### SPECIFICATIONS FOR THREE PHASE PAD

-MOUNTED DISTRIBUTION TRANSFORMERS
SUBMITTALS ® Shop Drawings: Include transformer ratings, features, accessories, compliance with the requirements specified herein, and conformance to the referenced standards and proposed testing to be conducted at the factory. Also include detailed and dimensioned plan, section and elevation drawings showing all components and features, recommended torque values for all electrical connections, complete wiring diagrams which designate factory and field wiring (if applicable), and complete equipment and material lists. ® Compliance Certification: Provide Manufacturers signed certification that the equipment meets all of the requirements of these specifications and the contract documents.


### CERTIFIED FACTORY TESTING All units shall be tested and certified for the following: ® No-load (Core) Losses at rated temperature (95°C). ® Full-load Winding Losses at rated temperature (95°C) and load. ® Percent Impedance Volts at rated temperature (95°C) and load. ® Excitation Current at 100% and 110% voltage. ® Winding Resistance measurement tests. ® Ratio tests for all tap settings. ® Polarity and Phase relation tests. ® Induced Potential tests. ® Full Wave and Reduced Wave Impulse tests. ® Applied Potential test. ® Insulation Power Factor test. In addition , the manufacturer shall provide certification upon request for all design and other tests listed in Table 17 of ANSI C57.12. 00 including verification that the design has passed Short Circuit Criteria per ANSI C57. 12.00 and C57.12.90.


### REFERENCE STANDARDS ® All three phase pad-mounted distribution transformers shall be designed, manufactured and tested in accordance with this specification and all applicable ANSI and NEMA Standards, latest revision. 

### SPECIFICATIONS FOR THREE PHASE PAD-MOUNTED DISTRIBUTION TRANSFORMERS
SUBMITTALS

CD Shop Drawings: Include transformer ratings, features, accessories, compliance with the requirements specified herein, and conformance to the referenced standards and proposed testing to be conducted atthe factory. Also include detailed and dimensioned plan, section and elevation drawings showing all components and features, recommended torque values for all electrical connections, complete wiring diagrams which designate factory and field wiring (ifapplicable), and complete equipment and material lists.

CD Compliance Certification: Provide Manufacturers signed certification that the equipment meets all ofthe requirements ofthese specifications and the contract documents. 

### CERTIFIED FACTORY TESTING All units shall be tested and certified forthe following:

CD No-load (Core) Losses at rated temperature (95°C).

CD Full-load Winding Losses at rated temperature (95°C) and load.

a Percent Impedance Volts at rated temperature (95°C) and load.

a Excitation Current at 100% and 110% voltage.

CD Winding Resistance measurementtests.

a Ratio tests for all tap settings.

CD Polarity and Phase relation tests.
GIl Induced Potential tests. • Full Wave and Reduced Wave Impulse tests.

CD Applied Potential test.

a Insulation Power Factor test. In addition, the manufacturer shall provide certification upon request for all design and othertests listed in Table 17 ofANSI C57.12.00 including verification that the design has passed Short Circuit Criteria perANSI C57.12.00 and C57.12.90. 

### REFERENCE STANDARDS

ED All three phase pad-mounted distribution transformers shall be designed, manufactured and tested in accordance with this specification and all applicable ANSI and NEMA Standards, latest revision.All characteristics, definitions, and terminology, except as specifically covered in this specification, shall be in accordance with the latest revision of the following ANSI and NEMA standards: IEEE Standard C57.12.00 - General Requirements for Liquid-Immersed Distribution, Power and Regulating Transformers.IEEE Standard C57.12.26 - Pad-Mounted, Compartmental-Type, SelfCooled, Three-Phase Distribution Transformers For Use with Separable Insulated High-Voltage Connectors, High Voltage, 34500GrdY/19920 Volts and Below; 2500 KVA and Smaller. IEEE Standard C57.12.28 - Pad

-Mounted Equipment

- Enclosure Integrity.IEEE Standard C57.12.90 - IEEE Standard Test Code for LiquidImmersed Distribution, Power, and Regulating Transformers and IEEE Guide for Short-Circuit Testing of Distribution and Power Transformers. IEEE Standard C57.91 - Guide for Loading Mineral-Oil-Immersed Overhead and Pad-Mounted Transformers Rated 500 KVA and Less with 65°C or 55°C Average Winding Rise. IEEE Standard C57.92 - Guide for Loading Mineral-Oil-Immersed Power Transformers Up to and including 100 MVA with 65°C or 55°C Average Winding Rise. ® The primary and secondary voltages and associated lightning impulse basic insulation levels (BIL) shall be in accordance with Table 1 below. ED All characteristics, definitions, and terminology, except as specifically covered in this specification, shall be in accordance with the latest revision ofthe following ANSI and NEMA standards: IEEE Standard C57.12.00

