33-APPENDIX H - COT Transformer Specifications.pdf

APPENDIX H

CITY OF TALLAHASSEE SPECIFICATIONS

FOR SINGLE PHASE POLETYPE, SINGLE PHASE PADMOUNTED

AND THREE PHASE PADMOUNTED TRANSFORMERS

10/2/2020

1.0.0 ENGINEERING DATA:

1.0.1 Each bidder shall submit the following data on each category of Distribution Transformers on the attached

PROPOSAL FORM:

a. Name of Transformer Manufacturer

b. A statement that the proposed Transformers conform to the City specifications or a statement indicating the exceptions to the specifications.

c. A statement that the proposed Transformers conform to:

o Amended 2016 DOE Transformer Efficiency Standards o Liquid Dielectric requirements of EPA 40 CFR Part 761 o Testing requirements of this specification per sections: 9.1.9, 10.4.0, and 11.3.11.

d. Dimensional data with bushing locations and weight for each bid item.

e. Performance data for bid evaluation for each bid item as follows:

(1) Average no load (core) losses (watts at 85 o Celsius).

(2) Average Load (winding) losses (watts at 85 o Celsius).

(3) Average Total Losses watts at 85 o Celsius).

1.0.2 The City Electric Department, Power Engineering Division, shall have final determination as to the specifications of the above transformers.

2.0.0 Pricing Evaluation:

2.0.1 Pricing will be evaluated based on Total Transformer Owning Cost (TTOC) which is as follows:

A Total Transformer Owning Cost (TTOC) of each item will be computed according to the following formula:

For the poletype transformer and single phase padmounts:

Transformer bid price plus $5.36/watt of no load losses plus $1.48/watt of load losses equals TTOC;

For the three phase padmounts:

Transformer bid price plus $5.36/watt of no load losses plus $2.35/watt of load losses equals TTOC;

3.0.0 EFFICIENCY REQUIREMENTS

3.0.1 All transformers shall satisfy the requirements of the United States Department of Energy (DOE) Distribution Transformer Standards.

3.0.2 For the purpose of this bid the Amended 2016 DOE Transformer Efficiency Standards shall be the design criteria.

4.0.0 QUALITY ASSURANCE

4.0.1 All transformers shall be manufactured in North America.

4.0.2 All transformer manufacturers shall be registered as an ISO9001:2008 CERTIFIED manufacturer. The manufacturer shall supply documentation to attest to this registration.

4.0.3 Transformers shall be tested in accordance with ANSI/IEEE C57.12.90-2010.

5.0.0 CERTIFIED TEST REPORTS AND SUBMITTAL DATA REQUIRED

5.0.1 An outline drawing showing complete dimensional data, accessories and estimated weight shall be submitted for approval within two weeks of bid award. Drawing must be approved by the City of Tallahassee Electric Department prior to manufacture of transformer.

5.0.2. At the time of delivery, the manufacturer shall provide a certified test report for all transformers in a given order, indicating the actual loss data for each unit delivered. Certified test reports shall be mailed to the address in paragraph 5.1.3 of this specification.

5.0.3 Approval drawings and certified test reports shall be sent to:

City of Tallahassee, Electric Dept.

Power Engineering Division

2602 Jackson Bluff Rd.

Tallahassee, FL 32304

Attn.: Garret Yount

6.0.0 QUALITY CONTROL

6.0.1 Upon receipt, all transformers will be visually inspected by City of Tallahassee personnel to determine compliance with the specifications.

6.0.2 All losses quoted are the guaranteed average for all units contained in an order. However, no individual unit shall exceed the following tolerances:

a. The measured NO LOAD LOSSES on any unit shall not exceed the quoted NO LOAD LOSSES by more than 10%.

b. The measured TOTAL LOSSES on any unit shall not exceed the quoted TOTAL LOSSES by more than 6%.

7.0.0 PENALTY FOR NON-CONFORMING TRANSFORMERS

7.0.1 Should any transformer fail to conform to the specifications in any way, then, at the option of The City of

Tallahassee Electric Department, the vendor shall replace the non-conforming transformer with a suitable transformer and bear all associated costs; or have the initial bid price reduced by a penalty charge calculated in accordance with paragraph 7.0.3 below.

7.0.2 Should any transformer fail to conform to Amended 2016 DOE Transformer Effiecency Standards or contain PCB’s as defined by EPA 40 CFR Part 761 then the vendor shall replace the non-conforming transformer with a suitable transformer as so defined by The City of Tallahassee Electric Department and bear all associated costs.

7.0.3 Calculation of the PENALTY CHARGE in dollars per unit shall be as follows:

Penalty Charge (in dollars) = {(Equivalent First Cost of Actual Losses) - (Equivalent First Cost of Quoted

Losses)}

7.0.4 In the event that a given order does not exceed the average losses as quoted, but any individual transformer exceeds the tolerances as specified in paragraph 6.0.2 a and b, then the penalty charge shall be deducted from the bid price of that unit.

