337300 UTILITY TRANSFORMERS 20260212 (1).pdf

SECTION 33 73 00.00 40 Page 1

SECTION TABLE OF CONTENTS

DIVISION 33 - UTILITIES

SECTION 33 73 00.00 40

UTILITY TRANSFORMERS

05/19

PART 1 GENERAL

1.1 REFERENCES

1.2 ADMINISTRATIVE REQUIREMENTS

1.2.1 Pre-Installation Meeting

1.3 SUBMITTALS

1.4 QUALITY CONTROL

1.4.1 Regulatory Requirements

1.4.2 Qualifications

1.4.3 Certificates of Compliance

1.5 DELIVERY, STORAGE, AND HANDLING

1.6 MAINTENANCE MATERIAL SUBMITTALS

1.7 WARRANTY

PART 2 PRODUCTS

2.1 SYSTEM DESCRIPTION

2.1.1 Design Requirements

2.1.2 Performance Requirements

2.1.2.1 Impedance

2.1.2.2 Short-Circuit Withstand

2.1.2.3 Voltage Ratings

2.1.2.4 Insulation Class

2.1.2.5 Basic Impulse Insulation Levels

2.2 FABRICATION

2.2.1 Painting

2.3 COMPONENTS

2.3.1 Tank

2.3.2 Bushings

2.3.3 Cores

2.3.4 Coils

2.3.5 Cooling Provisions

2.3.6 Automatic Load-Tap Changing Equipment

2.3.7 Insulating Liquid

2.4 ACCESSORIES

2.4.1 Space Heaters

2.4.2 External Voltage Source

2.4.3 Miscellaneous

2.5 FACTORY TESTING

2.5.1 Transformer Test Schedule

2.5.2 Design Tests

2.5.3 Routine and Other Tests

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PART 3 EXECUTION

3.1 INSTALLATION

3.2 FIELD QUALITY CONTROL

3.2.1 Acceptance Tests

3.3 CLOSEOUT ACTIVITIES

3.3.1 Test Reports

3.3.2 Maintenance

-- End of Section Table of Contents --

SECTION 33 73 00.00 40 Page 3

PART 1 GENERAL

1.1 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.

ASTM INTERNATIONAL (ASTM)

ASTM A345 (2019) Standard Specification for

Flat-Rolled Electrical Steels for Magnetic

Applications

ASTM B48 (2000; R 2021; E 2021) Standard

Specification for Soft Rectangular and

Square Bare Copper Wire for Electrical

Conductors

ASTM D92

(2012a) Standard Test Method for Flash and

Fire Points by Cleveland Open Cup Tester

ASTM D97

(2017b) Standard Test Method for Pour

Point of Petroleum Products

ASTM D117 (2018) Standard Guide for Sampling, Test

Methods, and Specifications for Electrical

Insulating Liquids

ASTM D877 (2002; R 2007) Standard Test Method for

Dielectric Breakdown Voltage of Insulating

Liquids Using Disk Electrodes

ASTM D924 (2008) Standard Test Method for

Dissipation Factor (or Power Factor) and

Relative Permittivity (Dielectric

Constant) of Electrical Insulating Liquids

ASTM D974

(2014; E 2016) Standard Test Method for

Acid and Base Number by Color-Indicator

Titration

ASTM D1533

(2012) Standard Test Method for Water in

Insulating Liquids by Coulometric Karl

Fischer Titration

ASTM D3487

(2016; E2017) Standard Specification for

Mineral Insulating Oil Used in Electrical

Apparatus

ASTM D3612 (2002; R 2017) Standard Test Method for

Analysis of Gases Dissolved in Electrical

Insulating Oil by Gas Chromatography

FM GLOBAL (FM)

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

INSTITUTE OF ELECTRICAL AND ELECTRONICS ENGINEERS (IEEE)

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IEEE 62 (1995; R 2005) Guide for Diagnostic Field

Testing of Electric Power Apparatus-Part

1: Oil Filled Power Transformers, Regulators, and Reactors

IEEE C2 (2023) National Electrical Safety Code

IEEE C37.121

(2012) American National Standard for

Switchgear-Unit Substations - Requirements

IEEE C57.12.00 (2021) General Requirements for

Liquid-Immersed Distribution, Power, and

Regulating Transformers

IEEE C57.12.10

(2017) Requirements for Liquid-Immersed

Power Transformers

IEEE C57.12.34 (2022) Standard Requirements for

Pad-Mounted, Compartmental-Type, Self-Cooled, Three-Phase Distribution

Transformers, 10 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 (2021) Test Code for Liquid-Immersed