- General Requirements for Liquid-Immersed Distribution, Power and Regulating Transformers. IEEE Standard C57.12.26

- Pad-Mounted, Compartmental-Type, SelfCooled, Three-Phase Distribution Transformers For Use with Separable Insulated High-Voltage Connectors, High Voltage, 34500GrdY/19920 Volts and Below; 2500 KVA and Smaller. IEEE Standard C57.12.28

- Pad-Mounted Equipment
- Enclosure Integrity. IEEE Standard C57.12.90

- IEEE Standard Test Code for LiquidImmersed Distribution, Power, and Regulating Transformers and IEEE Guide for Short-CircuitTesting of Distribution and Power Transformers. IEEE Standard C57.91

- Guide for Loading Mineral-Oil-Immersed Overhead and Pad-Mounted Transformers Rated 500 KVA and Less with 65°C or 55°C Average Winding Rise. IEEE Standard C57.92

- Guide for Loading Mineral-Oil-Immersed Power Transformers Up to and including 100 MVA with 65°C or 55°C Average Winding Rise.

• The primary and secondary voltages and associated lightning impulse basic insulation levels (BIL) shall be in accordance with Table 1 below.Table I Transformer and Connector High-Voltage Ratings and Electrical Characteristics Electrical Characteristics of the Completely Assembled Transformer High-Voltage Connectors 60-Hz dry High-Voltage Rating Z. BIL one minute High-Voltage Ratings (volts) Minimum Phase-to-Ground' (kV) withstand BIL 3. (kV) /Phase-to-Phase (kV) (kV) Single High-Voltage 2400 60 8.3/14.4 95 34 4160 60 8.3/14.4 95 34 4800 60 8.3/14.4 95 34 7200 75 8.3/14.4 95 34 12000 95 8.3/14.4 95 34 12470 95 8.3/14.4 95 34 13200 95 8.3/14.4 95 34 13800 95 8.3/14.4 95 34 14400 95 8.3/14.4 95 34 16430 95 8.3/14.4 95 34 4160GrdY/2400 60 8.3/14.4 95 344 8320GrdY/4800 75 8.3/14.4 95 344 12470GrdY/7200 95 8.3/14.4 95 344 13200GrdY/7620 95 8.3/14.4 95 344 13800GrdY/7970 95 8.3/14.4 95 344. 22860GrdY/13200 125 15.2/26.3 125 404. 23900OrdY/13800 125 15.2/26.3 125 404. 24940GrdY/14400 125 15.2/26.3 125 404. 34500GrdY/19920 150 21.1/36.6 150 50 Series-Multiple High-Voltage 4160GrdY/2400 x 12470GrdY/7200 60 x 95 8.3/14.4 95 34 4160GrdY/2400 x 13200GrdY/7600 60 x 95 8.3/14.4 95 34 4800 x 13200OrdY/7620 60 x 95 8.3/14.4 95 34 8320GrdY/4800 x 24940GrdY/14400 75 x 125 15.2/26.3 125 40 12470GrdY/7200 x 24940GrdY/14400 95 x 125 15.2/26.3 125 40 13200GrdY/7620 x 24940GrdY/14400 95 x 125 15.2/26.3 125 40 23900GrdY/13800 x 34500GrdY/19920 125 x 150 21.1/36.6 150 50
1. For complete connector rating, see ANSI/IEEE 386.2. Transformers shall be suitable for connectors with phase-to-ground or phase-toground/phase-to-phase high-voltage ratings as listed. 3. Surge Arrester insulation coordination may require higher BIL on multiple connection windings than indicated to achieve a minimum protective level margin of 20%. 4. Grounded
-Wye connected transformers (non series

-multiple) 1000kVA and below may be designed with reduced insulation at the neutral and tested in accordance with C57.12.26 paragraph 6.2 for deadfront units. Table 1 Transformerand Connector High-Voltage Ratings and Electrical Characteristics
Electrical Characteristics ofthe CompletelyAssembled High-Voltage Connectors 1. Transformer High-Voltage Rating 2. BIL High-Voltage Ratings (volts) Minimum Phase-to-Ground

