TRANSFORMER SPECIFICATIONS LIST-2000KVA.pdf

2000 KVA

THREE-PHASE, LIQUID INSULATED, PAD-MOUNTED TRANSFORMERS

10 Jun 2021

PART 1 SUMMARY LIST OF TRANSFORMER SPECIFICATIONS AND OPTIONS

1 TRANSFORMER SPECIFICATIONS AND OPTIONS (See Part 3 for full details)

1.1 2000 KVA Three Phase, Two Winding

1.2 12470 Volts AC Delta – 480/277 Volts AC, Y-Grounded, 60 Hertz

1.3 Transformer Windings: Primary – Copper; Secondary – Copper

1.4 Transformer Cooling Class: KNAN, Self Cooled

1.5 Insulating Liquid: Biodegradable, FM Approved Less-Flammable Liquid

1.6 Temperature Rise: 65 Degree C above 30 Degree C Average Ambient

1.7 Minimum tested percent impedance: 5.32 per Paragraph 3.1.1.6

1.8 DOE 2016 Standard Compliant. See Paragraph 3.1.1.9.

1.9 Maximum Audible Sound Level: 61/67 decibels per Paragraph 3.1.1.7.

1.10 High and low voltage compartments separated by steel isolating barriers with hinged, lift-off, three-point latching, pad-lockable, compartment doors that stop in open position.

1.10.1 High Voltage Compartment includes:

a. Insulated high-voltage load-break connectors, 200 A, 95 KV BIL, steel reinforced hook stick eye, grounding eye, test point, & arc quenching

b. Bushing well inserts, 200 A, 15 KV

c. Six high-voltage bushing wells configured for loop feed application

d. Loop feed load-break switch handle. See Paragraph 3.1.2.1.d.

e. Bayonet type, oil-immersed, expulsion fuses in series with oil-immersed, partial range, current limiting fuses

• Oil retention (flapper) valve

• External drip shield

• Bayonet assembly rated to 150 KV BIL

f. 15 KV, fully shielded, dead-front, elbow type MOV surge arresters with resistance graded gap, 3 each

g. 5 Tap Position Changer in HV Compartment– 2 each at 2.5% increments Above and 2 each at 2.5% increments Below rated voltage

h. Connector parking stands with insulated standoff bushings and protective caps, 15 KV, 200 A

i. Ground pad

1.10.2 Low Voltage Compartment

a. Staggered Low Voltage Stud Connectors with NEMA spade terminals, 12 hole minimum, spade terminal supports as necessary

b. An insulated low-voltage neutral bushing with NEMA spade terminal, 12 hole minimum, and with removable ground strap

c. Stainless steel or laser-etched anodized aluminum diagrammatic transformer nameplate

d. 1 inch Drain Valve with 3/8 inch sampler device

e. 1 inch Upper Fill Plug

f. Pressure relief device (Schrader valve)

g. Liquid Level Gauge

h. Pressure Vacuum Gauge

i. Dial type thermometer with maximum temperature indicated

j. Ground pad and bonding jumpers as typical

1.11 Paint Finish: Munsell 7GY 3.29/1.5 Pad Mount Green

1.12 Lifting lugs and provisions for jacking under base, with base construction suitable for using rollers or skidding in any direction.

1.13 Provide transformer top with an access hand hole, 8 inches by 19 inches minimum.

1.14 Transformer test reports and Government option to witness tests

PART 2 GENERAL

COMMON ISSUES THAT NEED CLARIFICATION

1. CRITICAL: A copper primary and a copper secondary coil is required.

Please clarify and address.

2. NEMA TR-1 Sound level compliance: Please specify if the "similar" transformer tested met the standard or not.

3. The offer does not address the barrier between the high voltage and low voltage sections nor does it address the doors very well. Please clarify.

4. The offer does not address the high voltage "parking stands with insulated bushings" or the caps.

5. The offer states in the general notes that "UL Listed" is stamped on the name plate, so it is metal of some sort. Can they mention the metal it is made from?

