RFI_1100_BAS6001_TECH_DOC_1_v1.pdf

Specification E-649-15JUL25

CITY OF AUSTIN ELECTRIC UTILITY DEPARTMENT

PURCHASE SPECIFICATION FOR

TRANSFORMER, DIST, URD, 3PH, 75-2500KVA, 15KV

DATE

PREPARED BY

ISSUANCE/REVISION

APPROVAL

PROCESS SUPV. / MATERIALS SUPV.

6/25/81 Richard Dreiss Revision Richard Dreiss 2/25/86 Robin Kittel Revision Richard Dreiss 2/1/90 Tony Sheiki Revision Richard Dreiss 3/27/91 George Martinez Revision Richard Dreiss 5/29/92 Steve Booher Revision Richard Dreiss 3/29/94 Peter Soosay Revision Gary Williams/Peter Soosay 4/20/95 Peter Soosay Revision Richard Dreiss/Peter Soosay 2/20/96 Steve Booher Revision Richard Dreiss/Peter Soosay 3/18/97 Bill Germany Revision Carl Lynch/Peter Soosay 11/7/97 Peter G. Soosay Revision Peter Soosay 2/25/98 Peter G. Soosay, Revision Matt Monroe/Herman Millican 4/8/98 Peter G. Soosay, Revision Matt Monroe/Herman Millican 8/31/98 Peter G. Soosay Revision Peter Soosay 8/13/01 Carl A. Nance Revision Carl A. Nance 01/30/04 Steven Booher Revision Leonard Hough 02/26/04 Steven Booher Revision Leonard Hough 04/27/05 Dennis Patrick Revision Leonard Hough 04/26/06 Ted Schoenberg Revision Ted Schoenberg 04/05/06 Steve Booher Revision Ted Schoenberg 02/10/09 Steve Booher Revision Greg Troxell 02/10/14 Troy Vessel Revision Troy Vessel 09/11/14 Brantley Gosey Revision Troy Vessel 03/26/15 Daniel McReynolds Revision Michael Pittman 08/03/15 Dennis Patrick Revision Michael Pittman 11/17/15 Dennis Patrick Revision Michael Pittman 12/28/17 Obaid Rehman Revision Michael Pittman 04/02/18 Obaid Rehman Revision Michael Pittman 05/09/18 Obaid Rehman Revision Michael Pittman 09/23/24 Julius Heslop Revision Julius Heslop 10/15/24 Brantley Gosey Revision Josh Contreras 07/15/25 Brantley Gosey Revision Josh Contreras 1/7/25 Josh Contreras Revision Josh Contreras

REASON FOR REVISION AFFECTED PARAGRAPHS

Update for New Request For Bids All 04/27/05: Added Fusing For Radial Feed Transformers. 3.1 04/27/05: Added Warranty Requirements. 0400 04/27/05: Changed Sticker Requirements Attachment IV, IVa 04/05/06: Format Revision & updated Fusing & Switch All 08/05/08: Update for new request for Bids All 02/10/09 : Add requirement low voltage terminals 3.2 02/10/14: Add requirements for low voltage terminals/ DOE 2016 requirements/Transformer Losses fees 3.2, 6.2, 6.35, 6.36, 6.43b

09/11/14: Update Cooper ELSP fuse part numbers 3.1 03/26/15: Terminology update, standard listing update, LV spade supports, Tank updates, Door updates, Paint updates, DOE 2016 updates, audit program.

1.1, 2.11, 3.2, 5.3, 5.4, 5.5, 5.6, 6.2, 6.4.1

08/03/15: Added Secondary Decal Attachment IV, IVA, IVB 11/17/15: Added IFD requirement 3.6.7 12/28/17: Added Low Voltage Side Doors Requirement 5.5 04/02/18 Changed Dielectric Fluid 5.4

Specification E-649-15JUL25

This specification, until rescinded, shall apply to each future purchase and contract for the commodity described herein.

Retain for future reference.

05/09/18: Added Mineral Oil Requirements 5.4 09/23/24: Provision for 1000KVA 208Y/120V, Add manufacturers 3.4, Attachment 1 10/15/24: Provision for allowing AE personnel the ability to drill holes for metering, and other minor clarifications to allow (Nitrile, bolt-on hinges, and non-removable tank base 5.3, 5.5, 5.9

07/15/25: add option to include paint or decal 3.6.5 1/7/2026: Replaced C57.12.26 as the normative reference with C57.12.34-2022 throughout the document, and updated Figure references. Added missing number in the Solid Link part # and updated the fuse link and ELSP #s to match the latest manufacturer recommendations in the 3.1 Fusing section. Added the requirement for a one-piece metal oil-drip shield to clarify that three individual drip guards is not acceptable. Added the vector group designation Dyn11 in 3.6.5 and 3.6.6. Added Section 3.7 to require the ANSI Type 1 transformer profile. Clarified the advantages of using Viton or Nitrile in for gaskets by giving an operation rating in Section 5.3. Specified that Type II mineral oil is required in

5.4. Clarified the pad-lock requirement for the primary compartment. Added Section 5.10 to include a weight limit of 16,000 pounds. Updated Sections 6.1 and 6.2 to clarify the difference between routine and design testing requirements, and updated the 6.4 Section name to clarify its purpose. Updated Attachment IV to communicate decal requirements and to show the placement of these external and internal (new) decals. Updated Attachment V to include required formatting when submitting test reports.

