240528_CoG_New_Sunshine_Xfmr_Spec-_For_Bid_Purposes_(2).pdf

New Sunshine Substation Transformer (For Bid Purposes)

EQUIPMENT SPECIFICATIONS

POWER TRANSFORMER

New Sunshine Substation

City of Gallup Electrical Utilities

Gallup, NM

9550 SAN MATEO BLVD. NE

Suite G Albuquerque, New Mexico 87113

(505) 344-4234

May 28, 2024

City of Gallup Electric Utilities New Sunshine Substation

115 – 7.62/13.2 kV POWER TRANSFORMER 15/20/25 MVA w/ LTC

PART 1 GENERAL

1.1 GENERAL

Provide one (1) 115 kV – 7.62/13.2 kV, three-phase delta-wye connected power transformer for use in an electric substation serving a utility scale distribution facility along with distribution system loads for the City of Gallup Electric Utilities (COG) (hereinafter call “THE OWNER”). This transformer shall be used as a substation step-down transformer that may also be paralleled on the low voltage side for load transfer operations. The transformer will be connected to an overhead distribution feeder bay located adjacent to the oil containment system for the transformer. Low voltage connections will utilize open wire jumpers to connect to the switching devices and phase connections. As such, the layout of the transformer will need to be designed to facilitate these connections.

1.2 QUALITY ASSURANCE

The Manufacturer shall design, manufacture, and factory test the oil filled transformer in accordance with this specification and applicable sections of the latest revisions of the following, unless otherwise specified: American National Standards Institute (ANSI)/Institute of Electrical and Electronics Engineers (IEEE) C57 standards. National Electrical Manufacturers Association (NEMA) and Uniform Building Code (UBC).

1.3 SUBMITTALS

A. Submit the following with the bid:

1. Completely filled out appendix 1 data section (attachment to this specification) including the following data:

a. Price for the transformer, oil, and accessories delivered f.o.b.

foundation or nearby storage facility, New Sunshine Substation, Gallup, NM. Services of Manufacturer’s field engineer to oversee assembly and testing of transformer at the site shall be included and will be coordinated by the Owner at a time to be determined later. Costs for these efforts shall be included with this proposal.

Price listing to include allowances for two people to observe the transformer being tested at the factory. (Travel, room, board, etc.

to be paid for by Owner.)

b. Price for the following required tests:

1) Insulation power factor tests per Doble standard test procedure and IEEE Paper Number 71TP536-PWR.

Include the actual bushings, installed in the transformer, during the power factor tests. Report the results to THE OWNER. At 10 kV the transformer must have an acceptable power factor rating of 0.5 percent or less at 20°C.

2) Provide temperature tests per ANSI C57.12.90.

3) Provide an induced voltage test appropriate for a Class 2 power transformer including both partial discharge (pC) and RIV (µV) measurements as per ANSI C57.12.90.

4) Excitation current tests at 100, 105, and 110 percent of rated voltage.

5) Perform dissolved gas analysis on the transformer oil before and immediately after all the following tests:

a) Insulation power factor test

b) Heat run

c) Induced voltage test

d) Excitation test

e) Sound level test (if required)

c. Price adder, if any, for a 5 yr. warranty if beyond standard warranty period including full in/out coverage.

d. Price adders for the following optional test:

1) Sound level test

e. Provide typical paper and electronic instruction book(s) and appropriate drawings (electronic drawings in AutoCAD 2018 (*.dwg) (*.dxf files are not acceptable) and electronic instructions in MS Word or PDF) detailing receiving, handling, assembly, receiving inspection, routine inspection, and maintenance of the transformer with the following details:

1) List of items assembled and shipped in place with the transformer.

2) List of items to be assembled in the field.

3) List of freestanding accessories requiring separate foundations.

4) List of major items assembled/shipped with transformer.

5) Estimated total man-hours required to assemble the entire transformer on-site.

6) An outline of the transformer configuration (giving overall dimensions, center lines, and weights).

7) Recommended spare parts list.

f. 125 VDC power requirements (in VA).

g. 120/240 VAC power requirements (in kVA).

h. Complete positive and zero sequence impedances and equivalent circuits with supporting calculations.

i. Delivery schedule.

j. The transformer shall be optimally designed to the following system cost rates with no-load losses to be evaluated at 20 deg C ambient temperature and load losses at 75 deg C (ONAN rating using 55 deg C temperature rise over a 20 deg C ambient temperature:

a) No-load loss rate = $3500 per kW

b) Load loss rate = $5000 per kW

c) Auxiliary loss rate = $2000 per kW

If actual losses exceed the guaranteed losses, as determined by tests performed in accordance to the applicable provisions of ANSI Standard Test Code C57.12.90, Section 4, "Transformers, Regulators, and Reactors," THE OWNER shall have the right to either reject the equipment or to accept the equipment under certain conditions. These are provided (1) that the Manufacturer shall pay THE OWNER a negotiated amount to compensate for the excess losses, and (2) that the temperature rise performance shall not exceed, as confirmed by actual test, that proposed and guaranteed in the proposal. THE OWNER will not credit the Manufacturer for loss performance less than that guaranteed.

