2-Carter Substation Transformer Specification.pdf

Specification

Power Transformers 138kV-13.2kV

“Carter Substation”

Lehi City Power Lehi, UT

November 13, 2025

November 13, 2025: Lehi City

Carter 138kV-13.2kV Transformer Specification Page 2 of 29

TABLE OF CONTENTS

Part Page

PART 1 - TERMS AND CONDITIONS

PART 2 - GENERAL DESCRIPTION

2.1 SCOPE

2.2 COMMUNICATIONS

2.3 REFERENCE SPECIFICATIONS, CODES AND STANDARDS

2.4 PROJECT DESCRIPTION AND SITE CONDITIONS

2.5 MANUFACTURER SUBMITTALS

PART 3 - TECHNICAL REQUIREMENTS

3.1 GENERAL

3.2 TRANSFORMER DESIGN RATINGS

3.3 CORE AND WINDINGS

3.4 TANK

3.5 RADIATORS AND COOLING SYSTEM

3.6 BUSHINGS

3.7 CURRENT TRANSFORMERS

3.8 SURGE ARRESTERS

3.9 CONTROL CABINET

3.10 GROUNDING PROVISIONS

3.11 GASKETS

3.12 FINISH

3.13 WIRING

3.14 NAMEPLATE

3.15 INSULATING OIL

3.16 ACCESSORIES

3.17 LOAD TAP CHANGER (LTC)

PART 4 - TESTING, FIELD SERVICES AND QUALITY CONTROL

4.1 REQUIRED FACTORY TESTING

4.2 FIELD SERVICES

4.3 ACCEPTANCE TESTING AFTER INSTALLATION

PART 5 - PROPOSAL

5.1 GENERAL

5.2 PROPOSAL DATA

5.3 LOSS SUBMITTALS

5.4 EXPECTED ELECTRICAL DATA

5.5 MECHANICAL DATA

5.6 ADDITIONAL INFORMATION

5.7 AUTHORIZED SIGNATURE

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PART 1 - TERMS AND CONDITIONS

Please reference the attached document titled “Terms and Conditions of Purchase Order” for the terms and conditions required by the City of Lehi associated with this specification.

The desired transformer delivery date is May 2029.

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PART 2 - GENERAL DESCRIPTION

2.1 SCOPE

A. This specification covers the technical and reporting requirements for the design, fabrication, inspection, testing, delivery, dressing, and filling of Two (2) three phase power transformers that will be owned by Lehi City Power and installed at its Carter Substation 138-12.47kV (Transformers to be 13.2kV Nominal low voltage) Substation located in Lehi, Utah at 4,600 feet above sea level.

B. These transformers are expected to be installed in May 2029

2.2 COMMUNICATIONS

A. Invoices shall be directed to “Buyer”:

Attn: Joel Eves 560 West Glen Carter Dr.

Lehi, UT 84043

Phone: (385) 201-2623 Fax: (385) 201-1623

B. Quotations, Exceptions, Submittals and Technical correspondence shall be directed to “Trev Smith”:

Attn: Brent Thomas 560 West Glen Carter Dr.

Lehi, UT 84043

Phone: (385) 201-2625 Email: brthomas@lehi-ut.gov

2.3 REFERENCE SPECIFICATIONS, CODES AND STANDARDS

Without limiting the generality of other requirements of these specifications, all work specified herein shall conform to or exceed the applicable requirements of the most recent edition of the referenced standards; provided, that wherever the provisions of said publications are in conflict with the requirements specified herein, the more stringent shall apply.

Carter 138kV-13.2kV Transformer Specification Page 5 of 29

A. ANSI NATIONAL STANDARDS INSTITUTE (ANSI) - Latest Edition

ANSI/IEEE C57.12.00 General Requirements for Liquid Immersed

Distribution, Power, and Regulating Transformers ANSI/IEEE C57.12.10 Requirements for Transformers 230000 Volts and

Below 833/958 Through 8333/10417 kVA, Single Phase, and 750/862 Through 60000/80000/100000 kVA, Three-Phase (Includes Supplement ANSI C57.12.10a-1978)

ANSI/IEEE C57.12.30 Require Aments for Load-Tap-Changing Transformers 230 kV Volts and Below, 3.75/4.687 through 60/80/100 MVA Three-Phase

ANSI/IEEE C57.12.70 Terminal Markings and Connections for Distribution and Power Transformers

ANSI/IEEE C57.12.80 Terminology for Power and Distribution Transformers

ANSI/IEEE C57.12.90 Test Code forA Liquid-Immersed Distribution, Power and Regulating Transformers and Guide for Short- Circuit Testing of Distribution and Power Transformers

ANSI/IEEE C57.13 Requirements for Instrument Transformers ANSI/IEEE C57.92 Guide for Loading Mineral-Oil-Immersed Power

Transformers Up to and Including 100 MVA with 55°C or 65°C Winding Rise

ANSI/ASTM D3487 Specification for Mineral Insulating Oil used in Electrical Apparatus

ANSI/IEEE C57.19.00 General Requirements and Test Procedure for Outdoor Power Apparatus Bushings

ANSI/IEEE C57.19.01 Standard Performance Characteristics and Dimensions for Outdoor Apparatus Bushing.

ANSI Y32.2 / IEEE 315 /

CSA Z99

Graphic Symbols for Electrical and Electronic Diagrams.

ANSI Z55.1 Gray Finishes for Industrial Apparatus and Equipment.

