KEYS_Bid_2026_Specifications_for_Purchase_of_Transformers.pdf

KEYS BID 20-26 SPECIFICATIONS FOR THE PURCHASE OF TRANSFORMERS

CALL FOR BIDS

THE UTILITY BOARD OF THE CITY OF KEY WEST, FLORIDA, operator of Keys Energy Services (KEYS), hereby gives notice to prospective bidders that sealed proposals will be received by KEYS electronically until 10:00 a.m. on Friday, October 16, 2026 for:

KEYS has instituted VendorLink and DemandStar systems to provide current information to potential bidders. These systems will allow you to receive bid information quickly and at your convenience 24 hours a day, 7 days a week. Specifications may be obtained from their websites at www.myvendorlink.com or www.DemandStar.com. Registered vendors will be notified automatically of all Requests for Proposals. You may also visit www.KeysEnergy.com for links and download information for all KEYS bid specifications.

It shall be the sole responsibility of each bidder to have their bid electronically delivered on or before the time for opening proposals last announced to bidders. Emailed proposals will not be accepted. Should a vendor not be able to submit via VendorLink or DemandStar, paper submittals will be accepted. Paper submittals must be received prior to the opening date and time in order to be considered. Paper submittals, if applicable, are to be delivered via FedEx, UPS, or in-person to:

Keys Energy Services Bid Opening Committee – KEYS Bid 20-26 6900 Front Street Extended Key West, FL 33040 Note: This address does not receive US Postal Service.

Any proposal received after the time last announced for opening proposals may be retained by KEYS or returned to the bidder, but such proposal may be rejected as not responsive.

Vendors with questions pertaining to this bid specification must submit them in writing via email to purchasing@keysenergy.com no later than Friday, October 2, 2026 at noon. Any questions received after noon on Friday, October 2, 2026 will not be addressed.

Each proposal should constitute an offer to KEYS, as outlined therein, and should be irrevocable after the time announced for the opening thereof.

At a meeting of the BID OPENING COMMITTEE to be held virtually on Friday, October 16, 2026 at 10:00 a.m. Proposals will be opened and vendor names will be publicly read aloud.

KEYS reserves the right to reject any or all proposals, to waive irregularities and informalities in any or all proposals, and to separately accept or reject any item, items, bid schedule or bid schedules of the proposal which KEYS deems to be in the best interest of the Utility Board.

Tyler Randolph, Purchasing Supervisor http://www.myvendorlink.com/ http://www.demandstar.com/taf/agencycp.taf?_function=list&A=335 http://www.keysenergy.com/ mailto:purchasing@keysenergy.com

GENERAL

Keys Energy Services (KEYS) is a municipal electric utility supplying power to residents of the lower Florida Keys. KEYS is located in the extreme southern tip of peninsular Florida, situated in Monroe County, Florida, primarily what is considered the “Lower Keys”, which extends eastwardly from Key West to the west end of the Seven-Mile Bridge. Corporate Offices are located at 1001 James Street, Key West, Florida and the Transmission and Distribution (T&D) Facility is located on Stock Island at 6900 Front Street Extended, Key West, Florida 33040.

KEYS and its representatives have exercised due care in preparing this Request for Proposals (RFP). All information contained herein is believed to be substantially correct. However, bidders should verify information independently if desired. KEYS and its representatives do not warrant the accuracy of information contained herein.

BID SPECIFICATIONS

Specify and include manufacturer of distribution transformer and all technical data on transformers provided.

After bids are received KEYS reserves the right to adjust the quantities to meet KEYS budget constraints.

Transformer losses will be utilized as one of the evaluation criteria. The evaluation process is outlined below.

T.O.C. = Price + (NL Watts X 8.380) + (LL Watts X 2.258) Where:

T.O.C. = Total Owning Cost Price = Total Unit Price NL Watts = Quoted No-Load Losses in Watts LL Watts = Quoted Load Loss Watts

Failure to submit transformer losses along with bid will result in non-compliance and the bid will be rejected.

All test data will be supplied as specified in bid package.

An “equivalent” group of bidders is created by determining all Total Owning Cost amounts that are within 2.5% of the lowest Total Owning Cost.

All "equivalent" bidders are compared on the basis of Total Selling Price. The technically compliant "equivalent bidder" with the lowest Total Selling Price or best bid is determined to be the best bidder and is awarded the contract for that particular transformer group.

KEYS will also consider lead times in the evaluation criteria for transformers that have short term needs.

BID EXCEPTIONS/DEVIATIONS TO SPECIFICATIONS

All deviations to specifications and KEYS’ Terms and Conditions, as stated in this document, must be noted in writing by the bidder at the time of bid submittal. The absence of a written list of deviations at the time of bid submittal will hold the bidder strictly accountable to KEYS’ specifications and terms and conditions as written. Deviations not previously agreed upon will be grounds for rejection of the material and/or equipment upon delivery.

ESCALATION/DE-ESCALATION

All bid prices, including but not limited to item unit prices and shipping rates, shall remain firm unless the bidder indicates in writing at the time of bid submittal the prices which are subject to escalation/de-escalation. If an escalation/de-escalation method is specified, the Bidder shall indicate the specific items subject to escalation/de-escalation, and shall provide the method and indices to be used, so that at any given time the amount thereof may be calculated utilizing the specified method and indices.

In the event an escalation/de-escalation is based on manufacturer-imposed escalation/de-escalation metrics, the pricing impact of which cannot be known at the time of bid submittal, the Bidder shall provide with the Bid the escalation/de-escalation metric applied by the manufacturer.

In no event shall an escalation/de-escalation result in an increase in Bidder’s profit relative to the profit included within the amounts set forth in the Bid.

No later than five days after bidder receives the finalized price for any item or cost element which was specified in the Bid as being subject to escalation/de-escalation (i.e. shipping costs, item prices, etc.), Bidder shall provide such amount to KEYS, in writing, including all back-up documentation and calculations necessary to determine whether the finalized price was calculated pursuant to the indices and metrics provided in the Bid.

