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November 14, 2019

Invitation for Bid No. 20-17Action Person: Miranda Duke

Bid Opening: December 11, 2019, at 1:00 PM CDTPlace:112 Spragins Street Huntsville, Alabama 35801

Please provide a delivered price and availability on the following:

Quantity of 1: Power Transformer (161 kV-25 x12 kV, 25/33/41/46 MVA)

Your proposal should be submitted in duplicate on Pages 28 and 29 of the enclosed specification.

For purposes of this query we will consider only transformers which meet the requirements of theabove referenced specification and are manufactured by the specified manufacturer or a provenequivalent. If you propose an equivalent manufacturer, provide descriptive literature whichdemonstrates that our requirements are met. Huntsville Utilities is the sole judge of equivalency.Transformer must be of domestic USA in origin. Advise of manufacturer and model quoted.Advise of any price break quantities.

Quote terms, availability, firm price, and FOB Huntsville, Alabama. We reserve the right toconsider alternative pricing proposals.

Please mark your envelope with the bid opening information in the lower left corner and includethe bid number, opening date, and designated action person. If you use a window envelope, thisinformation should be visible.

Signed, dated, and sealed proposals will be accepted until 1:00 PM on the above bid opening date.

Proposals sent via US Mail should be sent to the following address (Note: US Mail does not deliverto our physical location):

Huntsville UtilitiesP.O. Box 2048Huntsville, AL 35804Attn: Miranda Duke, IFB 19-61

Proposals sent via Federal Express, UPS, or other courier may be sent to our location at thefollowing address:

Huntsville Utilities112 Spragins StreetHuntsville, AL 35801Attn: Miranda Duke, IFB 19-61

Your assistance is appreciated.Miranda [email protected]

HUNTSVILLE UTILITIES ELECTRIC DEPARTMENT

CONSTRUCTION STANDARDS AND SPECIFICATIONSREVISED 10/24/16 KH APPROVED 10/24/16EED105.38\3 Page 1 of 29

POWER TRANSFORMER 16125X12 kV 25/33/41/46MVA

October 24, 2016


POWER TRANSFORMER GENERAL SPECIFICATIONFOR

DUAL VOLTAGE, 161 kV – 25 x 12 kV, 25/33/41/46 MVATRANSFORMER

1. SCOPE

1.1 These specifications cover a complete outdoor three phase, two winding powertransformer. The transformer with its accessories and requirements is described in thefollowing paragraphs. This is not an autotransformer.

1.2 This power transformer will be used in an outdoor substation and will be fed from animpedance grounded Wye overhead 161 kV circuit. The outgoing low side of the powertransformer will be connected into a 4-wire, 3-phase, 24.94/14.4 or 12.47/7.2 kV,grounded Wye, overhead and underground utility electrical system.

1.3 The oil-filled transformer(s) shall be designed, manufactured and tested in accordancewith this specification and all applicable sections of latest revisions of the following,unless otherwise specified.

1.4 All applicable provisions of ANSI C57 and NEMA TR-1 on Transformers, Regulators,and Reactors.

1.5 ANSI C76.1 on Apparatus Bushings.

1.6 ANSI C62.1 and NEMA LA1 for Surge Arrester.

1.7 ANSI C80.1 Standard Specifications for Rigid Steel Conduit.

1.8 ANSI B16.5 for Slip-on Welding Flanges.

1.9 Latest IEEE Short Circuit Withstand Requirements.

1.10 ICEA Specifications for Wire and Cable.

1.11 National Electric Code.

1.12 American Welding Society (AWS) Standards for all welding.

1.13 All standards are to be the latest revisions. If more than one standard or code applies, themost/more rigid shall apply.




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2. DRAWINGS AND INSTRUCTIONS

2.1 Three (3) copies of approval drawings, including the following, but not limited to, shallbe submitted to Huntsville Utilities within 120 days of issuance of a purchase order for atransformer covered by this specification.

2.1.1 Plan, elevation, general arrangement, and base details. Outline drawings shall locatethe center of gravity.

2.1.2 Terminal board physical arrangement in the control cabinets.

2.1.3 Detail drawings, connection, alarm, control, and auxiliary schematic and wiringdiagrams of accessory equipment.

2.1.4 Conduit and terminal details for all control and auxiliary equipment.

2.1.5 Nameplate data.

2.1.6 Bushing current transformer data.

2.1.7 Other drawings, diagrams, and instructions required for installation, operation, andmaintenance of the equipment.

2.1.8 Huntsville Utilities will, within 30 days after receipt of prints or drawings forapproval, forward one(1) copy to the Supplier marked “Approved,” “Approved withCorrection as Noted”, or “Returned for Correction.” Time involved in drawingapproval will be considered as having been included in delivery time.

2.1.9 Prints marked “Approved” authorize the Supplier to proceed with the fabrication ofthe equipment covered by such drawings.

2.2 The successful bidder shall furnish three (3) copies of the necessary operatinginstructions. These instructions must be received by Huntsville Utilities Electric Systemtwo (2) weeks prior to the transformer delivery date.

2.3 Reproducible drawings of the following shall be provided.

2.3.1 Plan, elevation, nameplate, general arrangement, and base details showing weights,dimensions, and gallons of oil. Outline drawings shall locate the center of gravity.

2.3.2 Terminal board physical arrangement in the control cabinets.

2.3.3 Detail drawings, connection, alarm, control and auxiliary schematic and wiringdiagrams of accessory equipment.




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2.3.4 Conduit and terminal details for all control and auxiliary equipment.

2.3.5 Nameplate data.

2.3.6 Bushing current transformer data.

2.3.7 Other drawings, diagrams, and instructions required for operation, installation, andmaintenance of the equipment.

2.4 All weights and dimensions shall be given in USA units of weights and measures, inaddition to any other units used.

2.5 Extension of time for the submittal of drawings may be allowed, but in no event shallextension be granted which will affect the shipping schedule of the transformer.

2.6 One set of AutoCAD 2009LT(tm) files on CD/DVD shall be supplied. These files shallbe for those items in Section 2.3.

2.7 Liquidated damages of one hundred dollar ($100.00) per day shall be assessed if theapproval drawings are delayed beyond 120 days. The purchaser reserves the right tocancel any purchase order placed on this specification, if the approval drawings are notdelivered within 120 days.

3. CONSTRUCTION

3.1 The transformer core, coils, and tank shall be built and assembled as a unit in the UnitedStates of America.

3.2 The transformers shall be designed, built and tested according to the latest NEMA andANSI standards and other requirements stated herein.