B. NATIONAL ELECTRICAL MANUFACTURERS ASSOCIATION (NEMA) -Latest Edition

NEMA TR-1 Transformers, Regulators and Reactors NEMA TR-98 Guide for Loading Power Transformers with 60°C

Average Winding Rise NEMA 250 Enclosures for Electrical Equipment (1000 V

Maximum)

Carter 138kV-13.2kV Transformer Specification Page 6 of 29

NEMA CC1 Electric Power Connections for Substation NEMA ICS 2 Standards for Industrial Control Devices, Controllers, and Assemblies

C. NATIONAL FIRE PROTECTION ASSOCIATION (NFPA) - Latest Edition

NFPA 70 National Electric Code (NEC)

D. ASTM INTERNATIONAL (ASTM) – Latest Edition

ASTM D877 Dielectric Breakdown Voltage of Insulating Liquids Using Disk Electrodes.

ASTM D923 Sampling Electrical Insulating Liquids.

ASTM D1816 Dielectric Breakdown Voltage of Insulating Oils of

Petroleum Origin Using VDE Electrodes.

ASTM D3487 Mineral Insulating Oil Used in Electrical Apparatus.

2.4 PROJECT DESCRIPTION AND SITE CONDITIONS

A. The transformers will be installed outdoors and rated for continuous duty. The transformer shall be able to withstand the following climatic conditions without loss or reduction in electrical performance required in this Specification:

1. Elevation: 4,600 feet above sea level

2. Maximum Ambient Temperature: 42°C

Maximum Average Temperature of Air in a 24 Hour Period: 24°C

3. Minimum Ambient Temperature: -34°C

4. Seismic Rating: Zone 2A

5. Duty: Continuous

2.5 MANUFACTURER SUBMITTALS

A. DRAWING & DOCUMENT REQUIREMENTS

1. Drawings submitted by the Seller for review and final issue shall meet the following requirements:

a. Wiring diagrams shall be of the point-to-point type. Terminal point tabulations are not acceptable.

b. Electronic copies of the drawings shall be compatible with the latest version of AutoCAD, “dwg” type files. If drawings include any XREF’s or reference external files, those files shall be included in any drawing submittal.

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2. All drawings, instruction manuals and submittals shall be in English language.

3. Symbols and drawings shall conform to ANSI Y32.2 / IEEE 315 / CSA Z99.

B. BID SUBMITTALS

1. Questions shall be submitted by 5:00 PM MST on December 4, 2025.

2. Bid submittals shall include the filled out proposal document included in

Section 5 of this Specification as well as;

3. Preliminary outline drawing;

4. Any other drawings or auxiliary information which the Seller feels will be necessary or appropriate for bidding purposes.

5. Any exceptions or terms which the Seller cannot or will not be able to meet as required by this Specification.

6. Bid submittals shall be submitted electronically via email to the Engineer and are due no later than 5:00 PM MST: December 11, 2025.

C. REVIEW SUBMITTALS

1. One (1) reproducible set of drawings shall be sent for approval by the

Engineer. Drawings include the following:

a. Transformer nameplate drawing with schematic and phasor diagram, electrical ratings, weights and winding tap data in tabular format per ANSI standards.

b. Transformer outline drawing showing plan and elevations with listing and description of all devices and accessories and details showing lifting and anchoring provisions.

c. Seller may propose to substitute equal equipment based on pricing and delivery, and is required to submit complete material lists for review and approval. Seller shall be responsible for providing component parts that are fully compatible with the Engineer’s design as indicated on the drawings. The Engineer’s review of the Sellers’ Bill-of-Material is for quality assurance purposes and to ensure conformity with the contract documents only.

d. Transformer base, general arrangement, assembly, installation and foundation arrangement drawings.

e. HV Bushing outline drawing.

f. LV Bushing outline drawing.

g. Schematic and wiring diagrams showing tap arrangements of wiring of accessories.

h. Wiring and connection diagrams for all control, current, potential and alarm circuits.

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i. Bushing current transformer connection tables (for multi-ratio CT’s), excitation curves with lead and turn resistance data, and ratio correction curves with ANSI relay or meter accuracy classes.

2. Drawings for review shall be in electronic format and shall be submitted via email or file server access for download by the Engineer.

3. Documents for review and approval by the Engineer shall be submitted within the number of weeks the Seller specified in the bid submittal documents.

D. FINAL SUBMITTALS

1. One (1) reproducible set of the final drawings in electronic format shall be submitted via email or file server access for download by the Engineer.

2. One (1) reproducible set of installation, operating and maintenance instruction manuals and test reports in electronic format that is properly indexed to identify each major piece of equipment shall be submitted via email or file server access for download by the Engineer.

3. Three (3) hard bound copies of the installation, operating and maintenance instruction manuals which cover all of the equipment furnished. Each copy shall also include final test reports, equipment drawings, CT excitation curves, and renewal parts lists for all replaceable parts and assemblies.

a. Each copy shall also include the bill of materials with manufacturer, model/type, description, and catalog number for standard components and accessories. This list shall include bushings, relays, indicators, control equipment, cooling equipment, and all other significant items.

b. Manuals shall be bound by a durable means, properly indexed to identify contents and clearly labeled to indicate Buyer, project and equipment covered.

4. Three (3) copies of the certified test reports and test reports of routine shop tests conducted in accordance with ANSI C57.12.00 prior to shipment.

5. Copies of such other information as the Buyer may request.

E. FIELD SERVICES SUBMITTAL

1. Three (3) copies of Field Service Engineer report which shall include those items listed in the Testing and Quality Control section, including results of oil sample testing.