7.0.5 In the event the average losses for a given transformer order exceeds the quoted average, then the penalty charge shall be calculated in accordance with paragraph 7.0.3 based on the difference of the actual average losses and the quoted average losses and shall be deducted from each unit in the order.

7.0.6 In no case will the penalty charge exceed the bid price of the non-conforming unit.

8.0.0 WARRANTY

8.0.1 The manufacturer shall warrant each individual transformer for materials and workmanship for a minimum period of eighteen months after delivery or one year after it is put into service whichever comes first.

9.0.0 SINGLE PHASE POLETYPE TRANSFORMERS

9.0.1 This specification covers the electrical and mechanical requirements for single phase polemount transformers, sixty cycle, oil filled, self cooled, overhead type distribution transformers, in various kVA ratings (500KVA and smaller) for use on an overhead electric distribution system.

9.0.2 All transformers shall conform to the latest issue of the following American National Standards Institute

(ANSI) / Institute of Electrical and Electronics Engineers (IEEE) documents:

ANSI/IEEE C57.12.00-2010, IEEE STANDARD FOR GENERAL REQUIREMENTS FOR LIQUID-

IMMERSED DISTRIBUTION, POWER, AND REGULATING TRANSFORMERS

ANSI/IEEE C57.12.20-2011, IEEE STANDARD FOR OVERHEAD-TYPE DISTRIBUTION

TRANSFORMERS, 500 KVA AND SMALLER: HIGH VOLTAGE, 34,500 VOLTS AND BELOW: LOW

VOLTAGE 7970/13800Y VOLTS AND BELOW

ANSI/IEEE C57.12.90-2010, IEEE STANDARD TEST CODE FOR LIQUID-IMMERSED DISTRIBUTION

POWER, AND REGULATING TRANSFORMERS

9.0.3 All ratings shall be based on not exceeding a 65 degree C. winding temperature rise. The high voltage Basic Lightning Insulation Impulse Level (BIL) shall be 95 kV.

9.0.4 High voltage: 7200/12470 Grd.Y

9.0.5 Low voltage: as indicated on the request for quotation.

9.0.6 Size (kVA): as indicated on the request for quotation.

9.1.0 DESIGN AND CONSTRUCTION

9.1.1 Transformers shall be constructed in accordance with ANSI/IEEE C57.12.20, unless exception is taken by these specifications. Transformers shall be Class OA and shall have a sealed-tank oil preservation system.

9.1.2 Tank Construction, Accessories and Finish

a. The transformer tank shall be of all welded steel construction, which when fully assembled shall form an oil-tight sealed unit.

b Transformers shall be equipped for single position pole or platform mounting. Mounting hardware shall be constructed and positioned in accordance with ANSI/IEEE C57.12.20

c. Lifting lugs shall be provided to allow the safe handling and lifting of the complete transformer unit when filled with insulating fluid.

d. Pressure relief shall be provided in accordance with paragraph 7.2.5.1 or 7.2.5.2 of ANSI/IEEE

C57.12.20. If automatic pressure relief valve device is used it shall contain the following:

• A pull ring for hot stick or manual operation

• Brass body material

• Viton seal material

• Flow rate to be between 40 SCFM and 60 SCFM @15 PSIG.

• The device shall not have an indicating "pop-off" cover.

e. All exterior bolts, nuts, clamps and non-painted metallic hardware shall be either stainless steel or of a non-corrosive galvanized finish.

f. Tank Bottom shall be provided with scuff protection recessed rim.

9.1.3 The tank coating shall be high grade paint applied with a powder coated finish process. Process shall provide a protective coating which is exceptionally serviceable in areas of direct sunlight and high humidity.

The color shall be light gray, No. 70, Munsell notation 5BG 7.0/0.4.

9.1.4 The transformer size (kVA) and Secondary Voltages of 120/208V or 277/480V shall be clearly and permanently marked on the front of the tank below the secondary bushings at the bottom of the tank.

Secondary Voltages of 120/240V shall not be permanently marked on the front of the transformer.

Markings shall be with fade resistant material. The size of the lettering shall be as specified in section

7.3.5 of ANSI/IEEE C57.12.20.

9.1.5 Bushings

a The transformer shall have two cover mounted porcelain high voltage bushings. The high voltage bushings shall have electrical characteristics as required in paragraph 7.1.2.1 and listed in Table 6 of ANSI/IEEE C57.12.20, for the 95 kV BIL insulation class.

b The low voltage terminals size shall be in accordance with Table 9 of ANSI/IEEE C57.12.20. Low voltage bushings shall be of the side wall type and mounted singly. Low voltage bushings shall be constructed of porcelain or epoxy and properly gasketed.

c. The equipment number, location and arrangement of bushings shall be as shown in applicable

Tables and Figures of ANSI/IEEE C57.12.20.

d. The color of all bushings shall match Light Gray No. 70, Munsell notation 5BG 7.0/0.4.