4. PHYSICAL CONDITIONS

4.1 The transformer shall be furnished for operation in the following physical conditions:

4.2 Altitude: 0 to 3000 feet above mean sea level.

4.3 Ambient temperature: -40 degrees F to +110 degrees F.

4.4 Wind load: 25 psf.

4.5 Seismic zone: 1 as defined by Standard Building Code.

5. GENERAL REQUIREMENTS

5.1 The transformer to be furnished shall meet the following specifications:




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5.1.1 Frequency: 60 Cycles AC

5.1.2 Connections: Highside: DeltaLowside: Wye

5.1.3 Winding Voltages: Highside (H): 161,700 voltsLowside (X): 24,940Y/14,400x12,470Y/7,200volt

5.1.4 Taps: Highside: 169,400; 165,500; 161,700; 157,850; 154,000 volts.(2 approx. 2 ½ percent full capacity taps above and2 approx. 2 ½ percent full capacity taps below ratedhigh voltage).

Lowside: No load tap changer with external selector switchfor selecting between 25 kV or 12 kV operation.

5.1.4.1 High voltage tap changer to be no load type for operation only when the transformeris de-energized. See Section 13 for details.

5.1.4.2 Low voltage connections are to be on a link board, located such that core and coil donot have to be exposed to change the lowside voltage.

5.1.5 Basic Impulse Levels:

5.1.5.1 Highside (H): 750 kV BIL5.1.5.2 Lowside (X): 150 kV BIL

5.1.6 Capacity:

5.1.6.1 161 kV (H) and 25 kV (X) windings

5.1.6.1.1 25,000 kVA Continuous 55° C Rise OA5.1.6.1.2 33,333 kVA Continuous 55° C Rise FA5.1.6.1.3 41,667 kVA Continuous 55° C Rise FA5.1.6.1.4 46,667 kVA Continuous 65° C Rise FA

5.1.6.2 The transformer is to be capable of operating at 112% of the above ratings withoutexceeding 65° C rise.

5.1.6.3 All auxiliary cooling equipment shall be included to give the above ratings.

5.1.6.4 The capacity of all current carrying parts shall be based on the highest 65 degrees C fancooled rating except as noted under Section 10, Bushings.




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5.1.6.5 Designs using OA/FA/FOA or OA/FOA/FOA types of cooling to obtain 25/33/41 MVAwill also be evaluated, if offered.

5.1.7 The temperature rise, maximum degrees C shall be:

1. By Resistance:65 degrees C.2. By Hot Spot: 80 degrees C.

5.1.8 Duty: Continuous

5.1.9 Angular Phase Displacement:

5.1.9.1 The Low Side Voltages Lagging the Respective High Side Voltages by 30 degrees.

5.2 Excitation: Design for operations within standard excitation limits. ANSI standards105% full load; 110% no load.

5.3 Impedance:

5.3.1 The 161 – 25 kV impedance shall be the standard impedance for OA rated with 750 kVBIL high winding and 150 kV BIL low winding.

5.4 Noise: Design shall meet the requirements of NEMA TR-1, latest revision, for audiblenoise levels.

5.5 All coils to be of copper construction.

6. TESTS

6.1 The following factory tests shall be performed.

6.2 This transformer is to be built and tested in accordance with latest revision of theapplicable industry standards prepared by the National Electrical Manufacturer’sAssociation (NEMA), the USA Standards Associations, and ANSI 57.12.00.

6.3 The transformer covered by this specification will meet the short circuit qualificationrequirements given in the latest edition of the short circuit test code prepared by IEEEtransformer committee as an amplification.

All testing to be done on equipment traceable to the National Bureau of Standards (NBS)Document No. 1204.

6.4 Meggar test of coils, and core under oil, report shall indicate temperature of oil at whichthis test was made.




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6.5 All test reports to be certified by a professional engineer responsible for the tests and thetest reports.

7. MATERIALS AND WORKMANSHIP

7.1 The equipment shall be new and of standard, commercial, first grade quality as tomaterials, workmanship, and design, in accordance with the best engineering practice.

7.2 In minor details departures will be permitted from previous designs, provided suchdepartures are definite improvements over earlier installations.

8. GENERAL DESIGN

8.1 Transformer shall be capable of meeting all requirements specified herein and therequirements of ANSI C57.12.10 and NEMA TR-1, where applicable.

8.2 The transformer shall be capable of carrying without loss of life the overloads allowed inaccordance with ANSI C57.92.

8.3 The transformer shall be capable of being operated overexcited in accordance with ANSIC57.12.00. It is not to be operated beyond these limits.

8.4 Audible sound level shall meet the requirements of NEMA TR-1.

8.5 Internal corona, measured using the RIV method in accordance with NEMA Publication107, and measured at a frequency of 1000 kHz, shall not exceed 500 microvolts whenmeasured during the induced test at 125% of nominal line to ground voltage for wyeconnected transformers and 125% of 0.577 times the nominal winding voltage of deltaconnected transformers.

8.6 Main and neutral leads shall be brought out through outdoor type bushings which shall beso located that full flashover strength will be utilized.

8.7 Transformer coils shall be of the circular or round coil design.

9. CORE AND COIL

9.1 The core and coil shall be furnished as follows:

9.2 All transformer windings are to be copper.

9.3 Transformer core and coil to be conventional design. Rectangular core and/or sheetwindings are not acceptable.




October 24, 2016

9.4 Designs using only “leg irons” or “lock irons” for clamping are not acceptable.

9.5 Clamping ring(s) are to be one piece construction, made of non-metallic material.

9.6 Lifting facilities are to be provided for lifting the core and coil assembly from the tankusing four lifting cables.

10. BUSHINGS

10.1 The transformer bushings shall be furnished as follows:

10.2 All bushings are to be manufactured to the latest ANSI Standards and are to be sky grayANSI 70 glaze.

Highside: 3-cover mountedLowside: 4-cover mounted

Standard type bushings of the proper current rating for continuous line current atmaximum kVA and the proper voltage rating for the winding BIL with standard creepagedistances shall be furnished except that all four lowside bushings shall be 3,000 amperesize.

10.2.1 The line ends of the 161 kV winding shall be insulated for and brought out through a 161kV bushing having a BIL of 750 kV.

10.2.2 All of the 25 kV windings shall be insulated for 25 kV, 150 kV BIL and brought outthrough 25 kV bushings.

10.2.3 The lowside neutral shall be insulated and brought out and terminated on a covermounting bushing 25 kV bushings having a BIL of 150 kV.