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PART 3 - TECHNICAL REQUIREMENTS

3.1 GENERAL

A. The Transformers shall be manufactured and assembled in the United States of America

B. The transformers will be a 2-winding transformer and be connected to a 3-phase, 60 Hz system, with the following voltage and connection requirements:

Primary Winding Voltage 138kV Primary Winding Connection Delta Secondary Winding Voltage 13.2kV Secondary Winding Connection Grounded Wye Secondary Winding Grounding Resistor Size Solid

C. The design and manufacture of the transformer shall utilize new material, modern technology and quality workmanship.

D. The transformers shall have warranty period of 5 years after final acceptance.

E. Internal surge arresters or non-linear resistors shall not be included as part of the internal insulation system.

3.2 TRANSFORMER DESIGN RATINGS

A. Power ratings at an elevation of 4,600 feet above sea level:

Cooling Class ONAN/ONAF/ONAF Temp Rise over 40˚C 55˚C Continuous 55˚C ONAN/ONAF/ONAF Rating 22/26.67/33.33 MVA Continuous 65˚C ONAN/ONAF/ONAF Rating 22.4/29.87/37.33 MVA

B. Primary winding ratings:

Nominal Primary Line Voltage 138kV Maximum Primary Line Voltage 145kV Primary Winding Connection Delta Primary Winding BIL 650kV Primary Winding Conductor Material Copper

C. Primary winding de-energized tap changer ratings:

1. Five position, 2 above and 2 below nominal in 2.5 % steps.

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2. The tap changer operating handle shall be pad-lockable and brought outside the tank and located within 6 feet from the base of the transformer and shall include a position indicator with the highest voltage tap designated as “A”.

3. Nameplate for de-energized tap changer shall read “FOR DE-ENERGIZED OPERATION” rather than “NO-LOAD”.

D. Secondary winding ratings:

Nominal Secondary Line Voltage 13.2kV Secondary Winding Connection Solidly Grounded Wye Secondary Winding BIL 110kV Secondary Winding Conductor Material Copper

E. The angular displacement of the transformer shall be 30° with the low voltage side lagging the high voltage side.

F. Transformer impedance rating:

1. The impedance shall be an ANSI standard impedance for this type and class of transformer.

2. The Seller shall state the guaranteed impedance in their proposal and provide final impedance in test reports and submittals.

G. The Transformer control voltages shall be as follows:

1. AC 120/240 VAC, single phase, 60 Hz

2. DC 125 VDC

H. The transformer losses will be evaluated based on a 30 year transformer life.

The following costs will be used to evaluate the losses by multiplying them by the guaranteed no-load and load losses stated in the proposal and adding the results to the quoted price of the transformer.

1. No-load core loss: $2,943/kW @ rated voltage

2. Full-load winding loss: $1,329/kW @ 21 MVA

3. Auxiliary loss: $137/kW @ 21 MVA

I. The loss determination test system accuracy must be verified for conformance with the requirements of C57.12.00-1993, Section 9.4. The Seller’s bid shall include documentation which verifies the accuracy of the loss measurement system in accordance with the method of NIST Technical Note 1204, or in accordance with the method of Dr. Eddie So of the National Research Council of Canada. The documentation provided with the bid shall include sufficient identification of the test system to enable the Buyer to confirm that it is the same used to test the transformer.

J. The dollar values given above shall also be used to determine cost penalty to the Seller if actual transformer no-load, load and auxiliary losses shown in the

Carter 138kV-13.2kV Transformer Specification Page 11 of 29 certified shop test reports exceed the Seller’s guaranteed losses. No credit will be allowed if actual no-load, load and auxiliary losses are less than quote losses.

K. Reported losses shall use a reference temperature of 20°C for no load losses and 75°C for full load losses.

L. Maximum sound level of the transformer shall not exceed -3dB (D) below NEMA

TR1.

3.3 CORE AND WINDINGS

A. The transformer shall incorporate a cylindrical core and cylindrical windings. The windings shall be designed to meet the ANSI C57.12.90 short circuit withstand test for all possible combinations of the voltages specified.

B. Transformer core shall be of the highest quality, non-aging, cold-rolled, grain-oriented, stress-free, thin-silicone-steel or amorphous metal laminations having high permeability and low hysteresis loss. The steel shall be properly annealed and have smooth surfaces at the edges. Each sheet shall have an insulated surface which is impervious to hot transformer oil

C. The core shall be rigidly clamped and blocked to prevent damaging vibrations, interference with oil circulation, short circuits, objectionable noise levels, and shipment distortions. Any internal blocking or bracing used with is to be removed from the transformer at its destination shall be painted a bright color, such as red or yellow, clear external marking indicating their presence shall be provided (If included it shall be Manufacturer’s responsibility to remove such blocking).

D. A means shall be provided for properly handling the core assembly when it is untanked.

E. The transformer winding hot spot temperature shall be measured. The measured temperature shall be used to control the transformer cooling fans and to initiate alarm and trip signals for high winding temperature conditions. The method for measurement shall be by the current transformer simulation method.

F. The transformer shall be furnished with a de-energized tap changer on the high voltage winding.

G. The internal high voltage leads of the transformer shall be installed rigidly and spaced to provide dielectric and mechanical strength and ensure absolute phase isolation.

H. All coils shall have each turn supported at frequent intervals by means of insulating spacers which shall be permanently secured in place so arranged as to assure positive and effective oil circulation. To assure that the coil stacks remain permanently tight, all insulation spacers shall be dried and compressed at high pressure before placement in the coil stacks.

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I. Bolted connections will be acceptable only to form lead to bushing connection.

All other connections shall be welded, brazed or made with compression connectors.

J. If the coils are impregnated, the insulating compound used shall be nonhygroscopic, insoluble in, and not acted upon by, the transformer oil at overload temperatures. All varnish and other insulating materials used shall be unaffected by ordinary petroleum distillates having flash points above 170°C.

K. Each core, main series, etc. shall be single-point grounded and shall be brought through the top of the tank through an insulated bushing for an external grounding connection. The bushing shall have a removable ground strap or lead for meggering the core without opening the transformer tank.