Distribution, Power, and Regulating

Transformers

IEEE C57.19.00 (2023) Standard General Requirements and

Test Procedures for Outdoor Power

Apparatus Bushings

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

NATIONAL FIRE PROTECTION ASSOCIATION (NFPA)

NFPA 70 (2023) National Electrical Code

ORGANIZATION FOR ECONOMIC CO-OPERATION AND DEVELOPMENT (OECD)

OECD Test 203 (1992) Fish Acute Toxicity Test

U.S. ENVIRONMENTAL PROTECTION AGENCY (EPA)

EPA 600/4-90/027F (1993) Methods for Measuring the Acute

Toxicity of Effluents and Receiving Waters to Freshwater and Marine Organisms

EPA 712-C-98-075 (1998) Fate, Transport and Transformation

Test Guidelines - OPPTS 835.3100- "Aerobic

Aquatic Biodegradation"

1.2 ADMINISTRATIVE REQUIREMENTS

1.2.1 Pre-Installation Meeting

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Within 30 calendar days after date of award, submit for the approval of the Contracting Officer Representative (COR)___3__ copies of specified drawings of all equipment to be furnished under this contract, together with weights and overall dimensions.

1.3 SUBMITTALS

Submit the following in accordance with 013323 SHOP DRAWINGS, PRODUCT

DATA, AND SAMPLES SUBMITTAL PROCEDURES:

SD-01 Preconstruction Submittals

Transformer Test Schedule

SD-02 Shop Drawings

Connection Diagrams

Fabrication Drawings

Installation Drawings

Equipment Foundation Drawings

SD-03 Product Data

Power Transformers

Manufacturer's Instructions

SD-06 Test Reports

Factory Test Reports

Acceptance Tests

SD-07 Certificates

Certificates of Compliance

SD-11 Closeout Submittals

Final Test Reports Operation And Maintenance

Manuals

Warranty

1.4 QUALITY CONTROL

1.4.1 Regulatory Requirements

In each of the publications referred to herein, consider the advisory provisions to be mandatory, as though the word, "shall" 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 (CO). Ensure equipment, materials, installation, and workmanship are in accordance with the

SECTION 33 73 00.00 40 Page 6 mandatory and advisory provisions of NFPA 70, IEEE C2 unless more stringent requirements are specified or indicated.

1.4.2 Qualifications

Provide materials and equipment that are products of manufacturers regularly engaged in the production of oil filled transformers and their component parts and equipment which are of equal material, design and workmanship. Provide products that are of the latest standard design for outdoor service which have been in satisfactory commercial or industrial use for 2 years with no less than 150 units manufactured prior to bid opening. Ensure the 2-year period includes applications of equipment and materials under similar circumstances and of similar size. Ensure the product has been on sale on the commercial market through advertisements, manufacturers' catalogs, or brochures during the 2-year period. Where two or more items of the same class of equipment are required, these items must be products of a single manufacturer.

1.4.3 Certificates of Compliance

Submit certificates of compliance of previous tests on similar units under actual conditions for temperature rise, bushing tests, and short-circuit tests in lieu of factory tests on actual units furnished is acceptable upon approval.

1.5 DELIVERY, STORAGE, AND HANDLING

Do not ship transformer to the site until all factory tests and their results are approved by the Contracting Officer Representative (COR) and the equipment is inspected and approved by the Contracting Officer

Representative (COR) unless he has given the manufacturer a written waiver.

Do not use products manufactured more than one year prior to date of delivery to site, unless specified otherwise.

After the transformer arrives on site and prior to installation, the

Government will perform an insulation power factor test and take an oil sample for a dielectric test, dissolved gas analysis, water-in-oil (Karl

Fischer) test, oil acidity test, and PCB content determination. Test results will be used as baseline for future maintenance and compared to factory test results to ensure compliance with all requirements.

1.6 MAINTENANCE MATERIAL SUBMITTALS

In addition to requirements of Section 01 78 00, Data Package 5, include the following information on the actual Power Transformers provided:

a. An instruction manual with pertinent items and information highlighted

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

c. Routine and field acceptance test reports

d. Automatic load-tap changing equipment and accessories

e. Fuse curves for all fuses

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f. Actual nameplate diagram

g. Date of purchase

1.7 WARRANTY

Provide three (3) copies of the warranty to the Contracting Officer (CO).