2.0, 2.2, 2.10, 3.1, 3.6.4, 3.6.5, 3.6.6, 3.7, 5.3, 5.4, 5.5, 5.10, 6.1, 6.2, Attachment IV-A, Attachment IV-B, Specification E-649

15JUL25

1.0 SCOPE AND CLASSIFICATION

1.1 Scope

This specification describes the minimum acceptable requirements for 3-phase, pad-mounted, 60-Hertz, ∆-Υ Grd.

connected, self-cooled, compartmental type, dead front distribution transformers, rated 75 kVA through 2500 kVA.

The transformers supplied under this specification are intended for use on concrete slabs and shall be designed for serving underground distribution electrical facilities.

The City of Austin Electric Utility Department is hereinafter referred to as Austin Energy (AE).

1.2 Classification

Any item supplied under these specifications, but not in complete compliance with these specifications, shall be subject to rejection.

All manufacturers furnishing transformers under these specifications shall have at least five years of experience in the manufacture and sale of 3-phase- pad-mounted distribution transformers.

2.0 APPLICABLE SPECIFICATIONS

Transformers shall comply with applicable provisions of the latest IEEE, ANSI, and NEMA standards. Where relevant, materials and construction shall meet ASTM standards. Installation and safety clearances shall conform to NEC and NESC, as applicable. In case of conflict between any of the standards mentioned in this specification and the contents of this document, the AE specification shall govern. All characteristics, definitions and terminology, except that specifically covered in this specification shall be in accordance with the latest revisions of the following standards:

2.1 C57.12.00

General Requirements for Liquid-Immersed Distribution, Power and Regulating Transformers

2.2 C57.12.34

IEEE Standard for Requirements for Pad-Mounted, Compartmental-Type, Self-Cooled, Three-Phase Distribution Transformers, 5MVA and Smaller; High Voltage, 34.5kV Nominal System Voltage and Below; Low Voltage, 15kV Nominal System Voltage and Below

2.3 C57.12.28

Switchgear and Transformers - Pad-Mounted Equipment - Enclosure Integrity

2.4 C57.12.70

Terminal Markings and Connections for Distribution Power Transformers

2.5 C57.12.80

Standard Terminology for Power and Distribution Transformers

2.6 C57.12.90

Standard Test Code for Liquid-Immersed Distribution, Power, and Regulating Transformers and Guide for Short- Circuit Testing of Distribution and Power Transformers.

2.7 C57.91

IEEE Guide for Loading Mineral-Oil-Immersed Transformers and Step-Voltage Regulators

2.8 NEMA TR-1

Transformers, Regulators and Reactors

2.10 Department of Energy’s Energy Conservation Standards for Distribution Transformers, as codified in 10 CFR Part 431, Subpart K, effective January 1, 2016, or the most current revision in effect at the time of manufacture.

3.0 FUNCTIONAL REQUIREMENTS

3.1 FUSING

75 kVA through 500 kVA transformers shall be equipped with Cooper Power System flapper sidewall-mount bayonet draw-out fuse holder assembly #4000361C99FV or AE Standards approved equivalent with dual sensing expulsion fuse or solid link in series with a partial-range, mineral oil immersed, current-limiting fuse as listed below.

750 kVA through 2500 kVA transformers shall be equipped with a Cooper Power Systems silver-plated bayonet draw-out fuse holder assembly #4038804B03M or AE Standards approved equivalent with high amp overload expulsion fuse or solid link in series with a partial-range, mineral oil immersed, current- limiting fuse as listed below.

Loop-Feed Both Radial Feed

KVA Cooper Fuse Link # Cooper ELSP # Cooper Solid Link #

75 4000358C05 CBUC15030C100 4038361C10CB

150 4000358C08 CBUC15080C100 4038361C10CB

225 4000358C10 CBUC15100C100 4038361C10CB

300 4000358C10 CBUC15100C100 4038361C10CB

500 4000358C12 CBUC15150D100 4038361C10CB

750 4038361C03CB CBUC15165D100 4038361C10CB

1000 4038361C03CB CBUC15165D100 4038361C10CB

1500 4038361C04CB CBUC15165D100 4038361C10CB

2000 4038361C05CB CBUC15125C100* 4038361C10CB

2500 4038361C05CB CBUC15125C100* 4038361C10CB

* Indicates parallel fuse application – use two (2) fuses

Bay-o-net type fuses shall be designed so that the fuses can be removed by using a hot stick. A one-piece metal oil-drip shield shall be furnished directly beneath the bay-o-net fuses. Lead connections to the partial-range current-limiting fuse shall be made using bolts, to assure solid electrical and mechanical connections.

3.2 BUSHINGS AND TERMINALS

The primary bushings and parking stands for radial-feed and loop-feed dead-front transformers shall be arranged as follows:

Radial-feed dead-front transformers shall be constructed according to IEEE C57.12.34, Figures 12 and 14. The transformer shall be provided with three high voltage bushing wells (IEEE 386), externally clamped, and three parking stands. The high-voltage leads shall be of such length as to permit field replacement of bushing wells.