B. After Receipt of Order (ARO) submit at least the following:

1. Within 6 weeks ARO submit an electronic set of physical drawings, control schematic and wiring diagrams, and associated data for review. Provide notification (via e-mail) that this information has been submitted and send the information to the T&D Services Project Engineer/Manager listed in section 1.4E. The drawings shall be in AutoCAD 2018 (*.dwg) (*.dxf files are not acceptable) (outline drawing must be to actual scale). The other information may be in MS Word or Acrobat formats. Information shall include at least the following:

a. Three-line elementary of equipment.

b. Provide actual control wiring connection diagrams, not typical diagrams. Do not use a wire numbering scheme use only a point-to-point wiring scheme.

c. Transformer control cabinet terminal blocks and connections.

d. AC Control Schematics & connected load kVA

e. DC Control Schematics & connected load VA

f. Scale outline and sectional views with parts labeled and dimensions.

g. Information for foundation design including total weight and center of gravity.

h. Bushing and surge arrester information.

i. CT information including excitation curves.

j. Operation and maintenance instructions

k. Preliminary transformer nameplate.

2. Prior to shipment, submit three paper and two electronic sets of final physical drawings, final control schematic and wiring diagrams, final instruction manuals, certified test reports, etc. Provide notification (via e-mail) that this information has been shipped and send one set of drawings and documents to the Project Engineer listed in section 1.4E. The rest of the drawings and instruction books shall be sent to the OWNER. The drawings shall be in AutoCAD 2018. The other information may be in MS Word or Acrobat formats. Information shall include at least the following:

a. Certified drawings containing design, outline dimensions, and wiring diagrams, schematics, etc.

b. Complete sets of sectional views of bushings and surge arresters with parts labeled.

c. Complete set of instruction and operating manuals for the main transformer and all control and misc. components.

d. Characteristics and ratio correction curves for bushing current transformers.

e. Recommended spare parts list.

f. Current transformer nameplate for each ratio CT.

g. All certified test reports and a copy of the final filled out nameplate for the power transformer.

h. All certifications signed by manufacturers that their products comply with the specified requirements.

i. 2 copies of certified test reports

j. Surge arrester outline drawings including all rating information

3. Specify "no-load”, “load”, “auxiliary”, and “total” losses and furnish data upon testing the transformer. Test according to ANSI-C57.12. Auxiliary losses are to be at the stated ONAN rating of the unit.

a. THE OWNER will evaluate the no-load losses with the test voltage at 100 percent voltage and the no load tap in the neutral position.

THE OWNER will evaluate no-load losses at 20°C.

b. THE OWNER will evaluate the load losses at ONAN rating assuming short circuit applied across either the high voltage windings or the low voltage windings and applying sufficient voltage across the other windings to cause 100 percent of rated current to flow in the windings and with the no load tap in the neutral position.

Correct load losses for 75°C (55° rise over 20°C ambient) operation.

4. Prior to shipment, notify THE OWNER of any requirements for delivery and unloading of the transformer, including open area requirements and specific requirements for extended storage of unit(s), if any.

1.4 DELIVERY, STORAGE, AND HANDLING

A. Ship the transformer, transformer oil, and transformer accessories F.O.B to COG New Sunshine Substation and offload onto the transformer foundation or storage location provided by others. Seller is responsible for all shipping permits. If two or more transport vehicles are used, they must arrive together. If possible, ship the transformers filled with oil. The seller shall coordinate with the Owner regarding any oil filling of the transformer(s) at the site and any oil processing equipment for necessary to place the units in storage should it become necessary to do so.

B. Transformer shipping method as determined by shipping weight, in order of preference is:

1. Truck shipment, oil filled. Make-up oil shipped in drums or totes.

2. Truck shipment, dry breathing air filled. Insulating oil shipped via tank truck.

3. Rail shipment, oil-filled. Make-up oil shipped in drums or totes.

C. All shipments shall be monitored by impact recorders specifically designed for that mode of transportation.

1. If the unit is to be shipped by truck, it shall be equipped with at least one impact recorder mounted and operating from the time the transformer leaves the factory.

2. If the unit is to be shipped by rail, it shall be equipped with two, three-axis impact recorders mounted and operating from the time the transformer leaves the factory. Mount the two impact recorders as follows:

a. One on the rail car bed.

b. One on the main tank.

D. An internal inspection at no additional cost to THE OWNER will be required if:

1. Via truck the impact recorder fails to record the entire trip or via rail both impact recorders fail to record the entire trip.

2. Either recorder indicates a horizontal impact above zone 3.

3. Visible load shifting on the rail car or truck.

E. Notification List Notify the following people at each notification milestone listed below:

Chuck Nourse Electric Utilities Director City of Gallup Telephone Number: (505) 863-1373 Email: cnourse@gallupnm.gov

Kenny Adams, PE Director of Station Engineering

T&D SERVICES, LLC

Telephone Number: 505-344-4234 Cell Number 505-803-5032 kadams@t-d-services.com

F. Six Week Notification Provide the following information about six weeks before shipment:

1. At least two copies of a complete bill of material.

2. Detailed receiving, handling, and storage instructions.

3. Departure dates.

4. Estimated dates of arrival.

G. Two Week Notification The Seller shall send the following approximately 14 days before shipment and provide the following information on the faxes and e-mail:

1. Name of Carrier

2. Route.

3. Departure dates.

4. Estimated dates of arrival.

5. Detailed packing lists for each shipment.

H. One Week Notification The Seller shall send the following approximately seven days before shipment and provide the following information on the faxes:

1. Name of Carrier

2. Route.

3. Departure dates.

4. Estimated dates of arrival.

5. A contact person's name and telephone number that will know the daily status of the transformer location.

I. Shipment Day Notification The Seller shall send the following on the day of shipment and provide the following information on the faxes:

mailto:cnourse@gallupnm.gov mailto:kadams@t-d-services.com

1. Name of Carrier

2. Route.

3. Trucking line pro-numbers and routing.

4. Departure dates.

5. Estimated dates of arrival.

6. A contact person's name and telephone number that will know the daily status of the transformer location.

J. 24 Hours Before Delivery The Seller shall notify the Owner and the Engineer 24 hours before delivery of the transformer.

1.5 WARRANTY

A. Manufacturer shall, at his expense, repair and replace any equipment or component for failure to conform to this specification, failure, or any defect in workmanship or design.

B. Warranty shall be for a period of at least five (5) years after energization of the transformer or 66 months after shipment.

1.6 APPROVED MANUFACTURERS

• ABB/Hitachi

• SPX Waukesha

• Delta-Star Transformers

• Virginia/Georgia Power Transformers USA

• WEG Transformers USA

• Howard Industries

• SGB-SMIT USA (Ohio Transformers)

• GE Grid Solutions

Transformers and related components shall be sourced, manufactured and tested in the United States of America in accordance with the Owner’s Procurement Policies.

Transformer

2.1 RATINGS

A. Ratings for Transformer shall be as designated below:

• ONAN output at 55°C and 65°C 18,000 kVA 16,800 kVA

• ONAN/ONAF output at 55°C and 65°C 20,000 kVA 22,400 kVA

• ONAN/ONAF/ONAF 25,000 kVA 28,000 kVA Output at 55°C and 65°C

B. Average winding temperature rise 55°C C. Insulation class 65°C D. Frequency 60 Hertz E. Phases/Windings 3/2 F. High voltage rating 115 kV G. High voltage connection Delta H. Low voltage rating 13,200/7,620 Volts I. Low voltage connection Grounded Wye J. Impedance (on 18 MVA base) 8% Maximum

(Target 7.86% to match the unit to be paralleled with during load transfers.)

K. Basic impulse insulation level

• High voltage (Internal) 550 kV

• High voltage (External) 550 kV

• Low voltage 110 kV

• Neutral 110 kV

L. Environmental Conditions

• Elevation 7000 feet

• Wind 90 MPH Maximum

• Temperature Range -40º F -- 115º F

• Seismic Zone UBC Zone 2A

• NESC Loading District Medium

• Air Quality Dusty

Size all auxiliary components and other construction features such that they will not limit the loading to less than the full capability of the windings.

Transformer shall withstand lateral seismic forces generated by a ground acceleration of 0.1g.

2.2 LOAD TAP CHANGING EQUIPMENT

A. Ratings:

1. Voltage Regulation (at low voltage terminals): ±10%

2. Number of Steps: 33 (16 raise, 16 lower, neutral)

3. Voltage Change per Step (Above/below neutral): 5/8%

4. LTC Operations Between Contact Replacement 500,000

5. LTC Delivery Capacity At or Above Rated Secondary Voltage Rated Transformer kVA

6. LTC Delivery Capacity below rated secondary voltage Rated Ampacity

7. LTC Type Reactance Bridging

B. The load tap changing equipment shall withstand the same short circuit requirements as the main transformer. Reactance type load tap changer.

Design or test the LTC to the C57.131 standard.

C. Fully distributed regulating winding. Manufacture regulating and series windings to the same standards as the main core and coil assembly.

D. The power required to drive the mechanism will be obtained from an external control power source of 120/240 volts. Locate LTC drive motor at operator level.

E. Terminals for 120 volt potential for the voltage regulating relay.

F. Wire and label the tap changer controls so that "Raise" and "Lower" indications refer to the high voltage side of the transformer.

G. The load tap changer tank shall include all standard features with the same manufacturing standards as the main tank, including but not limited to the following:

1. Position indicator reading 16L-N-16R, externally visible from ground level

2. Fill and drain valves.

3. Connection for vacuum line 3" NPT.

4. Sudden pressure relay for the LTC tank equipped with dry low-level alarm and trip contacts.

5. Liquid level indicator for the LTC tank with dry low-level alarm and trip contacts.

6. Mechanical pressure relief device with automatic reset and reseal, dry alarm and trip contacts, and direct mechanical indicator.

7. Rate all coils and contacts for 125 VDC operation.

8. 24" diameter manhole for inspections without lowering the oil level.

9. Make tank completely vacuum proof without requiring bypass piping.

10. Self-maintaining or heater-equipped silica-gel breather at operator level mounted such that it is clearly visible.

H. The load tap changer control compartment shall include all standard features, including but not limited to the following:

1. Circuit breakers for motor and control protection.

2. A readily accessible terminal board in a readily accessible compartment for termination of wiring and installation of controls. Lay out the terminal blocks in a logical manner.