3.4 TANK

A. The tank shall be of welded construction, with round corners with lifting lugs near the top of the tank and jacking provisions near the base. The transformer shall be capable of being lifted with either the lifting lugs or jacking plates without damage to the tank. The transformer shall be constructed so as to allow rolling or skidding on either main base axis.

B. The tank, attached compartments and piping which is subject to operating pressures shall be designed to withstand without permanent deformation, pressure 25 percent greater than the maximum operating pressures resulting from the system of liquid preservation as well as the vacuum filling and vacuum drying of the tank in the field.

C. The tank shall be properly prepared, cleaned of all rust and scale before finish is applied.

D. The tank cover shall be welded to the top of the tank. The top of the tank shall be prepared with a non-skid surface and equipped with lifting eyes sized to lift the cover only.

E. A device suitable for mounting a safety device in the approximate center of the tank cover and capable of supporting hardware including harnesses utilizing gravity brakes shall be provided.

F. The tank cover shall be provided with at least two manholes. Manholes shall be located and sized to permit access to all bushing connections and current transformers. The manholes shall be bolted and gasketed to provide a leak free tank.

G. The transformer tank shall be provided with an oil preservation system incorporating a nitrogen inert-gas pressure system complete with the following minimum accessories:

1. Nitrogen cylinder complete with high pressure gauge and shut off valve.

2. Pressure regulator.

3. Form C alarm contacts to alarm on low tank pressure, high tank pressure and low cylinder pressure.

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4. Necessary ancillary equipment including by-pass valves, oil sump, terminal boards, etc. to make a complete installation. N2 gas regulation system must also include a Schrader type valve for nitrogen filling. All gas tubing joints shall be sealed with Teflon tape to facilitate disconnect and connecting equipment.

5. Weather-proof enclosure to house equipment on side of transformer tank. The door of the cabinet shall have a window suitably placed and large enough to view all gauges without opening the cabinet. Cover of cabinet shall be hinged with hand-operated latch and provision form padlocking closed.

6. Transformer shall ship with one bottle of N2 gas.

H. The transformer tank shall be provided with the following valves and fittings:

1. One drain/filter valve located to allow complete draining of the tank.

Attached to this valve shall be a sample valve not less than 1/4 inch in diameter

2. One filling valve located near the top of the tank

3. One vacuum valve located above the oil level at the top of the tank; the valve shall be so designed and installed to prevent oil from entering into the valve during oil processing.

4. Provision for connection of portable gas detection and sampling equipment. Shall be easily accessible to allow for maintenance activities to be performed without exposing live energized parts.

3.5 RADIATORS AND COOLING SYSTEM

A. The transformer shall be furnished with removable radiators which shall be rigidly supported from the transformer tank by bolted flange connections. The radiators shall be galvanized and shall be designed to withstand the same pressures and vacuum as the main tank. The radiators shall be provided with lifting eyes.

B. Each radiator shall include lockable shut off valves and a drain plug. The design shall allow for the removal of an individual radiator from the tank by closing the shut off valve, draining the individual radiator and removing the radiator for repair without draining the transformer.

C. All radiators shall be interchangeable.

D. Cooling equipment shall be furnished as required to provide the transformer’s rated capacity without exceeding the guaranteed temperature rise.

E. Forced cooling capacity shall be provided by the use of fans for forced air cooling. Temperature control shall be provided by winding temperature equipment, including a temperature indicator and relay contacts to automatically actuate forced cooling equipment in proportion to the transformer load.

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F. Cooling equipment motors shall be rated for service on a 120/240 volt, 60 Hz, single-phase, power supply.

G. Manual control switches shall be provided in the control cabinet to allow testing and maintenance of the cooling fans and to enable selection of which group of fans is used for the first forced cooled stage. Transformer cooling equipment shall be designed for continuous ONAN/ONAF/ONAF operation.

H. All fans shall have galvanized fan guards and be provided with one piece fan blades.

3.6 BUSHINGS

A. Bushings shall have the continuous current carrying capacity necessary to carry the maximum current ratings of the transformer for all combinations of the voltages specified. Bushings shall have ANSI 70 grey glazed porcelain insulated housings. Bushing electrical characteristics and tests shall be in accordance with ANSI C57.12.00 and IEEE 21. Bushing dimensions shall be in accordance with IEEE 24 and NEMA TR1. Bushing terminals shall be in accordance with applicable parts of ANSI C57.12 family of standards.

B. High voltage bushings shall have provisions for power factor testing.

C. Bushings and terminals must be suitable for service conditions provided herein.

D. The transformer bushings shall be rated as follows:

1. The primary H1, H2, H3, bushings shall be rated at altitude:

Bushing Voltage Rating 138kV Bushing BIL Rating 650kV

2. The secondary X1, X2 and X3 bushings shall be rated at altitude:

Bushing Voltage Rating 13.2kV Bushing BIL Rating 110kV

3. The neutral X0 bushing shall be rated at altitude:

Bushing Voltage Rating 13.2kV Bushing BIL Rating 110kV

E. H1, H2 and H3 bushings shall be mounted on the transformer cover.

F. X1, X2, X3 and X0 bushings shall be mounted on the transformer cover.

G. All bushings shall be provided with 4-hole tin-plated NEMA terminals. Provide one terminal stud to NEMA 4-hole pad on each bushing (total of 7).

H. Oil filled bushings shall have a clear visual indication of the internal oil level.

I. All bushings shall be feed-through type

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3.7 CURRENT TRANSFORMERS

A. Bushing current transformers shall be furnished with standard ratio taps in accordance with ANSI Standards.

B. All current transformers shall have fully distributed windings and a minimum thermal rating factor of 2.0 at 30°C ambient.