Loop-feed dead-front transformers shall be constructed according to IEEE C57.12.34 Figures 12 and 16. The transformer shall be provided with six high voltage bushing wells (IEEE 386), externally clamped, and eight parking stands to permit operating the transformer in a looped primary system. The high-voltage leads shall be of such length as to permit field replacement of bushing wells.

All bushing wells shall have a removal stud for field replacement.

Low-voltage line and neutral terminals shall be in accordance with IEEE C57.12.34 Figure 8 (a) and 12.

All secondary terminals shall be tin-plated copper and shall follow IEEE C57.12.34, Figure 19, except that the number of holes in the terminals shall be as follows:

Transformer Spade Terminal 75 KVA and below 6-hole 150 KVA and above 10-hole

Ten-hole and larger spades shall be furnished with additional insulated support, at the end farthest from the tank wall, without interfering with the use of any of the ten holes (Attachment III).

LV spade termination support brackets shall be mounted across and above the LV spades from the Low Voltage sidewall and the HV/LV steel barrier along with a horizontal strut. Tank wall support mounting is not allowed.

The low-voltage neutral bushing shall be an insulated bushing with a removable external ground connection. The ground strap shall be adequate to carry the fault current based on the rating of the transformer.

3.3 INTERNAL BUSHING LEADS

High voltage bushing leads shall be trained and appropriately insulated to avoid dielectric breakdown between adjacent cables. Spacers, permanently held in place, should be used to prevent cables from failing phase-to-phase or phase-to-ground.

Low voltage bushing leads shall create good electrical and strong mechanical connections.

3.4 HIGH-VOLTAGE TAPS

All transformers (preferred continuous kVA ratings) shall be provided with high voltage taps as shown below:

Size of Taps above Low-Voltage Rating KVA Number of Taps and/or below Rated Voltage

208Y/120 V 75-500 4 2 ½% below 208Y/120 V 750, 1000 2 2 ½% above & below 480Y/277 V All 2 2 ½% above & below

The tap-changer handle shall be mounted for external operation and located in the high-voltage compartment.

3.5 SWITCHING

Loop-feed transformers: A 3-phase, gang-operated, four-position, under mineral oil load break switch shall be supplied on all loop-feed transformers. The switch shall have a minimum load break rating of 200 amps and a 3-shot make-and-latch rating of 10,000 amps, symmetrical. The connections to be made in each switching position are as follows:

POSITION SOURCE “A” SOURCE “B” TRANSFORMER COIL

1 – 12 o’clock OFF ON ON 2 – 3 o’clock ON ON OFF 3 – 6 o’clock ON ON ON 4 – 9 o’clock ON OFF ON

The switch positions shall be clearly marked as to whether the source or coil is on or off. The switch handle shall be in the high-voltage compartment. The switch shall be operable with a hook stick. The switch shall be a T-Blade Switch, Cooper Part # LS4BH3T12B or AE Standards approved equivalent.

Radial-feed transformers: A 3-phase, hook stick-operable, gang-operated, two-position, under-oil load break switch shall be supplied on all radial-feed transformers. The switch shall have a minimum load break rating of 200 amps and a make-and-latch rating of 10,000 amps rms, symmetrical, 15-cycle. The switch shall have an open/close indication plate. This switch shall be in the high-voltage compartment. The switch shall be Cooper Part # LS2B515H3S2B or AE Standards approved equivalent.

3.6 ACCESSORY EQUIPMENT

The following equipment and devices shall be provided on the size transformers indicated:

3.6.1. All transformers shall have an oil-drain valve, with sampling device, located in the high-voltage compartment. The valve shall be a gate valve, not less than ½".

3.6.2. All transformers sized 300 kVA or larger shall have a liquid-level gauge in the high-voltage compartment.

Units less than 300 kVA do not require a liquid-level gauge.

3.6.3. All transformers sized 300 kVA or larger shall have a temperature indicator in the high-voltage compartment. Units less than 300 kVA do not require a temperature indicator.

3.6.4. All transformers shall have a pressure-relief device located on the low-voltage side of the terminal compartment. The pressure relief for the transformer tank shall be as specified in IEEE Std. C57.12.39.

3.6.5. TERMINAL MARKING AND ANGULAR DISPLACEMENT

Terminal designations shall be as per IEEE C57.12.70. Terminals shall be clearly marked with oil-resistant yellow paint or decals.

The identification of terminal connections shall be shown on the nameplate.

The angular displacement between the high- and low-voltage terminals shall be as per Figure 21 of IEEE C57.12.34.

The transformer shall have a vector group designation of Dyn11, indicating a delta-connected primary and wye-grounded secondary with a 30° phase displacement.

3.6.6. NAMEPLATE

As described in IEEE C57.12.00, the contractor shall affix a durable metal nameplate to each transformer.

The nameplate shall be in the low-voltage compartment and shall be readable with the cables in place.

The nameplate shall be made from anodized aluminum or non-rust stainless steel. The information contained on the nameplates shall be inscribed and painted black.