3. Locate the bottom of the compartment at least two feet above the base of the transformer.

4. Three-point latching system on the door(s).

5. Door-activated light.

6. Compartment lighting with safety globe/covering, and 20 amp, 120-volt duplex GFI receptacle.

7. Operation counter at operator level.

8. Automatic control for the load tap changer.

9. Control compartment heater with thermostat.

10. Limit switches and mechanical stops to prevent travel beyond extreme tap positions.

I. The automatic control for the load tap changer shall include all standard features, including but not limited to the following:

1. Microprocessor based tap-changing control. Beckwith Electric Company model M-2001D. The M-2001D shall be equipped with Delta Var Peer-to- Peer paralleling capabilities, ST fiber serial communications, fiber optic ST 100 Base-FX ethernet communications, standard serial protocols, backup control power input. (Part # M-2001D-6L4S20FUPB0)

2. Local Parallel/Independent mode switch wired to M-2001D digital input.

3. DC-DC converter for backup LTC control power supply. External provided

130 VDC input to 12 VDC output. Beckwith M-2026. External DC power contacts wired out to labeled and logically located terminal blocks.

4. Local auto/manual switch paralleled with SCADA equivalents.

Auto/manual status wired to M-2001D.

5. Local SCADA cutoff switch capable of defeating external SCADA control contacts. SCADA cutoff switch status wired to M-2001D digital input.

6. Local raise and lower switches paralleled with external SCADA equivalents for manual operation.

7. Control and adjustable time delay relays.

8. LTC neutral tap status wired to M-2001D digital input.

9. Line drop compensator with resistance and reactance adjustments.

10. Reactance reversing switch.

11. Current transformer for line drop compensator and paralleling.

12. Voltage testing terminals.

13. Adjustable bandwidth control.

14. Adjustable voltage level.

15. Voltage limit control. Manufacturer: Beckwith model M-0329B.

16. Tap position indication monitor, INCON Model 1250-LTC or approved equivalent, with combination of Beckwith M-2025B current loop interface module providing positive feedback to M-2001D.

17. Externally provided SCADA contacts wired out to labeled and logically located terminal blocks for customer connections. Contacts to allow at least the following:

a. Lowering or raising the voltage.

b. Voltage reduction in at least two steps. (Paralleled with local contacts).

c. Automatic or manual operation.

18. External supplied breaker status contacts for up to three breakers wetted by LTC control circuit voltage and wired to M-2001D LTC control digital inputs. External breaker status contacts wired out to labeled and logically located terminal blocks.

2.3 BUSHINGS

A. Bushings in accordance with ANSI C76.1a. Sky gray, ANSI-70 in color.

Condenser type bushings with porcelain enclosing the lower end and oil level gauge near the top of the bushing.

B. Provide top-mounted high voltage bushings. On the side opposite high voltage bushings provide top-mounted low voltage bushings and top-mounted neutral bushing. Bring out the core ground through an appropriate top-mounted bushing.

C. Use draw-lead type bushings for both the high and low voltage sides of the transformer. All bushings that are not of the draw-lead type shall be shipped factory installed.

D. Low voltage bushings shall be top-mounted on segment 3.

E. Bushing terminals shall be tinned, standard bolted bronze stud connectors compatible with the maximum current rating of the bushing and the bushing threaded stud. Manufacturer will supply (phase terminals) Anderson catalog number HDSF-XX-X-X-X/X-XX, (neutral terminal) Anderson catalog number D2S- XXXXX-XX to match the bushing stud size and ampacity.

2.4 CORE AND COILS

A. Core Construction

1. Step-lap core construction is required. All cores must use a mitered-core design. The edges of the laminations on all exposed parts of the core, including the underside of the top yoke and the insides of the core legs, shall be protected against rust with permanent rust inhibiting paint. On the top yoke, the paint shall be non-bonding.

2. The top and bottom yokes shall be continuous, except for building joints.

Every core step shall be supported by inserting a non-conductive material between the core step and the base bar that connects the core clamps.

The bottom and top of every core step, in every direction, shall be supported from a base bar that connects to the low voltage and high voltage core clamps. Every core step shall also be supported at the ends.

3. Make all internal joints using demonstratively reliable methods. Bolting through the core steel is not acceptable. The design of the bottom core clamps and the tank shall allow inspection of the underside of the bottom yoke after assembly.

4. The core clamping structure shall rigidly hold the core in place to form a sturdy unit structure, which shall protect the core and the windings from mechanical damage due to shipping accelerations or repeated short-circuits.

5. All steel components of the core clamping structure shall be shot blasted prior to construction to remove all rust and mill scale. All corners of the core-clamping structure which are in close proximity to the windings shall be rounded to minimize Radio Interference Voltages (RIV).

B. Winding Design

1. Provide windings that are self-protecting, designed for infinite bus, and totally oil-immersed.

2. Windings shall be copper with thermally upgraded paper insulation.

(Suitable for a hot spot temperature up to 120° C under daily cyclic loading).

3. The main transformer core and coil shall be of circular type construction.

The main transformer high voltage coils shall be of disc or helical type construction. The low voltage winding can be disc or helical.

4. Provide windings that are self-protecting, designed for infinite bus, and totally oil immersed.

5. All conductors shall be clean, shall be free from oxide or scale, and shall have all rough or high points smoothed to remove burrs and/or slivers.