Ensure the equipment items are supported by service organizations which are reasonably convenient to the equipment installation in order to render satisfactory service to the equipment on a regular and emergency basis during the warranty period of the contract.

PART 2 PRODUCTS

2.1 SYSTEM DESCRIPTION

2.1.1 Design Requirements

Provide station power transformers with primary connections to underground high-voltage incoming lines and secondary connections to underground cables that are two-winding, three-phase, 60-hertz (Hz), oil-immersed, 55/65-degree C rise above a 30 degrees C86 degrees Fahrenheit average ambient, self-cooled Class OA outdoor type conforming to IEEE

C57.12.00 and IEEE C57.12.80.

Submit complete design and manufacturer's catalog data on power transformers including transformer tanks, bushings, enclosures, cores, coils, automatic load-tap changing equipment and accessories. Ensure power transformers and all equipment and accessories meet or exceed specified material and performance requirements and reference standards.

Submit manufacturer's instructions for the power transformers including special provisions required to install equipment components and system packages. Provide special notices that detail impedances, hazards and safety precautions.

Submit connection diagrams for power transformers, cores, coils and automatic load-tap changing equipment. Provide connection diagrams that indicate the relations and connections of the following items by showing the general physical layout of all controls, the interconnection of one system (or portion of system) with another, and internal tubing, wiring, and other devices.

Submit fabrication drawings for power transformers, transformer tanks, bushings, enclosures, cores, coils, automatic load-tap changing equipment and accessories. Provide fabrication drawings that consist of manufacturers original fabrication and assembly details to be performed at the factory for the project.

Submit engineered Equipment Foundation Drawings for power transformers that includes plan dimensions of foundations and relative elevations, equipment weight and operating loads, horizontal and vertical loads, horizontal and vertical clearances for installation, and size and location of anchor bolts.

2.1.2 Performance Requirements

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1 - CLASS 7240 UNIT SUBSTATION XFMR-SQUARE D SECONDARY UNIT SUBSTATION

LIQUID FILLED: LESS FLAMMABLE SEED OIL

6000 kva rated

PRIMARY VOLT: 34500 Y 150 KV BIL

SECONDARY VOLT: 13,800 / 7970 Y 75 KV BIL

STANDARD 60 HERTZ

IMPEDANCE: 6.5%

+/- 7.5% TOLERANCE CONDUCTOR: COPPER WINDINGS

TEMP: 120 DEGREES INSULATION CLASS 65 RISE OVER 30 AVG - 40 MAX AMB

TAPS: 2-2.5% FCAN, 2-2.5% FCBN ALTITUDE: STD. 3300 FEET MAXIMUM 67 DB

SOUND LEVEL

MODIFICATIONS:

KNAN RATING ONLY

DIAL TYPE THERMOMETER WITH CONTACTS LIQUID LEVEL GUAGE

PRESSURE VAC. GAUGE W/BLEEDER & CONTACTS DRAIN VALVE WITH SAMPLER DEVICE

PRESSURE RELIEF VALVE

PRESSURE RELIEF DIAPHRAGM WITH CONTACTS WINDING TEMP. INDICATOR WITH

CONTACTS RAPID RISE RELAY W/ SEAL-IN (AC)

NEMA 3R CONTROL BOX FOR CONTACTS FILL VALVE

NITROGEN TEST PORT

TWO GROUND LUGS #6-250 KCMIL ALUMINUM TRANSFORMER NAMEPLATE VACUUM TANK

UL LISTING

SHRINK WRAPPED FOR SHIPPING

COLOR: MUNSELL #7.0GY-3.29/1.5 W/TOUCH-UP MAXIMUM SDS VALUE = 2.25

SEISMIC ZONE 4 STANDARD EFFICIENCY

FACTORY MUTUAL NAMEPLATE XO BUSH GRND FLT PROT TAG SPARE PARTS LIST (NO

PRICING)

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HIGH VOLTAGE TERMINATIONS:

SIDEWALL MOUNTED ON LEFT (SEGMENT-2) FULL HEIGHT ATC 36 IN. DEEP

SIDE (END) ACCESSIBLE ONLY BOTTOM FEED CABLE ENTRY PHASE, SIDE AND TOP

BARRIERS UNGROUNDED SYSTEM WITH THREE INTERMEDIATE CLASS

27 KV ARRESTERS

6 PRIMARY 500 KCMIL COMPRESSION LUGS/PH

LOW VOLTAGE TERMINATIONS:

SIDEWALL MOUNTED ON RIGHT (SEGMENT-4) FULL HEIGHT ATC 36 IN. DEEP

SIDE (END) ACCESSIBLE ONLY BOTTOM FEED CABLE ENTRY EPOXY LOW VOLTAGE

BUSHINGS

TIN-PLATED COPPER BUSHING CONDUCTOR

06 SECONDARY 500 KCMIL COMPRESSION LUGS/PH

12 HOLE SPADE TERMINATION SECONDARY SPADE SUPPORTS

2.2 FABRICATION

2.2.1 Painting

After fabrication, clean and paint all exposed ferrous metal surfaces of the transformer and component equipment. Provide the transformer with the standard finish by the manufacturer for outdoor applications.

2.3 COMPONENTS

Provide transformers that include a core and coil assembly enclosed in a sealed airtight and oiltight tank, with accessories and auxiliary equipment as indicated and specified.

2.3.1 Tank

Provide transformer tank with walls, bottom, and cover fabricated from hot-rolled steel plate with cooling tubes or radiators vertically mounted to the side walls of the tank.

Provide transformer tank that is welded construction with rectangular base designed for rolling in the direction of the centerline of the bushing segments.

] Provide lifting, moving, and jacking facilities conforming to

IEEE C57.12.10.

TMueck Cloud+

TMueck Cloud+ Revision A

SECTION 33 73 00.00 40 Page 10

Provide transformer base that is designed to provide natural draft ventilation under the transformer tank when the transformer is placed on a flat concrete foundation. Undercoat the bottom of the transformer tank with a heavy rubberized protective sealing material at least (0.8 millimeter) 1/32 inch thick.

Weld cooling tubes into headers which in turn are welded into the transformer tank wall.

Provide a sealed-tank oil-preservation system that seals the interior of the transformer from the atmosphere throughout temperatures ranging to 100 degrees C. Provide constant gas and oil volume with internal gas pressure not exceeding 69 kilopascal positive or 55 kilopascal negative. 10 pounds per square inch, gage (psig) positive or 8-psig negative. Make provision for the relief of excessive internal pressure in the transformer tank, by the installation of a pressure relief valve.

Provide a completely assembled transformer that is designed to withstand, without permanent deformation, a pressure 25 percent greater than the maximum operating pressure of the sealed-tank oil-preservation system.

Provide spare mounting gaskets for all bushings, terminal chambers, handholes, and the gasket between the relief cover and flange on the pressure relief valve.

2.3.2 Bushings

Terminate primary windings of the transformer in cover-mounted high-voltage bushings. Terminate secondary windings of the transformer in sidewall bushings enclosed with throats or flanges that are an integral part of the transformer and terminal chambers for electrical connections to the underground distribution system. Provide same insulation class of bushings as the insulation class of the windings to which they are connected. Provide electrical characteristics of transformer bushings in accordance with IEEE C57.12.00. Provide dimensions of transformer bushings in accordance with IEEE C57.19.00.

2.3.3 Cores

Provide cores that are built up with laminated, nonaging, high-permeability, grain-oriented, cold-rolled, silicon sheet steel. Ensure laminations are coated with an insulating film or finish to minimize eddy-current losses. Ensure sheet steel conforms to ASTM A345.

2.3.4 Coils

Provide high- and low-voltage coil sections that consist of insulated copper conductors wound around the core. Provide coil sections that are

[concentric] [rectangular] to counteract forces incurred under short-circuit conditions. Provide coil sections with oil ducts to dissipate the heat generated in the windings. Provide coil sections that are electrically connected together and to the respective terminal bushings of the transformer. Ensure copper conductors in the high- and low-voltage coil sections conform to ASTM B48, Type B for applications involving edgewise bending.

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Provide primary winding of the transformer that is equipped with four 2.5 percent full-capacity taps, two above and two below normal voltage, brought out to an externally operated manual tap changer. Provide tap changer handles capable of being padlocked in each tap position and is operable when the transformer is deenergized.

2.3.5 Cooling Provisions

Provide radiators that are detachable all-welded hot-dipped galvanized steel construction, with top and bottom connections to the transformer tank wall. Provide tank wall top and bottom connections to radiators that are equipped with valves that permit removal of radiator without draining oil from the transformer tank.