The nameplate shall conform to IEEE C57.12.00: Nameplate B for 500 kVA and below and Nameplate C for 750 kVA and above. All information shall be in English and ft-pound-seconds (fps) non-metric units of measure.

The nameplate shall indicate the current-limiting fuse on a circuit diagram, and shall include the vector designation (e.g., Dyn11) and a diagram showing the angular displacement between windings, in accordance with IEEE C57.12.00 and IEEE C57.12.34.

The nameplate shall contain a permanent bar code that meets the following requirements:

Information: The bar code shall display the Manufacturer Identification Code (see Attachment I) and manufacturer’s serial number.

Durability: The bar code shall last the lifetime of the transformer, as specified by IEEE C57.12.00, regarding the nameplate. The bar code shall be constructed such that, when using a contact-type bar code reader, the bar code shall be capable of a minimum of thirty successful scans.

Dimensions: The height of the bar code shall be either 0.24 inches or 15% of the bar-code length (L);

whichever is greater (see Attachment II).

Character Size: The bar code print quality shall be in accordance with ANSI X3.182. The permanent bar code shall be of medium density, ranging from 4 to 6.9 characters per inch.

Bar Code Symbology: The bar code symbology shall be Code 39, also referred to as 3-of-9 bar code, using the 43-character ASCII set, in accordance with ANSI X3.4.

Orientation of the Bar Code Characters: The bar code characters shall be arranged in one line. A start character shall precede the manufacturer’s code and a stop character shall follow the transformer serial number (see Attachment II).

Quiet Zones: A minimum quite zone of 0.25" shall immediately precede and follow the bar codes.

Human-Readable Interpretation: A human-readable interpretation line shall be provided directly beneath the bar code, in accordance with ANSI MH10.8M. The interpretation of the 3-of-9 bar code shall be clearly identifiable with the bar-code symbol above. The preferred shapes of the human-readable interpretation shall conform to either ANSI X3.17 or ANSI X3.49. As an alternative, any human-readable font with characters no less than 3/32" in height is acceptable.

3.6.7 All transformers shall be equipped with a resettable device (which can be reset by trained personnel only) which detects and provides external indication of internal transformer faults and incorporates pressure relief functionality. The approved device is manufactured by IFD Corporation part number IFD-ORCA-10PSI-aA or approved equal.

3.7 Transformer Profile

All transformers shall be constructed in accordance with ANSI Type 1 profile requirements as defined in IEEE C57.12.26. Low-profile designs are not acceptable.

4.0 PERFORMANCE

4.1 INSULATION LEVEL

4.1.1. The high-voltage insulation shall be as follows:

Rated High Voltage (Volts) BIL (kV) Insulation Class (kV)

12470 ∆ 95 15

4.1.2. The low-voltage insulation level shall be as follows:

Low Voltage Rating (Volts) BIL (kV) Insulation Class (kV) 208Y/120 30 1.2 480Y/277 30 1.2

4.2 TEMPERATURE RISE LIMITS

The Temperature rise and loading conditions shall be in accordance with IEEE C57.12.00 section 5.11.

4.3 IMPEDANCE

The impedance voltage is the voltage required to circulate rated current through one of two specified windings of a transformer when the other winding is short-circuited, with the windings connected as for rated-voltage operation

(IEEE C57.12.80).

In accordance with IEEE C57.12.00, section 9.2, the allowable impedance-voltage tolerance for any individual transformer shall be as follows:

KVA Rating Impedance Voltage 75 - 500 2.0% ± 10.0% (1.8% to 2.2%) 750 - 2500 5.75% ± 7.5% (5.3% to 6.2%)

Any unit that is outside of the tolerance shown will be rejected. There is no additional tolerance allowed on these values.

5.0 MATERIAL

5.1 Core and Coil Construction

The transformer coils shall be designed to maintain the nameplate kVA rating throughout the temperature range. All materials used shall be of the 65ºC (85ºC Hot Spot) Class and shall be thoroughly tested for compatibility with all transformer components before use in the design. Only thermally upgraded, one hundred percent conduction, particle tested kraft paper shall be used for secondary layer insulation. Provisions shall be made for securing the sheet windings and the primary windings in position during construction and for short-circuit conditions. Insulating paper shall be thermally cured under pressure, epoxy coated, diamond pattern type.

The core shall be manufactured with burr-free, grain-oriented silicon steel. Amorphous core shall not be permitted.

5.2 Core-Coil Assembly

The core and coil, after assembly, shall be mounted in a rigid steel frame, constructed in such a way as to hold the coil in a rigid position within the core window without placing undue stress on the core or short circuiting the laminations at any point.

5.3 Tank

The transformer tank shall have high- and low-voltage cable terminating compartments. The transformer tank and compartment shall be of sufficient construction to conform to IEEE C57.12.28.

The tank shall be of sufficient strength to withstand an internal pressure of 7 psig without permanent distortion and 12 psig without permanent rupturing or displacing other components of the transformer or affecting cabinet security.

A one-inch pipe plug shall be provided, for filling, taking oil samples, and pressure testing. This plug shall be located in the lower left-hand corner of the high voltage compartment.

The tank cover may be either the bolted-on or welded-on type, as per IEEE C57.12.34. The welded-on cover shall have handhold(s) as per IEEE C57.12.34.