. (kV) BIL 3. (kV) /Phase-to-Phase (kV) Single High-Voltage 2400 60 8.3/14.4 95 4160 60 8.3/14.4 95 4800 60 8.3/14.4 95 7200 75 8.3/14.4 95 12000 95 8.3/14.4 95 12470 95 8.3/14.4 95 13200 95 8.3/14.4 95 13800 95 8.3/14.4 95 14400 95 8.3/14.4 95 16430 95 8.3/14.4 95 4160GrdY/2400 60 8.3/14.4 95 8320GrdY /4800 75 8.3/14.4 95 12470GrdY/7200 95 8.3/14.4 95 13200GrdY/7620 95 8.3/14.4 95 13800GrdY/7970 95 8.3/14.4 95 22860GrdY/13200 125 15.2/26.3 125 23900GrdY/13800 125 15.2/26.3 125 24940GrdY/14400 125 15.2/26.3 125 34500GrdY/19920 150 21.1/36.6 150 Series-Multiple High-Voltage 4160GrdY/2400 x 12470GrdY/7200 60 x 95 8.3/14.4 95 4160GrdY/2400 x 13200GrdY/7600 60 x 95 8.3/14.4 95 4800 x 13200GrdY/7620 60 x 95 8.3/14.4 95 8320GrdY/4800 x 24940GrdY/14400 75 x 125 15.2/26.3 125 12470GrdY/7200x 24940GrdY/14400 95 x 125 15.2/26.3 125 13200GrdY/7620x 24940GrdY/14400 95 x 125 15.2/26.3 125 23900GrdY/13800 x 34500GrdY/19920 125 x 150 21.1/36.6 150

1. For complete connector rating, see ANSIJlEEE 386. 2. Transformers shall be suitable for connectors with phase-to-ground or phase-toground/phase-to-phase high-voltage ratings as listed. 3. Surge Arrester insulation coordination may require higher BIL on multiple connection windings than indicated to achieve a minimum protective level margin of20%. 4. Grounded-Wye connected transformers (non series-multiple) 1000kVA and below may be designed with reduced insulation at the neutral and tested in accordance with C57.12.26 paragraph 6.2 for deadfront units. 60-Hz dry one minute withstand (kV)

34 34 34 34 34 34 34 34 34 34 344

. 344 344 344

. 344

. 404

. 404

. 404

. 50 34 34 34 40 40 40 50

### PRODUCTS

This Bid Request is for the following three phase pad-mounted distribution transformer equipment:
® Bid Item #1 : Two (2) 2000kVA @ 65 °C temperature rise, three phase pad-mounted transformer with a nominal primary voltage of 12,470GrdY/7,200V, and a nominal secondary voltage of 4,160GrdY/2,400V (Playtex Products and spare). ® Bid Item #2: One (1) 1000kVA @ 65°C temperature rise, three phase pad-mounted transformer with a nominal primary voltage of 12,47OGrdY/7,200V and a nominal secondary voltage of 4,160GrdY/2,400V (Playtex Apparel 3A & 3B).
® Bid Item #3: One (1) 300kVA @ 65°C temperature rise, three phase pad-mounted transformer with a nominal primary voltage of 12,47OGrdY/7,200V and a nominal secondary voltage of 4,160GrdY/2,400V (Court House). ® Bid Item #4: One (1) 150kVA @ 65°C temperature rise, three phase pad-mounted transformer with a nominal primary voltage of 12,47OGrdY/7,200V and a nominal secondary voltage of 4,160GrdY/2,400V (PNC Bank).

GENERAL All three phase pad-mounted distribution transformers shall be the completely factory fabricated compartmental type, mineral oil-immersed, self-cooled, with loop-feed dead-front primary winding connections and radial-feed dead-front secondary winding connections (for transformers with ratings less than or equal to 1000kVA), two (2) each 2 1/2% primary winding taps above and below nominal voltage rating with an external tap switch for de-energized operation, and provided with integral primary voltage protection in the form of appropriately sized load break bayonet type expulsion fuses in series with backup current limiting fuses under oil. 

### PRODUCTS
This BidRequestis for the following three phasepad-mounteddistribution transformer equipment:

• BidItem#1: Two (2) 2000kVA @ 65°C temperaturerise, threephase pad-mountedtransformerwith a nominalprimary voltage of 12,470GrdY17,200V, and a nominal secondaryvoltage of 4,160GrdY 

### 12,400V(PlaytexProducts and spare).

• BidItem#2: One (1) 1000kVA @ 

### 65°Ctemperaturerise, three phase pad-mountedtransformerwith a nominalprimaryvoltage of 12,470GrdY17,200V and a nominal secondaryvoltage of 4,160GrdYI2,400V (PlaytexApparel3A & 

### 3B).

• BidItem#3: One (1) 300kVA @ 

### 65°Ctemperaturerise, three phase pad-mountedtransformerwith a nominalprimaryvoltage of 12,470GrdY17,200V anda nominal secondaryvoltage of 4,160GrdY/2,400V (CourtHouse).