In the event any finalized price is not calculated in accordance with the metrics set forth in the Bid, or if reasonably sufficient documentation is not provided to allow a determination whether the finalized price was calculated in accordance with the metrics set forth in the Bid, KEYS, at its option, shall be entitled to all remedies included within the Contract, including but not limited to termination of all or part of the Contract.

DRAWINGS AND APPROVAL

APPROVAL DRAWINGS

The vendor shall submit electronically the transformer outline drawing, nameplate, and bill of materials for approval within two (2) weeks of award. KEYS must approve drawings prior to manufacturing the equipment. The drawing shall be in PDF or AutoCAD format and may be submitted via email to purchasing@keysenergy.com. KEYS shall review the drawings and return them with any comments within two (2) weeks. Any drawings returned to vendor marked "Not Approved" must be resubmitted for approval after making corrections. Drawings returned to vendor marked "Approved" or "Approved with exceptions as noted" need not be resubmitted for approval but must be corrected and returned as final drawings. All transformers shipped must be in accordance with the approved drawings.

INDIVIDUAL ORDERS

The manufacturer shall provide KEYS with one (1) sets of final drawings before any transformers are shipped.

TEST RESULTS

The actual certified test report values showing the values for No Load Loss (at 20o C) and Load Loss (at 85o C) and Total Loss (No-Load Loss plus Load Loss) for each unit supplied under this

Bid Specification shall be sent to KEYS PRIOR to unit delivery. Invoices will not be paid until this report has been received. The file format shall be Microsoft Excel. Files may be provided via email (preferred) or a CD.

The report shall contain:

a. the date of manufacture

b. manufacturer

c. serial number

d. size i.e., high and low voltage ratings

e. the purchase order number

f. stock number

g. unit cost

h. the specified test values

i. any other information specified on the Purchase Order or deemed desirable by the manufacturer

MANUFACTURER’S PROPOSAL

TRANSFORMER PARAMETERS

a. Two of the considerations for purchase of distribution transformers will be total owning cost and estimated delivery dates. To be considered, bidders must supply the following transformer parameters for evaluation:

b. The guaranteed (core) no load losses in watts, at 20°C.

c. The guaranteed average (copper) full load losses in watts, at 85°C.

d. Impedance in percent at 85° to three significant figures.

e. Exciting current in percent to three significant figures.

f. Estimated delivery dates will be considered in the event lead times do not support

KEYS anticipated project timeline.

The guaranteed average values of no load loss, full load loss and total losses shall not exceed the bid losses by the following tolerance percentages per IEEE C57.12.00, latest revision, where guaranteed average losses is defined as: “the average of the losses of several transformers in a shipment.” The (core) no load losses of a transformer shall not exceed the specified no load losses by more than 10%, and the (copper) full load losses of a transformer shall not exceed the specified total losses by more than 6%. The actual impedance received shall not exceed quoted values by more than +7.5% and exciting current of transformers received shall not exceed quoted values by more than +25%.

Units exceeding these limits shall not be shipped to KEYS. At KEYS discretion, if any such unit is found to have been shipped, KEYS will have the option of returning the units at the vendor’s expense or shall be compensated based upon the compensation penalty below.

a. Quoted (NL x 8.380) + (LL x 2.258) x # units = Q

b. Test (NL x 8.380) + (LL x 2.258) x # units = T

c. Q - T = Compensation penalty

The loss penalty relative to impedance shall be equal to the excess or non-normal costs incurred by KEYS in utilizing the nonconforming transformer. The penalty charge shall include engineering, transportation, installation, and material costs of any additional equipment needed to utilize the transformer. There will be no loss penalty relative to out of tolerance exciting current. In all cases, the loss penalty shall not exceed the quoted price of the transformer.

TECHNICAL SPECIFICATIONS

Word Usage: When a standard is used on a mandatory basis, the words shall and must indicate mandatory requirements. The words should and may refer to matters that are recommended or preferred, but alternatives could be considered by KEYS. If exceptions are taken to the specifications, the Bidder shall include in the proposal a section entitled "Exceptions to The Specifications" and propose substitutions/alterations. Any exception listed elsewhere in the proposal will not be considered and the proposal may be considered non-responsive. If no exceptions are taken, the Bidder shall indicate "None".

The term stainless steel as used in this specification shall mean 304/304L.

1.0 POLE MOUNT TRANSFORMERS 7970/13800Y

All transformers will be installed on KEYS 13,800 nominal voltage distribution system. KEYS voltage is 13,800 volts phase to phase and 7,970 volts phase to ground. All transformers supplied shall be capable of operating on this voltage system.

Unless otherwise specified herein, all transformers shall be in accordance with the latest revision of the following standards:

A. IEEE C57.12.00, latest revision, Standard General Requirements for Liquid-Immersed Distribution, Power, and Regulating Transformers.

B. ANSI C57.12.20, latest revision, Standard for Overhead Type Distribution Transformers, 500 kVA and smaller: High Voltage 34,500 volts and Below, Low Voltage 7970/13800 and Below.

C. IEEE C57.12.31, latest revision, IEEE Standard for Pole Mounted Equipment – Enclosure Integrity

D. IEEE C57.91, latest revision, IEEE Guide for Loading Mineral-Oil-Immersed Transformers E. 10 CFR Part 431, Energy Conservation Program for Commercial Equipment: Distribution

Transformers Energy Conservation Standards, Final Rule.

1.1 RATINGS

All transformers shall have the capability of meeting or exceeding the recommended load limits as shown in the Guide for Loading Mineral Oil-Immersed Overhead Type Distribution Transformers, C57.91, latest revision, Section 8.3.

A. Transformers shall be specified as a 2-bushing transformer with fully insulated winding.

1.2 NOISE LEVEL

A. Noise level shall not exceed ANSI standards for distribution class transformers.

(References NEMA TR-1).

1.3 THERMOSETTING INSULATION

A. All transformers shall employ an approved bonded thermosetting insulation system in the construction of the coil assembly.

1.4 TRANSFORMER CORE MATERIAL

A. All transformers shall employ cores constructed of traditional silicon steel unless otherwise specified on the purchase order.