Tank grounding shall be as per IEEE C57.12.34.

All exterior nuts and bolts shall be of a corrosion-resistant material.

Most oil restraining welds shall be horizontal and preferably robotically applied to limit weld oil leak and corrosion incidence.

Coolers shall be rigidly welded to the tank wall and only horizontal welding is allowed. Vertical or downhill welding is not allowed when affixing cooler banks to tank sides.

Front bottom sill shall be removable to allow for maintenance replacement if needed.

The transformer tank shall be of rectangular shape and shall only have internal bracing for structural rigidity to prevent external corrosion, reduce external welding and improve paint coverage, with the exception of units with cooling radiators. External bracing is not allowed.

Tank base must allow for maintenance replacement if needed. Radiators shall be supported.

The transformer shall be of sealed-tank construction, which seals the interior of the tank from the atmosphere, and which insures constant gas volume and oil volume. The transformer shall remain effectively sealed for a top-oil temperature range of -5°C to 105°C.

All required gaskets shall be made of high temperature Viton or Nitrile, or an alternative elastomer submitted for review and approved by AE. Any proposed alternative must be rated for continuous operation at -40°C to +120°C (minimum) and demonstrate compatibility with mineral oil, low compression set, and resistance to aging and thermal cycling.

The Vendor shall place all labels required by AE Distribution Construction Standard #1099-14, and shown in Attachments IV, IV-A, and IV-B, on the cabinet doors of each transformer.

5.4 Dielectric Fluid

The dielectric fluid shall be a Type II mineral oil (UL approved), electrical insulating and cooling liquid.

The Dielectric Fluid supplied with all transformers shall be in accordance with IEEE C57.147 and be suitable for use in sealed transformer designs. The manufacturer shall provide batch test reports of the dielectric fluid characteristics to AE Distribution Standards.

The PCB content in the dielectric fluid shall be less than 1 ppm. The vendor shall provide written certification to the City that all dielectric fluid contains less than 1 ppm. The PCB content shall be shown on the nameplate of the transformer. A decal shall be placed on the transformer in accordance with Attachments IV and IV-B.

5.5 Doors

Only conventional vertical-hinged, two-door design is acceptable. Door shall have a recessed, captive penta-head bolt that secures all access to doors. Door hinges and pins shall be SST 304 and welded or bolt-on construction with minimum 3/8 inch, plus or minus 1/32 of an inch pin size. Maximum spacing from corners shall be 8 inches and max spacing from centerline to centerline of welded hinges or bolt-on hinges shall be 24 inches. Hinges shall be welded or bolt-on to cabinet side wall and door and shall permit easy door removal without damage to the cabinet and door paint when removing the door. All other designs, including clamshell and flip-top door designs, are not acceptable.

The high voltage compartment door shall have a 19/64" hole drilled in the upper left-hand corner 10" from the top and 10" from the left-hand side. This hole shall have a field removable plug so that the transformer will accommodate a fault indicator light. The plug shall be designed so that if the plug is not removed the integrity of the enclosure still complies with IEEE C57.12.34 and C57.12.28 requirements. See Attachment IV-B.

The high-voltage side door shall include two welded-on locking tabs with pre-drilled ½-inch holes. These tabs shall align with matching holes in the transformer enclosure flange, allowing a standard padlock to secure the primary compartment. This locking feature is intended to prevent access to the high-voltage side while customers are working on the low-voltage side. The design shall ensure proper alignment and clearance for padlock installation without interference with door operation or enclosure integrity.

5.6 Primer and Paint

All primer and paint shall be lead-free and rust resistant. The enclosure security and coating system shall be as per IEEE C57.12.28, as a minimum requirement. In addition to this IEEE standard, the unit shall be painted Munsell Green, number 7GY 3.29/1.5, with a minimum thickness of 5 mils.

5.7 HIGH-VOLTAGE AND LOW-VOLTAGE COMPARTMENTS

Doors on the high-voltage and low-voltage compartments shall be of sufficient size to provide adequate working space when opened.

With the low-voltage compartment door opened or removed, adequate safeguards shall isolate the high-voltage compartment. The high-voltage compartment shall be accessible only by releasing a penta-head bolt to allow the compartment door to be opened, or by some other equally secure method. If an insulating material is used for the barrier, it shall be supported or braced on all sides with metal strips.

The compartments shall have the following minimum dimensions:

KVA HV Compartment LV Compartment 75 - 2500 40.0” wide x 26.0” deep 30.0” wide x 26.0” deep

The opening on the bottom of all transformers shall have the following minimum dimensions:

KVA HV Compartment LV Compartment 75 - 2500 38.5” wide x 23.0” deep 28.5” wide x 23.0” deep

5.8 HANDLING AND MOUNTING FACILITIES

The lifting provision shall be in accordance with IEEE C57.12.34 Section 8.6.

The transformer base shall be arranged for rolling in two directions, parallel to and at right angles to the centerline of the high-voltage bushings.

The base of the assembly shall be provided with a suitable flange to permit anchoring the unit on the pad from within the cable-terminating compartments.

5.9 METERING AT TRANSFORMER APPLICABLE

The padmount transformer shall be designed to accommodate the future field mounting of sockets and associated metering equipment.

