment 4

G. Conduit shall be galvanized rigid steel or galvanized intermediate metal. (IMC with 0.083 inch wall thickness). Conduit shall be supported with conduit clamps as required.

H. There shall be no splices in control wiring, including butt splices. Control cables shall be long enough to reach from the control apparatus to the control cabinet or intermediate wiring cabinets with terminal blocks may be required.

I. Transformer Alarm Monitor

A. See Exhibit B for communication equipment to be provided by Seller.

B. See Exhibit C (Transformer Monitor Input map) for I/O usage

C. Manufacturer: Schweitzer Engineering Laboratories (SEL)

D. Features:

1. Three Phase Winding Temp Monitors

a. RTD

2. Three stage fan controls

3. Temperature monitoring of oil in main tank

a. RTD

E. Provide sensors to accomplish monitoring

1. Sensors: Install according to Seller’s recommendations

F. Provide interconnection of IED according to transformer information system, as shown in Exhibit D.

G. Seller shall program monitors prior to delivery to Buyer.

1. All analog inputs and RTDs shall be properly scaled.

2. Display points shall include alarm statuses, temperature information, and LTC position.

3. Front panel LEDs shall be used for alarm targeting.

• NAMEPLATE DATA

A. The nameplate for power transformer shall conform to C57.12.00-2010 (or latest edition) standards and contain the following information (at a minimum):

A. Name of Manufacturer

B. MVA ratings and Classes at Temperature Rise

C. Voltages and Associated BIL levels

D. Schematic Connection of Windings including CTs, LTC, DETC, etc.

E. Phasor Diagram

F. Impedances at Base MVA and Voltage

G. Load and No-Load Losses

H. All possible tap positions with…