B. All coil designs shall meet or exceed the ANSI short circuit requirement.

C. Only adhesive coated paper shall be used in the coil design.

1.5 DIELECTRIC FLUID

A. Coolant shall be the following:

a. Shall use Mineral Oil (Standard ASTM D3487) or biodegradable coolant.

Note: If biodegradable coolant is used, the transformer must be clearly marked as containing biodegradable coolant.

B. General Requirements

a. PCB Content shall be less than 2 ppm on a dry weight basis when tested in accordance with an EPA approved method.

Note: Any transformer which is not in compliance with this requirement will be returned to the manufacturer for replacement.

C. Label Requirements

a. All transformers should have an approved durable label (Uticom U6060 or U6060B or exact equivalent).

Note: Equivalent must be approved by KEYS prior to bid award.

b. Background color

i. Shall be a medium blue background.

c. Lettering size and color

i. Shall be a minimum 2” white lettering.

d. Contents

i. Shall describe the dielectric fluid as non-PCB.

ii. Shall state its maximum PCB concentration at the time of manufacture.

e. Location on transformer

i. Shall be placed on the outside at a location to be easily read from the ground.

D. Coolant shall be the following:

a. Shall use Mineral Oil (Standard ASTM D3487) or biodegradable coolant.

Note: If biodegradable coolant is used, the transformer must be clearly marked as containing biodegradable coolant.

E. General Requirements

a. PCB Content shall be less than 2 ppm on a dry weight basis when tested in accordance with an EPA approved method.

Note: Any transformer which is not in compliance with this requirement will be returned to the manufacturer for replacement.

F. Label Requirements

a. All transformers should have an approved durable label (Uticom U6060 or U6060B or exact equivalent).

Note: Equivalent must be approved by KEYS prior to bid award.

b. Background color

i. Shall be a medium blue background.

c. Lettering size and color

i. Shall be a minimum 2” white lettering.

d. Contents

i. Shall describe the dielectric fluid as non-PCB.

ii. Shall state its maximum PCB concentration at the time of manufacture.

e. Location on transformer

i. Shall be placed on the outside at a location to be easily read from the ground.

1.6 EXTERIOR FINISH

A. Color Requirements

a. Shall be Munsell number 5BG 7.0/0.4 ANSI Gray #70.

B. Finish Requirements

a. Shall meet or exceed requirements in IEEE C57.12.31, latest revision.

b. Shall consist of sufficient coat(s) of high grade quality paint which will not fade, blister or chalk and will be scuff resistant. This is to insure long field life (20 years plus) with minimum maintenance under severe environmental conditions such as salt spray, high humidity and high ultraviolet levels.

C. Coating for 167kVA and below Requirements

i. Shall be supplied with an insulated coating.

D. Markings

i. There shall be no additional markings, signs or decals unless specified.

1.7 BASIC LIGHTNING IMPULSE INSULATION LEVELS (BIL)

A. Per Table 4 ANSI C57.12.00, latest revision:

a. High Voltage Insulation Class: 15 KV, 95 KV BIL 25 kV, 125 kV

b. Low Voltage Insulation Class: 1.2 kV, 30 kV BIL

1.8 CONSTRUCTION

A. General Requirements

a. Transformers shall be assembled in the USA and major components made in the

USA.

b. Taps

i. All transformers shall have four (4) 2.5% full capacity taps (3 below and 1 above voltage rating):

Tap % Voltage 1(a) 102.5% 8169V 2(b) 100.0% 7970V 3(c) 97.5% 7771V 4(d) 95.0% 7572V 5(e) 92.5% 7372V

Table 1.1 – Tap Percentages

c. Markings

i. Internal secondary leads shall be identified with appropriate markings permanently embossed in the lead that corresponds with the lead markings on the nameplate.

d. Mounting

i. All transformers shall be arranged and equipped for single position mounting.

B. Material Requirements

a. Tank, cover, bands and hardware

i. BASE BID

1. Shall be 304/304L stainless steel.

b. High voltage bushings

i. Shall be porcelain and 17” creep.

c. Low voltage bushings

i. Shall be porcelain.

d. All paints and/or coatings

i. Shall be free of lead and chromates

ii. The color shall be Munsell # 5BG 7.0/0.4 ANSI Gray #70.

C. Tank Cover Requirements

a. Shall be removable.

b. Shall be metallically bonded to the transformer tank by means of an external strap.

c. Shall have slope for moisture run-off.

d. Shall be stainless steel.

D. Grounding Requirements

a. Transformers shall be equipped with a solder-less tank grounding connector located in the tank ground pad.

b. Bidder shall provide copper ground straps

i. Between secondary and neutral bushing and the tank ground.

ii. Between the lightning arrestor and tank ground.

1.9 OIL PRESERVATION

All transformers shall be equipped per ANSI C57.12.20, latest revision, 6.2.5 Relief of Excessive Pressure.

A. Pressure Relief Valve and Transformer Failure Device

a. Each transformer shall be equipped with a non-resettable device which detects and provides external indication of internal transformer faults, and also incorporates pressure relief functionality. The approved device is manufactured by IFD Corporation or approved equal.

b. Device shall provide external indication visible from the ground after an internal fault has occurred.

c. This device will function as replacement for the conventional PRV.

1.10 PROTECTIVE DEVICES

A. Lightning Arrestor

a. Rating

i. Shall be 12kV.

b. Type

i. Shall be Heavy Duty Class, direct disconnect polymer housed.

c. Shall also be furnished/installed with an adequate size copper strap to tank case.

d. Suitable provisions shall be provided for mounting a distribution lightning arrester adjacent to each primary bushing (H1 side).

e. Shall be provided or installed with all hardware and brackets for mounted installation.

f. Arrestors shall be designed to prevent overheating during normal operation from excessive current leakage.

i. An acceptable example: A stainless steel collector plate can be placed between the polymer housing and isolator bracket to divert excessive leakage current.