10.2.4 The ampere rating of each bushing shall exceed the top FA or FOA current rating of thatwinding.

10.3 All bushings shall be wet-process, homogeneous, nonporous porcelain and free fromcavities or other flaws. The glazing shall be uniform in color and free from blisters,burns, and other defects.

10.4 Liquid-filled bushings shall be equipped with liquid-level indicators and means forsampling and draining the liquid.

10.5 All bushings shall have puncture strength greater than the dry flashover value.

10.6 Bushings shall be mounted at an angle with the vertical not to exceed 30 degrees.

10.7 All 161 kV bushings shall have taps brought out for use with potential devices.




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10.8 All 161 kV bushings shall have provision for power-factor testing without disconnectingmain leads.

10.9 Preferred Bushings

10.9.1 161 kV Bushing: ABB Power T&D Company #161W0800AA or Lapp #B67420-70,800 Amp, 161 kV, Draw Lead

10.9.2 25 kV Bushing: LAPP #B88833-70 or ABB Equivalent, 3000 Amp, 34.5 kV,Bottom Connect

10.10 All bushings shall be supplied by the same manufacturer.

10.11 Bushing Connectors

10.11.1 Each 161 kV phase bushing shall have an Anderson Electric Company type DS,Versa-Groove stud connector sized for the bushing stud and one (1) 500 MCMcopper cables.

10.11.2 Each 25 kV phase bushing, and neutral bushings shall have an Anderson ElectricCompany type D2S, Versa-Groove stud connector sized for the bushing stud and two(2) 500 MCM copper cables.

11. CURRENT TRANSFORMERS

11.1 Current transformers shall be furnished as follows:

11.2 Bushing mounted current transformers supplied shall meet ANSI C57.13 latest revisions.

11.3 Each 161 kV bushing (H1 , H 2, H 3) shall be supplied with:

11.3.1 Two (2) 600:5 ampere, multi-ratio, C400, relaying CT11.3.2 one (1) 600:5 ampere, single ratio, 0.3B-0.9 metering CT

11.4 Each 25 kV line bushing (X1, X 2, X 3) shall be supplied with three (3) CT’s:

11.4.1 Two (2) 3000:5 Ampere, 5 lead, multi-ratio, C400 relaying CT’s

11.4.2 One (1) 3000:5 Ampere, 5 lead, multi-ration 0.3 B 2.0 metering CT

11.4.3 The Xo winding neutral shall be supplied with one (1) 600:5 ampere, multi-ratio,bushing type, C400 relay class current transformer.

11.5 One suitable current transformer shall be supplied in one phase of each H and X voltagewinding to provide hot spot temperature of each winding. The hot spot temperature




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equipment will consist of continuously indicating dial thermometers mounted on theoutside tank wall at a height convenient to the design.

This indicator shall be equipped with resettable alarm contacts.

11.6 Current transformers (except hot spot) shall be NEMA standard ring type, multi-ratio,with all leads brought out to short circuiting terminal blocks located in a weatherproofcabinet suitable to the design.

Unless otherwise specified, all current transformers shall be of the multi-ratio type havingratios in accordance with NEMA SG-4 and accuracies in accordance with ANSI C57.13.

11.7 Unless otherwise specified, each bushing shall have space provided for not less than onebushing current transformer per bushing in addition to any space requirements for currenttransformers associated with winding temperature indicators.

11.8 Bushing current transformer nameplates listing the turn ratio connections shall bemounted adjacent to the current transformer short circuiting terminal boards.

11.9 Current transformer secondary leads from the secondary winding ends to the tank wallterminal box shall be stranded copper conductors no smaller than No. 12 AWG, and shallbe sealed to prevent escape of insulating oil.

11.10 Current transformers leads shall be long enough to reach out of the tank without splicingthe leads.

11.11 All multi-ratio current transformers shall have all five leads terminated on 6-pole short-circuiting terminal blocks, General Electric type EB-5 or equal. The terminal blocksshall be located in a weatherproof enclosure. The enclosure may be a separate box whichcan be safely reached without de-energizing the transformer; however, a locationaccessible from ground level is preferred.

11.12 Data supplied for each current transformer.

11.12.1 Ratio correction factor curves for each ratio for the ANSI Standard B2 burden (50 VAat .5 P.F.) over a range of .25 rated to 22 times rated primary current.

11.12.2 ANSI excitation curve for each ratio.

11.12.3 Resistance of transformer secondary and connecting leads for each ratio.

11.12.4 Actual current ratio and turn ratio for each tap.

11.12.5 Mechanical and thermal short-term (1 second) ratings.




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12. OIL PRESERVATION AND HANDLING

12.1 The standard sealed tank oil preservation system shall be used.

12.2 An inert gas pressure system shall be provided, having a gas cylinder filled with high-pressure gas, an automatic reducing valve, a breathing regulator, and a mechanical reliefvalve. The cylinder shall be located low enough on the tank so that maintenance can beperformed on the regulating equipment without the use of a ladder. A sufficient quantityof gas for purging the transformer shall be supplied in addition to the quantity of gasrequired for initial operation. The system furnished shall be automatic in operation, shallprovide for expansion and contraction of oil through a daily oil temperature range of 20°C without discharging gas, and shall seal the interior from atmosphere within the limitsprescribed in this specification. The oil level in the transformer and in the auxiliaryexpansion tanks, if required, shall be located below the level of the bushing flanges. Thissystem shall be installed inside a metal cabinet attached to the outside of the transformer.

12.3 When a conservator or expansion tank is furnished, the conservator or expansion tankshall have two one-inch filter valves, one at the bottom at one end, the other at the top,opposite end, in addition to the valves for the main tank. Filter valves may be omitted ifthe oil is sealed from the atmosphere. The conservator or expansion tank shall also havea shutoff valve and a sump with a small valve and sampling cock. An oil-level gaugeshall be mounted on the conservator or expansion tank. The conservator tank shall bemounted on the transformer.

12.4 Other methods of oil preservation may be proposed as alternates.

12.5 The transformer shall be equipped with the following valves with standard threadconnections for external piping:

12.5.1 One two-inch drain and filter valve located on the low voltage side. The drain valve shallbe located so as to drain the tank completely and shall be provided with a pipe plug. Inaddition, the valve shall be equipped with an approved integral sampling device not lessthan ¼ inch in size and mounted on the valve body on the discharge side. The samplingvalve shall be equipped with a protective cap or plug.

12.5.2 One 1-1/2 inch filter valve located below the oil level at the top of the bank on the highvoltage side. The opening of this valve shall be baffled to prevent aeration of the oil andshall be provided with a pipe plug.