C. Current transformers shall be installed on the HV and LV bushings inside the transformer tank as follows:

H1, H2, H3 Bushings

Nine (9) relaying accuracy grade (three (3) per bushing):

Inside CT: 1200:5, 5 lead multi-ratio, ANSI C800

Middle CT: 600:5, 5 lead multi-ratio, ANSI C400

Outside CT: 600:5, 5 lead-multi-ratio, ANSI C400

L1, L2, L3 Bushings

Six (6) relaying accuracy grade (two (2) per bushing):

Inside CT: 2000:5, 5 lead multi-ratio, ANSI C400

Outside CT: 2000:5, 5 lead-multi-ratio, ANSI C400

X0 Bushing One (1) relaying accuracy grade

2000:5, 5 lead multi-ratio, ANSI C400

3.8 SURGE ARRESTERS

A. Metal-oxide station class, mounted on standoff brackets, polymer color ANSI 70 gray. The arrester standoff brackets shall be designed so that the arrester terminal height is within 2 inches of the bushing terminal height. The arresters shall be provided with 4-hole tin-plated NEMA terminals. Arrester ratings shall be as follows:

High Voltage Duty Cycle: 120kV

MCOV: 98kV Ohio Brass

Low Voltage Duty Cycle: 10kV

MCOV: 7.65kV Ohio Brass

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B. Seller shall submit complete arrester information including catalog numbers and outline drawings for approval by the Engineer.

3.9 CONTROL CABINET

A. The enclosure shall be an outdoor, weather proof, NEMA type 3.

B. All control power, current transformer leads, alarm and control wiring shall be contained in the one (1) control cabinet.

C. The incoming control cables shall enter from the bottom of the cabinet.

D. Space shall be provided on the bottom of the enclosure for conduit entrances.

Conduit entrance shall have field removable bolted steel plate.

E. The enclosure shall be front accessible for the control wiring. The front access shall be by lockable, hinged, full length doors. Each door shall have three-point latching type handles. Doors shall be provided with a mechanism to secure the door in the open position at approximately 120°.

F. The cabinet doors shall be provided with a metal drawing pocket on the interior side.

G. The control cabinet shall be in an accessible location mounted at a convenient operating height.

H. All wiring and connections within the control cabinet shall be readily accessible for maintenance.

I. A 120 V, 60 Hz, 15A, single phase, GFI receptacle shall be mounted at an accessible location inside the control cabinet.

J. The control cabinet shall be provided with a protected heater strip rated 240 V, 60 Hz, operated at 120 V, 60 Hz. The heater shall be controlled with a thermostat. The heaters shall be located so as to not damage incoming cables or other equipment. A separate 2-pole, single throw, fused switch shall be provided for each heater circuit.

K. The main control cabinet shall have a 120 V, 60 Hz ceiling light with a clear glass safety globe to illuminate the interior of the cabinet. The light shall be controlled by an automatic push button switch actuated by opening the cabinet doors.

L. The heaters, receptacle, and lights shall be protected by an over-current automatic-trip circuit breaker with manual reset.

M. A 1/8” x 1” x 2’0” copper bar shall be provided in the control cabinet for grounding purposes. The bar shall be drilled and tapped for 10-32 screws on one-inch (1”) centers.

3.10 GROUNDING PROVISIONS

A. All non-energized metallic components of the transformer shall be grounded.

B. The transformer tank base shall have two, NEMA, 2-hole, copper faced grounding pads mounted at the base of the transformer, diametrically opposite

Carter 138kV-13.2kV Transformer Specification Page 17 of 29 from each other. The pads shall be provided with 1/2"-13 threads per inch tapped holes.

C. One similar ground pad on tank cover near neutral bushing.

D. Provide ¼” x 4” copper bus bar connecting first base-rail ground pad to neutral bushing ground pad, continuous across top of tank and down to opposite base-rail ground pad. Provide minimum 4/0 AWG copper cable between surge arrestor grounds and copper grounding bar.

E. Provide removable ground connection between neutral bushing and cover mounted ground pad. Minimum ampacity equal to copper bar.

F. A 2-hole NEMA transformer core ground pad shall be welded to the tank cover.

The pad shall be provided with 1/2"- 13 threads per inch tapped holes. Location shall be detailed on an outline drawing.

3.11 GASKETS

A. All bolted transformer tank or accessory openings shall be gasketed.

B. Gaskets shall be unaffected by hot insulating oil, retain their resiliency during the life of the transformer and be unaffected by the weather while maintaining oil and gas tightness.

C. Gaskets shall have a minimum compressed thickness of 1/8 inch.

3.12 FINISH

A. All sharp edges, scale, weld spatter and surface irregularities shall be removed by shot blasting, hand grinding, sanding or other appropriate manufacturing procedures.

B. The transformer enclosure shall be cleaned, primed and painted for maximum protection from the environment. Surfaces to be painted shall be washed and prepared by being shot blasted per SSPC-SP6 (Commercial Blast Cleaning) then detergent washed with an iron phosphate conversion coating and a non-chrome seal. -or- Blast to SSPC-SP10 (near white) condition and apply paint within 24 hours.

C. The internal of transformer tank, tank cover, and LTC interior walls shall be coated using a white, two-part, oil-resistant epoxy enamel, and compatible with the insulating fluid and, if applicable, in accordance with ASTM 3455.

D. The exterior surfaces are first painted using a two-part epoxy primer then top coated using a two-part urethane enamel. The transformer exterior shall be painted ANSI Gray 70, 3 mil exterior coating (range 3-5 mils) capable of meeting

IEEE C57.12.29.