Note: External secondary MOV arrestors are required regardless of the secondary winding. Only approved ANSI heavy duty secondary low voltage arrester will be accepted.

1.11 NAMEPLATE INFORMATION

All transformer nameplates shall be mounted in such a manner that there are no sharp edges exposed, be made of stainless steel (PREFERRED) and shall exist for all kVA ratings per IEEE C57.12.00, latest revision.

A. Nameplate shall have the following informational items:

a. Serial number.

b. Month/year of manufacture.

c. Class (ONAN, ONAF etc.)

d. Number of phases.

e. Frequency.

f. kVA rating

g. Voltage rating (High voltage and Low voltage).

h. Tap voltages.

i. Temperature rise, degree Celsius.

j. Polarity (single-phase transformer).

k. Phasor diagram (polyphase transformers)

l. Percent impedance.

m. Approximate total mass in pounds.

n. Connection diagram.

o. Name of manufacturer.

p. Installation and operating instructions reference.

q. The word transformer or autotransformer.

r. Type of insulating liquid (generic name preferred, PCB Content).

s. BIL rating of high voltage winding (both high voltage BIL rating on dual voltage transformers).

t. Bar-code in accordance with IEEE C57.12.35, latest revision.

1.12 MAXIMUM TRANSFORMER DIMENSIONS AND WEIGHT

Transformers supplied under this specification shall conform to the following maximum weights, tank heights, and tank diameters:

Transformer Size (kVA)

Maximum

Weight (LBS)

Maximum

Tank Height

Maximum Tank

Diameter 5, 10, & 15 375 32.0" 16.0"

25 490 32.0" 18.5"

37.5 690 33.5" 22.5" 50 750 34.5” 23.0” 75 1,010 36.5" 25.5" 100 1,050 36.5" 25.5" 167 1,150 39.5" 25.5" 250 1,886 48.5" 38" 333 3,029 51” 42" 500 4,088 67" 48"

Table 1.2 – Pole mount weight and height parameters

1.13 PACKING AND SHIPPING

A. No manufacturer's installation instructions are to be packaged or shipped with the transformers.

B. Copies of installation instructions shall be delivered to KEYS.

C. Each transformer shall be banded to a two-way entry, pallet.

D. The pallet must be of such dimensions as to provide two inch (2") clearance of the transformer at its widest outside measurements on all four sides.

E. All transformers shall be positioned on pallets allowing decal to be visible from the front of the pallet.

F. The pallet must provide a minimum of 2-1/2" of fork under clearance.

G. The transformer shall be banded to the pallet in such a way as to prevent shifting of the unit on the pallet surface during transit, while allowing the unit to be handled by sling or by fork truck without removing the banding.

H. Unless otherwise specified at the time of purchase, transformers shall be shipped on open-bed trailers suitable for side unloading with fork truck.

1.14 DELIVERY

A. All POLE MOUNT transformer deliveries must be F.O.B. Stock Island Warehouse, 6900 Front Street, Extended, Stock Island (Key West) Florida, 33040.

B. KEYS will not be responsible for off-loading delays when notice of delivery is not given in advance.

C. Notification on delivery must be made no less than 48 hours prior to delivery by contacting KEYS Warehouse at (305) 295-1192 or (305) 295-1212 or emailing purchasing@keysenergy.com.

D. Deliveries must be made Monday through Friday between the hours of 7:30am and 3:30pm except for holidays. KEYS does not allow overnight parking of freight trucks on its property.

E. All deliveries must be made on an open-bed trailer suitable for side unloading using a forklift. Deliveries made by standard semi-trailer, enclosed truck, or sealed container will be refused at the time of arrival.

2.0 SINGLE PHASE, DEAD FRONT PAD MOUNT TRANSFORMERS

All transformers will be installed on KEYS 13,800 nominal voltage distribution system. KEYS voltage is 13,800 volts phase to phase and 7,970 volts phase to ground. All transformers supplied shall be capable of operating on this voltage system. This section covers ANSI, pad mounted, single phase, 60 hertz mineral-oil filled, self-cooled distribution transformers, 167 KVA and smaller.

of the following:

B. ANSI C57.12.25, latest revision, Requirements pad mounted, compartmental-type, self-cooled, single-phase distribution transformers with separable insulated high-voltage connectors: High Voltage 34500 GRDY/19920 volts and below, Low-voltage, 240/120;

167 kVA and smaller.

C. ANSI C57.12.28, latest revision, Pad-mounted Equipment - Enclosure Integrity D. IEEE C57.12.90, latest revision, Standard Test Code for Liquid-Immersed Distribution, Power, and Regulating Transformers E. 10 CFR Part 431, Energy Conservation Program for Commercial Equipment: Distribution

Transformers Energy Conservation Standards, Final Rule F. ASTM D3487-09 Standard Specifications for Mineral Insulating Oil Used in Electrical

Apparatus.

2.1 RATINGS

A. Typical KVA ratings are as follows: 25 – 333

2.2 NOISE LEVEL

2.3 DIELECTRIC FLUID

a. Shall use Mineral Oil (Standard ASTM D3487) or biodegradable coolant.

Note: If biodegradable coolant is used, the transformer must be clearly marked as containing biodegradable coolant.

B. General Requirements

a. PCB content of less than two (2) ppm on a dry weight basis when tested in accordance with an EPA approved method.

Note: Any transformer which is not in compliance with this requirement will be returned to the manufacturer for replacement.

C. Label Requirements

a. All transformers shall have an approved durable label (Uticom U6060 or

U6060B or exact equivalent).

b. Background color

i. Shall be a medium blue background.

c. Lettering size and color

i. Shall be a minimum 2” white lettering

d. Contents

i. Shall describe the dielectric fluid as non-PCB.

ii. Shall state its maximum PCB concentration at the time of manufacture.

e. Location on transformer

i. Shall be placed on the outside at a location to be easily read from the ground.

2.4 EXTERIOR FINISH

A. Color requirements

a. Shall be Munsell number 7GY 3.29/1.5.

B. Tank and cabinet material requirements

a. Shall be made of 304/304L stainless steel.