12.5.3 All valves shall be capable of holding hot oil without leaking and of passing an air-pressure test of 75 pounds per square inch or an oil-pressure test of 50 pounds per squareinch. All threaded valves shall be furnished with pipe plugs for protection.

12.6 One or more relief devices as required by the design shall be furnished to operate at apressure below the test pressure for the tanks and the radiators; shall be equipped with a




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semaphore or other mechanical device readily visible from the ground to indicateoperation. The relief device shall be located at or above maximum oil level.

12.7 Insulation Oil

12.7.1 A sufficient quantity of oil shall be furnished with the transformer for filling each tank,radiator, and bushing to the proper level.

12.7.2 The oil is to be inhibited with a minimum of 0.3% DBPC and shall have othercharacteristics of Westinghouse WEMCO “C” or equal.

12.7.3 Oil shall be shipped from a USA refinery.

12.7.4 Oil shall be NON-PCB. PCB test report shall be supplied.

12.7.5 If the transformer is shipped dry, the transformer oil shall be delivered within two (2)weeks of the delivery of the transformer. See Item 24.9, Oil Shipment.

12.7.6 Proposal shall specify oil brand name and manufacturer.

13. MECHANICAL CONFIGURATION

13.1 Lifting

13.1.1 Lugs and bosses shall be provided on the outside for moving the transformer either by acrane or by jacks.

13.1.2 The tank shall be equipped with jacking facilities at each corner of the base.

13.1.3 The transformer base shall be so designed that the transformer can be rolled or skidded inany direction.

13.1.4 Lifting lugs shall be provided at each corner of the cover that will be capable of liftingthe complete transformer.

13.2 Manholes

13.2.1 Manholes with bolted covers shall be provided in the top or sides of the transformer toafford easy access to the lower ends of the bushings, the terminals, tap changers, and theupper portions of the coils and to permit replacement of current transformers or any otherauxiliaries without removing the tank cover.

13.2.2 No manhole shall be located in such position as to require removal of radiators, or otherparts or accessories to secure access.




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13.2.3 Manholes and handholes shall be not less than the minimum size specified in ANSIC57.10.

13.2.4 At least one (1) 15-inch manhole is required.

13.3 Any special cover, or lifting hardware designed for a particular transformer and which isrequired for shipping, shall become and remain the property of Huntsville Utilities.

13.4 All cover seats, flange joints, threaded connections, and pipe fittings shall be properlydesigned and manufactured so as to be and to remain oil tight. All gasketed joints belowthe oil level shall have steel stops to prevent over compression of gaskets. If thecompressed volume of the gasket shall be equal to or less than the volume of the recess.Spare gaskets shall be provided for all openings as shipping gaskets will not be reused.

13.5 Two (2) Copper faced, ground pads shall be supplied for permanently grounding the tankin two locations. They shall be welded on the tank wall near the base on diametricallyopposite corners.

13.6 Anderson Electric Co. GC-143A-02 ground clamps for two (2) #4-250 MCM AWGCopper cables from the top of the transformer to the transformer base shall be suppliedon both the high voltage and low voltage side of the transformer. These clamps are to bemounted on a maximum of four foot (4’) centers. These clamps shall ship with thetransformer.

13.7 Removable Core Ground accessible from manhole on the transformer cover. Groundshould be installed such that the oil does not have to be lowered to test the core ground.

13.8 Lifting facilities are to be provided for lifting the core and coil assembly from the tankusing four lifting cables.

13.9 TANK

The transformer tank shall have the following characteristics:

13.9.1 Construction:

The tank shall be of standard type construction with the proper radiators for operation atthe above fan-cooled rating.

13.9.2 Accessories:

The transformer tank shall be equipped with the following standard accessories.

13.9.2.1 Pressure: Vacuum gauge with a scale range between 10-pounds per square inchpositive pressure and 10-pounds per square inch negative pressure.




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13.9.2.2 Cover-mounted mechanical, self-resetting and reclosing pressure relief devicewith an operating signal visible from the ground.

13.9.2.3 Pressure vacuum bleeder that shall maintain the internal pressure within theproper predetermined limits, equipped with a sampling valve and factory calibrated.

13.10 DIMENSIONS

The completed unit should not exceed the following dimensions when installed. Thesedimensions are due to existing space constraints. If dimensions are exceeded, the Buildershall notify Huntsville Utilities and discuss the issue(s).

High Side to Low Side: 22’ 0” Length: 26’0” Height: 20’0”

The complete transformer shall not exceed 26 feet in width; it shall not exceed 22 feetfront to rear (HV to LV), because of existing space constraints.

13.11 Any additional devices required for the safe and proper operation of the transformer.

13.12 Ground clamps for two (2) #4-250 MCM copper cables (Anderson Electric #GC-143A-02 or approved equivalent) shall be provided on all the corners of the transformer. Theseshall be spaced 3-feet apart beginning at 3 feet from the bottom of the unit.

14. NO-LOAD TAP CHANGER

14.1 The transformer shall be equipped with manual, no-load tap changers connected to thevoltage taps as specified.

14.2 A handwheel or a lever with a position indicator shall be provided for operating the tapchanger. The handwheel for operating the high-voltage tap changer shall be located shallbe located on the high-voltage side. Facilities for locking in any tap position shall beprovided to accommodate a padlock requiring a one-half inch hole. The padlock will befurnished by Huntsville Utilities.

14.3 The mechanism shall be such that it will be impossible to leave a winding open or short-circuited when the operating handle is placed in a locked position. The locking devicemust positively prevent movement of the tap changer contacts when in the lockedposition using a standard lock.

14.4 The handwheel or lever for operating the tap changer shall be operable from transformerbase level. This handwheel or lever shall be at least three (3’) feet above the transformerbase.




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14.5 All drums, gears, handwheels, radial arms, shafts and/or other parts required to operate asa unit shall be positively fastened with keys or tapered pins to prevent improper operationcaused by relative motion between the parts required to operate as a single unit.

15. COOLING FACILITIES

15.1 Radiators shall be designed to withstand the vacuum and pressure conditions specified forthe tank.

15.2 Radiators shall be so designed as to be accessible for cleaning and painting, to preventaccumulation of water on the outer surfaces, to completely drain oil into the tank, and toensure against formation of gas pockets when the tank is being filled. Unless theradiators are removable and equipped with shutoff valves, they shall be separated by atleast six inches at the closest point.

15.3 All radiators or cooling tubes shall be attached to and mounted on the transformer tank.The arrangements of radiators shall be such that accessories may be mounted as specifiedherein.