E. The transformer exterior paint system shall achieve the test results shown in the table:

TEST ASTM TEST METHOD RESULTS

Adhesion D-3359-B No Removal

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Salt Spray B-117 1500 Hrs, 1/32" Loss of Adhesion

Humidity D2247 1000 Hrs @ 40⁰ C; No Blisters Impact D-2794 160 in/lbs., No Chipping U-V Resistance G-53 500 Hrs, Less than 15% Gloss

Change Taber Abrasion D-4060 More than 3,000 Cycles @ 3

Mils Oil Resistance 72 Hrs @100⁰ C No Effect Thermal Aging 1,000 Hrs @ 120⁰ C No Effect Pencil Hardness D-3363 2-H After 2 Weeks VOCs D-2369 3.5 #/gal.

F. Accelerated aging test must be performed on the paint to be used inside the tank. A plate steel sample coated with the white paint shall be submerged in transformer insulating oil and heated to 120oC. After 1,000 hours, there shall not be any measurable change in the painted surface or in the power factor of the oil used for the test.

G. Three, one pint, aerosol spray cans of transformer paint shall be supplied with the transformer.

3.13 WIRING

A. All general purpose and control wiring shall be tinned, stranded copper, SIS not smaller than No. 12 AWG terminated with ring-type insulated compression barrel type connectors equal to the T&B Sta-Kon connectors.

1. Bidder may make an exception to 3.13A for fan circuits or other circuits not adequately served by No. 12 AWG wiring. Bidder must note where SIS not smaller than No. 12 AWG is utilized so Buyer can evaluate.

B. All CT wiring shall not be less than No. 10 AWG SIS.

C. Each individual conductor shall be clearly identified using a machine printed, heat shrink type cable marker with destination labeling on both ends of the wire.

D. All wiring shall have no more than two (2) wires under each screw or connection point.

E. Heavy-duty terminal blocks with barriers shall be furnished and installed for external AC supply cables.

F. Blocks used for inter-panel wiring shall be readily accessible.

G. Terminal blocks shall be heavy duty, protected washer screw type equal to the

General Electric type EB-25. Marker strips shall be engraved, white backing with black lettering. All current transformer secondary leads shall be terminated in short circuiting, washer-screw type terminal blocks equal to the General Electric type EB-27. All leads for each individual current transformer shall be brought to a separate terminal block with individual ground connections.

Carter 138kV-13.2kV Transformer Specification Page 19 of 29

H. The arrangement and location shall be such that incoming and outgoing cables can be supported. Adjacent rows of terminal blocks shall be separated at least six inches (6”) from sides, top, bottom or front for all wiring.

I. One spare twelve (12) terminal-terminal block or 25% spare points on existing terminal blocks, whichever is greater, shall be provided.

J. All customer connection side of terminal blocks shall not be used by the Seller.

K. Wireway systems with removable covers, completely accessible for operation, troubleshooting, and maintenance, shall be used within the control cabinet.

Wireway systems shall be large enough to accommodate wiring for all existing and future devices. Bolted clamp-type wireway bundles may be used as an alternative as approved by the Engineer. The use of stick-on anchors with “tie-raps” for securing wire bundles is strictly prohibited.

3.14 NAMEPLATE

A. The nameplate shall be firmly attached with stainless steel self-tapping screws or stainless steel rivets.

B. The transformer nameplate shall be engraved stainless steel mounted on the control cabinet and include the information required by ANSI C57.12.00.

C. The current transformer nameplate(s) shall be located inside the control cabinet.

3.15 INSULATING OIL

A. The transformer shall be oil filled using insulating oil in conformance with ANSI/ASTM standards.

B. The insulating oil shall be certified to be non-PCB oil. The certification shall be permanently fastened to the tank of the transformer.

C. Transformer oil shall be inhibited per applicable standards.

3.16 ACCESSORIES

A. Alarm and trip contacts shall be Form C, 10 A rated, 250VDC contacts.

B. The transformer shall be provided with the following gauges:

1. Magnetic liquid level gauge shall be mounted to be readable from ground level and shall be furnished with two (2) sets each of low level alarm and trip contacts (device 71) wired to terminal blocks. The device shall be a Qualitrol or Engineer approved equal.

2. Top oil temperature gauge shall be mounted at eye level and shall be furnished with resettable drag hands, two (2) sets each of high temperature alarm and trip contacts wired to terminal blocks. The device shall be a Qualitrol or Engineer approved equal.

3. Winding hot spot temperature gauges shall be mounted at eye level and shall be furnished with resettable drag hands, two (2) sets each of high

Carter 138kV-13.2kV Transformer Specification Page 20 of 29 temperature alarm and trip contacts wired to terminal blocks. The device shall be a Qualitrol or Engineer approved equal.

4. Transformer inert-gas pressure-vacuum gauge mounted at eye level and shall be furnished with two (2) sets of high and low alarm contacts. The device shall be a Qualitrol or Engineer approved equal.

C. The transformer shall have a fault pressure relay (device 63) complete with seal-in relay and auxiliary contacts wired to terminal blocks. Provide an auxiliary seal-in relay and reset pushbutton. The device shall be a Qualitrol, no substitutions.

D. The transformer shall have a pressure relief device complete with a visible target and shall have two (2) sets of alarm contacts. The device shall be a Qualitrol or Engineer approved equal.

3.17 LOAD TAP CHANGER (LTC)

A. The transformer shall be complete with a LTC having a range of 10% above and 10% below the nominal secondary voltage in 32 equal 5/8% steps.

B. The LTC shall have full rated MVA on taps above and below nominal voltage. The LTC shall be connected to and regulate the low voltage winding.

C. The LTC mechanism shall be High Speed Resistive or Vacuum Reactance and designed for 500,000 electrical and mechanical operations before contact or vacuum bottle replacement is required. A contact life curve for the LTC being provided shall be supplied with the Manufacture’s proposal.

D. Should the LTC system quoted require a preventive auto-transformer or a series transformer, they shall be power class, round core/coil design and construction, and all windings shall be copper.