C. Coat and finish requirements

a. All paint and/or coatings including topcoats, intermediate coats and primers shall be free of lead.

b. Shall have a corrosion resistant finish that shall meet or exceed ANSI C57.12.28, latest revision.

c. Shall consist of sufficient coat(s) of high grade quality paint which will not fade, blister or chalk and will be scuff resistant.

Note: This is to insure long field life (20 years plus) with minimum maintenance under severe environmental conditions such as salt spray, high humidity and high ultraviolet levels.

a. There shall be no additional markings, signs or decals unless specified.

2.5 CONSTRUCTION

A. General requirements

USA.

b. Opening between tank wall and front sill flange shall be a minimum of 15-1/2”.

c. Shall be designed to minimize areas where water and corrosive elements can accumulate.

d. Shall be designed to be lifted or slid on to a pad without disturbing entrance cables.

e. Transformer sizing, clearances, and arrangements shall follow figure 1b of ANSI

C57.12.25, Latest Rev.

f. Enclosure security requirements as stated in ANSI C57.12.28, Latest Rev.

(repeated information may be listed in other categories for reiteration)

g. 2 parking stands to be equipped per the figure above.

B. Material requirements

a. All metal shall be 304/304L stainless steel where possible unless specified herein.

b. Nameplate

c. Exposed hardware (e.g. screws, brackets, etc…)

d. Sill, hood, and operating mechanisms

e. Faceplate hardware (including parking stand)

f. Sill hold down cleats

g. Hinges (including pins)

h. Lifting bolts

i. Retainer

j. Exceptions to stainless

i. Ground connector (See grounding in section 2.5 for detail) C. Welding requirements

a. Exterior welds shall be full welds.

b. Spot, tack, or skip welds are not acceptable for attaching hinges, brackets, grounding bosses, etc.

c. Hinges shall be continuously welded to the tank and lid.

D. Tank securement

a. Two (2) sill hold down cleats shall be provided and support ½” stainless steel mounting bolts with a slotted hole.

b. Compartment sill shall be mounted utilizing a minimum of two (2) 3/8” bolts on each side of the compartment.

E. Door requirements

a. Hood type doors are NOT acceptable. Side opening hinged doors shall be provided and meet the requirements of ANSI C57.12.25 paragraph 6.1.2.

b. Door latch shall operate such that it avoids all primary and secondary connectors and cables.

c. All door types shall have provisions for a ½” penta head captive bolt with NC Class 2 threading as stated in ANSI C57.12.28, Latest Rev for enclosure security.

d. Latch shall support a Best Co. #5B620 padlock or equivalent.

e. Penta head bolt shall be unable to be removed prior to padlock removal for security.

f. Hinge gauge shall be the same or greater than the gauge of the door.

F. Lifting provision requirements

a. Transformer shall have 5/8” stainless steel threaded inserts.

b. Inserts shall be placed as to allow a single lift from two (2) points (one on each side of the transformer).

c. Lifting bolts shall be provided - 5/8” x 2-1/4” to 3” stainless steel

G. Pressure requirements

a. Minimum sealed tank pressure capability without permanent distortion shall be 7

PSI.

b. Minimum sealed tank withstand pressure shall be 15 PSI.

i. At the minimum tank withstand pressure, no oil leak shall be initiated and no component or bushing shall be expelled from the unit.

c. If there is deformation, the unit shall remain tamper-proof and it shall be possible to open the compartment for access to the cable terminations.

d. The product of the minimum tank withstand pressure in PSIG (without a pressure relief device in place) and the cubic inches of air space above the transformer 140o C. oil level shall equal or exceed 16,500.

e. Reference section 2.10 for pressure relief detailed information.

H. Cooling requirements

a. It is KEYS preference to have tanks without cooling fins.

i. If design requires cooling fins, they shall be no point or edge that is sharp including the attachment to the tank.

ii. Fins must be designed to minimum possible protrusion from tank.

I. Protection requirements

a. A ½” to 1” drain plug shall be provided near the center of the tank.

b. Drain plug shall follow all ANSI/IEEE standards for placement to avoid inaccessible locations.

J. Grounding requirements

a. Transformer shall consist of 2 ground pads

i. ½”-13 threaded boss, 7/16” deep

b. Shall contain a bronze type tank ground connector that supports up to a #6 to

250MCM copper conductor, Penn Union GSE-025 or equivalent. Must be approved by KEYS prior to bid acceptance if choosing an equivalent.

2.6 HIGH VOLTAGE TERMINATIONS

A. All transformers shall have four 2-1/2% full capacity taps, three below and one above rated voltage as shown below:

Tap % Voltage 1(a) 102.5% 8169V 2(b) 100.0% 7970V 3(c) 97.5% 7771V 4(d) 95.0% 7572V 5(e) 92.5% 7372V

Table 2.1 – Tap Percentages

B. The transformer shall be furnished with the required high-voltage removeable stud bushing wells, Elastimold K1601PC-S2-R or approved equal, for use with replaceable 200-amp, 15 kV load break type-bushing inserts per IEEE 386. Bail tabs or holes are required on the bushing well clamp. Specific written approval is required for use on wells other than the one specified (Bidder shall provide documentation for comparison). Bushing inserts will be furnished and installed by the vendor (Elastimold or Equal).

C. The bushing wells shall be orientated so that the elbows can be operated with a hot stick.

D. A bracket for ground or test bushing shall be located between primary bushings.

2.7 HIGH VOLTAGE PROTECTION DEVICES

A. Fuse requirements

a. The primary fuse shall be externally replaceable equivalent to expulsion, bayonet type.

b. The fuse links will be load sensing in series with coordinated isolation links.

c. The fuse holder shall be located so the eye will not touch the lid in any position.

Note: Stops to prevent rotation of the eye to the twelve o'clock position are not acceptable.

Bayonet type fuses required for pad mount transformers.

Size Phase Type 25 1 C04 50 1 C08 75 1 C08 100 1 C10 167 1 C12 250 1 C14 333 1 C14

B. Isolation link

a. If provided, then the link shall be in series with the bayonet oil fuse cutout.

b. Shall be sized to melt when the cutout rating is exceeded.

c. This link will be designed to operate at high fault conditions only.