15.4 If radiators are removable, they shall be connected to the tank by machined steel flangeswelded to the radiator and to the tank and provided with gaskets. At each radiatorconnection, there shall be provided on the tank an indicating shutoff valve which can befastened in either open or closed position. When the shutoff valves are fastened in theclosed position, oil leakage through the valves shall be negligible under all conditions. Aseparate oil tight blank flange shall be provided for each tank connection for use whenthe radiator is detached. Each radiator shall have a lifting eye(s), an oil drain at thebottom and a vent at the top. If radiators are assembled in groups, an upper and lowershutoff valve may be furnished for each group in lieu of furnishing shutoff valves foreach radiator. The group must be limited in size whereby the top rating of thetransformer will not be reduced more than 15% in capacity if the group is removed fromservice.

15.5 If forced cooling equipment is provided, it shall include a thermostatic switch operated byhot-spot temperature, a magnetic contactor with auxiliary alarm contacts, and any othernecessary auxiliaries, all mounted in a suitable weatherproof metal housing on thetransformer. Instruments and wiring in weatherproof housing shall be completedaccessibly.

15.6 Heat exchanger type cooling equipment will not be acceptable.

15.7 The cooling devices may consist of fans or oil pumps and fans. The failure of any onefan provided for the first rating shall not reduce that continuous rating by more than 5%.The failure of any one fan provided for the second rating shall not reduce that continuousrating by more than 4%. The failure of any one oil pump provided for the first ratingshall not reduce the continuous rating by any amount. The failure of any one pumpprovided for the second rating shall not reduce that continuous rating by more than 15%.




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A design using only one pump for either stage of forced cooling, whether in conjunctionwith fans or not, will not be acceptable. Any oil pump shall not impede the natural flowof oil when the pump is not running.

15.8 Motors for fans and pumps shall be for single-phase, 240 volt operation, and shall operatesuccessfully at rated load with a voltage variation of plus or minus 10 percent of 240volts.

15.9 Forced Air Devices (fans)

15.9.1 The transformer shall be equipped with sufficient fans to provide for the fan-cooledratings specified.

15.9.2 The fans shall be individually protected.

15.9.3 The fans should be self-contained and arranged so it will not be necessary to shut downall of the fans when removing any one radiator for repair.

15.10 The motor control shall be arranged for manual-off-automatic operation and shall beoperable from the transformer base level.

15.11 Oil pumps shall have shutoff valves on the inlet and outlet sides to permit replacementwithout draining oil from the transformer or radiators.

16. AUTOMATIC CONTROL FOR COOLING EQUIPMENT

16.1 The automatic controls shall have the following features:

16.2 The manufacturer shall set the controls to operate at the temperature he recommends asbeing proper for the transformer design. He shall state on the test report the actualtemperature settings which have been applied.

The automatic control shall be by means of a thermostatic switch operated by hot spottemperature.

16.3 The automatic controls for the coolers shall be capable of adjustment for operation at anyspecific temperature in the range of 50° to 90° C.

16.4 The winding temperature alarm shall be set to operate at 105° C but shall be capable ofadjustment for operation at any specific temperature in the range of 90° to 120° C.

16.5 The cooler controls and the winding temperature alarm shall be calibrated in order tomeasure accurately the temperature under conditions of forced cooling.

16.6 The manufacturer shall furnish as part of the final test report, all pertinent informationnecessary to check or calibrate accurately these controls and devices for self-cooled or




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forced cooled conditions including such things as current transformer ratios, heater-coilcircuit resistances, and appropriate calibration curves.

16.7 Individual automatic control equipment shall be provided for each stage of supplementalcooling. These may be actuated from the same winding temperature device, but all otherportions of the system (except for the external source of power) shall be electricallyseparate so that a failure on one system will not affect the other.

16.8 The automatic control equipment and motors shall be designed for normal operation at240 volts, single-phase, 60 hertz. The power supply will be provided by HuntsvilleUtilities from a separate source.

16.9 The controls shall include a transfer switch so that either stage of cooling may be selectedto come on first.

16.10 The automatic and manual controls shall be designed where an externally operatedcontact(s) of the SEL-2505 (6 amperes per relay) will de-energize the cooling equipment.

17. ACCESSORIES

17.1 All alarm contacts and control contacts shall be suitable for use on 48, 125, and 250 voltsDC.

17.2 Each transformer shall be equipped with the following accessories which shall be locatedas indicated below:

17.2.1 Magnetic-type oil-level gauge with alarm contacts. The gauge shall be readable from thetransformer base level.

17.2.2 Low-gas-pressure electric alarm device, when the transformer is equipped with inert gaspressure equipment.

17.2.3 Oil temperature indicator located a maximum of 66 inches above the transformer base onthe high voltage side. It shall be a floating pointer and alarm contacts to show maximumtemperature indication since last setting and shall be capable of being reset without theuse of tools. Resetting by means of a permanent magnet permanently attached to theindicator by a chain or otherwise will be acceptable.

17.2.4 One thermometer drywell for the customer’s use, located at the same level and adjacentto the thermometer specified in section 16.2.3.

17.2.5 Three (3) dial-type winding temperature indicators with adjustable alarm contacts shallbe furnished. It shall be located a maximum of 66 inches above the transformer base onthe high voltage side. It shall have a floating pointer since last setting and shall becapable of being reset without the use of tools. Resetting by means of a permanent




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magnet permanently attached to the indicator by a chain or otherwise will be acceptable.The indicator shall include necessary current transformers and heaters to indicate hottestspot of windings under all loading conditions specified.

17.3 The transformer and accessories shall be so designed that as far as practicable no specialtools for installation and servicing will be required. When special tools are necessary, thesupplier shall furnish one complete set per type of equipment per installation.

17.4 The dry wells for the oil temperature sensing devices specified shall be placed at the sidesof transformers at a location which will permit removal of the indicators withoutremoving the equipment from service.

17.5 All devices for initiating an electric alarm shall be supplied with ungrounded, circuit-closing, 250 volt DC contacts. Precautions shall be taken to protect these devices fromweather and against moisture condensation by provision of suitable electric heatingdevices.

17.6 Electrical accessories shall be wired in threaded rigid steel conduit or raceway, to thebottom of the transformer where they can be connected conveniently to external circuits.Exposed weatherproof flexible cable instead of rigid conduit and wire will be permitted ifit facilitates maintenance and operation, and then only in lengths not exceeding eight feet.

17.6.1 The wiring shall be terminated on terminal blocks equipped with designation strips andmounted in a single box located on the low-voltage side.