• BidItem#4: One (1) 150kVA @ 65°Ctemperaturerise, threephase pad-mountedtransformerwith a nominalprimaryvoltage of 12,470GrdY17,200V anda nominal secondaryvoltage of 4,160GrdY/2,400V (PNCBank).
GENERAL
All three phasepad-mounteddistributiontransformers shallbe the completelyfactory fabricated compartmentaltype, mineral oil-immersed, self-cooled, with loop-feeddead-frontprimarywinding connections and radial-feeddead-front secondarywinding connections (fortransformers with ratings less than orequalto IOOOkVA), two (2) each2 112% primary windingtaps above andbelownominal voltageratingwith an externaltap switchfor de-energizedoperation, andprovidedwith integralprimary voltageprotection inthe form ofappropriately sizedloadbreakbayonettype expulsionfuses in series withbackup currentlimitingfuses underoil.

### MANUFACTURES QUALIFICATIONS

Only Firms experienced in manufacturing equipment of the types and capacities indicated that are able to show evidence of continuous engagement in the manufacture of pad-mounted transformers for the last five (5) years will be considered.
WARRANTY All three phase pad-mounted transformers shall be warranted to be free from defects in material and workmanship for a period of twelve (12) months from the date of installation or eighteen (18) months from the date of delivery whichever is longer.
AWARD OF BID The City of Dover reserves the right not to award the Contract to the lowest bidder, based upon delivery schedule, loss evaluation, qualifications of the bidder/manufacturer, technical issues encountered during bid evaluation, compliance with the City's Specifications and Contract Documents, and the Terms and Conditions of Sale.
RATINGS ® The average winding temperature rise above a 30°C 24 hour average with a 40°C peak ambient temperature, when tested at the transformer rating, shall not exceed 65°C. ® The percent impedance voltage, as measured on the rated nominal voltage connection, shall be per IEEE C57.12.26, paragraph 5.1. Manufacturing tolerance for impedance values shall be per ANSI C57.12.00, Table 19.

KVA Rating Low-Voltage Rating < 4,160 GrdY/2400V With High Voltage Rating shown below < 150 kV BIL 200 kV BIL 250 kV BIL 

### 45-75 1.00-5.00 7.25 7.75 112.5 - 300 1.20-6.0 7.25 7.75 500 1.50-7.00 7.25 7.75 750 - 2500 5.75 7.25 7.75 Table 2 Percent Impedance Voltage 

### MANUFACTURES QUALIFICATIONS OnlyFirms experiencedin manufacturing equipment ofthe types and capacities indicatedthat are able to show evidence ofcontinuous engagementinthe manufacture ofpad-mountedtransformers for the last five (5) years willbe considered. WARRANTY All three phasepad-mountedtransformers shallbe warrantedto be free from defects in material andworkmanship for aperiod oftwelve (12) months from the date ofinstallation oreighteen (18) months from the date of delivery whichever is longer. AWARD OF BID The City ofDoverreserves the right notto awardthe Contractto the lowest bidder,basedupon delivery schedule, loss evaluation, qualifications ofthe bidder/manufacturer, technical issues encountered duringbidevaluation, compliance withthe City's Specifications and ContractDocuments, andthe Terms and Conditions ofSale. RATINGS

€I The average winding temperature rise above a 30°C 24 hour average with a 40°C peak ambient temperature, when tested at the transformer rating, shall not exceed 65°C.

€I The percent impedance voltage, as measured on the rated nominal voltage connection, shall be per IEEE C57.12.26, paragraph 5.1. Manufacturing tolerance for impedance values shall be per ANSI C57.12.00, Table 19. Table 2 ercen mpe ance o age 

### P tid V It 

## KVA low-Voltage Rating**~** 4,160 GrdY/2400V Rating With High Voltage Rating shown below 

### < 150 kV Bll 200 kV Bll 

### ?"n I," Dl1 45-75 1.00
- 5.00 7.25 7.75 112.5
- 300 1.20
- 6.0 7.25 7.75 500 1.50
- 7.00 7.25 7.75 750
- 2500 5.75 7.25 7.75

### CORE AND COIL ASSEMBLY

® The core and coils shall be vacuum processed to ensure maximum penetration of insulating fluid into the coil insulation system. The transformer shall be filled with preheated, filtered and degassed insulating fluid. The core shall be manufactured from burr-free, grain-oriented or amorphous silicon steel and shall be precisely stacked to eliminate gaps in the corner joints. The winding coils shall be insulated with diamond pattern, epoxy-coated insulating paper, which shall be thermally cured under pressure to ensure proper bonding of the winding conductor and paper insulation. ® Copper primary and secondary windings are preferred. Substitution of aluminum windings may be considered if they provide a substantial cost savings when transformer first cost and loss-evaluated cost are considered. ® The transformer low voltage windings shall have a three phase, 60 Hz rating equivalent to the transformer primary windings.
GENERAL Sealed pad-mounted transformer tanks shall be provided with the necessary cooling radiators and individual high voltage and low voltage cable compartments separated by a steel barrier. The enclosure shall have no exposed removable parts, no exposed openings, be tamper proof, weather proof, and suitable for pad mounting. Cable compartment doors, door-sills and hoods shall be removable. TANK AND TERMINAL COMPARTMENT ® The terminal compartment depth shall be in accordance with Figure 7 of ANSI C57.12.26. ® Doors: Separate doors shall be provided for high and low voltage cable terminal compartments with mechanical interlocks so that access to the high voltage compartment is prevented unless the low voltage compartment is open

