EXHIBIT_A_FKEC_Single_PHASE_polemount_SPEC__Rev_7_11-25-2024.pdf

FLORIDA KEYS ELECTRIC COOPERATIVE ASSOCIATION, INC.

Material Specification

Single-Phase Pole Mounted

DISTRIBUTION TRANSFORMERS

11-25-2024 Revision 7

Single-Phase Pole Mounted DISTRIBUTION TRANSFORMERS Revision 7

Record of Revisions

Rev # Reason Preparer Approver Date 5 a. Added Record of Revision page

b. Updated Section 10 & 11 to add requirement of animal guards to primary bushings and arresters.

c. Formatting changes

Andrew Fahrenkrug

Peter Amendola

08/17/2023

6 Update accessories to include static ring on the high voltage bushing. Added Section 10.04

Andrew Fahrenkrug

Peter Amendola

10/15/2024

7 Included 120/208 Transformer Andrew Fahrenkrug

Peter Amendola

11/25/2024

*Record of revision page not maintained for Rev 1-4

1.00 SCOPE

1.01 This Florida Keys Electric Cooperative (FKEC) Material Specification covers the electrical, mechanical and dimensional characteristics of single phase, 60-Hz, self-cooled, mineral oil-immersed, pole mounted distribution transformers.

1.02 All characteristics, definitions and terminology except as designated by this specification shall be in accordance with the latest revision of IEEE C57, and all specifications therein referenced.

2.00 RELATED STANDARDS

2.01 The following standards are referenced by this specification:

ANSI C57

ASTM D 4059

IEEE C57

2.02 All ANSI, IEEE, and ASTM standards referenced by this specification are latest revision unless otherwise noted.

3.00 RATINGS

3.01 The high-voltage rating shall be applicable for use on 24940 volts Wye/14400 volts (nominal).

3.02 The low-voltage rating shall be either of the following as specified in the order

3.02.01 120/240 volt, 3 bushing

OR

3.02.02 120/208volt, 2 bushing (May have third bushing if one tagged as dead)

4.00 BASIC IMPULSE INSULATION LEVEL

4.01 The high-voltage insulation shall have a basic impulse insulation level (BIL) of 125 kV and shall be of the 25 kV insulation class.

4.02 The low-voltage insulation shall have a BIL of 30 kV and shall be of the 1.2 kV insulation class.

5.00 IMPEDANCE

5.01 The design (and actual tested/recorded) impedance shall be within industry guidelines based on size of the transformer, unless otherwise specified by

FKEC.

6.00 TESTING

6.01 Routine tests on all transformers shall be performed as specified by IEEE C57.

6.02 Certified test reports (CTRs) shall be provided electronically (within 30 days of shipment) by a means agreeable to FKEC and the manufacturer. The report shall be submitted to the Director of Engineering. This report shall include the following data for each transformer:

Manufacturer's Name Serial Number Date of Shipment Percent Excitation Current FKEC Part Number FKEC Purchase Order

Number

Test Date Percent Impedance Excitation Losses - quoted and actual, corrected to 85°C Load Losses - quoted and actual, corrected to 85°C

6.03 Typical values of resistance and reactance for each kVA size covered by this specification shall be supplied to FKEC, at the time of quotation.

6.04 The manufacturer shall supply certified test reports to verify that each size passed impulse tests at rated BIL

7.00 AUDIBLE SOUND LEVEL

7.01 The average audible sound level of the transformer shall be within the guidelines established in accordance with IEEE C57.

8.00 CONSTRUCTION

8.01 Construction shall be as defined in IEEE C57 unless otherwise specified.

8.02 The entire transformer tank be constructed of series 304L stainless steel.

The appropriate stainless steel weld rods shall be used for all welds. The manufacturer shall provide certification of the stainless steel with each order.

8.03 The lifting provisions shall be designed for utilization as tie-down brackets and vertical lifting.

8.04 Lifting provisions shall be designed to allow lifting the transformers vertically with slings and without spreader bars and cause no damage to the tank cover or bushings.

8.05 Tank grounding provisions shall be in accordance with IEEE C57.

8.06 The insulating fluid used in the transformer shall be certified to contain less than 2 parts per million (ppm), by weight of polychlorinated biphenyls (PCB), when tested in accordance with ASTM D 4059. The certification shall be available to FKEC upon request.

9.00 TEMPERATURE RISE LIMITS

9.01 The winding temperature rise above ambient shall not exceed 65 degree C when tested in accordance with the guidelines.

9.02 The hot spot temperature rise above ambient temperature shall not exceed

80 degree C when tested in accordance with the guidelines.