9.1.6 Dielectric Oil

9.1.6.1 Transformers shall be furnished complete with oil which does not contain more than 1 ppm PCB's and shall indicate that they are non-PCB by affixing a non-PCB label to the transformer directly above the kVA rating for the transformer. As a minimum, label shall be 2" wide x 3" long and blue in color.

9.1.6.2 All units shall be of sealed tank construction and remain effectively sealed for a top oil temperature range of -5 degrees C. to +105 degrees C.

9.1.6.3 The manufacturer shall certify that the liquid dielectric or any component of the liquid dielectric is not listed in the Federal Register, Vol. 45, No. 98, issued Monday, May 19,1980, 40FR, Part 461, Appendix VII Subpart 0 - Identification and Listing of Hazardous Waste and is in conformance with EPA 40 CFR Part 761.

9.1.7 Impedence

a. The percent impedence (%IZ) as measured on the rated voltage shall be as follows:

KVA rating maximum %IZ minimum %IZ 10 through 75 3.0 1.5

100 through 167 3.0 1.6 333 through 500 4.0 2.0

9.1.8 Weights

COT prefers that the weights of each transformer size shall be no more than the following:

kVA Max Weight 10 400 lbs 15 480 lbs 25 685 lbs

37.5 815 lbs 50 995 lbs 75 1040 lbs 100 1270 lbs 167 1520 lbs

COT will consider and evaluate transformer designs that meet all criteria of this specification and exceed the maximum weight preference. Ultimate determination of whether transformer designs that exceed the listed max weight preference will be accepted shall be at the discretion of COT.

9.1.9 Testing

9.1.9.1 Transformer testing shall be provided and confirm to ANSI/IEEE C57.12.00 and ANSI/IEEE

C57.12.90. Bidder shall provide a manufacturer certification of compliance with this requirement.

9.1.9.2 Dielectric testing shall be provided and confirm to 6.2 of ANSI/IEEE C57.12.20. Bidder shall provide a manufacturer certification of compliance with this requirement.

9.1.9.3 Transformer enclosure shall pass test duty as defined in 9 of ANSI/IEEE C57.12.20. Bidder shall provide a manufacturer test report demonstrating compliance with this requirement.

9.1.10 All units shall have interlaced secondary windings.

10.0.0 SINGLE PHASE PADMOUNT TRANSFORMERS

10.0.1 This section of the specification covers the electrical and mechanical requirements for single phase, sixty cycle, oil filled, self cooled, single phase padmounted, distribution transformers, in various kVA ratings (167 KVA and smaller), for use on the City of Tallahassee underground electrical distribution system.

10.1.0 APPLICABLE DOCUMENTS

All transformers shall conform to the latest issue of the following American National Standards Institute

(ANSI) / Institute of Electrical and Electronics Engineers (IEEE) documents:

ANSI/IEEE C57.12.00-2010, IEEE STANDARD FOR GENERAL REQUIREMENTS FOR LIQUID-

IMMERSED DISTRIBUTION, POWER, AND REGULATING TRANSFORMERS

ANSI C57.12.25-1990, REQUIREMENTS FOR PAD MOUNTED, COMPARTMENTAL TYPE, SELF

COOLED, SINGLE PHASE DISTRIBUTION TRANSFORMERS WITH SEPARABLE INSULATED HIGH

VOLTAGE CONNECTORS; HIGH VOLTAGE, 34,500 GRD.Y/19,920 VOLTS AND BELOW; LOW

VOLTAGE, 240/120 VOLTS; 167 KVA AND SMALLER.

ANSI/IEEE C57.12.28-2014, IEEE STANDARD FOR PADMOUNTED EQUIPMENT-ENCLOSURE

INTEGRITY

ANSI/IEEE 386-2006, IEEE STANDARD FOR SEPARABLE INSULATED CONNECTORS FOR POWER

DISTRIBUTION SYSTEMS ABOVE 600 VOLTS

ANSI/IEEE C57.12.90-2010, IEEE STANDARD TEST CODE FOR LIQUID-IMMERSED DISTRIBUTION

POWER, AND REGULATING TRANSFORMERS

10.2.0 RATINGS

10.2.1 All ratings shall be based on not exceeding a 65 degree C winding temperature rise. The high voltage basic impulse insulation level (BIL) shall be 95 kV.

10.2.2 All units are to be rated 12470 Grd Y/7200 V on the high voltage side.

10.2.3 All units are to be rated 240/120V Grd Y on the secondary voltage side. KVA ratings shall be 25, 37.5, 50, 75, 100, and 167 in the quantities specified on the quotation form.

10.3.0 DESIGN AND CONSTRUCTION

10.3.1.0 General

10.3.1.1 The pad-mounted compartmental-type transformers shall consist of the transformer tank and high and low voltage terminating compartments. The transformer tank and high and low voltage terminating compartments shall be assembled as an integral unit, tamper resistant and weatherproof for mounting on a pad.