E. The LTC mechanism shall be mounted in a separate oil field compartment and capable of withstanding full vacuum in the main tank.

F. The drive mechanism shall be designed such that the LTC can be operated manually while energized under full load, safely with no potential harm to the operator or transformer.

G. If the drive mechanism can be stalled in the off-tap position, it shall be designed to include an alarm with remote contacts and be capable of maintaining full load indefinitely.

H. If the number of openings, gasketed or bolted, between the main tank and the LTC compartment exceeds seven (7), written explanation shall be provided.

I. The desiccant container shall be located at the operator level for ease of maintenance.

J. The LTC shall be equipped with the following accessories:

1. Top oil temperature gauge shall be mounted at eye level and shall be furnished with resettable drag hands, high temperature alarm and trip contacts (device 26) wired to terminal blocks.

2. Fault pressure relay (device 63) complete with seal-in relay and auxiliary contacts wired to terminal blocks Quaitrol no substitutions.

Carter 138kV-13.2kV Transformer Specification Page 21 of 29

3. Remote LTC indication sensing equipment (INCON or equal).

4. Liquid level gauge with alarm and trip contacts (device 71).

5. Drain valve with sampling device.

6. Tap selector with 33 operating positions.

7. Filling plug located at the top of the compartment.

8. The LTC tank bottom shall be sloped to drain oil away from the door.

9. The LTC mechanism shall be located at operator height.

10. The operating mechanism motor drive shall be easily accessible and not immersed in oil.

11. Local position indicator.

12. Operation counter.

13. The cover on the oil filled compartment shall be hinged to support itself when open regardless of the weight of the cover.

K. The Manufacturer shall include (in the main transformer tank) a current transformer for input to the line drop compensator. The Buyer will provide a potential source for operating the voltage regulating relay, which will consist of one line-to-ground potential transformer on X1 and X0 with a secondary voltage of 120 V.

L. The following LTC equipment shall be supplied and mounted in transformer main control cabinet:

1. Beckwith M2001D Tap Changer Relay

2. Current Loop Interface (and any necessary auxiliary power supplies or resistors to bring actual tap changer position into the Beckwith Controller)

3. Beckwith M-0329 LTC Backup Control

4. Automatic-manual selector switch with an additional two sets of spare

“a” and “b” contacts.

5. Raise and lower switches for manual operation.

6. Motor and controls protected by circuit breakers.

7. Voltage testing terminals.

8. The control cabinet shall be provided with a protected heater strip rated

240 V, 60 Hz, operated at 120 V, 60 Hz. The heater shall be controlled with a thermostat.

9. Terminal board in control compartment for termination of control and wiring.

M. The load tap changer nameplate shall be engraved stainless steel mounted on the load tap changer compartment and include the following information:

1. Manufacturer of the mechanism.

2. Model number of the mechanism.

3. Year of manufacturer.

4. Maximum rated through current of the mechanism.

5. Type of transition impedance (resistor or reactor).

6. Method of arc interruption (type of mechanism).

Carter 138kV-13.2kV Transformer Specification Page 22 of 29

7. Type of drive mechanism (energy spring or direct).

8. Amount of oil in the mechanism compartment.

Carter 138kV-13.2kV Transformer Specification Page 23 of 29

PART 4 - TESTING, FIELD SERVICES AND QUALITY CONTROL

4.1 REQUIRED FACTORY TESTING

A. All routine tests listed in ANSI C57.12.00 plus additional tests as specified herein are required. The transformer shall be fully assembled, including all permanent radiators and bushings during testing. Seller shall notify Engineer and Buyer 2 weeks prior to factory testing for Engineer and Owner to witness.

B. The following factory tests shall be performed as a minimum and three copies of the certified test reports shall be submitted to the Engineer

1. Winding Resistance

2. Winding Turns Ratio on all taps

3. Polarity and phase relation

4. Exciting current at rated voltage

5. Applied potential

6. Induced potential at each voltage at the ANSI test levels

7. Insulation power factor performed on all winding-to-winding and winding-to-ground insulation. Measured values exceeding 0.5% corrected to 20°C will not be accepted.

8. Impulse at each voltage at the ANSI test levels.

9. Frequency Response Analysis (FRA) from 20 Hz to 2 MHz.

10. Losses: no-load, load, auxiliary and total

11. Regulation and Efficiency

12. LTC tap ratios and function testing

13. H.V. and L.V. bushing insulation power factor, C1 and C2 tap tests

14. Full cycle temperature test (“heat run”) if design test results not available.

C. The factory resistance and losses tests shall include calculation procedures to correct the measurements to standard temperature basis data.

D. Current Transformers polarity, ratio, and saturation tests shall be performed per

ANSI C57.12.13.

4.2 FIELD SERVICES

A. Seller shall provide a field services engineer to direct the dressout of the transformers after it has been placed on the foundation. Seller shall provide field services technician(s) to complete the dressout and testing of the transformers after it has been placed on the foundation. The field services engineer shall direct the assembly, filling, and connection of any equipment such as, but not limited to, bushings, radiators, nitrogen systems, drying and vacuum filling with oil, which were removed or modified for shipping and are required for transformer operation.

Carter 138kV-13.2kV Transformer Specification Page 24 of 29

B. Field Service Engineer shall conduct a complete visual and mechanical inspection when field dressing is complete and shall submit a written report containing the following, at a minimum:

1. Compare equipment nameplate data with the drawings and specifications.

2. Inspect physical and mechanical condition including documented readings or observations from manufacturer supplied SFRA and Impact recorders

3. Inspect anchorage, alignment, and grounding.

4. Verify the presence of PCB content labeling.

5. Verify removal of any shipping bracing after placement.

6. Verify the bushings and transformer is clean.

7. Verify that alarm, control, and trip settings on temperature and level indicators are as specified.

8. Verify that cooling fans and/or pumps operate correctly and that fan and pump motors have correct over-current protection.