2.3.7 Insulating Liquid

LIQUID FILLED: LESS FLAMMABLE SEED OIL

2.4 ACCESSORIES

Provide transformer accessories that include a liquid-level indicator, liquid-temperature indicator, pressure/vacuum gage, drain and filter valves, ground pads, and identification plate. Ensure transformer accessories and their locations conform to IEEE

C57.12.10. Locate the nitrogen fill valve above the transformers liquid level.

2.4.1 Space Heaters

Equip primary [and secondary] cable termination compartment with externally energized space heaters. Ensure heaters generate approximately

(40 watts per square meter) 4 watts per square foot at the outer surface area. Provide heaters that have a power density that does not exceed 4 watts per (645 square millimeter) square inch of heater element surface.

Provide heaters that are rated at 240-volts for connection to 120-volts.

Locate heaters at the lowest portion of each space to be heated. Cover terminals. Use thermostats to regulate the temperature.

Provide installed and operable heaters at the time of shipment so that the heaters can be operated immediately upon arrival at the site, during storage, or before installation. Provide connection locations that are marked prominently on drawings and shipping covers and that have temporary leads for storage operation. Ensure leads are easily accessible without having to remove shipping protection.

2.4.2 External Voltage Source

Group together all externally powered wiring to the switch as much as possible and connect to a terminal block which is marked with a laminated plastic nameplate having (5 millimeter) 3/16-inch high white letters on a red background as follows:

DANGER - EXTERNAL VOLTAGE SOURCE

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Provide externally powered wiring that includes unit space heaters temperature alarm devices and [instrumentation circuits.

2.4.3 Miscellaneous

Include the following transformer accessories, a liquid-level indicator, liquid-temperature indicator, pressure/vacuum gage, drain and filter valves, ground pads, and identification plate. Provide transformer accessories and their locations that conform to IEEE C57.12.10.

Transformer kilovolt-ampere (kVA) ratings are continuous and are based on temperature-rise tests. Do not exceed temperature limits when the transformer is delivering rated kVA output at rated secondary voltage in accordance with IEEE C57.12.00.

2.5 FACTORY TESTING

Conduct factory testing and submit Factory Test Reports in accordance with

IEEE C57.12.90, IEEE 62, ASTM D3612, and IEEE C57.12.00, Table 16. Ensure at a minimum all tests included in "Design Tests" and Routine and Other

Tests" paragraphs are completed. Maximum acceptable insulation power factor is 0.5 percent for mineral oil insulated transformers.

2.5.1 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 Representative (COR) 30 calendar days before scheduled test date. Notify Contracting Officer Representative (COR) 15 calendar days in advance of changes to scheduled date.

a. Test Instrument Calibration

(1) The manufacturer has a calibration program which assures that all applicable test instruments are maintained within rated accuracy.

(2) The accuracy is directly traceable to the National Institute of

Standards and Technology.

(3) Instrument calibration frequency schedule does not exceed 12 months for both test floor instruments and leased specialty equipment.

(4) Dated calibration labels are visible on all test equipment.

(5) Calibrating standard is of higher accuracy than that of the instrument tested.

(6) 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:

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

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

2.5.2 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 factory test reports (complete with test data, explanations, formulas, and results), in the same submittal package as the catalog data and drawings for each of the specified transformers. Perform design tests prior to the award of this contract.

a. Submit test reports certified and signed by a registered professional engineer.

b. Temperature rise: "Basically the same design" for the temperature rise test means a power transformer with the same coil construction, the same kVA, the same cooling type, the same temperature rise rating, and the same insulating liquid as the transformer specified.

c. Lightning impulse: "Basically the same design" for the lightning impulse dielectric test means a power transformer with the same BIL, the same coil construction, and a tap changer. Design lightning impulse tests includes the primary windings only of that transformer.

(1) IEEE C57.12.90, paragraph 10.3 LIGHTNING IMPULSE TEST PROCEDURES and IEEE C57.98.

(2) State test voltage levels.

(3) Provide photographs of oscilloscope display waveforms or plots of digitized waveforms with test report.

d. 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.

e. Pressure: "Basically the same design" for the pressure test means a power transformer with a tank volume within 30 percent of the tank volume of the transformer specified.

f. Short circuit: "Basically the same design" for the short circuit test means a power transformer with the same kVA as the transformer specified.