5.10 WEIGHT LIMIT

The total weight of the transformer, including all fluids and accessories, shall not exceed 16,000 pounds. This requirement ensures compatibility with handling infrastructure.

6.0 ROUTINE AND DESIGN TESTS

6.1 Routine Tests

The contractor shall perform the routine tests on each transformer, as specified in Section 8 of IEEE C57.12.00. All testing shall be performed as per IEEE C57.12.90. Routine tests shall include, but are not limited to:

• No-Load Loss

• Load Loss

• Excitation Current

• Impedance Voltage

• Applied Voltage Test

• Induced Voltage Test

• Polarity and Phase Relation

• Ratio Test

6.2 Design and Other Tests

The contractor shall perform the following design tests on a representative unit per transformer type, unless otherwise specified by AE:

• Lightning Impulse (BIL)

• Optional: Temperature Rise, Short-Circuit Withstand, or other tests as requested.

All testing shall be performed in accordance with IEEE C57.12.90 and certified by the manufacturer. Software analysis results may be submitted for preliminary design review but shall not be used as a substitute for physical testing.

6.3 REQUIRED INFORMATION

For each item, the Bidder shall supply the following information on the bid sheet:

6.3.1. Guaranteed No-Load Losses, in watts, corrected to 20°C: Those losses which are incident to the excitation of the transformer. They are the losses of the transformer excited at rated voltage and frequency but not supplying load. No-load losses are to be measured as per IEEE C57.12.90.

6.3.2. Guaranteed Load Losses, in watts, corrected to 85°C: Those losses which are incident to the carrying of a specified load. They are the losses of the transformer excited at rated voltage, frequency, and current.

Load losses are to be measured as per IEEE C57.12.90.

6.3.3. Guaranteed Total Losses, in watts: The sum of the No-Load and Load Losses.

6.3.4. Bid Amount, per individual transformer.

6.3.5. Adder for No-Load Losses, per individual transformer: This amount is equal to (Guaranteed No-Load

Losses, in watts) x ($6.461 per watt).

6.3.6. Adder for Load Losses, per individual transformer: This amount is equal to (Guaranteed Load Losses, in watts) x ($3.379 per watt).

6.3.7. Total Owning Cost per Individual Transformer: This amount is equal to the sum of the Bid Amount, the Adder for No-Load Losses, and the Adder for Load Losses.

6.3.8. Total Owning Cost for the Estimated Annual Usage: This amount is equal to (Total Owning Cost per Individual Transformer) x (Estimated Annual Usage).

6.4 ACCEPTANCE AND TEST REPORT REQUIREMENTS

6.4.1. Manufacturer’s Test Report

Prior to the delivery of a transformer, the vendor shall provide a manufacturer’s test report to the AE Distribution Standards Engineer. The test report shall contain the information as shown in Attachment V.

The test report shall be emailed to the AE Distribution Standards.

The vendor shall also ship a paper copy of the test report with each transformer delivery.

AE will review each manufacturer’s test report and will either reject any transformer that does not meet the requirements of this specification or pay a reduced price for the transformer, as calculated by the method in section 6.4.3 of this specification.

In addition to inspections and tests on incoming raw material, parts, sub-components and sub-assemblies, the manufacturer shall have a finished product quality audit program to assure a well-designed, safe, reliable and durable finished product. Records shall be kept to determine level of quality of products being manufactured and be made available to the Company upon request.

6.4.2. Incoming Inspection by AE

AE may test transformers at the point of delivery to verify and adjust, if necessary, the manufacturer’s test-report data. AE will use the verified or adjusted data to assure compliance with this specification and to perform the transformer loss evaluation.

6.4.3. Transformer Loss Evaluation

In accordance with IEEE C57.12.00, section 9.3, actual losses on each individual transformer shall not exceed the manufacturer’s guaranteed losses by more than the following percentages:

a) No-Load Losses............10%

b) Total Losses....................6%

Any individual transformer having actual losses that exceed these limits will be subject to the following:

a) An immediate fee of $350.00

b) Possible return of the transformer to the vendor, at the discretion of AE

Should AE elect to keep the transformer, a losses fee will be assessed on the individual transformer to offset the increased total owning cost of the high-loss transformer. The fee will be calculated according to the following formula:

Losses Fee = ($6.461/W)(Measured No-Load Losses - Guaranteed No Load Losses) + ($3.379/W)(Measured Load Losses - Guaranteed Load Losses)

6.4.4. Impedance Voltage Evaluation

Any individual transformer having a voltage impedance that does not fall within the acceptable range given in section 4.3 of this specification will not be accepted by AE and will be returned to the vendor at the vendor’s expense.

6.4.5 Any transformers not complying with Department of Energy efficiency ratings shall be rejected in accordance with section 6.2 of this specification.

ATTACHMENT I

MANUFACTURER IDENTIFICATION CODES

AB - ABB

CM - Central Moloney CP - Cooper DE - Daelim Electric ER - Ermco GE - General Electric HI - Howard Industries JH - Jiangsu Huapeng Transformer Co KU - Kuhlman

The Manufacturer Identification Codes suggested above represent, in part, codes that are utilized for bar coding distribution transformers. The above listing does not represent a complete list of distribution transformer manufacturers.