6. The offer does not mention the required "1 Inch Upper Fill Plug". I am sure there is one, but can they confirm?

7. The offer does not address the lift lug, jacking, rolling, or skidding provisions of the transformer.

8. The offer does not mention a grounding connection point/pad for either the high or low voltage compartment. Please clarify if this is provided or not.

Specifically for the 2000 KVA transformer, the offer provides a 10 hole spade secondary connection and specification requires 12. Due to recent developments in the application of the transformers in the overall project, we can accept the 10 hole capacity if the above items are addressed

2 GENERAL REFERENCES, DEFINITIONS, SUBMITTALS, QUALIFICATIONS

2.1 REFERENCES

The publications listed below form a part of this specification to the extent referenced. The publications are referred to within the text by the basic designation only. Use the most recent version of the referenced publications listed below.

ASTM INTERNATIONAL (ASTM)

ASTM A240/A240M (2017) Standard Specification for

Chromium and Chromium-Nickel Stainless Steel Plate, Sheet, and Strip for Pressure Vessels and for General Applications

ASTM D117 (2010) Standard Guide for Sampling, Test Methods, Specifications and Guide for Electrical Insulating Oils of Petroleum Origin

ASTM D1535 (2014) Specifying Color by the

Munsell System

ASTM D3487 (2016) Standard Specification for Mineral Insulating Oil Used in Electrical Apparatus

ASTM D877/D877M (2013) Standard Test Method for Dielectric Breakdown Voltage of Insulating Liquids Using Disk Electrodes

ASTM D92 (2012a) Standard Test Method for Flash and Fire Points by Cleveland Open Cup Tester

ASTM D97 (2017a) Standard Test Method for

Pour Point of Petroleum Products

FM GLOBAL (FM)

FM APP GUIDE (updated on-line) Approval Guide http://www.approvalguide.com/

INSTITUTE OF ELECTRICAL AND ELECTRONICS ENGINEERS (IEEE)

IEEE 386 (2016) Separable Insulated

Connector Systems for Power Distribution Systems Rated 2.5 kV through 35 kV

IEEE C2 (2017; Errata 1-2 2017; INT 1 2017)

National Electrical Safety Code

IEEE C37.47 (2011) Standard for High Voltage Distribution Class Current-Limiting Type Fuses and Fuse Disconnecting Switches

IEEE C57.12.00 (2015) General Requirements for

Liquid-Immersed Distribution, Power, and Regulating Transformers

IEEE C57.12.28 (2014) Standard for Pad-Mounted Equipment

- Enclosure Integrity

IEEE C57.12.29 (2014) Standard for Pad-Mounted Equipment

- Enclosure Integrity for Coastal Environments

IEEE C57.12.34 (2009) Standard for Requirements for

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

IEEE C57.12.80 (2010) Standard Terminology for Power and

Distribution Transformers

IEEE C57.12.90 (2015; Corr 2017) Test Code for

Liquid-Immersed Distribution, Power, and Regulating Transformers

IEEE C57.13 (2016) Requirements for Instrument

Transformers

IEEE C57.98 (2011) Guide for Transformer Impulse Tests

IEEE C62.11 (2012) Standard for Metal-Oxide Surge

Arresters for Alternating Current Power Circuits (>1kV)

IEEE Stds Dictionary (2009) IEEE Standards Dictionary: Glossary of Terms & Definitions

INTERNATIONAL ELECTRICAL TESTING ASSOCIATION (NETA)

NETA ATS (2017; Errata 2017) Standard for Acceptance Testing Specifications for Electrical Power Equipment and Systems

NATIONAL ELECTRICAL MANUFACTURERS ASSOCIATION (NEMA)