(Optional - not required by KEYS unless an IEEE or ANSI requirement).

C. Drip shield requirements

a. Shall be provided under the bayonet fuse.

b. Shall not extend more than 5" from the transformer tank.

c. The shield shall be designed to prevent accidental dislodgment.

2.8 LOW VOLTAGE TERMINATIONS

A. The low-voltage line and neutral terminals for all size transformers shall be a 1”-14 threaded copper stud. (Fig. 4c of ANSI C57.12.25, latest revision.)

a. Low voltage bushings to be Central Maloney part number 70133452 or approved equal by KEYS

b. Low voltage bushings shall have adequate strength to support the cables and prevent oil leaks.

Note: No exception will be taken on LV terminal stud sizing. KEYS will be utilizing CMC Lugs’ NSM750-8I stud connector for single phase pad mounts.

B. The neutral stud shall be furnished with one jam nut suitable for retaining the tank ground strap between the nut and a secondary connector.

C. The neutral bushing shall be insulated from the tank and provided with a detachable ground strap adequate to conduct maximum available fault current.

2.9 BREAK SWITCH

A. Each transformer shall include a 4-position load break switch.

a. Shall be a rotary “T-blade” type

b. Shall be externally operated for loop feed switching.

c. A spring loaded, quick make and break system shall be utilized and be hot stick operable.

d. This oil-immersed mechanism will be rated as follows:

i. 95 kV BIL

ii. Maximum Voltage L-L 25kV, L-Gnd 15kV

iii. Continued interrupt current – 300A

iv. Momentary and making current – 12kA

v. R.M.S. SYM/ASSYM. – 16kA

e. The four-position switch will provide for:

i. Loop A Feed

ii. Loop B Feed

iii. Loop A and B Feed and Transformer

iv. Transformer off – Loop closed

2.10 OIL PRESERVATION

and provides external indication of internal transformer faults, and also incorporates pressure relief functionality. The approved device is manufactured by IFD Corporation or approved equal.

b. Device shall provide external indication visible from the ground after an internal fault has occurred.

c. This device will function as replacement for the conventional pressure relief device.

2.11 NAMEPLATE INFORMATION

A. All transformer nameplates shall be mounted in such a manner that there are no sharp edges exposed, made of stainless steel 304/304L (preferred), and indicate the following per IEEE C57.12.00, latest revision:

a. The metal (aluminum or copper) used in each winding shall be shown on the nameplate.

b. kVA, High voltage, and low voltage.

c. BIL rating of high voltage winding (both high voltage BIL rating on dual voltage transformers).

d. Transformer weight.

e. Month and year of manufacture.

f. Serial number.

g. Bar-code in accordance with IEEE C57.12.35, latest revision.

h. PCB Content.

i. % Impedance

2.12 PAD MOUNTY TRANSFORMER SAFETY LABELS

A. No markings, signs, or safety labels are permitted on the exterior surface of the transformer unless otherwise specified.

B. A NEMA 260 - "Mr. Ouch" danger label is required on the inside surface of the compartment door and shall be clearly visible and readable when the transformer compartment door is in the open position.

2.13 WARRANTY

Each transformer conforming to this material specification shall be unconditionally guaranteed against failure due to any cause, except misapplication or abuse, for a minimum of one (1) year from the date of installation or 18 months from the date of shipment, whichever occurs first. Any transformer, which does not conform to this warranty, shall, at buyer’s option, be repaired or replaced by seller. Seller shall indemnify buyer for all costs incurred as a result of any such nonconformity.

2.14 PACKING AND SHIPPING

B. Copies of installation instructions shall be delivered to KEYS.

C. Each transformer shall be banded to a two-way entry, pallet.

D. The pallet must be of such dimensions as to provide two inch (2") clearance of the transformer at its widest outside measurements on all four sides.

E. All transformers shall be positioned on pallets allowing decal to be visible from the front of the pallet.

F. The pallet must provide a minimum of 2-1/2" of fork under clearance.

G. The transformer shall be banded to the pallet in such a way as to prevent shifting of the unit on the pallet surface during transit, while allowing the unit to be handled by sling or by fork truck without removing the banding.

H. Notification on delivery must be made no less than 48 hours prior to delivery by contacting KEYS Warehouse at (305) 295-1192 or (305) 295-1212 or emailing purchasing@keysenergy.com.

I. Deliveries must be made Monday through Friday between the hours of 7:30am and 3:30pm except for holidays. KEYS does not allow overnight parking of freight trucks on its property.

J. Unless otherwise specified at the time of purchase, transformers shall be shipped on open-

3.0 THREE PHASE, DEAD FRONT PAD MOUNT TRANSFORMERS

All transformers will be installed on KEYS 13,800 nominal voltage distribution system. KEYS voltage is 13,800 volts phase to phase and 7,970 volts phase to ground. All transformers supplied shall be capable of operating on this voltage system. This section covers three-phase pad mounted, 60 Hertz, mineral oil filled, self-cooled transformers.

of the following:

B. IEEE C57.12.26, latest revision, Requirements for pad mounted compartmental-type, self-cooled, three phase distribution transformers for use with separable insulated high voltage connectors; high-voltage, 13,800 volts and below; 2500 KVA and smaller.

C. IEEE C57.12.90, latest revision, Standard Test Code for Liquid-Immersed Distribution, Power, and Regulating Transformers

D. IEEE C57.91, latest revision Guide for Loading Mineral Oil-Immersed Overhead Type Distribution Transformers, Section 8.3

E. 10 CFR Part 431, Energy Conservation Program for Commercial Equipment: Distribution Transformers Energy Conservation Standards, Final Rule.

3.1 RATINGS

A. Typical KVA ratings are as follows: 45, 75, 112.5, 150, 225, 300, 500, and 750, 1000.

B. Transformers must have a five-legged core and coil.

C. Case temperature rise over ambient shall not exceed 45 degree C.

3.2 NOISE LEVEL

3.3 DIELECTRIC FLUID

a. Shall use Mineral Oil (Standard ASTM D3487) or biodegradable coolant.