9. Verify correct liquid level in tanks and bushings.

10. Verify that positive pressure is maintained on gas-blanket transformers.

11. Perform inspections and mechanical tests as recommended by the manufacturer.

12. Confirm radiator valves are locked in the open position.

13. Take oil sample and have complete oil test report completed.

14. Confirm No Load Tap Changer operation. Test load tap changer in accordance with Seller’s Instruction Book.

15. Any other inspections normally performed by the Seller

4.3 ACCEPTANCE TESTING AFTER INSTALLATION

A. The following tests will be performed by an independent testing company contracted by the Buyer:

1. Winding and core ground resistance

2. Winding Ratio of high and low voltage on all taps

3. SFRA Testing

4. Polarity and phase relation of winding

5. Polarity and ratio tests of Current Transformers

6. Insulation power factor and excitation current test of all windings

7. H.V. and L.V. bushing insulation power factor, C1 and C2 tap tests

8. H.V. and L.V. arresters power factor

9. Functional testing of all alarms to terminal blocks

B. The transformers shall be accepted based on the results of the field tests.

Carter 138kV-13.2kV Transformer Specification Page 25 of 29

PART 5 - PROPOSAL

5.1 GENERAL

A. The Seller shall complete this section in its entirety and submit it with their proposal.

B. “Seller”

C. Location of factory

5.2 PROPOSAL DATA

A. Base Price-FOB Transformers Foundation Carter Substation QUANTITY TWO (2)

B. Shipping Dates Approval Drawings:

Equipment in full:

C. Field Service Engineering and technicians Including travel, lodging and expenses (3 days required)

D. Cost of additional days of Service Engineer/Tech $ /day

E. Cost of Spare HV Bushing $

F. Cost of Spare LV Bushing $

G. Amount and type of oil filling required in field

H. Location of factory

I. Ship by truck or rail

J. Rail siding name if by rail

5.3 LOSS SUBMITTALS

A. The Seller shall guarantee that their proposed transformers loss values will not be exceeded. The certified test values will be compared and evaluated with the losses provided in the Seller's proposal. If the loss guarantees are exceeded, the

Carter 138kV-13.2kV Transformer Specification Page 26 of 29 difference between the total bid loss evaluation and the total certified test report loss evaluation will be deducted from the transformers invoice.

B. Losses

1. No-load losses at rated nominal voltage kW

2. No-load losses at 110% rated nominal voltage kW

3. Full-load losses (65°C ONAN/ONAF/ONAF rating)

(Corrected to 75°C) kW

4. Auxiliary losses (65°C ONAN/ONAF/ONAF rating) (Corrected to 75°C) kW

5.4 EXPECTED ELECTRICAL DATA

A. Submit data which demonstrates that transformers meets short-circuit requirements listed in paragraph 7 of IEEE C57.12.00 by one of the following methods:

1. Certified test data showing that transformers with core and coil identical in design and construction and identical or similar with respect to kVA capacity, kV ratings, BIL, impedance, and voltage taps have been tested without failure for short-circuit strength.

2. History of successful experience with transformers of identical or similar ratings, design and construction. List transformers in service with core and coils which are essentially identical in design, construction and manufacture to transformers covered by this Specification and provide information on date of installation, locating and failures if any.

B. Exciting current at 100% rated nominal voltage

C. Exciting current at 110% rated nominal voltage

D. Percent positive sequence impedance based on 65°C

ONAN rating

E. Positive sequence impedance X/R ratio

Carter 138kV-13.2kV Transformer Specification Page 27 of 29

F. Nominal High Voltage Rating kV

G. Nominal Low Voltage Rating kV

H. Transformers MVA Ratings / / MVA

ONAN/ONAF/ONAF

I. RIV per NEMA TR-1 not to exceed mV

J. Audible sound level not to exceed dBA @ ONAN dBA @

ONAN/ONAF/ONAF

K. Regulation at ONAN rating (Calculated per ANSI/IEEE C57.12.90)

% @ 1.0 pf

% @ 0.8 pf

5.5 MECHANICAL DATA

A. Bushing manufacturer and catalog number: (HV)

(LV)

B. Weights and Volumes: Core and Coils lb

Tank & Access lb

Oil lb

Total lb

Shipping Weight lb

Oil Volume gal

C. Dimensions:

1. Height to top of tank in

Carter 138kV-13.2kV Transformer Specification Page 28 of 29

2. Height to top of HV bushings in

3. Height to top of LV bushings in

4. Bearing Dimensions: Width in

Length in

5. Overall dimensions including radiators: Width in

Length in

5.6 ADDITIONAL INFORMATION

A. Anticipated timeline for delivery of drawings to be approved by the Engineer.

Delivery of drawings is the number of weeks after receipt of order.

1. Outline, general arrangement, assembly, installation, and foundation arrangement drawings. Weeks

2. Drawings of transformers nameplate with schematic and phasor diagram, electrical ratings, weights and winding tap data in tabular format per ANSI standards. Weeks

3. Schematic and wiring diagrams for tap arrangements of wiring of accessories. Weeks

4. Wiring and connection diagrams for all control, current, potential and alarm circuits. Weeks

B. Any exceptions to these specifications shall be clearly stated and attached to the bid data sheets.

C. Attach all bid submittal documentation as required by Submittal Section of this

Specification.

D. Manufacturer and model of load tap changer

Carter 138kV-13.2kV Transformer Specification Page 29 of 29

5.7 AUTHORIZED SIGNATURE

A. Seller:

B. Signature & Title:

C. Address:

City:____________________ State:_____ Zip:___________

D. Date:____________________