10.3.1.2 The transformer shall conform to ANSI C57.12.25.

10.3.1.3 All units shall have interlaced secondary windings.

10.3.1.4 All units shall be subject to the following dimensional limitations:

The maximum exterior width shall be 37" (excluding any radiators).

The maximum exterior depth shall be 40” (excluding any radiators).

Radiators shall not extend the width or depth by more than 6”.

10.3.1.5 COT prefers that the weights of each transformer size shall be no more than the following:

kVA Lbs.

25 1500

37.5 1500 50 1500 75 1500 100 1500 167 1900 exceed the maximum weight preference.

10.3.2 Bushings and Terminals

10.3.2.1 The terminal arrangement shall be as specified in the ANSI C57.12.25 for Type 2 terminal arrangements with minimum dimensions as specified in Figure 2 for a rating of 8.3 kV.

10.3.2.2 The transformer shall be supplied with 8.3/14.4 kV class bushing wells and loadbreak bushing inserts which conform to the requirments of ANSI/IEEE Standard 386-. Bushing wells shall be externally clamped.

10.3.2.3 The transformers shall provide loop feed capability. The minimum current carrying capabilities of components for the loop primary cable system shall be 200 amperes (continuos) and 10,000 amperes symmetrical (momentary).

10.3.2.4 The low voltage terminals shall be in accordance with Figure 4(C) of ANSI C57.12.25 and shall be externally clamped. The low voltage terminal stud bolts shall be copper, the neutral bushing stud bolt shall be provided with two (2) nuts on the stud.

10.3.2.5 The low voltage neutral shall be a fully insulated bushing. A ground pad shall be provided on the outer surface of the tank. A removable ground strap, suitable sized for the rating of the transformer shall be provided and connected between the low voltage neutral bushing and the ground pad.

10.3.3 High and Low Voltage Compartment

10.3.3.1 The high and low voltage compartments shall comply with ANSI C57.12.25.

10.3.3.2 The high voltage portion of the compartment shall contain the high voltage bushing wells and be provided with a cable accessory parking stand.

10.3.4 Accessory Equipment

10.3.4.1 Accessory equipment shall be provided in accordance with ANSI C57.12.25.

10.3.4.2 Lifting provisions shall be of adequate strength and size to allow for the lifting of the complete transformer assembly when filled with oil and shall be arranged on the tank to provide a distributed balance lift in a vertical direction.

10.3.4.3 Terminal designations shall be as shown in Figure 2 of ANSI C57.12.25. The identification of the terminal connection shall be as shown on the instruction nameplate.

10.3.4.4 An instruction nameplate shall be provided in conformance to ANSI C57.12.25.

10.3.4.5 The transformers shall be provided with the following labels, designed for outside application, permanantly affixed to the front of each unit.

(a) KVA Rating Label - 1” Tall Yellow Stencil Lettering (Shall be centered above the Danger Hazardous Voltage decal).

and (Shall be centered above the Voltage Rating Label).

(b) Warning-Energized Electrical Equipment decal Uticom Systems Inc. product code: U7010WWN-ES-COT-FL (Shall be centered on the front of the transfomer).

(c) “Non-PCB’s” Label in conformance with EPA 40 CFR Part 761 (Shall be centered below the Danger Hazardous Voltage decal).

(d) Voltage Rating Label - 1” Tall Yellow Stencil Lettering (The Secondary Voltages shall be clearly and permanently marked on the front of the tank.

Markings shall be made with fade resistant material.)

10.3.4.6 The transformers shall come equipped with provisions for mounting Fault Indicators in accordance with the following drawing. Bolt holes shall be painted to the same standards as the rest of the transformer.

The bolts, washers and nut shall all be stainless steel. The first bolt hole shall be centered 4” from the top and 4” from the left on the front high voltage door of each unit. Mounting provisions for each high voltage terminal shall be provided with 6” horizontal spacing between each hole.

10.3.5 Dielectric Oil

10.3.5.1 Transformers shall be furnished complete with oil which does not contain more than 1 ppm PCBs.

The manufacturer shall indicate that the transformer is non-PCB by affixing a non-PCB label to the exterior of the transformer. At a minimum, the label shall be 2" wide by 3" long and blue in color .

10.3.5.2 All units shall be of a sealed tank construction and remain effectively sealed for a top oil temperature range of -5 degrees C to +105 degrees C.

MOUNTING

WALL

TAMPER PROOF 1/4” BOLT

FLAT WASHER

HELICAL SPRING WASHER

1/4” HEX NUT

.30” DIA.

HOLE

10.3.5.3 The manufacturer shall certify the liquid dielectric or any component of the liquid dielectric is not listed in the Federal Register, vol. 45, No. 98, issued Monday, May 19, 1980, 40FR part 761, Appendix VIII Subpart D - Identification and Listing of Hazardous Waste and is in conformance with EPA 40 CFR Part 761.