. Doors to include open position door-stops and stainless steel hinges and pins. The low voltage compartment door shall incorporate a three-point locking mechanism to assure a tight and secure door closing, and latching handle with provisions for a single padlock to secure both compartments. In addition to the regular locking provision, allaccess doors and hoods shall be secured by a recessed, captive pentahead bolt that meets the dimensions set forth in ANSI C57. 12.28. 

### COREAND COILASSEMBLY

• The core and coils shall be vacuum processed to ensure maximum penetration of insulating fluid into the coil insulation system. The transformer shall be filled with preheated, filtered and degassed insulating fluid. The core shall be manufactured from burr-free, grain-oriented or amorphous silicon steel and shall be precisely stacked to eliminate gaps in the cornerjoints. The winding coils shall be insulated with diamond pattern, epoxy-coated insulating paper, which shall be thermally cured under pressure to ensure proper bonding ofthe winding conductor and paper insulation.

• Copper primary and secondary windings are preferred. Substitution of aluminum windings may be considered ifthey provide a substantial cost savings when transformerfirst cost and loss-evaluated cost are considered.

• The transformer low voltage windings shall have a three phase, 60 Hz rating equivalent to the transformer primary windings. GENERAL Sealed pad-mounted transformer tanks shall be provided with the necessary cooling radiators and individual high voltage and lowvoltage cable compartments separated by a steel barrier. The enclosure shall have no exposed removable parts, no exposed openings, be tamper proof, weather proof, and suitable for pad mounting. Cable compartment doors, door-sills and hoods shall be removable. TANK AND TERMINAL COMPARTMENT

• The terminal compartment depth shall be in accordance with Figure 7 of ANSI C57.12.26.

• Doors: Separate doors shall be provided for high and low voltage cable terminal compartments with mechanical interlocks so that access to the high voltage compartment is prevented unless the lowvoltage compartment is open. Doors to include open position door-stops and stainless steel hinges and pins. The low voltage compartment door shall incorporate a three-point locking mechanism to assure a tight and secure door closing, and latching handle with provisions for a single padlock to secure both compartments. In addition to the regular locking provision, all access doors and hoods shall be secured by a recessed, captive pentahead bolt that meets the dimensions setforth in ANSI C57.12.28.® The tank must be welded using precision cut, cold-rolled steel and equipped with extra-heavy duty, welded-in-place lifting lugs and jacking pads. The tank base must be designed to allow skidding or rolling in any direction.
® The transformer shall be of sealed tank construction with sufficient strength to withstand a pressure of 7 psig without permanent distortion, and 15 psig without rupturing or affecting cabinet security per ANSI C57.12.26 paragraph 7.5.2. The tank shall include a pressure relief valve with a flow at 15 psig of 35 SCFM minimum, or as required to meet the listing of the insulating fluid. The venting and sealing characteristics shall be as follows: 3 Cracking Pressure: 10 psig ± 2 psig 3 Resealing Pressure: 6 psig minimum 3 Zero leakage from resealing pressure to -8 psig ® The tank shall be cleaned with an alkaline cleaning agent to remove grease and oil. An iron phosphate coating shall then be chemically bonded to the metal to assure coating adhesion and to retard corrosion. The tank shall be primed with an electrodeposited powder epoxy to provide a barrier against moisture, salt, and corrosives

. The tank shall then be coated with two coats of Standard Munsell No . 7GY3.29/1.5 Green

. The tank coating shall meet all requirements in ANSI C57.12.28 including: 3 Salt Spray Test 3 Crosshatch Adhesion Test 3 Humidity Test 3 Impact Test 3 Oil Resistance Test 3 Ultraviolet Accelerated Weathering Test 3 Abrasion Resistance - Taber Abraser ® The transformers tanks shall have a catalytic epoxy coal tar composition applied to the bottom for extra protection against corrosion. ® The pad-mounted equipment shall meet the requirements for tamper resistance set forth in ANSI C57.12.28 including but not limited to the pry test, pull test, and wire probe test. ® The tank shall be complete with an anodized aluminum or stainless steel laser engraved or stamped nameplate. This nameplate shall meet ANSI C57.12.00 for Nameplate B. e The tank must be welded using precision cut, cold-rolled steel and equipped with extra-heavy duty, welded-in-place lifting lugs and jacking pads. The tank base must be designed to allow skidding or rolling in any direction.