ANSI C12.7 (2014) Requirements for Watthour Meter

Sockets

NEMA 260 (1996; R 2004) Safety Labels for Pad-

Mounted Switchgear and Transformers Sited in Public Areas

NEMA LI 1 (1998; R 2011) Industrial Laminating

Thermosetting Products

NEMA Z535.4 (2011) American National Standard for

Product Safety Signs and Labels

NEMA/ANSI C12.10 (2011) Physical Aspects of Watthour Meters

- Safety Standards

NATIONAL FIRE PROTECTION ASSOCIATION (NFPA)

NFPA 70 (2020) National Electrical Code

ORGANISATION FOR ECONOMIC CO-OPERATION AND DEVELOPMENT (OECD)

OECD Test 203 (1992) Fish Acute Toxicity Test

U.S. ENVIRONMENTAL PROTECTION AGENCY (EPA)

EPA 712-C-98-075 (1998) Fate, Transport and Transformation Test Guidelines - OPPTS 835.3100- "Aerobic Aquatic Biodegradation"

EPA 821-R-02-012 (2002) Methods for Measuring the Acute

Toxicity of Effluents and Receiving Waters to Freshwater and Marine Organisms

U.S. NATIONAL ARCHIVES AND RECORDS ADMINISTRATION (NARA)

10 CFR 431 Energy Efficiency Program for

Certain Commercial and Industrial

Equipment

UNDERWRITERS LABORATORIES (UL)

UL 467 (2013; Reprint Jun 2017) UL Standard for Safety Grounding and Bonding Equipment

2.2 DEFINITIONS

Unless otherwise specified or indicated, electrical and electronics terms used in these specifications, and on the drawings, are as defined in IEEE Stds Dictionary.

2.3 SUBMITTALS

Government approval is required for submittals with a "G" designation; submittals not having a "G" designation are for information only. When used, a designation following the "G" designation identifies the office that will review the submittal for the Government. Submit the following in accordance with procedures established by the Contracting Officer (CO):

2.3.1 Submit the following information as part of the initial contract proposal package for consideration of solicitation award:

SD-02 Shop Drawings Pad-mounted Transformer Drawings (See Paragraph 1.4.1); G,DES-FE

SD-03 Product Data Pad-mounted Transformers; G, DES-FE

SD-07 Certificates Transformer Efficiencies; G, DES-FE

2.3.2 The successful bidder shall submit the following information for approval not less than 30 days prior to the planned testing date for the transformer. The CO will notify the contract supplier if a government representative will be present for the planned tests.

SD-09 Manufacturer's Field Reports

Transformer Test Schedule; G, DES-FE

Pad-mounted Transformer Design Tests; G, DES-FE

2.3.3 The successful bidder shall submit the following information for approval following contract award and not less than 10 days prior to shipment of the transformer:

SD-06 Test Reports Acceptance Checks and Tests; G, DES-FE

SD-09 Manufacturer's Field Reports

Pad-mounted Transformer Routine and Other Tests; G, DES-FE

2.3.4 The successful bidder shall submit the following information in the shipment of the transformer:

SD-10 Operation and Maintenance Manuals and Data

Transformer(s) (See Paragraph 1.5), G, DES-FE

2.3.5 Reduced Submittal Requirements

Transformers designed and manufactured by ABB in Jefferson City, MO;

by Easton's Cooper Power Series Transformers in Waukesha, WI; by ERMCO in Dyersburg, TN; or by Howard Industries in Laurel, MS need not submit the entire submittal package requirements of this contract. Instead, the following items shall be submitted:

a. A certification, signed by the manufacturer, stating that the manufacturer will meet the technical requirements of this specification.

b. An outline drawing of the transformer with devices identified (SD-02 PAD-MOUNTED TRANSFORMER DRAWINGS, Para 1.4.1, item a).

c. ANSI nameplate data of the transformer (paragraph PAD-MOUNTED

TRANSFORMER DRAWINGS, Para 1.4.1, item b).

d. Manufacturer's published time-current curves in PDF format and in electronic format suitable for import or updating into the EasyPower computer program of the transformer high side fuses (paragraph PAD MOUNTED TRANSFORMER DRAWINGS, Para 1.4.1, item e).

e. Routine and other tests (in Part 2 of this specification, see paragraph 2.6 SOURCE QUALITY CONTROL), conducted by the manufacturer. These tests may be witnessed by the government. Provide transformer test schedule required by submittal item "SD-09 Manufacturer's Field Reports".