10.3.5.4 Manufacturer shall install a Non-PCB sticker below the nameplate.

10.3.6 TANK

10.3.6.1 The tank construction shall comply with ANSI C57.12.25.

10.3.6.2 The tank shall be of all-welded steel construction. There shall be no exposed screws, bolts, or other fastening devices which are externally removable. The top shall be pitched to facilitate water run-off.

10.3.6.3 An automatic pressure relief valve (Qualitrol 202 series or equivalent) designed to relieve excessive internal pressure shall be installed on each transformer.

10.3.6.4 Tank grounding provisions shall be as specified in ANSI C57.12.25 for a Type 2 arrangement.

10.3.6.5 The high voltage portion of the compartment shall contain a drain plug at the bottom of the tank.

10.3.7 Assembly

10.3.7.1 The assembled unit shall be tamper resistant and suitable for mounting on a concrete, fiberglass or plastic pad.

10.3.7.2 The transformer door shall be fastened to the case with stainless steel hinges and hinge pins. The hinge pins shall be held in place by a mechanical stop which will allow removal of the door only in the fully open position.

10.3.7.3 Provisions shall be made for padlocking the cover when closed. A captive penta head bolt shall be provided for securing the cover. Locking provisions shall be recessed, in accordance with ANSI/IEEE C57.12.28.

10.3.8 Finish

10.3.8.1 The enclosure coating system shall conform to the requirments of ANSI/IEEE C57.12.28

10.3.8.2 The tank coating shall be high grade paint applied with a powder coated finish process. The transformer shall be sealed and painted to withstand conditions of extreme humidity and high exposure to direct sunlight. The finish coat shall be Munsell-7GY-3.29/1.5 Padmount Green. Paint thickness shall be a minimum of 2.5 mils.

10.3.9 Overcurrent Protection

10.3.9.1 All units shall be provided with an oil immersed drawout expulsion BAY-O-NET Dual Element-type Fuse in series with an ELSP type Current limiting backup fuse designed to protect the transformer in the event of secondary or internal faults, or under overload conditions. The BAY-O-NET fuse shall be replaceable and hook stick operable. The following manufacturer's fuse sizes and types shall be installed in each size transformer:

Transformer Size

BAY-O-NET

Dual Element Fuse Cooper

Catalog #

ELSP Current Limiter Cooper

Catalog #

25 4038108C04 CBUC08030C100

37 4038108C06 CBUC08040C100

50 4038108C06 CBUC08050C100

75 4038108C07 CBUC08080C100

100 4038108C09 CBUC08100C100

167 4038108C11 CBUC08150D100

10.3.9.2 The fuse well shall have a protective drip-plate installed directly beneath the opening to prevent drippage onto the bushings and cable assemblies.

10.3.10 Impedance

10.3.10.1 The percent impedance (%IZ) as measured on the rated voltage shall be as follows:

kVA Rating Maximum %IZ Minimum %IZ 25 thru 75 3.00 1.50 100 thru 167 3.00 1.60

10.4.0 Testing

10.4.1 Transformer testing shall be provided and confirm to ANSI/IEEE C57.12.00 and ANSI/IEEE C57.12.90.

Bidder shall provide a manufacturer certification of compliance with this requirement.

10.4.2 Dielectric testing shall be provided and confirm to 5.2 of ANSI/IEEE C57.12.25. Bidder shall provide a manufacturer certification of compliance with this requirement.

11.0.0 THREE PHASE PADMOUNT TRANSFORMERS

11.0.1 This section of the specification covers the electrical and mechanical requirements for three phase ,sixty cycle, wye-wye connected, pad mounted ,distribution transformers in various KVA ratings for use on the City of Tallahassee underground electric distribution system

11.1.0 APPLICABLE DOCUMENTS

11.1.1 All transformers shall conform to the latest issue of the following American National Standards Institute (ANSI) / Institute of Electrical and Electronics Engineers (IEEE) documents:

ANSI/IEEE C57.12.00-2010, IEEE STANDARD FOR GENERAL REQUIREMENTS FOR LIQUID-

IMMERSED DISTRIBUTION, POWER, AND REGULATING TRANSFORMERS

ANSI/IEEE C57.12.28-2014 , IEEE STANDARD FOR PADMOUNTED EQUIPMENT-ENCLOSURE

INTEGRITY

ANSI/IEEE C57.12.34-2009, IEEE 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

ANSI/IEEE C57.12.90-2010, IEEE STANDARD TEST CODE FOR LIQUID-IMMERSED DISTRIBUTION

POWER, AND REGULATING TRANSFORMERS

ANSI/IEEE 386-2006, IEEE STANDARD FOR SEPARABLE INSULATED CONNECTORS FOR POWER

DISTRIBUTION SYSTEMS ABOVE 600 VOLTS

11.2.0 RATINGS

11.2.1 All ratings shall be based on not exceeding a 65 Degree C winding temperature rise. Basic Lightning

Impulse Insulation level (BIL) of all units shall be 95 KV.