10.00 ACCESSORY EQUIPMENT

10.01 All transformers shall have pressure relief provisions. Each transformer shall be equipped with a non-resettable device which detects and provides external indication of internal transformer faults (IFD).

10.02 External MOV-type secondary surge arrestors shall be provided on all transformers covered by this specification.

10.03 External primary arresters shall be mounted on all transformers.

10.03.01 The arrester must be Distribution Riser class, silicone polymer, 21kV Duty Cycle, 17kV MCOV, and minimum leakage distance of 30 inches.

10.03.02 An arrester grounding strap shall be installed on the lower both of the arrester mounting bracket. The grounding strap shall be of sufficient length and flexibility to allow the surge arrester isolator to operate properly.

10.03.03 The arrester shall be equipped with animal guard caps.

10.04 High Voltage bushing shall include a static ring

11.00 BUSHINGS AND TERMINALS

11.01 High-Voltage Bushings

11.01.01 Transformers will have a single primary bushing appropriately rated for the voltage class application, with a minimum creep distance of 30 inches. Primary connection point shall be tin plated, eye bolt type able to accommodate copper or aluminum conductor.

11.01.02 High voltage bushings shall be equipped with animal guards.

11.02 Low-Voltage Terminals

11.02.01 Transformers will have 3 secondary bushings with eye-bolt type terminals.

12.00 MARKINGS

12.01 Transformers shall be provided with a "NON-PCB" sign mounted on the transformer tank.

12.02 The FKEC stock number shall be permanently labeled in numerals not less than 2 ½ inches on the transformer tank. The stock numbers for transformers covered by this specification are specified on the bid document.

12.03 A bar code label shall be easily accessible on the transformer tank or mounting bracket.

13.00 NAMEPLATE

13.01 The nameplate and the information thereon shall meet all the requirements specified in ANSI/IEEE C57. The month and year of the date of manufacture shall be stamped on the nameplate.

13.02 The nameplate shall state the PCB level of the insulating fluid in parts per million (ppm) by weight.

13.03 The nameplate shall specify that the tank is constructed of stainless steel and shall state the grade of stainless steel used.

13.04 The nameplate shall be bar coded with the following information (at a minimum), manufacturer’s name, serial number, manufactured date, percent impedance, rated kVA and FKEC stock number.

14.00 PACKAGING AND SHIPPING

14.01 All transformers shall be shipped on and strapped to a pallet of sufficient strength to support the weight of the unit. The pallet shall extend a minimum of 2 inches beyond any protruding portion of the transformer including the cooling radiators. The transformer and pallet shall be shipped such that no transformer supports another transformer and pallet.

14.02 The manufacturer is responsible for packaging all products in a fashion that will provide protection during the course of normal shipping and handling procedures. All hidden damage is the sole responsibility of manufacturer.

14.03 Seven days advance notice is required on shipments of transformers weighing in excess of 7,000 pounds.

14.04 All transformers must be shipped for side unloading. Transformers not shipped for side unloading may be returned or, if accepted, the manufacturer will be billed for the cost of unloading the transformers.

15.00 APPROVAL

15.01 Approval drawings must be submitted to the Engineering Department on any transformer covered by these specifications.

16.0 TRANSFORMER LOSS EVALUATION FACTORS

16.01 FKEC has established up to date transformer loss evaluation factors and will be using total ownership cost as a portion of the overall evaluation criteria for this request. Please refer to the bid document for the A and B factors. Manufacturers will be required to provide certified test results on each transformer provided using the temperature of 85°C. The certified losses must be lower than or match the quoted losses (within the established IEEE allowable variance) on average, for the entire lot of transformers provided per the request. If the average losses for the entire lot do not meet the criteria, FKEC may remove the manufacturer from the request process in the future.

17.00 DEVIATIONS FROM THIS SPECIFICATION

17.01 The supplier is required to supply a letter from the manufacturer stating compliance with this specification. This letter is to be furnished on the manufacturer's letterhead and addressed as described in 17.04 of this specification. Florida Keys Electric Cooperative must receive the letter prior to the supplier submitting his first bid after the issuance of the new or revised specification.

17.02 Should the supplier wish to take exception to any aspect of this specification, they shall provide written documentation describing the variance(s) and the reason for the variance(s) to the specification.

Written approval of any variances to the specification must be obtained from the Director of Engineering, prior to the supplier submitting his bid.

17.03 Failure to comply with this specification may cause the removal of the supplier from the approved list, return of material received not meeting this specification, and cancellation of the material ordered under this specification.

17.04 Written correspondence covering this specification shall be sent to:

Director of Engineering Florida Keys Electric Cooperative, Inc.

91630 Overseas Hwy.

Tavernier, FL 33070