B. General requirements

a. PCB content of less than two (2) ppm on a dry weight basis when tested in accordance with an EPA approved method.

b. An oil sight gauge, Tedco Nol M36E, or approved equivalent, shall be provided in three phase units.

i. It shall be located ½” to 1” below the surface of the 25-degree C oil level.

Note: Any transformer which is not in compliance with this requirement will be returned to the manufacturer for replacement.

C. Label requirements

a. All transformers shall have an approved durable label (Uticom U6060 or U6060B or exact equivalent).

b. Background color

i. Shall be a medium blue background.

c. Lettering size and color

i. Shall be a minimum 2” white lettering

d. Contents

i. Shall describe the dielectric fluid as non-PCB.

ii. Shall state its maximum PCB concentration at the time of manufacture.

e. Location on transformer

i. Shall be placed on the outside at a location to be easily read from the ground.

3.4 EXTERIOR FINISH

A. Color requirements

a. Shall be Munsell number 7GY 3.29/1.5.

B. Tank and cabinet material requirements

a. Shall be made of 304/304L stainless steel.

C. Coat and finish requirements

a. All paint and/or coatings including topcoats, intermediate coats and primers shall be free of lead.

b. Shall have a corrosion resistant finish that shall meet or exceed ANSI C57.12.28, latest revision.

c. Shall consist of sufficient coat(s) of high grade quality paint which will not fade, blister or chalk and will be scuff resistant.

Note: This is to insure long field life (20 years plus) with minimum maintenance under severe environmental conditions such as salt spray, high humidity and high ultraviolet levels.

a. There shall be no additional markings, signs or decals unless specified.

3.5 CONSTRUCTION

A. General requirements

USA.

b. Opening between tank wall and front sill flange shall be a minimum of 15-1/2”.

c. Shall be designed to minimize area where water and corrosive elements can accumulate.

d. Shall be designed to be lifted or slid on to a pad without disturbing entrance cables.

e. Enclosure security requirements as stated in ANSI C57.12.28, Latest Rev.

(repeated information may be listed in other categories for reiteration) A compartment shall be affixed on one side of the transformer:

i. Compartment depth shall be 18” deep at a minimum.

ii. Primary bushings shall be on the left side.

iii. Secondary bushings shall be on the right side.

iv. Secondary bushings shall be staggered.

v. There shall be a barrier in between the bushing sections such that:

1. Shall be 16” deep at minimum.

2. Shall extend 6” above and below the top most and lowest most secondary bushing from the centerline.

f. Secondary cabinet shall be 25” in width (barrier to side wall) at a minimum.

g. Transformer sizing, clearances, and arrangements shall follow Figures 6A, 7 & 8

IEEE C57.12.26, latest revision.

(Remainder of this page left blank)

B. Material requirements

a. BASE BID

i. All metal shall be 304/304L stainless steel where possible unless specified herein:

1. Nameplate

2. Exposed hardware (e.g. screws, brackets, etc…)

1. Sill, hood, and operating mechanisms

2. Faceplate hardware (including parking stand)

3. Sill hold down cleats

4. Hinges (including pins)

5. Lifting bolts

ii. Exceptions to stainless

1. Ground connector (See grounding in section 3.5 for detail)

b. Aluminum hardware shall not be used.

C. Welding requirements

a. Exterior welds shall be full welds.

b. Spot, tack, or skip welds are not acceptable for attaching hinges, brackets, grounding bosses, etc.

c. Hinges shall be continuously welded to the tank and lid.

D. Tank securement

a. Two (2) sill hold down cleats shall be provided and support ½” stainless steel mounting bolts with a slotted hole.

b. Compartment sill shall be mounted utilizing a minimum of two (2) 3/8” bolts on each side of the compartment.

E. Door requirements

a. Doors and top-hinged lids shall be designed to prevent inadvertent dislodgment from the hinge.

b. Door latch shall operate such that it avoids all primary and secondary connectors and cables.

c. When an externally replaceable fuse is used, the lid and doors must be designed so as not to interfere with replacement of this fuse

d. All door types shall have provisions for a ½” penta head captive bolt with NC Class 2 threading as stated in ANSI C57.12.28, Latest Rev for enclosure security.

e. Latch shall support a Best Co. #5B620 padlock or equivalent.

f. Penta head bolt shall be unable to be removed prior to padlock removal for security.

g. Hinge gauge shall be the same or greater than the gauge of the door.

F. Lifting provision requirements

a. Shall be permanently attached and arranged on the tank to provide a distributed balanced lift in a vertical direction for the completely assembled transformer.

b. Shall be designed to provide a safety factor of 5.

Note: The safety of 5 is the ratio of the ultimate stress of the materials used to the working stress. The working stress is the maximum combined stress developed in the lifting provisions by the static load on the completely assembled transformer.

G. Pressure requirements

a. Minimum sealed tank pressure capability without permanent distortion shall be 7

PSI.

b. Minimum sealed tank withstand pressure shall be 15 PSI.

i. At the minimum tank withstand pressure, no oil leak shall be initiated and no component or bushing shall be expelled from the unit.

c. If there is deformation, the unit shall remain tamper-proof and it shall be possible to open the compartment for access to the cable terminations.

d. The product of the minimum tank withstand pressure in PSIG (without a pressure relief device in place) and the cubic inches of air space above the transformer 140o C. oil level shall equal or exceed 16,500.

H. Cooling requirements

a. It is KEYS preference to have tanks without cooling fins.

i. If design requires cooling fins, they shall be no point or edge that is sharp including the attachment to the tank.

ii. Fins must be designed to minimum possible protrusion from tank.

I. Protection requirements

a. A ½” – 1” drain plug shall be provided near the center of the tank.

b. Drain plug shall follow all ANSI/IEEE standards for placement to avoid inaccessible locations.