11.2.2 All units are to be rated 12470 Grd.Y/ 7200 Volts on the high voltage side.

11.2.3 Low voltage and KVA rating of units shall be as specified in the bid document.

11.3.0 DESIGN AND CONSTRUCTION

11.3.1 GENERAL

11.3.1.1 All units shall be constructed in compliance with ANSI/IEEE C57.12.34.

11.3.1.2 All units shall be a pad mounted compartmental type, which when assembled shall be an integral unit for mounting on a pad.

11.3.1.3 All units shall be designed to comply with the short circuit capability requirements of ANSI/IEEE

C57.12.00.

11.3.1.4 All units shall be a loop feed design and comply with those specific dimensions specified in

Figures 8, 12 and 14A of ANSI/IEEE C57.12.34 except as noted in Attachments "B", "C", “D”, and “E” of this document.

11.3.1.5 All units shall accommodate the pad dimensions and window locations shown in Attachments "F", "G", and “H” of this document and maintain a minimum of 3” of separation between the edge of the transformer and the top of the pad chamfer.

11.3.2 BUSHINGS AND TERMINALS

11.3.2.1 The number, location, and arrangement of the high voltage bushings and low voltage bushings and terminals shall be as shown specified in Figures 8, 12 and 14A of ANSI/IEEE C57.12.34 except as noted in Attachments "B", "C", “D”, and “E” of this document.

11.3.2.2 All units shall be supplied with bushing wells on the high voltage side which conform to the interchangeability of ANSI/IEEE Standard 386. Bushing wells shall be externally clamped and shall be provided for a loop feed system with dimensions as shown specified in Figures 8, 12 and 14A of ANSI/IEEE C57.12.34 except as noted in the attached drawing.

11.3.2.3 High voltage bushings shall also be supplied with the units. Bushings shall be loadbreak and be one of the following approved catalog numbers: ELASTI-MOLD 1601-A4, CHARDON 9U02AAB001, or COOPER LBI215.

11.3.2.4 Low voltage bushings shall be provided in a staggered terminal arrangement. Low voltage line and neutral terminals shall be spade type as specified in Figures 15A of ANSI/IEEE C57.12.34.

11.3.2.5 Low voltage bushings on units rated 500 KVA and smaller shall be epoxy with terminals constructed with spades on threaded studs and shall be externally clamped. Low voltage bushings on units rated 750KVA and larger shall be either epoxy or porcelain with terminals constructed with spades on threaded studs and shall be externally clamped.

11.3.2.6 Low voltage bushings on units rated 750 KVA and larger shall be supported with an insulating material designed to counteract any downward forces resulting from the connection of multiple cables to the bushings with an approved method. The method shown in the figure below is approved. Alternate methods to the approved method shown below must provide support in such a manner that does not interfere with circuit termination to the spade bushings. (i.e. Methods that support by termination to the top of the spade must not be wider than the spade.) Any manufacturer not supplying these supports will have the transformer returned to them at their expense for reworking.

11.3.2.7 The low voltage neutral shall be a fully insulating bushing. A ground pad shall be provided on the outer surface of the tank with one or more removable ground straps suitably sized for the short circuit rating of the transformer provided and connected between the neutral bushing and the ground pad.

11.3.3 HIGH AND LOW VOLTAGE SEGMENT

11.3.3.1 The high and low voltage segment shall be as shown in Figure 12 of ANSI/IEEE C57.12.34 except as noted in Attachments "B", "C", “D”, and “E” of this document.

11.3.3.2 A rigid steel partition shall be provided separating the high and low voltage compartments as designated in Figure 12 of ANSI/IEEE C57.12.34.

11.3.3.3 Locking provisions shall be provided in accordance with Paragraph 8.3 of ANSI/IEEE C57.12.34 utilizing a captive penta-head bolt. Enclosure security shall conform with Paragraph 8.4 of

ANSI/IEEE C57.12.34.

11.3.3.4 Compartment doors shall be equipped with latching in the open position. Hinge assemblies and pins shall be stainless steel. The door of the high voltage compartment shall be held closed by a captive stainless steel or silicon bronze penta-head bolt which is accessible only after the low voltage door is opened. Hex head bolts are not permitted on either the low voltage or the high voltage compartment doors.

11.3.4 ACCESSORY EQUIPMENT

11.3.4.1 All units shall be provided with permanently attached lifting provisions arranged on the tank to provide a distributed balanced lift in a vertical direction for the completely assembled transformer and conform with Paragraph 8.6 of ANSI/IEEE C57.12.34.

11.3.4.2 A permanently marked diagrammatic instruction nameplate shall be located inside the low voltage compartment and be in accordance with all provisions contained in ANSI/IEEE C57.12.34., Paragraph 8.8.2. When FR3 is ordered; the nameplate shall state that transformer is to be used with Envirotemp FR3 Natural Ester Fluid only.