Provide certified copies of the tests as required by submittal item “SD-06 Test Reports.”

f. Provide acceptance test reports required by submittal item

"SD-06 Test Reports".

g. Provide operation and maintenance manuals required by submittal item "SD-10 Operation and Maintenance Data".

2.4 QUALITY ASSURANCE

2.4.1 Pad-Mounted Transformer Drawings Include the following as a minimum:

a. An outline drawing, including front, top, and side views.

b. IEEE nameplate data.

c. Elementary diagrams and wiring diagrams.

d. One-line diagram, including switch(es), current transformers, meters, and fuses as applicable.

e. Manufacturer's published time-current curves in PDF format and in electronic format suitable for import or updating into the EasyPower computer program of the transformer high side fuses.

2.4.2 Regulatory Requirements

In each of the publications referred to herein, consider the advisory provisions to be mandatory, as though the word, "shall" or "must" had been substituted for "should" wherever it appears. Interpret references in these publications to the "authority having jurisdiction," or words of similar meaning, to mean the Contracting Officer. Provide equipment, materials, installation, and workmanship in accordance with NFPA 70 unless more stringent requirements are specified or indicated.

2.4.3 Standard Products

Provide materials and equipment that are products of manufacturers regularly engaged in the production of such products which are of equal material, design and workmanship, and:

a. Have been in satisfactory commercial or industrial use for 2 years prior to bid opening including applications of equipment and materials under similar circumstances and of similar size.

b. Have been on sale on the commercial market through advertisements, manufacturers' catalogs, or brochures during the 2-year period.

c. Where two or more items of the same class of equipment are required, provide products of a single manufacturer; however, the component parts of the item need not be the products of the same manufacturer unless stated in this section.

2.4.4 Alternative Qualifications

Products having less than a 2-year field service record will be acceptable if a certified record of satisfactory field operation for not less than 6000 hours, exclusive of the manufacturers' factory or laboratory tests, is furnished.

2.4.5 Material and Equipment Manufacturing Date

Products manufactured more than 3 years prior to date of delivery to site are not acceptable.

2.5 MAINTENANCE

2.5.1 Additions to Operation and Maintenance Data

Submit operation and maintenance data including the following on the actual transformer(s) provided:

a. An instruction manual with pertinent items and information highlighted

b. An outline drawing, front, top, and side views

c. Prices for spare parts and supply list

d. Routine and field acceptance test reports

e. Fuse curves for primary fuses

f. Actual nameplate diagram

g. Date of purchase

PART 3

3 PRODUCT

THREE-PHASE PAD-MOUNTED TRANSFORMERS

IEEE C57.12.34, IEEE C57.12.28 and as specified herein. Submit manufacturer's information for each component, device, insulating fluid, and accessory provided with the transformer.

3.1.1 Transformer

Less-flammable liquid-insulated, two winding, 60 hertz, 65 degrees C rise above a 30 degrees C average ambient, self-cooled with forced air assist type

3.1.1.1 Transformer rated 2000 kVA.

3.1.1.2 Transformer voltage ratings: 12,470 V Delta – 480/277 V Grounded Y.

3.1.1.3 Transformer Cooling Class: KNAN – Self Cooling with Less Flammable

Liquid

3.1.1.4 Transformer Windings: Primary – Copper;

Secondary – Copper

3.1.1.5 Tap changer: externally operated, manual type for changing tap setting when the transformer is de-energized. Provide four 2.5 percent full capacity taps, two above and two below rated primary voltage. Indicate which tap setting is in use, clearly visible when the compartment is opened.