J. Grounding requirements

a. Transformer shall consist of 2 ground pads

i. ½”-13 threaded boss, 7/16” deep

b. Shall contain a bronze type tank ground connector that supports up to a #6 to 250MCM copper conductor, Penn Union GSE-025 or equivalent. Must be approved by KEYS prior to bid acceptance if choosing an equivalent.

3.6 HIGH VOLTAGE TERMINATIONS

A. All transformers shall have four 2-1/2% full capacity taps, three below and one above rated voltage as shown below:

Tap % Voltage

1(a) 102.5% 8169V 2(b) 100.0% 7970V 3(c) 97.5% 7771V 4(d) 95.0% 7572V 5(e) 92.5% 7372V

B. The transformer shall be furnished with the required high-voltage removeable stud bushing wells, Elastimold K1601PC-S2-R or approved equal, for use with replaceable 200-amp, 15 kV load break type-bushing inserts per IEEE 386. Bail tabs or holes are required on the bushing well clamp. Specific written approval is required for use on wells other than the one specified (Bidder shall provide documentation for comparison). Bushing inserts will be furnished and installed by the vendor (Elastimold or Equal).

C. A bracket for ground or test bushing shall be located as shown on Figure 6A IEEE C57.12.26, latest revision.

D. The bushing wells shall be orientated so that the elbows can be operated with a hot stick.

E. Primary bushing wells shall have a dust cover in place for shipment.

3.7 HIGH VOLTAGE PROTECTION DEVICES

A. Fuse requirements

a. The primary fuse shall be externally replaceable equivalent to expulsion, bayonet type.

b. The fuse links will be load sensing in series with coordinated isolation links.

c. The fuse holder shall be located so the eye will not touch the lid in any position.

Note: Stops to prevent rotation of the eye to the twelve o'clock position are not acceptable.

Bayonet type fuses required for pad mount transformers:

Size (KVA) Phase Type

75 3 C06 150 3 C08 300 3 C10 500 3 C12 750 3 C14 1000 3 C14

B. Isolation link

a. If provided, then the link shall be in series with the bayonet oil fuse cutout.

b. Shall be sized to melt when the cutout rating is exceeded.

c. This link will be designed to operate at high fault conditions only.

(Optional - not required by KEYS unless an IEEE or ANSI requirement).

C. Drip shield requirements

a. Shall be provided under the bayonet fuse.

b. Shall not extend more than 5" from the transformer tank.

c. The shield shall be designed to prevent accidental dislodgment.

3.8 LOW VOLTAGE TERMINATIONS

A. Low voltage bushings to be Central Maloney part number 70133452 or approved equal by

KEYS

a. Low voltage bushings shall have adequate strength to support the cables and prevent oil leaks.

B. The neutral bushing shall be insulated from the tank and provided with a detachable ground strap adequate to conduct maximum available fault current.

C. Primary wye connections and secondary neutrals shall be internally connected to this tank ground with a HO switch to isolate the primary wye and secondary neutrals.

D. All 3-phase transformers shall come with spade terminals and located as in IEEE

C57.12.26, latest revision:

Size Spade Size Minimum Spade Thickness

45-150 kVA 10 hole spade (5 above, 5 below) 3/8”

225-500kVA 12 hole spade (6 above, 6 below) 3/8” 750kVA 12 hole spade (6 above, 6 below) ½” 1000kVA 12 hole spade (6 above, 6 below) ½”

3.9 BREAK SWITCH

A. Each transformer shall include a 4-position load break switch.

a. Shall be a rotary “T-blade” type

b. Shall be externally operated for loop feed switching.

c. A spring loaded, quick make and break system shall be utilized and be hot stick operable.

d. This oil-immersed mechanism will be rated as follows:

i. 95 kV BIL

ii. Maximum Voltage L-L 25kV, L-Gnd 15kV

iii. Continued interrupt current – 300A

iv. Momentary and making current – 12kA

v. R.M.S. SYM/ASSYM. – 16kA

e. The four-position switch will provide for:

i. Loop A Feed

ii. Loop B Feed

iii. Loop A and B Feed and Transformer

iv. Transformer off – Loop closed

3.10 OIL PRESERVATION

and provides external indication of internal transformer faults, and also incorporates pressure relief functionality. The approved device is manufactured by IFD Corporation or approved equal.

b. Device shall provide external indication visible from the ground after an internal fault has occurred.

c. This device will function as replacement for the conventional PRV.

3.11 NAMEPLATE INFORMATION

A. All transformer nameplates shall be mounted in such a manner that there are no sharp edges exposed, made of stainless steel 304/304L (preferred), and indicate the following per IEEE C57.12.00, latest revision:

a. The metal (aluminum or copper) used in each winding shall be shown on the nameplate.

b. kVA, High voltage, and low voltage.

c. BIL rating of high voltage winding (both high voltage BIL rating on dual voltage transformers).

d. Transformer weight.

e. Month and year of manufacture.

f. Serial number.

g. Bar-code in accordance with IEEE C57.12.35, latest revision.

h. PCB Content.

i. % Impedance.

3.12 PAD MOUNTED TRANSFORMER SAFETY LABELS

A. No markings, signs, or safety labels are permitted on the exterior surface of the transformer unless otherwise specified.

B. A NEMA 260 - "Mr. Ouch" danger label is required on the inside surface of the compartment door and shall be clearly visible and readable when the transformer compartment door is in the open position.

3.13 WARRANTY

Each transformer conforming to this material specification shall be unconditionally guaranteed against failure due to any cause, except misapplication or abuse, for a minimum of one (1) year from the date of installation or 18 months from the date of shipment, whichever occurs first. Any transformer, which does not conform to this warranty, shall, at buyer’s option, be repaired or replaced by seller. Seller shall indemnify buyer for all costs incurred as a result of any such nonconformity.

3.14 PACKING AND SHIPPING

B. Copies of installation instructions shall be delivered to KEYS.

C. Each transformer shall be banded to a two-way entry, pallet.

D. The pallet must be of such dimensions as to provide two inch (2") clearance of the transformer at its widest outside measurements on all four sides.

E. All transformers shall…