11.3.4.3 The transformer shall be furnished with the following options located in the low voltage compartment: an oil temperature gauge, an oil level gauge, and an automatic pressure relief valve (Qualitrol Series 202 or equivalent) designed to relieve excessive pressures as stated in ANSI/IEEE C57.12.34, Paragraph 8.9.2.

11.3.4.4 The transformer shall be furnished with an oil drain valve located in the primary compartment six inches off the right wall.

11.3.4.5 The transformers shall be provided with the following labels, designed for outside application, permanantly affixed to the front of each unit. All markings or labels shall be made with fade resistant material.

(a) KVA Rating Label - 6” Tall Yellow Stencil Lettering (Shall be centered 4-6 inches above the Secondary Voltage Label [Interior and Exterior]).

(b) Secondary Voltage Label - 6” Tall Yellow Stencil Lettering (Shall be centered 4-6 inches above the Danger Hazardous Voltage decal) and (Permanently marked on the front of the tank on the high voltage compartment door. )

(c) Warning-Energized Electrical Equipment decal (see attachment “A”) Uticom Systems Inc. product code: U7010WWN-ES-COT-FL (Shall be centered on the front of the transformer on the high voltage compartment door).

(d) Danger Hazardous Voltage decal (Shall be centered on the inside of the high voltage compartment door)

(d) “Non-PCB’s” Label in conformance with EPA 40 CFR Part 761 (Shall be centered 4-6 inched below the Warning-Energized Electrical Equipment decal).

11.3.4.6 The transformers shall come equipped with provisions for mounting Fault Indicators in accordance with the following drawing. They shall be painted to the same standards as the rest of the transformer.

The bolts, washers and nut shall all be stainless steel. The first bolt hole shall be centered 4” from the top and 4” from the left on the front high voltage door of each unit. Mounting provisions for each high voltage terminal shall be provided with 6” horizontal spacing between each hole.

MOUNTING WALL

TAMPER PROOF 1/4” BOLT

FLAT WASHER

HELICAL SPRING

WASHER

1/4” HEX

NUT

.30” DIA.

HOLE

11.3.5 Dielectric Oil

11.3.5.1 Transformers shall be furnished complete with oil which does not contain more than one (1) ppm

PCB. The manufacturer shall indicate that the transformer is non-PCB by affixing a non-PCB label to both the exterior of the transformer and the interior tank wall of the low voltage compartment. At a minimum, the interior label shall be 2" wide by 3" long and blue in color. The exterior label shall be affixed to the high voltage compartment door.

11.3.5.2 Transformers may be furnished complete with Envirotemp FR3 Natural Ester Fluid as an option

(See alternate pricing sheet). When FR3 Fluid is used; the nameplate shall state that transformer is to be used with Envirotemp FR3 Natural Ester Fluid only.

11.3.6. TANK

11.3.6.1 All units shall be of an all welded steel construction.

11.3.6.2 All units shall be provided with a domed cover to aid water run-off.

11.3.7 FINISH

11.3.7.1 The tank coating shall be high grade paint applied with a powder coated finish process. All units shall be coated with a primer and finish coat to provide a tough, non-chalking weather resistant finish. The finish coat shall be dark green Munsell-7.5G.Y.3.29.1.5 (Olive Green). The paint thickness shall be a minimum of 2.5 mils.

11.3.8 FUSING

11.3.8.1 All units shall be provided with an oil immersed drawout expulsion BAY-O-NET type Fuse in series with an ELSP type Current limiting backup fuse designed to protect the transformer in the event of secondary or internal faults, or under overload conditions. The BAY-O-NET fuse shall be replaceable and hook stick operable. The following manufacturer's fuse sizes and types shall be installed in each size transformer:

Transformer Size

BAY-O-NET

Fuse Cooper Catalog

Number

ELSP Current Limiter Cooper Catalog

Number

75 4038108C04 CBUC15030C100

112 4038108C06 CBUC15030C100

150 4038108C06 CBUC15030C100

225 4038108C07 CBUC15050C100

300 4038108C09 CBUC15080C100

500 4038108C11 CBUC15100C100

750 4038108C12 CBUC15100C100

1000 4038108C14 CBUC15125C100

1500 4038361C04CB CBUC15165D100

2000 4038361C05CB CBUC15250D100

2500 4038361C05CB *CBUC15150C100

* indicates two fuses in parallel

Only Cooper Power Systems fuses are approved at this time. Any manufacturer wishing to add their fuse as an equal to these fuses shall do so independently from this bid. Application for the approval of other manufacturer's fuses shall be made to the Electric Department, Power Engineering Division.

11.3.8.2 The fuse well shall have a protective drip-plate installed directly beneath the opening to prevent drippage onto the bushings and cable assemblies.