17.6.2 This terminal box shall have a removal undrilled plate bolted to the bottom for fielddrilling for conduit.

17.6.3 The control cabinet will be located on the high voltage or low voltage side.

17.6.4 All control, instrument, and auxiliary wiring furnished with the equipment shall bestranded copper wire of at least No. 12 AWG having an approved insulation rating of 600volts and temperature ratings of at least 75°C, based on NEMA or IPCEA Standards.

17.6.5 All control fuses shall be Class H, one-time, in accordance with NEMA FU-1. All circuitbreakers and contactors used in the cooling circuits shall be approved American madehaving a 600-volt rating.

17.7 The use of PVC type conduit shall not be accepted.

17.8 A sudden pressure relay will be mounted in the gas space above the oil for detection ofinternal faults. The manually reset relay circuit will be suitable for operation at 125 voltsDC. The sudden pressure relay is to be installed and connected so that it can be removedfor testing while the transformer is in service.

17.8.1 Sudden Pressure Relay, with alarm and trip contacts, in the control cabinet.




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17.9 In the control cabinet circuit breakers are to be used. No fuses.

17.10 The unit shall be equipped with a Morgan Schaffer Calisto unit.

17.11 The unit shall be equipped with an SEL-2505 (Part #2505464XX at the time of this spec)for use at 125 vdc with ST multimode connectivity. The following status points will beconnected to the SEL-2505: hot oil alarm, hotspot alarm, low oil alarm, sudden pressurealarm, H2O alarm, and H2 alarm.

18. CLEANING AND PAINTING

18.1 All interiors and exteriors of tanks, housings, cabinets,, and other metal parts shall bethoroughly cleaned of scale, corrosion, and foreign substances.

18.2 The transformer tank interior surfaces shall be painted with a white epoxy base primercompatible with transformer insulating oil; similar to Hentzen Chemical Company,number 3322WEP.

18.3 Exterior surfaces shall be cleaned by commercial blast cleaning or by pickling inaccordance with Steel Structure Painting Council Specification.

18.3.1 The exterior surfaces shall have a coating of paint with a dry film thickness not less thanthree mils. Each coat other than the finish coat shall have a minimum dry film thicknessof one mil. The first coat shall be applied immediately following cleaning and shall be arust inhibiting, barrier-type primer compatible with the finish coat.

18.3.2 The intermediate coat(s) may be either primer paint or finish paint. The finish coat ofpaint shall be semi-gloss alkyd enamel having a minimum dry film thickness of 1.5 mils.

18.3.3 The finish color shall be Light Gray ANSI #70, Munsell Notation 5BG 7.0/0.4 orequivalent, weather/corrosion resistant paint.

18.3.4 The exterior tank shall be completely painted before items are attached to it. Itemsattached to the tank (control boxes, conduits, etc.) shall also be painted separately awayfrom the tank. These attached items shall not block or hinder the exterior tank fromreceiving its full coat of paint.

18.4 The paint system shall provide complete protection of the base surface with satisfactorycolor retention under conditions of moderate atmospheric corrosion and temperatures upto 120°C. The paint shall remain impervious to electrical equipment insulating oil.

18.5 The transformer shall be furnished with one gallon of touch-up paint identical to theexterior final finish coat.




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18.6 Paint shall be of such quality that it meets or exceeds Proposed EEI FinishingRequirements, latest revision, and ANSI Standard C57.12.28-1988, latest revision, forpadmounted equipment.

19. NAMEPLATES AND CONNECTION PLATES

19.1 A non-corroding metal nameplate and connection plate shall be attached to eachtransformer with non-corroding metal fasteners in such position as to be clearly readableto a person operating the tap changer.

19.2 The nameplate marking shall comply with ANSI C57.12, and include month and year ofmanufacture.

20. ARRESTERS

20.1 Metal Oxide Varistor (MOV) type arrester shall be supplied for each 161 kV and 25 kVphase bushing.

20.2 Arresters to mount on the transformer.

20.3 Arrester mounting brackets to be drilled for 3-hole, 120° spacing on 10” and 8-3/4”mounting circles.

20.4 Arresters shall be shipped with the transformer.

20.5 Arresters shall include Anderson Electric Company connectors for both the phase andground ends.

20.6 Preferred Arresters – POLYMER ONLY. Provide the polymer equivalent for thefollowing:

20.6.1 Ohio Brass, Catalog #VN-219598, 98 kV MCOV, or approved equal arrester for 161 kVbushings.

20.6.2 Ohio Brass, Catalog #VL-219509, 8.4 kV MCOV, or approved equal arrester for 25 kVbushings. To be stacked with a shorting pin for 12 kV operation.

21. INSPECTIONS, TESTS, AND REPORTS

21.1 The transformer shall be completely assembled and tested at the factory for at least theitems listed below, in accordance with ANSI-C57.12 or latest revision.

21.1.1 The resistance of each winding, including the normal winding and at maximum andminimum taps corrected to 75°C.

21.1.2 Turns ratio for all sets of windings on each tap.




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21.1.3 Polarity and phase relation.

21.1.4 Iron loss and exciting current at rated voltage on the rated voltage connection.

21.1.5 Transformer will be designed to meet ANSI level impulse test (except FOW not required)on H, X, and Y windings. Tests may or may not be made based on costs of tests whichcan be quoted as an alternate.

21.1.6 Impedance and load loss at rated current on the rated voltage connection and on the tapextremes of the high voltage winding. This shall include impedance measurementsbetween each pair of windings in accordance with IEEE C57.12.90. Zero-phase-sequence impedance measurements shall also be included.

21.1.7 Temperature tests at the self-cooled rating and at the maximum kVA rating to assuresatisfactory performance of auxiliary cooling equipment.

21.1.8 Low frequency dielectric tests consisting of an applied potential test and an inducedpotential.

21.1.9 Corona Test (see paragraph 8.5). An induced voltage test at 1.5 times normal voltagewill be run for one hour. Corona will be monitored continuously during that period andrecorded once every five minutes. The corona level is not to exceed 150 micro-volts.

21.1.9.1 Meggar test of coils and core under oil. Report shall include the oil temperatureat which this test was made.

21.2 After tests are completed, the supplier shall furnish promptly five (5) copies of each testreport. These reports shall be furnished in time to be available for reference duringassembly and installation at the destination.

21.3 The test reports shall include the information called for in paragraph 15, pertaining tocalibration and checking of devices associated with cooling control and monitoring.

21.4 All test reports are to be certified by a professional engineer responsible for the tests andfor the test reports.

21.5 All tests shall be made on National Institute of Standards (NIST) traceable equipment perNIST Technical Document 1204. An equipment traceability statement shall be suppliedincluding the last calibration date and signed by a professional engineer with his seal.