ATTACHMENT II

ORIENTATION OF BAR CODE CHARACTERS

QUIET * Mfg. Serial Number * QUIET

ZONE I.D. ZONE

Code

* Start/Stop Character

L

0.05L or 0.24”

23Sept24

ATTACHMENT III

TRANSFORMER SPADE SUPPORTS DRAWING

ATTACHMENT IV

TYPICAL SIGNAGE MATERIAL REQUIREMENTS OF 3-PHASE PADMOUNTED TRANSFORMERS

“NO PCBS” decal: 6” X 6” inch, blue. Base Film: 0.0035-inch cast polyvinyl chloride, with UV inhibitors as per MIL-M-22106A. Cyasorb UV-9 light absorber C14H1203. Gloss 80 UL 94 rated. Over lamination: 002PVF (polyvinylflouride) tedlar UV screening film from E.I.

Dupont. Cold-seal bonded. Adhesive: 0.002-inch permanent acrylic hi-tack, with high-temperature-resistant Elasticisors for adhesion at 40 deg. F. PSTC test method: #1 modified for a 15 minute dwell time, with 2 mils of adhesive, 56 oz/inch width rating. Ink: Silkscreen type 4, with automotive grade pigments and binders, 0.0004-inch thick + 0.0001, inch high pigment volume concentration total PVC 40-50 (copper phthalocyanines). Liner: 0.0007-inch + 0.001-inch Kraft, coated one side chemical resistant. Salt spray 240 hours 5%, at 100 degrees, with no blistering, color change, or other material degradation. No effect when immersed in diesel fuel, motor oil, anti-freeze, detergent 2 %, ammonium hydroxide (12% and 39%), kerosene, acetic acid, acetone and water. Service temperature range: -40 to +170 deg. F. Minimum lifetime exterior durability of 15 years from installation date with proper surface preparation. Approved Manufacture or equal: Mitrographers, catalog number COA-001

“SIZE KVA” decal: width as required, 2 7/8 inches tall, Engineer Grade, adhesive reflective vinyl. Yellow numbers, black background.

“SECONDARY VOLTAGE” decal: width as required, 2-7/8 inches tall, Engineer Grade, adhesive reflective vinyl, Yellow numbers on Black Background. Sticker shall read “L-L Voltage Y/ L-G Voltage”.

“3-IN-1 WARNING” DECAL: The 3-in-1 safety decal for pad-mounted equipment shall be manufactured in accordance with Austin Energy drawing 1099-12 and shall comply with ANSI Z535.2 (latest revision), NESC, and UL 969 standards. The decal shall include all required safety warnings, clearance notices, and emergency contact information in both English and Spanish, with layout, formatting, and letter heights conforming to ANSI Z535.2. It shall be constructed using 0.007-inch engineering-grade retro-reflective sheeting with enclosed optical lens elements, printed with automotive-grade solvent-based silkscreen ink at a dry thickness of 0.0004 inches ± 0.0001 inches. A 0.002-inch UV-filtering overlaminate shall be applied, and the adhesive shall be a 0.0015-inch permanent solvent-based acrylic adhesive, ASTM D4956 Class 1, with a kraft liner and back slit. Water-based adhesives and UV-cured inks are not acceptable. The decal must have a minimum exterior durability of 20 to 25 years with proper surface preparation and a shelf life of at least two years. All decals shall be date-stamped with the month and year of manufacture. The material must pass UL 969 Legibility and Defacement Tests and have a current UL file number. The decal must remain legible and intact under exposure to salt spray (240 hours at 100°F, 5%) and common field chemicals including diesel fuel, motor oil, antifreeze, detergents, ammonia, kerosene, acetic acid, acetone, and water. It shall perform reliably in service temperatures ranging from - 40°F to +170°F. The manufacturer shall provide a written guarantee that the decal will not fade or peel for a minimum of 15 years from the date of installation; any defective decals shall be replaced in the field at no charge. Dimensions are 10.5” wide x 10” tall, with ¼” rounded corners. Wording shall be: WARNING Hazardous voltage. KEEP OUT! Can shock, burn, or cause death. If found damaged or unlocked call:

1-512-322-9100 WARNING Underground power cables are located in this area. Before digging or excavating call 811. Can shock, burn or cause death. NOTICE We need room to work safely on this device. Please keep shrubs and structures 10 feet away from the side with doors and 5 feet from other sides. Clearance from concrete pad. Obstructions may be damaged or removed during service restoration or maintenance.

AVISO Necesitamos espacio para trabajar con seguridad en este dispositivo. Por favor sigue arbustos y estructuras 10 pies lejos del lado con puertas y 5 pies de otros lados. Espacio libre de la plataforma de hormigón. Las obstrucciones pueden dañarse o eliminado durante el servicio restauración o mantenimiento. ¡ADVERTENCIA! Voltaje peligroso adentro. ¡NO ACERCARSE! Puede electrocutar, quemar o causar la muerte. Si encontrado dañado o abierto, llame a: 1-512-322-9100 ¡ADVERTENCIA! Cables subterráneos localizados en esta área. Antes de cavar o excavar llame 811. Puede electrocutar, quemar o causar la muerte.