11.3.9 IMPEDANCE

11.3.9.1 The nominal percent impedance (%IZ) at the rated voltage shall be as follows:

KVA RATING MAXIMUM %IZ MINIMUM %IZ

75 THROUGH 500 5.00 2.7

750 THROUGH 2500 5.75 5.75

11.3.9.2 The tolerances for nominal percent impedance on transformers shall be as specified in 5.2 of

ANSI/IEEE C57.12.34.

11.3.10 TRANSFORMER WEIGHTS

11.3.10.1 COT prefers that the weights of each transformer size shall be no more than the following:

KVA Size Maximum Weight of Transformer (lbs)

75 4400

112.5 4600 225 5900 300 5900 500 7300 750 9200 1000 11000 1500 12600 2000 15000 2500 16000 exceed the maximum weight preference.

11.3.11 TESTING

11.3.11.1 Dielectric testing shall be provided and confirm to 7.2 and 7.3 of ANSI/IEEE C57.12.34. Bidder shall provide a manufacturer certification of compliance with this requirement.

11.3.11.2 Transformer testing shall be provided and confirm to ANSI/IEEE C57.12.00 and ANSI/IEEE

C57.12.90. Bidder shall provide a manufacturer certification of compliance with this requirement.

12.0.0 TECHNICAL EXHIBIT A

12.0.1 See the following Technical Exhibit A, Attachments A through G.

TECHNICAL EXHIBIT A – ATTACHMENT “A”

ELECTRIC UTILITY CONSTRUCTION STANDARDS

THREE PHASE PADMOUNT TRANSFORMER

BUSHING CONFIGURATION, 75 TO 150 KVA

REVISED - 4/30/15

POWER ENG. APPROVED - W. INFINGER

X

X

X

X

H

1A

H

2A

H

3A

H

3B

H

1B

H

2B

TECHNICAL EXHIBIT A

- ATTACHMENT 'B'

BUSHING CONFIGURATION, 225 TO 500 KVA

REVISED - 4/30/15

POWER ENG. APPROVED - W. INFINGER

X

X

X

X

H

1A

H

2A

H

3A

H

3B

H

1B

H

2B

- ATTACHMENT 'C'

BUSHING CONFIGURATION, 750 TO 1500 KVA

REVISED - 4/30/15

POWER ENG. APPROVED - W. INFINGER

X

X

X

X

H

1A

H

2A

H

3A

H

3B

H

1B

H

2B

- ATTACHMENT 'D'

ELECTRIC UTILITY CONSTRUCTION STANDARDS THREE PHASE PADMOUNT TRANSFORMER

BUSHING CONFIGURATION, 2000 TO 2500 KVA

REVISED - 4/30/15

POWER ENG. APPROVED - W. INFINGER

X 0

X 1

X 2

X 3 H

1A

H 2A

H 3A H 3B

H 1B

H 2B

- ATTACHMENT 'E'

THREE PHASE PADMOUNT TRANSFORMER

MOUNTING PAD, 75 TO 500 KVA

PAGE -

T & D APPROVED - G. Yount

REVISED - 5/20/15

POWER ENG. APPROVED - W. INFINGER

ELECTRIC UTILITY CONSTRUCTION STANDARDS ELECTRIC UTILITY CONSTRUCTION STANDARDS

THREE PHASE PADMOUNT TRANSFORMER

MOUNTING PAD, 750 TO 1500 KVA

PAGE -

T & D APPROVED - G. Yount

REVISED - 5/20/15

POWER ENG. APPROVED - W. INFINGER

THREE PHASE PADMOUNT TRANSFORMER

MOUNTING PAD, 2000 TO 2500 KVA

PAGE -

T & D APPROVED - G. Yount

REVISED - 5/20/15

POWER ENG. APPROVED - W. INFINGER

TECHNICAL EXHIBIT A

- ATTACHMENT 'H'

TECHNICAL EXHIBIT A

- ATTACHMENT 'G'

- ATTACHMENT 'F'

ELECTRIC UTILITY CONSTRUCTION STANDARDS ELECTRIC UTILITY CONSTRUCTION STANDARDS

THREE PHASE PADMOUNT TRANSFORMER

MOUNTING PAD, 750 TO 1500 KVA

PAGE -

T & D APPROVED - G. Yount

REVISED - 5/20/15

POWER ENG. APPROVED - W. INFINGER

THREE PHASE PADMOUNT TRANSFORMER

MOUNTING PAD, 2000 TO 2500 KVA

PAGE -

T & D APPROVED - G. Yount

REVISED - 5/20/15

POWER ENG. APPROVED - W. INFINGER

TECHNICAL EXHIBIT A

- ATTACHMENT 'H'

- ATTACHMENT 'G'

THREE PHASE PADMOUNT TRANSFORMER

MOUNTING PAD, 2000 TO 2500 KVA

PAGE -

T & D APPROVED - G. Yount

REVISED - 5/20/15

POWER ENG. APPROVED - W. INFINGER

- ATTACHMENT 'H'