21.6 Technical characteristics of the transformer shall be furnished on Technical Data sheetsof the type suggested in ANSI C57.12 for specification forms for power transformers.

21.7 Quality Control/Quality Assurance (QC/QA)




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21.7.1 A copy of the Quality Control and/or Quality Assurance program shall be supplied toHuntsville Utilities upon the receipt of an order.

21.7.2 A copy of the completed QC/QA program shall be submitted to Huntsville Utilities foreach unit ordered.

22. PHOTOGRAPHS

22.1 The following 8x10 inch photos are required. Photos may be black and white or color.

22.1.1 Front, back, and end views of completed core and coil assembly.

22.1.2 Close up views of upper and lower clamping structure.

22.1.3 Coils before assembly.

22.1.4 Core before assembly.

22.2 Photographs are to be delivered with the test reports.

23. DELIVERY DATE

23.1 Requested delivery date for the unit is specified on the purchase order.

24. SHIPPING INSTRUCTIONS

24.1 Supplier to determine origin point of shipment, method of transportation, and routing ofshipment. Proposal shall state method of shipment.

24.2 Shipping and Installation Marks:

24.2.1 All parts shall be adequately marked to facilitate installation.

24.2.2 Boxes and crates shall have a packing list enclosed showing the parts contained therein.

24.2.3 Each shipping box, crate, bundle, or component shall be tagged with Huntsville UtilitiesPurchase Order number.

24.3 The shipping will be Freight On Board (F.O.B.) Huntsville, Alabama, and ownership ofthe transformer will not change until accepted by Huntsville Utilities at the finaldestination.

24.4 Materials and equipment shall be prepared for shipment in such manner as to facilitatehandling and to protect them from damage in transit.




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24.5 Bushings shall be cleaned of foreign matter prior to shipment. A cover of polyethylene,or other material, of sufficient strength to withstand wind and weather conditions duringshipment shall be used to protect the bushings against contamination.

24.6 Rail Shipments:

24.6.1 Rail Shipment will be to:

Huntsville Utilities Electric Department% Southern Railroad Team TrackHuntsville, AL 35801

24.6.2 Shock Recorder (Impact Recorder)

24.6.2.1 The rail car shall be equipped with a sealed shock recording device (impactrecorder); this recorder to show the impact received in shipment both horizontally(longitudinally) and vertically.

24.6.2.2 The shock recorder shall be attached to the rail car with the power transformerprior to shipment.

24.6.2.3 The shock recorder shall be unsealed only in the presence of the HuntsvilleUtilities designated representative.

24.6.3 The shipper shall supply Huntsville Utilities the numbers of the rail car(s) used to shipthe transformer. This is to permit Huntsville Utilities to track the shipment, so thatunloading and/or installation can be coordinated with our crews and/or contractors asrequired.

24.7 Truck Shipment

24.7.1 Truck shipments shall be freight prepaid (F.O.B. destination basis) to the substationwhere the transformer is to be installed or to the electric warehouse address listed below:

Huntsville Utilities Electric Warehouse1145 Jordan RoadHuntsville, Alabama 35811

24.7.2 Truck shipments will be accepted between 7:00 AM and 3:00 PM, Monday thru Friday,excluding holidays.

24.8 The transformer will be shipped with all insulating oil removed. The case shall be sealedafter being filled with dry nitrogen gas under approximately 3 PSI to maintain positivepressure during shipment.

24.9 Oil Shipment




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24.9.1 Oil shipments shall be freight prepaid to the substation where the transformer is to beinstalled or to the electric warehouse address listed in 24.7.1.

24.9.2 Oil shipment shall be via tanker truck(s).

24.9.3 Oil shall be shipped heated.

24.9.4 The transformer manufacturer shall be responsible for all assembly work, oil processingand testing of the transformer after it has been laced on the foundation at the substationsite.

24.9.5 Testing (at site):

24.9.6 Perform core ground test

24.9.7 Perform winding ratio test at all tap positions.

24.9.8 Perform power factor test.

24.9.9 Perform Meggar tests.

24.9.10 Measure winding resistance of each winding at the rated tap positions.

24.9.11 Obtain oil sample and perform the following tests:

24.9.12 Dielectric Test

24.9.13 Moisture content

24.9.14 Interfacial tension

24.9.15 Power factor

24.9.16 Perform functional testing to verify proper operation of control circuits.

24.9.17 Three (3) copies of all certified (final destination) test reports shall be sent to:

Kim HensleyHuntsville Utilities112 Spragins StreetHuntsville, AL 35801

24.9.18 Oil shipment will be coordinated by Huntsville Utilities technical representative.

24.10 Notifications




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24.10.1 Huntsville Utilities to be given 24 hours notice before delivery of unit to allow forscheduling of crane services, equipment, and crews to unload the unit.

24.10.2 Notification telephone number is (256) 535-1395 or (256) 535-1322.

24.10.3 Notifications and shipment(s) will be accepted between 7:00 AM and 2:30 PM, Mondaythru Friday, excluding holidays.

24.11 Substation Site Deliveries

24.11.1Transformer, oil, and parts to be delivered direct to substation site will have thesubstation site address supplied after award.

24.11.2All substation sites are within Madison County, Alabama.

25. LOSS EVALUATION

25.1 The loss evaluation on this transformer will be an integral factor in the final selectionprocess.

25.2 The following performance information is to be furnished by the transformermanufacturer with the quotation.

25.2.1 No load losses in watts at OA rating at normal frequency and voltage.

25.2.2 Full load losses in watts at OA and FA ratings at normal frequency and voltage.

25.2.3 Auxiliary power requirements for cooling for additional capacity above the OA rating.

25.2.4 No load and full load reactive losses in vars at normal frequency and voltage. This datafor informational purposes and is not used in evaluation.

25.3 The method used is based on the following assumptions.

Transformer life ................................................. 30 yearsAverage cost of money ...................................... 10%Fixed cost rate .................................................... 19%Average annual load factor ................................ 45%Transformer loading factor ................................ 130%Average energy cost over 30 years .................... $0.045/KWH

25.4 The resulting mathematical equation is as follows:Cost of Ownership = 1.8 x Base Proposal Cost price

Plus 3.716 x No load losses (watts)Plus 1.272 x Load losses (watts)




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Plus 3.716 x Auxiliary losses (watts)Plus dress out cost

25.5 Huntsville Utilities will compare data obtained through a loss testing procedure with thedata provided by the manufacturer in the certified test reports. The manufacturer’scertified loss data must be within ±2% of data obtained by Huntsville Utilities.