6. At a minimum, the outside two (2) layers of conductor insulation on all strap conductors shall be Dennison paper 22HCC or equivalent.

7. The insulating paper shall be applied in either single or multiple strands in such a manner that there are 30% overlap between paper layers.

8. All brazed connections in CTC shall be strand-to-strand, i.e., each strand shall be individually brazed and installed.

9. The winding hot-spot shall be the most limiting factor that determines transformer loading. No other accessory or component such as leads or connections shall limit the loading capability. The hot-spot of the leads for an individual winding shall not exceed the maximum hot-spot in that winding.

10. All leads shall be clamped with blocks. Ties and tie-wraps shall not be used.

11. Sheet and layer wound construction methods are not acceptable.

C. Core/Coil Documentation Supplier shall provide a complete set of digital pictures showing core and coil assemblies prior to tank installation for the Owner’s permanent records.

Manufacturer shall forward digital copies of photos as soon as they are available to both the Engineer and the Owner at the email addresses to be provided after order.

2.5 HIGH VOLTAGE TAPS

No Load Tap Changer (NLTC): Two -- 2 1/2 percent steps above and below nominal high voltage rating with pad-lockable externally operated manual tap changer handle. The NLTC handle shall be accessible from ground level with permanently marked tap positions.

2.6 TANK DESIGN

A. Shall withstand filling with oil under full vacuum without permanent distortion.

B. All-welded type construction.

C. Sealed tubular bracing.

D. Cover with lifting eyes.

E. Provisions for lifting core and coil assembly from tank.

F. Base designed for rolling or skidding parallel to either centerline.

G. Pulling eyes to provide for pulling in either direction along either centerline.

H. Lifting lugs for lifting complete transformer.

I. Jack bosses allowing 13 inches of clearance from bottom of base for raising the complete transformer.

J. Domed shape cover with a non-slip finish. Weld cover to tank.

K. Install valves for draining and removal of radiators while keeping main tank filled.

L. Twenty-four inch diameter round manhole covers. The manholes shall provide access to at least the lower ends of the bushings, terminals, and upper portions of the coil.

M. Supply nameplate(s) in accordance with ANSI-C57.12.00 (Nameplate C).

N. Install one three-inch NPT female threaded opening in top of main tank for vacuum filling located diametrically opposite the filter-press inlet. Furnish with an extra-heavy capped nipple.

O. Two-inch globe valves for complete tank drain, filter-press outlet, filter-press inlet, and sampling point.

P. Mounting flange for a transformer tether pole (fall protection post) complete with mounting hardware. This device shall comply with OSHA 1926.104.

Q. One complete set of gaskets for each different size of manhole, handhole, radiator, etc. unless furnished with reusable gaskets.

R. Use nitrile butadiene rubber for all gaskets in contact with oil-bearing surfaces.

Raise all gasket surfaces above surrounding surfaces. Machine gasket surfaces and include recessed grooves to contain gaskets.

S. Permanently mark the centerlines of tank on the base of all four sides of the transformer.

T. H2 and X2 bushing placement shall be aligned to the tank centerline.

2.7 FINISH AND PAINTING

A. Follow coating manufacturer’s recommendations in preparing metal surfaces for painting.

B. Thoroughly clean all surfaces and remove impurities, burrs, rough edges, weld scale, weld flux residues, and weld splatter before painting.

C. Coating shall consist of a primer coat and a second and finish coat of the final color. Paint the exterior of tanks, compartments, pipes, and radiators with ANSI 70 Light Gray.

D. Paint the interior of all tanks and compartments white.

2.8 ACCESSORIES

Provide the following accessories:

A. Locate compartment bottoms a minimum of two feet above transformer base.

Locate gauges a maximum of six feet above the transformer base.

B. Mount a weatherproof, deadfront control cabinet that is free of vibration from the main transformer tank in either segment 1 or 2.

C. Mount the gland plate for control conduits on the inside of the control compartment and clearly dimension center of plate to transformer centerlines.

D. Thermostatically controlled or self-regulating space heaters.

E. One 20 Amp, 120 VAC GFI duplex convenience outlet.

F. Internal lighting in the control cabinet, either on door switch or light switch.

G. Label and terminate control and alarm contacts on terminal blocks in the control cabinet in a logical manner. The Engineer will review this arrangement.

H. The panel-wiring diagram shall show available “dry” and “wet” contacts separately, and in a manner acceptable to the Engineer.

I. Rate contacts for 125 VDC operation.

J. Dial-type liquid temperature indicator (Qualitrol 104 series) with at least four adjustable alarm contacts that are accessible by a removable front cover. Provide at least two contacts for THE OWNER’s use. Provide a relay that is removable for field-testing. Terminate contact wiring in the control cabinet. Mount the indicator six feet above the transformer base.

K. Analog electrical (such as 4-20 mA) liquid temperature indicator for SCADA.

Indicator relay that is removable for field-testing. Terminate wiring in the control cabinet.

L. Dial-type winding temperature indicator (Qualitrol 104 series) with at least four adjustable contacts. At least two contacts for THE OWNER’s use. Relay to be removable for field-testing and have adjustable contacts accessible by a removable front cover. Terminate contact wiring in the control cabinet. Mount the indicator six feet above the transformer base.