3.1.1.6 Minimum tested percent impedance at 85 degrees C:

5.32 for units rated 750kVA and above

3.1.1.7 Comply with the NEMA TR1 Standard and the following audible sound level limits. For 500 – 5000 KVA fan assisted transformers, 67 decibels is acceptable.

kVA DECIBELS

(MAXIMUM)

75 51

112.5 55 150 55 225 55 300 55 500 56 750 57 1000 58 1500 60

2000 61 2500 62

3.1.1.8 Include:

a. Lifting lugs and provisions for jacking under base, with base construction suitable for using rollers or skidding in any direction.

b. An insulated low-voltage neutral bushing with NEMA spade terminal, and with removable ground strap.

c. Provide transformer top with a bolted access hand hole.

3.1.1.9 Specified Transformer Efficiencies

Provide transformer efficiency calculations utilizing the actual no-load and load loss values obtained during the routine tests performed on the actual transformer(s) prepared for this project.

Reference no-load losses (NLL) at 20 degrees C. Reference load losses (LL) at 55 degrees C and at 50 percent of the nameplate load. The transformer is not acceptable if the calculated transformer efficiency is less than the efficiency indicated in the "KVA / Efficiency" table below. The table is based on requirements contained within 10 CFR 431, Subpart K. Submit certification, including supporting calculations, from the manufacturer indicating conformance kVA EFFICIENCY

(percent) 15 98.65 30 98.83 45 98.92 75 99.03

112.5 99.11 150 99.16 225 99.23 300 99.27 500 99.35 750 99.40 1000 99.43 1500 99.48 2000 99.51 2500 99.53 above 2500 99.54

3.1.2 Compartments

Provide high- and low-voltage compartments separated by steel isolating barriers extending the full height and depth of the compartments. When viewed from the front, the low-voltage compartment shall be on the right.

Compartment doors: Each compartment shall have a door that is constructed so as to provide access to the high-voltage compartment only after the door to the low-voltage compartment has been opened.

There shall be one or more additional fastening devices that must be removed before the high-voltage door can be opened. The compartment doors shall be hinged, lift-off type with a stop in open position. The low voltage compartment door shall be three-point latching

3.1.2.1 High Voltage, Dead-Front Compartment

High-voltage compartment contains: the incoming line, insulated high-voltage load-break connectors, bushing well inserts, six high-voltage bushing wells configured for loop feed application, load-break switch handle(s), access to oil-immersed bayonet fuses, dead-front surge arresters, tap changer handle, connector parking stands with insulated standoff bushings, protective caps, and ground pad.

a. Minimum high-voltage compartment dimensions: IEEE C57.12.34, Figures 16 and 17.

b. Insulated high-voltage load-break connectors: IEEE 386, rated 15 kV, 95 kV BIL. Current rating: 200 amperes rms continuous. Short time rating: 10,000 amperes rms symmetrical for a time duration of 0.17 seconds. Connector shall have a steel reinforced hook-stick eye, grounding eye, test point, and arc-quenching contact material

c. Bushing well inserts and feed-thru inserts: IEEE 386, 200 amperes, 15 kV Class. Provide a bushing well insert for each bushing well unless indicated otherwise. Provide feed-thru inserts as indicated.

d. Load-break switch

Loop feed sectionalizer switches: Provide oil-immersed type switches to permit closed transition loop feed and sectionalizing. Each switch must be rated at 15 kV, 95 kV BIL, with a continuous current rating and load-break rating of 200 amperes, and a make-and-latch rating of 12,000 rms amperes symmetrical. Locate the switch handle(s) in the high-voltage compartment. Operation of switches must be as follows:

ARRANGEMENT

NO.