“DANGER” DECAL: The danger decal for pad-mounted transformers shall be manufactured in accordance with Austin Energy drawing 1099-12 and shall comply with ANSI Z535.2 (latest revision), NESC, and UL 969 standards. The decal shall include all required safety warnings, clearance notices, and emergency contact information in both English and Spanish, with layout, formatting, and letter heights conforming to ANSI Z535.2. It shall be constructed using 0.007-inch engineering-grade retro-reflective sheeting with enclosed optical lens elements, printed with automotive-grade solvent-based silkscreen ink at a dry thickness of 0.0004 inches ± 0.0001 inches. A 0.002-inch UV-filtering overlaminate shall be applied, and the adhesive shall be a 0.0015-inch permanent solvent-based acrylic adhesive, ASTM D4956 Class 1, with a kraft liner and back slit. Water-based adhesives and UV-cured inks are not acceptable. The decal must have a minimum exterior durability of 20 to 25 years with proper surface preparation and a shelf life of at least two years. All decals shall be date-stamped with the month and year of manufacture. The material must pass UL 969 Legibility and Defacement Tests and have a current UL file number. The decal must remain legible and intact under exposure to salt spray (240 hours at 100°F, 5%) and common field chemicals including diesel fuel, motor oil, antifreeze, detergents, ammonia, kerosene, acetic acid, acetone, and water. It shall perform reliably in service temperatures ranging from - 40°F to +170°F. The manufacturer shall provide a written guarantee that the decal will not fade or peel for a minimum of 15 years from the date of installation; any defective decals shall be replaced in the field at no charge. Dimensions are 10.75” wide x 5.25” tall, with ¼” rounded corners. Wording shall be: DANGER Hazardous voltage. KEEP OUT! Will shock, burn or cause death. If open or unlocked, call: 1-512-322- 9100. PELIGRO Voltaje peligroso. ¡NO ACERCARSE! Producirá choques eléctricos, quemaduras, o causará la muerte. Si está abierto o sin seguro, llame: 1-512-322-9100.

ATTACHMENT IV-A

ATTACHMENT IV-B

3PH TRANSFORMER LABELING – INTERIOR & EXTERIOR

ATTACHMENT V

AUSTIN ENERGY TRANSFORMER TEST REPORT FORM

INSERT NAME OF MANUFACTURER

CERTIFIED TRANSFORMER TEST REPORT

VENDOR NAME: ______________

VENDOR PURCHASE ORDER #: __________

AE PURCHASE ORDER #: __________

AE STOCK NUMBER: ___________

MFG ORDER #: ___________

MFG CATALOG #: _________

MFG INVOICE #: ____________

MFG DRAWING #: ____________

TEST DATE: ____________

SHIP DATE: ____________

NOTES:

1. Losses are measured at 100% of rated voltage. No-load loss data corrected to 20°C. Load data corrected to 85°C.

2. All transformers were manufactured using insulating fluid containing less than 1 PPM PCB. ASTM D4059 Test Certification available.

3. The winding temperature rise above ambient temperature does not exceed 65°C.

4. Exciting current is measured at 100% rated load.

5. All transformers listed have received and passed the following test, in accordance with ANSI/IEEE

C57.12.00, latest edition: Continuity, Ratio, Leak, Polarity and Phase Relationship, Routine Impulse, Induced Voltage, Applied Voltage.

THE MANUFACTURER CERTIFIES THIS TEST REPORT IS A TRUE AND ACCURATE RECORD OF

FINAL PRODUCTION-LINE TEST THAT WERE CONDUCTED IN ACCORDANCE WITH CURRENT ANSI

TRANSFORMER TEST STANDARDS, AND THAT THE TRANSFORMERS BELOW WITHSTOOD THESE

TESTS.

NAME OF CERTIFYING INDIVIDUAL: ________________________

The following information shall be included in the test report and formatted as shown on the table below.

Make: MFG Name Phase (φ) High Voltage Low Voltage: 120/208V or 277/480V Serial # kVA: Sizes 75-2500kVA Losses

• Measured No-Load Loss (NLL) in Watts

• Measured Load Loss (LL) in Watts

• Measured Total Loss (TL) in Watts

DOE Efficiency Percent Impedance: % Z Type: ANSI 1 Frequency: 60hz Basic Impulse Level (BIL): High/Low (95kV/30kV) Regulation at:

• 80% PF

• 100% PF

Exciting Current (Ie) Date Tested:

MAKE φ HIGH

VOLT.

LOW

VOLT.

SERIAL # KVA NLL

(WATTS)

LL

(WATTS)

TL

(WATTS)

DOE

EFF. %

% Z

MFG NAME 3PH 12470 277/480 ######### 2500 XXX XXX XXX 99.XX 5.75

MFG NAME 3PH 12470 120/208 ######### 500 XXX XXX XXX 99.XX 2.00

TYPE Freq.

(HZ)

BIL KV

(HI/LOW)

REG @

80% PF

REG @

100% PF

Ie DATE

TESTED

ANSI 1 60 95/30 XX/XX/XX

ANSI 1 60 95/30 XX/XX/XX