M. Analog electrical (such as 4-20 mA) winding temperature indicator for SCADA.

Provide an indicator relay that is removable for field-testing. Terminate wiring in the control cabinet.

N. Vacuum-pressure gauge (Qualitrol) with adjustable alarm contacts for both low and high transformer tank pressures.

O. Analog electrical (such as 4-20 mA) vacuum-pressure indicator for SCADA.

Provide an indicator relay that is removable for field-testing. Provide a transducer that is easily removable for field testing and calibration. Terminate wiring in the control cabinet.

P. Pressure gauge with adjustable alarm contact for low nitrogen bottle.

Q. Magnetic liquid level gauge (Qualitrol CAS-979-1) with dry low-level alarm and trip contacts.

R. A mechanical pressure relief device with automatic reseal, dry alarm and trip contacts, and direct mechanical indication. Provide a shroud for this device to limit oil spread to a minimum

S. Fault pressure relay (Qualitrol Model Number 900-014-02) mounted under oil with an auxiliary relay assembly for seal-in operation having both dry alarm and trip contacts. (Qualitrol Model Number 909-210-01)

T. Loss of AC power and loss of DC power voltage relays.

U. Polycarbonate lenses on all gauges and indicators.

V. Use only rigid, galvanized, metallic conduit externally. Flexible conduit is not allowed with the exception of short lengths for final fan connection raceways.

W. Furnish a minimum of two (2) 16-ounce spray cans of matching exterior touch-up paint. Provide one (1) Material Safety Data Sheet with each can of touch-up paint.

X. Furnish a minimum of one (1) 16-ounce spray can of matching cabinet interior white touch-up paint. Provide one (1) Material Safety Data Sheet with each can of touch-up paint.

2.9 GROUNDING

A. Provide multiple ground pads each with two protected, tapped, NEMA spaced holes on the transformer tank. Weld one grounding pad near the base at each corner of the tank. Weld the fifth pad near the neutral bushing and the sixth near the core ground bushing. Furnish bronze clamp type grounding terminals suitable for the clamping of two 1/0 - 500 MCM Copper cables for each pad. Manufacturer:

Anderson Number SWHD-050-B2 terminals.

B. Provide suitable clamps to route the grounding conductor (1/0-500 MCM Copper) from a pad on one corner on the high side of the tank, through the high voltage lightning arrester ground connections, and down to the other pad on the high side.

This arrangement will provide a grounding loop for the high side arresters.

C. Provide clamps on the low voltage side of the transformer through which to route two runs of grounding conductor (1/0-500 MCM Copper). Route one from the nearest corner pad on the bottom of the tank through to the neutral bushing connection then onto the core ground connection. Route the second for grounding of the low side arresters in a loop similar to the high side arresters.

2.10 CURRENT TRANSFORMERS

A. Equip each high voltage bushing with one 600:5 Amp, Class C400 multi-ratio current transformer with thermal rating factor of at least 1.0.

B. Equip each low voltage bushing with one 1500:5 Amp, Class C400 multi-ratio current transformer with thermal rating factor of at least 1.5.

C. Equip the neutral bushing with two 1500:5 Amp Class C400 multi-ratio current transformer with a thermal rating factor of at least 1.0.

D. Current transformers shall comply with ANSI Standard C57.13. Multi-ratio current transformers shall have taps and ratios as shown in Table 10 of C57.13 for the corresponding current rating.

2.11 SURGE ARRESTERS

A. High Voltage Arresters

1. Provide three tank-mounted station class, metal oxide, polymer housed surge arresters suitable for use on 115 kV systems. Ratings shall be 74 kV MCOV for use on a solidly grounded system. Surge arresters shall have rating suitable for use at elevations up to 7000 feet.

2. Provide a standard NEMA 4-hole pad top connector.

3. Provide surge arrester mounting brackets adjacent to the H1, H2 and H3 bushings. Elevate the arrester top such that it is even with the associated H1, H2, & H3 bushing tops.

4. Attach clamp-type ground terminal to the base of each HV surge arrester through which to route the grounding conductor (1/0-500 MCM Copper).

B. Low Voltage Arresters

1. Provide three tank-mounted station class, metal oxide, polymer housed surge arresters suitable for use on 13.2 kV systems. Ratings shall be 8.4 kV MCOV for use on a solidly grounded system. Surge arresters shall have rating suitable for use at elevations up to 7000 feet.

2. Provide standard NEMA 4-hole pad top connectors.

3. Provide clamp-type ground terminal to the base of each LV surge arrester through which to route the grounding conductor (1/0-500 MCM Copper).

Provide the conductor and route to ground pads located in the air terminal chamber.

2.12 CONTROLS AND WIRING

A. Enclose electrical wiring between permanently mounted accessories and the control cabinet in galvanized, rigid steel conduit. Securely fasten the conduit to the transformer tank in a manner to prevent mechanical damage or vibration.

Provide interconnecting raceway between the conduit and the fan motors that is liquid-tight, flexible metal conduit with sunlight resistant jacket. Provide conduit joints and fittings that are dust and watertight.