DESCRIPTION OF

SWITCH ARRANGEMENT

SWITCH POSITION

LINE A SW. LINE B SW XFMR. SW

OPEN CLOSE OPEN CLOSE OPEN CLOSE

1 Line A connected to Line B and both lines connected to transformer

X X X

2 Transformer connected to Line A only

X X X

3 Transformer connected to Line B only

X X X

e. Provide bayonet oil-immersed, expulsion fuses in series with oil-immersed, partial-range, current-limiting fuses. The bayonet fuse links sense both high currents and high oil temperature in order to provide thermal protection to the transformer. Coordinate transformer protection with expulsion fuse clearing low-current faults and current-limiting fuse clearing high-current faults beyond the interrupting rating of the expulsion fuse. Include an oil retention valve inside the bayonet assembly housing, which closes when the fuse holder is removed, and an external drip shield to minimize oil spills. Display a warning label adjacent to the bayonet fuse(s) cautioning against removing or inserting fuses unless the transformer has been de-energized and the tank pressure has been released.

Bayonet fuse assembly: 150 kV BIL.

Oil-immersed current-limiting fuses: IEEE C37.47; 50,000 rms amperes symmetrical interrupting rating at the system voltage specified.

f. Surge arresters: IEEE C62.11, rated 15 kV, fully shielded, dead-front, metal-oxide-varistor, elbow type with resistance-graded gap.

Provide six arresters for loop feed circuits.

g. Parking stands: Provide a parking stand near each bushing. Provide insulated standoff bushings for parking of energized high-voltage connectors on parking stands.

h. Protective caps: IEEE 386, 200 amperes, 15 kV Class. Provide insulated protective caps (not shipping caps) for insulating and sealing out moisture from unused bushings.

3.1.2.2 Low Voltage Compartment

Low-voltage compartment contains: low-voltage bushings with NEMA spade terminals, spade terminal supports as necessary, accessories, metering, stainless steel or laser-etched anodized aluminum diagrammatic transformer nameplate, and ground pad.

a. Include the following accessories: drain valve with sampler device, fill plug, pressure relief device, liquid level gage, pressure-vacuum gage, and dial type thermometer with maximum temperature indicator.

3.1.3 Insulating Liquid

3.1.3.1 Less-flammable transformer liquids: NFPA 70 and FM APP GUIDE for less-flammable liquids having a fire point not less than 300 degrees C tested per ASTM D92 and a dielectric strength not less than 33 kV tested per ASTM D877/D877M. Provide identification of transformer as "non-PCB" and "manufacturer's name and type of fluid" on the nameplate.

4 Transformer open and loop closed

X X X

5 Transformer open and loop open

X X X

Provide a fluid that is a biodegradable, electrical insulating, and cooling liquid classified by UL and approved by FM as "less flammable" with the following properties

a. Pour point: ASTM D97, less than -15 degree C

b. Aquatic biodegradation: EPA 712-C-98-075, 100 percent

c. Trout toxicity: OECD Test 203, zero mortality of EPA 821-R-02-012, pass

3.1.3.2 Liquid-Filled Transformer Nameplates

Provide nameplate information in accordance with IEEE C57.12.00 and as modified or supplemented by this section.

3.1.4 Corrosion Protection

Paint entire transformer assembly Munsell 7GY3.29/1.5 green, with paint coating system complying with IEEE C57.12.28 regardless of base, cabinet, and tank material. The Munsell color notation is specified in ASTM D1535.

3.2 WARNING SIGNS AND LABELS

Provide warning signs for the enclosures of pad-mounted transformers having a nominal rating exceeding 600 volts in accordance with NEMA Z535.4 and NEMA 260.

When the enclosure integrity of such equipment is specified to be in accordance with IEEE C57.12.28, such as for pad-mounted transformers, provide self-adhesive warning labels (decals, Panduit No. PPSO710D72 or approved equal) on the outside of the high voltage compartment door(s)with nominal dimensions of 7 by 10 inches with the legend "WARNING HIGH VOLTAGE" printed in two lines of nominal 2 inch high letters. Include the word "WARNING" in white letters on an orange background and the words "HIGH VOLTAGE" in black letters on a white background.

3.3 ARC FLASH WARNING LABEL

Provide arc flash warning label for the enclosure of pad-mounted transformers. Locate this self-adhesive warning label on the outside of the high voltage compartment door warning of potential electrical arc flash hazards and appropriate PPE required. Provide label format as indicated.