e The transformer shall be ofsealed tank construction with sufficient strength to withstand a pressure of7 psig without permanent distortion, and 15 psig without rupturing or affecting cabinet security perANSI C57.12.26 paragraph 7.5.2. The tank shall include a pressure reliefvalve with a flow at 15 psig of35 SCFM minimum, or as required to meet the listing ofthe insulating fluid. The venting and sealing characteristics shall be as follows: ./ Cracking Pressure: 10 psig 

### ±2 psig ./ Resealing Pressure: 6 psig minimum ./ Zero leakage from resealing pressure to -8 psig

e The tank shall be cleaned with an alkaline cleaning agent to remove grease and oil. An iron phosphate coating shall then be chemically bonded to the metal to assure coating adhesion and to retard corrosion. The tank shall be primed with an electrodeposited powder epoxy to provide a barrier against moisture, salt, and corrosives. The tank shall then be coated with two coats of Standard Munsell No. 7GY3.29/1.5 Green. The tank coating shall meet all requirements in ANSI C57.12.28 including: ./ Salt Spray Test ./ Crosshatch Adhesion Test ./ Humidity Test ./ Impact Test ./ Oil Resistance Test ./ Ultraviolet Accelerated Weathering Test ./ Abrasion Resistance
- TaberAbraser

e The transformers tanks shall have a catalytic epoxy coal tar composition applied to the bottom for extra protection against corrosion.

e The pad-mounted equipment shall meet the requirements for tamper resistance set forth in ANSI C57.12.28 including but not limited to the pry test, pull test, and wire probe test.

o The tank shall be complete with an anodized aluminum or stainless steel laser engraved or stamped nameplate. This nameplate shall meet ANSI C57.12.00 for Nameplate B.

### INSULATING FLUID ® The dielectric coolant in the transformer must be new, highly refined and inhibited 10 C mineral oil and meet the minimum requirements as specified in Table 1, "Functional Property Requirements", of ASTM D3487 and ANSI C57.106. ® All transformer oil must be bulk tested for polychlorinated biphenyls (PCBs) per ASTM D4059 and certified as having no detectable level ofPCBs. The pad- mounted transformers shall be certified and labeled nonPCB, and provided with a certified test report to ASTM standards for documenting insulating oil, color, acidity, dielectric strength, interfacial tension, visual appearance, and water content.


### HIGH VOLTAGE COMPARTMENT ® The voltage provided and the basic insulation level (BIL) shall be in accordance with Table 1. ® The pad mounted transformers shall have primary winding connections constructed for dead front loop feed operation and supplied with six (6)universal deep well bushing assemblies and six (6) universal 200A loadbreak bushing inserts capable of accepting ESNA standard, 15kV class, 200A load break elbows conforming to ANSI/IEEE 386. The bushing well assemblies shall be externally removable and clamped and have an integral molded semi-conductive shield. These assemblies, with the appropriate 200A load-break bushing inserts shall allow for the use of bushing position elbow-type surge arrestors. ® The pad-mounted transformers shall have separate HV and LV winding external fully insulated neutral bushings provided with removable grounding connections between the HV and LV neutral bushings and the NEMA standard transformer ground pad to facilitate transformer testing. ® The bushing heights shall be in accordance with Figure 7 of ANSI C57.12.26. ® Cable accessory parking stands shall be provided and shall be located such that the separable insulated load break connectors that are designed for energized operation with the transformer in its permanent location can be operated by hot-line tools. 

### INSULATINGFLUID

• The dielectric coolant in the transformer must be new, highly refined and inhibited 10 C mineral oil and meet the minimum requirements as specified in Table 1, "Functional Property Requirements", ofASTM D3487 and ANSI C57.106.

• All transformer oil must be bulk tested for polychlorinated biphenyls (PCBs) perASTM D4059 and certified as having no detectable level of PCBs. The pad- mounted transformers shall be certified and labeled nonPCB, and provided with a certified test report to ASTM standards for documenting insulating oil, color, acidity, dielectric strength, interfacial tension, visual appearance, and water content. 

### HIGHVOLTAGE COMPARTMENT

• The voltage provided and the basic insulation level (BIL) shall be in accordance with Table 1.