25.6 If the loss data obtained by Huntsville Utilities’ testing is not within ±2% of themanufacturer’s certified loss data, Huntsville Utilities will take one or more of thefollowing corrective actions:

25.6.1 Conduct loss testing on the entire lot of transformers received by Huntsville Utilities withthe loss testing results being used in place of the certified loss data reported by themanufacturer. The cost of the loss testing shall be credited to Huntsville Utilities.

25.6.2 Reject the transformer and return the transformer to the manufacturer at themanufacturer’s expense.

25.6.3 Return the transformer to the manufacturer for verification of the loss test data by themanufacturer.

25.6.4 Subject the transformer to testing by a mutually agreed upon third party test laboratory.

25.7 If actions taken under Items 25.6 and 25.7 indicate that the supplier’s certified loss data isinaccurate, the respective manufacturer will bear the expense of the above action(s).

25.8 If the transformer losses exceed tolerances specified in ANSI Standards, HuntsvilleUtilities will require credit from the manufacturer equal to the present value of the addedcost of ownership for a 30-year period. The credit required shall be based on thedifference of the actual losses and quoted losses using the evaluation formula costs.

25.9 Evaluation shall include, but not limited to, Cost of Ownership, technical performance,and delivery.

25.10 In the event that the loss evaluation results in an evaluated cost difference that is equal toor less than the base proposal cost difference, Huntsville Utilities reserves the right toaward the transformer based on the cost of ownership or base proposal cost.

26.0 AWARDS

26.1 Huntsville Utilities final award includes but is not limited to loss evaluation, exceptions,purchase price, delivery, and service.

26.2 Huntsville Utilities reserves the right to make any award judged to be in its best interest.




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26.3 Huntsville Utilities reserves the right to award units to vendors that are not on theapproved manufacture’s list for this type of transformer.

26. INVOICES

27.1 All invoices issued shall show Huntsville Utilities Purchase Order (PO) number, themanufacturer’s order number and the serial number of the transformer being invoiced.

27.2 All of the materials required by this specification shall be delivered to Huntsville Utilitiesprior to invoices being approved for payment.

28. WARRANTY

A full five (5) year warranty from date of shipment on all workmanship and materialswill be provided.

29. TRANSFORMER DRESS OUT

29.1 The transformer manufacturer shall be responsible for all assembly work, oil processingand testing of the transformer after it has been placed on the foundation at the substationsite.

30. ALTERNATES WHICH MAY BE OFFERED

30.1 Alternates will not be a part of the loss evaluation.

30.2 Oil preservation method if other than inert gas.

30.3 Adder for ANSI level impulse tests (except FOW).

30.4 Adder for an extra 161 kV bushing. Spare bushing, if ordered, shall ship with thetransformer.

30.5 Adder for an extra 25 kV bushing. Spare bushing, if ordered, shall ship with thetransformer.

30.6 Adder for unloading the transformer from the rail car at destination rail siding or truckdestination and transporting the transformer to the substation site and place transformeron foundation to be furnished by Huntsville Utilities.

31. EXCEPTIONS

31.1 Exceptions to the specifications shall be specifically and clearly stated on a separatesheet(s) and the item referenced.




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31.2 Each sheet used for exceptions shall be clearly labeled as an exception sheet to thesespecifications.

31.3 Unacceptable exceptions to these specifications may be grounds for rejection of a bid.

31.4 Exceptions shall include catalog data sheets for proposed alternates.

31.5 The SUPPLIER bears the responsibility for Approval drawings conforming to thesespecifications. Again, exceptions are to be clearly stated and on a separate sheet.Approved Approval drawings does not release the SUPPLIER from meeting thesespecifications if exceptions/deviations are not clearly stated and listed on a separate sheet.

32. PROPOSAL SUBMISSIONS

32.1 Proposals are to be submitted in duplicate.

32.2 Proposals are to be submitted with the attached Technical Proposal form completed.

32.3 Failure to submit a completed form will be grounds for rejection of bid.

32.4 Technical Proposal sheets may be photocopied for placement in your proposal.




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TECHNICAL PROPOSAL FORM 161/25X12 kV 25/33/41 MVA TRANSFORMER

1. Item 24, Loss data:

No Load Losses:______________ watts Full Load Losses: _____________ watts

Total Losses: ________________ watts Auxiliary Losses: _____________ watts

No Load Reactive Losses: ______ vars Full Load Reactive Losses: _____ vars

2. Item 2.3, Are you taking exception to the drawing dimensions? YES___ NO___

3. Item 10, Have you proposed bushings that are different then those that are specified?

YES___ NO___

4. Item 10, Whose bushings are you proposing? ______________

5. Item 10.11, Have you included these clamps in your cost? YES___ NO___

6. Item 11, Are you taking exception to the CT’s specified? YES___ NO___

7. Item 13.10, Does the proposed unit meet the dimension requirements? YES___ NO___


9. Item 18, Have you taken exception to the paint specification? YES___ NO___

10. Item 18.2, Whose interior paint are you proposing? ______________

11. Item 18.2, What kind of interior paint are you proposing? ______________

12. Item 18.3, Whose exterior paint are you proposing? ______________

13. Item 18.3, What kind of exterior paint are you proposing? ______________

14. Item 12.7.6, Whose insulating oil are you proposing? ______________

15. Item 12.7.6, What is their brand name for the insulating oil? ______________

16. Item 20, Have you proposed arresters that are different than those that are specified?

` YES___ NO___





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18. Item 28, Are you taking exception to the warranty specified? YES___ NO___

19. Item 30, Are you proposing any of the alternates specified? YES___ NO___

19.1 Item 30.2, Oil preservation method if other than inert gas. ______________

19.2 Item 30.3, Adder for ANSI level impulse tests (except FOW). ______________

19.3 Item 30.4, Adder for an extra 161 kV bushing. ______________

19.4 Item 30.5, Adder for an extra 25 kV bushing. ______________

19.5 Item 30.6, Adder for transporting transformer to substation site and placing on foundations

______________

20. Item 24.1, How is the proposed unit to be shipped? ______________

21. Item 24, Are you proposing to ship part of the unit by other than rail? YES___ NO___

If so, which parts and what form of transportation? ______________

22. Have you taken any exceptions to these specifications? YES___ NO___

If yes, have you attached explanation sheets? YES___ NO___

23. Base Proposal Cost for the quantities as follows:

One (1) Transformer ____________ Two (2) Transformers _____________

24. Proposal shall remain firm for a period of ______________________________

25. Delivery After Receipt of Order (A.R.O.): ___________________

Submitted by: _____________________ ___________________________Firm Signature

_____________________ ___________________________Address Name

_____________________ ___________________________E-Mail Date

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