3.4 PADLOCKS

Door handle shall be pad-lockable and include a captive penta-head bolt

3.5 GROUNDING AND BONDING

Provide grounding pads and bonding jumpers as typical.

3.6 SOURCE QUALITY CONTROL

3.6.1 Transformer Test Schedule

The Government reserves the right to witness tests. Provide transformer test schedule for tests to be performed at the manufacturer's test facility. Submit required test schedule and location, and notify the Contracting Officer 30 calendar days before scheduled test date. Notify Contracting Officer 15 calendar days in advance of changes to scheduled date.

3.6.1.1 Test Instrument Calibration

a. Provide a calibration program which assures that all applicable test instruments are maintained within rated accuracy.

b. Accuracy: Traceable to the National Institute of Standards and Technology.

c. Instrument calibration frequency schedule: less than or equal to 12 months for both test floor instruments and leased specialty equipment.

d. Dated calibration labels: visible on all test equipment.

e. Calibrating standard: Higher accuracy than that of the instrument tested.

f. Keep up-to-date records that indicate dates and test results of instruments calibrated or tested. For instruments calibrated by the manufacturer on a routine basis, in lieu of third party calibration, include the following:

(1) Maintain up-to-date instrument calibration instructions and procedures for each test instrument.

(2) Identify the third party/laboratory calibrated instrument to verify that calibrating standard is met.

3.6.2 Design Tests

IEEE C57.12.00, and IEEE C57.12.90. Section 5.1.2 in IEEE C57.12.80 states that "design tests are made only on representative apparatus of basically the same design." Submit design test reports (complete with test data, explanations, formulas, and results), in the same submittal package as the catalog data and drawings for the specified transformer(s), with design tests performed prior to the award of this contract.

3.6.2.1 Tests: Certified and signed by a registered professional engineer.

3.6.2.2 Temperature rise: "Basically the same design" for the temperature rise test means a pad-mounted transformer with the same coil construction (such as wire wound primary and sheet wound secondary), the same kVA, the same cooling type (ONAN), the same temperature rise rating, and the same insulating liquid as the transformer specified.

3.6.2.3 Lightning impulse: "Basically the same design" for the lightning impulse dielectric test means a pad-mounted transformer with the same BIL, the same coil construction (such as wire wound primary and sheet wound secondary), and a tap changer, if specified.

Design lightning impulse tests includes the primary windings only of that transformer.

a. IEEE C57.12.90, paragraph 10.3 entitled "Lightning Impulse Test Procedures," and IEEE C57.98.

b. State test voltage levels.

c. Provide photographs of oscilloscope display waveforms or plots of digitized waveforms with test report.

3.6.2.4 Lifting and moving devices: "Basically the same design" requirement for the lifting and moving devices test means a test report confirming that the lifting device being used is capable of handling the weight of the specified transformer in accordance with

IEEE C57.12.34.

3.6.2.5 Pressure: "Basically the same design" for the pressure test means a pad-mounted transformer with a tank volume within 30 percent of the tank volume of the transformer specified.

3.6.2.6 Short circuit: "Basically the same design" for the short circuit test means a pad-mounted transformer with the same kVA as the transformer specified.

3.6.3 Routine and Other Tests

IEEE C57.12.00. Routine and other tests: performed in accordance with IEEE C57.12.90 by the manufacturer on the actual transformer(s) prepared for this project to ensure that the design performance is maintained in production. Submit test reports, by serial number and receive approval before delivery of equipment to the project site. Required tests and testing sequence as follows:

3.6.3.1 Phase relation

3.6.3.2 Ratio

3.6.3.3 No-load losses (NLL) and excitation current

3.6.3.4 Load losses (LL) and impedance voltage

3.6.3.5 Dielectric

a. Impulse

b. Applied Voltage

c. Induced voltage

3.6.3.6 Leak

-- End of Section --