• The pad mounted transformers shall have primary winding connections constructed for dead front loop feed operation and supplied with six (6) universal deep well bushing assemblies and six (6) universal 200A loadbreak bushing inserts capable of accepting ESNA standard, 15kV class, 200A load break elbows conforming to ANSIIIEEE 386. The bushing well assemblies shall be externally removable and clamped and have an integral molded semi-conductive shield. These assemblies, with the appropriate 200A load-break bushing inserts shall allow for the use of bushing position elbow-type surge arrestors.

o The pad-mounted transformers shall have separate HV and LV winding external fully insulated neutral bushings provided with removable grounding connections between the HV and LV neutral bushings and the NEMA standard transformer ground pad to facilitate transformer testing.

o The bushing heights shall be in accordance with Figure 7 of ANSI C57.12.26.

e Cable accessory parking stands shall be provided and shall be located such that the separable insulated load break connectors that are designed for energized operation with the transformer in its permanent location can be operated by hot-line tools.

### LOW VOLTAGE COMPARTMENT

® The voltage provided and the basic insulation level (BIL) shall be in accordance with Table 1. ® The pad mounted transformers with ratings less than or equal to 1000kVA shall have secondary winding connections constructed for radial-feed dead-front operation and supplied with three (3) universal deep well bushing assemblies and three (3) universal 200A load

-break bushing inserts capable of accepting ESNA standard, 15kV class, 200A load break elbows conforming to ANSI/IEEE 386

. The bushing well assemblies shallbe externally removable and clamped and have an integral molded semiconductive shield. ® Cable accessory parking stands shall be provided and shall be located such that the separable insulated load break connectors that are designed for energized operation with the transformer in its permanent location can be operated by hot-line tools. ® The transformer low voltage phase and neutral bushings for the units rated 2000kVA shall be one-piece epoxy, porcelain, or fiberglass polyester material with silver-plated copper flat pad terminal spades and NEMA standard 4-hole drilling. The low-voltage bushings shall be the bolted type with external clamping. The low-voltage bushing terminals shall be in accordance with Figure 9 of ANSI C57.12.26. ® If the transformer is equipped with threaded stud-type phase and neutral terminals, these terminals shall be provided with silver-plated copper flat pad stud connectors with NEMA standard 4-hole drilling installed for the phase and neutral terminals. ® The configuration of the transformer low voltage bushings shall be in accordance with ANSI C57.12.26, Figure 8. The secondary bushings shall be replaceable utilizing the access provided or through the removal of the sealed tank access cover. ® The bushing heights shall be in accordance with Figure 7 of ANSI C57.12.26. 

### PROTECTION ® The over-current protection scheme provided with the transformer shall consist of the following attributes. If for any reason a protection scheme other than the following is required it shall be clearly stated as an exception on the bid. 

### LOWVOLTAGE COMPARTMENT

EI The voltage provided and the basic insulation level (BIL) shall be in accordance with Table 1.

EI The pad mounted transformers with ratings less than or equal to 1000kVA shall have secondary winding connections constructed for radial-feed dead-front operation and supplied with three (3) universal deep well bushing assemblies and three (3) universal 200A load-break bushing inserts capable ofaccepting ESNA standard, 15kV class, 200A load break elbows conforming to ANSIIIEEE 386. The bushing well assemblies shall be externally removable and clamped and have an integral molded semiconductive shield.

EI Cable accessory parking stands shall be provided and shall be located such that the separable insulated load break connectors that are designed for energized operation with the transformer in its permanent location can be operated by hot-line tools.

• The transformer low voltage phase and neutral bushings for the units rated 2000kVA shall be one-piece epoxy, porcelain, orfiberglass polyester material with silver-plated copper flat pad terminal spades and NEMA standard 4-hole drilling. The low-voltage bushings shall be the bolted type with external clamping. The low-voltage bushing terminals shall be in accordance with Figure 9 ofANSI C57.12.26.

• If the transformer is equipped with threaded stud-type phase and neutral terminals, these terminals shall be provided with silver-plated copper flat pad stud connectors with NEMA standard 4-hole drilling installed for the phase and neutral terminals.

• The configuration of the transformer low voltage bushings shall be in accordance with ANSI C57.12.26, Figure 8. The secondary bushings shall be replaceable utilizing the access provided or through the removal ofthe sealed tank access cover.

• The bushing heights shall be in accordance with Figure 7 ofANSI C57.12.26. 

### PROTECTION

• The over-current protection scheme provided with the transformer shall consist ofthe following attributes. Iffor any reason a protection scheme other than the following is required it shall be clearly stated as an exception on the bid.® The transformer primary shall include load break Bay-O-Net fuse assemblies with flapper valves and drip shields to minimize oil spillage. Over-current protection shall be provided by Bay-O-Net expulsion fuses mounted in series with partial range under-oil ELSP (or equivalent) current-limiting fuses with an interrupting rating of 50,000 A. This fusing scheme is intended to provide full range protection for system reliability and safety of operating personnel where distribution primary single phase to ground fault currents may exceed 3500A. 