B. Control, auxiliary power, and alarm circuit wiring shall be 600 volt, #12 AWG, stranded copper conductor. Current transformer circuit wiring shall be 600 volt, #10 AWG, stranded copper conductor with continuous runs, without splices in the wire. Provide control wiring that is oil resistant. Wiring shall pass the IPCEA Flame Resisting Test, IPCEA S-61-402, Section 6.5. Use hinge-type wiring for connections to swinging panels.

C. Bring connections to external circuits to the terminal blocks within the control cabinet. Group and separate all terminal block points and associated wiring as to low voltage power, low voltage instrumentation and control, and low-level signal.

D. Provide non-shorting terminal blocks for low voltage control and instrumentation.

Manufacturer: GE Type EB-25-12, or Marathon type 1512-DJ.

E. Provide shorting type terminal blocks for current transformer secondary circuits.

Terminate CT taps and a ground for each CT on one terminal block.

Manufacturer: GE Type EB-27-06-S, or Marathon 1506-SC.

F. Provide terminal blocks for AC and DC power connections (Marathon).

Manufacturer: Marathon 1422123.

G. Provide washer head screws in all terminal blocks with heads for straight blade screwdrivers only. Screws allowing for both Phillips head and straight blade screwdrivers are unacceptable.

H. Connect wiring to terminal blocks and device studs with compression barrel, ring-type lugs. Use ratcheting type crimping tools for installing the ring lugs.

I. All control, instrumentation, and power terminal blocks shall have at least 20 percent spare positions. This requirement is not necessary for CT shorting blocks.

Position terminal blocks to allow unrestricted access to the terminal points and associated wiring. Provide sufficient cabinet space for field cables to avoid cable bunching or stacking between the terminal blocks and the cabinet cable entries.

J. Rate auxiliary equipment controls for operation on an integral 120/240-Volt AC system. The AC rated equipment shall operate satisfactorily with a supply voltage regulation of plus or minus 10 percent of nominal. Rate annunciator and protective equipment controls for operation at 125-Volt DC supply. DC rated equipment shall operate satisfactorily with a supply voltage variation between 80% and 125% of nominal.

2.13 COOLING EQUIPMENT

A. Design the transformer with removable radiators. Radiators to be interchangeable from position to position with bolted flange-type connections and oil tight fittings.

Valves shall allow individual radiators to be removed while the transformer is energized and without lowering the oil level in the main transformer tank. Equip these valves with indicators to clearly show their position, open or closed. Arrange the valves so they can be bolted in either the open or closed position. Valves to be of types that do not leak around their operating stem.

B. Each radiator shall have a drain plug at its lowest point and an air inlet plug at the top. Plugs shall have a square head and standard tapered pipe threads. The fittings on the cooler assemblies will also be used to flush each entire assembly, including the piping. The bottom fitting shall be at the lowest point of the assembly.

C. A conservator application is not suitable for this installation due to space constraints.

D. Radiators shall be limited to segments 1 and 2.

E. Fan motors to be totally enclosed, non-ventilated, with sealed, pre-lubricated ball bearings, and rated for all-weather outdoor operation. Provide motors that are designed, manufactured, tested, and that operate according to the latest applicable NEMA, IEEE, and ANSI standards. Provide motors capable of operation continuously at their specified rating at the ambient temperature and altitude specified in the service conditions. Do not use service factor rating to meet this requirement. Supply one piece fan blades that are dynamically balanced. Provide galvanized steel fan guards.

2.14 NITROGEN SYSTEM

Transformer shall include nitrogen gas oil preservation system, complete with filled nitrogen tank, tank cabinet, and suitable means of connecting the nitrogen tank. This system should provide alarm contacts for low transformer tank pressure, high transformer tank pressure, and low gas bottle pressure, as a minimum. Locate the nitrogen tank compartment either segment 1 or 2. The nitrogen tank cabinet should be as low as possible on the transformer tank. Provide a pressure gauge for the nitrogen tank.

2.15 INSULATING OIL

Insulating oil to meet ANSI/ASTM D3487. Provide insulating oil that is pure mineral oil obtained from petroleum. It shall not contain moisture, acids, alkali, free sulfur, or any other substances that will affect its insulating and cooling qualities. Provide oil that will not adversely affect or be adversely affected by the insulation, the insulation varnish, or other parts of the equipment with which it will be in contact. Certify the oil delivered with this equipment, and any oil used in production or testing of this equipment, is classified as "non-PCB" (polychlorinated biphenyl) per EPA publication 40 CFR Part 761, dated May 31, 1979 (updated July 1, 1999). PCB testing to be per ANSI/ASTM D4059. THE OWNER will not accept delivery of the equipment until such certification is received. The Manufacturer will pay any demurrage incurred due to lack of this certification. The Manufacturer is also responsible to provide the same certification as listed above for any oil supplied by a subcontractor.

2.16 AUDIBLE SOUND LEVEL

Design and guarantee the transformer to have an average sound level not exceeding the levels listed in the latest revision of NEMA TR-1.

2.17 TESTING

A. Test this transformer according to the standard test procedures as outlined in

NEMA Publication TR-1, ANSI Standard C57.12.90, and IEEE 262B. Perform routine tests for a Class II (shown in ANSI Standard C57.12.00) transformer.

These tests shall, as a minimum, include resistance; ratio, polarity, and phase relation; impedance voltage and load loss; low frequency impulse; and lightning impulse.