2.5.3 Routine and Other Tests

IEEE C57.12.00. Routine and other tests are performed by the manufacturer on [each of ] 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 are as follows:

a. Insulation-resistance tests of the windings

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b. Turns ratio tests

c. Polarity and phase rotation tests

d. No-load losses (NLL) and excitation current at rated voltage

e. Load losses (LL) and impedance voltage at rated current

f. Insulation power factor tests

g. Dielectric

(1) Impulse

(2) Applied voltage

(3) Induced voltage

h. Insulating liquid power factor tests

i. Insulating liquid acidity tests

j. Water-in-oil (Karl Fischer) tests

k. Leak

l. Dissolved gas analysis (DGA)

m. Sound tests

n. Bushing tests

TRANSFORMER TESTS:

------------------------- RATIO TEST POLARITY TEST

PHASE RELATION TEST NO-LOAD LOSS TEST

EXCITATION CURRENT TEST IMPEDANCE VOLTAGE TEST LOAD LOSS TEST

APPLIED POTENTIAL TEST INDUCED POTENTIAL TEST LEAK TEST

POWER FACTOR TEST RESISTANCE MEASUREMENT TEST

TEST REPORT REQUIRED (STD FORMAT) FACTORY QC IMPULSE TST HV ONLY

TEMPERATURE TEST: BASE RATING SOUND TEST: BASE RATING

KNAN (OIL/AIR) ONLY

NOTES:

SPECIFICATION NOT ON RECORD STANDARDS: IEEE C57.SERIES

SECTION 33 73 00.00 40 Page 15

SECONDARY LUGS AND FLEX CONNECTORS ARE NOT INCLUDED UNLESS LISTED ABOVE.

IF THIS TRANSFORMER IS EQUIPPED WITH REMOVABLE RADIATORS ***WITH VALVES***

THEY MAY BE SHIPPED SEPARATE

FROM THE TRANSFORMER, TO BE INSTALLED BY THE CUSTOMER AT THE JOB SITE.

FLUID FOR THE RADIATORS WILL BE SUPPLIED IN 55 GAL DRUMS

PART 3 EXECUTION

3.1 INSTALLATION

Install transformers as indicated and in accordance with the manufacturer's recommendations. Ground transformer tanks.

Provide installation drawings for the power transformer. Include complete details of equipment layout and design on the drawings.

3.2 FIELD QUALITY CONTROL

3.2.1 Acceptance Tests

Retain the services of the manufacturer's service representative to perform initial start-up, commissioning, and acceptance testing.

Manufacturer's service representative certification is required on all tests and reports submitted.

Disconnect primary winding of the transformer from the power supply, and ground the secondary windings of the transformer, before conducting insulation and high-voltage tests on primary windings.

Disconnect secondary winding of the transformer from the secondary feeder cables, and disconnect the primary winding of the transformer from the power supply and ground, before conducting insulation and high-voltage tests on secondary windings.

Give windings of the transformer an insulation-resistance test with a

5,000-volt insulation-resistance test set.

Apply tests for not less than 5 minutes and until 3 equal consecutive readings, 1 minute apart, are obtained. Record readings every 30 seconds during the first 2 minutes and every minute thereafter. Minimum acceptable resistance is 100 megohms.

Upon satisfactory completion of the insulation resistance tests, give the transformer windings an insulation power factor test and an excitation test. Maximum acceptable power factor is 0.5 percent. Excitation results vary due to the amount of iron and copper in the windings and are used for baselines only.

Conduct a turns ratio test on the transformer. Provide readings within

1/2 percent of each other.

Upon satisfactory completion of the above electrical tests, give the transformer the following oil tests: Power factor, neutralization number, SECTION 33 73 00.00 40 Page 16

Karl Fischer, Dissolved gas analysis, and dielectric. Provide results as follows:

Power Factor less than 0.5 percent at 20 degrees C

Karl Fischer less than 25 ppm at 20 degrees C

Neutralization Number less than 0.03 gm KOH/ml

Dielectric greater than 33kV

Dissolved Gas Combustibles less than 1000 ppm total

Final acceptance depends upon the satisfactory performance of the equipment under test. Do not energize transformer until recorded test data has been approved by the Contracting Officer (CO).

3.3 CLOSEOUT ACTIVITIES

3.3.1 Test Reports

Submit final test reports to the Contracting Officer Representative (COR) containing the results of all checks and tests, neatly cataloged and bound, to the Contracting Officer Representative (COR) before Final

Acceptance.

3.3.2 Maintenance

No less than 30 days prior to final testing and inspection, submit

Operation and Maintenance Manuals to the Contracting Officer

Representative (COR) for the following equipment:

a. Power transformers

b. Space heaters

-- End of Section --