### ACCESSORIES The following standard accessories shall be provided: ® Four (4) each lifting lugs and jacking plates. ® Penta-head bolted doors and hoods w/ bolt guard ® 1.0" upper fill plug ® 1.0" drain/sampling valve in the low voltage compartment ® Automatic pressure relief device ® 20" deep HV and LV terminal compartments ® Stainless steel NEMA Standard two hole ground pads The following optional accessories shall be provided:

• Liquid level gauge ® Pressure/vacuum gauge ® Dial type thermometer ® High voltage (and low voltage where applicable) 200A universal bushing well inserts ® Ground connectors ® Touch-up paint



### LOSS EVALUATION The following penalties will be assigned to transformer losses during the bid evaluation process: ® $4,000/kW for No-load (Core) losses * $1 000/kW for full load (OA) winding losses.
HAZARD ALERTING SIGNS • The transformer primary shall include load break Bay-a-Netfuse assemblies with flapper valves and drip shields to minimize oil spillage. Over-current protection shall be provided by Bay-O-Net expulsion fuses mounted in series with partial range under-oil ELSP (or equivalent) current-limiting fuses with an interrupting rating of50,000 A. This fusing scheme is intended to provide full range protection for system reliability and safety ofoperating personnel where distribution primary single phase to ground fault currents may exceed 3500A. 

### ACCESSORIES The following standard accessories shall be provided:

• Four (4) each lifting lugs and jacking plates. • Penta-head bolted doors and hoods w/ bolt guard • 1.0" upperfill plug • 1.0" drain/sampling valve in the low voltage compartment • Automatic pressure relief device • 20" deep HV and LV terminal compartments • Stainless steel NEMA Standard two hole ground pads The following optional accessories shall be provided:

• Liquid level gauge • Pressure/vacuum gauge • Dial type thermometer • High voltage (and lowvoltage where applicable) 200A universal bushing well inserts

III Ground connectors • Touch-up paint



### LOSS EVALUATION
The following penalties will be assigned to transformer losses during the bid evaluation process:

III $4,000/kW for No-load (Core) losses

• $1OOO/kW forfull load (OA) winding losses. 

### HAZARD ALERTING SIGNS® The exterior of the pad-mounted enclosure shall be provided with "WARNING

-KEEP OUT-HAZARDOUS VOLTAGE INSIDE- CAN SHOCK, BURN OR CAUSE DEATH" signs. ® The interior of the pad-mounted enclosure shall be provided with a "DANGER-HAZARDOUS VOLTAGE-FAILURE TO FOLLOW THESE INSTRUCTIONS WILL LIKELY CAUSE SHOCK, BURNS OR DEATH" sign. The text will further indicate that operating personnel must know and obey the employer's work rules, know the hazards involved, and use proper protective tools to work on this equipment.


### MISCELLANEOUS Operation and Maintenance Manual: provide 8-1/2" x 11" bound manual including all shop drawing information, spare parts list with model numbers, local service facilities, and recommended maintenance and testing procedures.


### DELIVERY Each individual pad-mounted transformer unit shall be bonded or bolted to a wooden pallet made with "4 by 4 lumber" minimum. To facilitate the City's unloading from the delivery truck and handling by fork-lift or aerial lifts/derrick and slings, the pad-mounted transformers must be shipped on an open type truck. Each unit shall be protected from paint damage while in transit.


## Transformers Shipped such that they cannot be lifted in

this manner will not be accepted. • The exterior ofthe pad-mounted enclosure shall be provided with "WARNING·KEEP OUT·HAZARDOUS VOLTAGE INSIDE· CAN SHOCK, BURN OR CAUSE DEATH" signs.

• The interior ofthe pad-mounted enclosure shall be provided with a "DANGER-HAZARDOUS VOLTAGE-FAILURE TO FOLLOWTHESE INSTRUCTIONS WILL UKEL Y CAUSE SHOCK, BURNS OR DEATH" sign. The text will further indicate that operating personnel must know and obey the employer's work rules, know the hazards involved, and use proper protective tools to work on this equipment. 

### MISCELLANEOUS Operation and Maintenance Manual: provide 8-1/2"x 11" bound manual including all shop drawing information, spare parts listwith model numbers, local service facilities, and recommended maintenance and testing procedures. 

### DELIVERY
Each individual pad-mounted transformer unit shall be bonded or bolted to a wooden pallet made with "4 by 4 lumber" minimum. To facilitate the City's unloading from the delivery truck and handling by fork-lift or aerialliftslderrick and slings, the pad-mounted transformers must be shipped on an open type truck. Each unit shall be protected from paint damage while in transit.


## Transformers shipped such thatthey cannot be lifted in this manner

## will not be accepted.