B. THE OWNER may witness the tests at their option. Manufacturer shall notify THE OWNER, in writing, twenty-one (21) working days before testing. Notify THE OWNER of any damage occurring during the construction of the transformer. Also, notify THE OWNER of any tests that do not meet the values or standards specified.

The manufacturer shall allow THE OWNER to review any damage or failures.

C. Provide certification that the loss testing equipment is calibrated at least annually using techniques described by National Bureau of Standards Technical Note 1204.

Provide information on the testing equipment and methods used to determine the losses and their expected error with bidding documents.

D. Perform the no-load loss test with the test voltage of one hundred percent of rated voltage and the no load tap changer in its neutral position. Perform or correct testing data for this test at or to 20°C.

E. Perform the load loss test by applying a short circuit across either the high voltage windings or the low voltage windings and applying sufficient voltage across the other windings to cause the rated current to flow in the windings. The test is to be performed with the no load tap changer in its neutral position and the rated current at 80 and 100 percent of the ONAN rating and 100 percent of ONAN/ONAF/ONAF rating. Correct the results of these tests for 75°C (55° rise over 20°C ambient) operation according to ANSI standards.

F. Perform transformer oil dielectric testing per ANSI/ASTM D1816 to 30 kV.

G. Perform Sweep Frequency Response Assessment (SFRA) testing and provide test data for comparison to field testing.

PART 3 EXECUTION

3.1 FIELD SUPPORT

A. Field support is required. The offloading, dress-out and testing of the unit will be included in the bid pricing supplied by the bidder. They will be provided with the intention of furnishing and dressing the unit such that it is ready for energization and that all warranty related details are satisfied.

B. The transformer shall be offloaded by the manufacturer at the site stipulated by the Owner and inspected for any transport related damages.

C. The Owner will coordinate AC power for control cabinet anti-condensation heaters, etc. as may be required by the manufacturer for warranty purposes.

3.2 FIELD ASSEMBLY, VACUUM FILL AND PREPARATION FOR ENERGIZATION

A. Assuming the transformer can be shipped oil filled, provide make-up oil for the transformer tank in totes along with the various accessories. This oil will be used when topping off the unit.

B. Per requirements of the Owner, field testing and dress out are to be included in the proposal and listed out as noted.

END OF SECTION

APPENDIX 1

115 kV – 7.62/13.2 kV 15/20/25 MVA w/ LTC

TRANSFORMER BID DATA SECTION

MANUFACTURER OF TRANSFORMER: ___________________________________________

In addition to other data and descriptive material furnished, the Manufacturer shall fill in all spaces of the following Data Section. The specifically listed items are in no way intended to limit the data submitted, and the Manufacturer is invited to submit all material believed necessary to provide a complete description of the transformer in accordance with the requirements of the Owner.

1.0 COST DATA (PER TRANSFORMER)

a. Cost of transformer, oil, accessories and transport f.o.b. transformer foundation, COG New Substation, Gallup, NM.

b. Cost of all required factory tests (if not included) ___________________

c. Price adder for a 5 yr. warranty (if not included) ___________________

d. Price adder for sound level test. ___________________

2.0 DATES

Estimated Shipping Date Transformer _________________

Estimated Arrival Date Transformer _________________

3.0 RECEIVING AND INSTALLATION DATA

Will unit be shipped oil filled?

Are Make-up totes of oil included? Number? Oil Quantity

3.1 Weights (Pounds)

Transformer Shipping: _________lbs.

Installed: _________lbs.

With oil, installed: _________lbs.

Core and coil assembly, net: _________lbs.

Tank and fittings, net: _________lbs.

Heaviest shipping assembly, as shipped _________lbs.

3.2 Oil, gallons (Fully installed)

Main Tank: ________gals LTC Tank: ________gals

3.3 Largest shipping section (Inches)

Overall height: _________in.

Overall length: _________in.

Overall width: _________in.

3.4 Transformer installed dimensions (Inches)

Overall height: _________in.

Overall length: _________in.

Overall width: _________in.

Minimum untanking height, base to crane hook: _________in.

3.5 Tank only dimensions (Inches)

Overall height: _________in.

Overall length: _________in.

Overall width: _________in.

3.6 Maximum AC power requirements (Amps): ______Amps

3.7 Maximum DC power requirements (Amps): ______Amps

3.10 Size of control compartment and location (HxWxD): __________in.

3.11 Provide scale outline drawing(s) of transformer including height and location of control compartment, DETC handle, radiators, fans, bushings, pumps, and other accessories.

3.12 Describe parts removed for shipment and hours required to install.

4.0 RATING AND PERFORMANCE DATA

4.1 Maximum permissible continuous transformer demand at rated voltage and at rated ambient temperature without exceeding standard hottest-spot or top oil temperature for the following conditions:

55°C 65°C Rise Rise At self-cooled rating (ONAN), MVA ______ _____ At forced-cooled rating (ONAN/ONAF), MVA ______ _____ At forced-cooled rating (ONAN/ONAF/ONAF), MVA ______ _____

4.2 Positive Impedance, percent (H-X %) 115 kV high side

Quoted __________% Base MVA ________MVA Tolerance, percent __________%

4.3 Regulation at 100 percent, 55°C rise, ONAN load (percent) 100 percent power factor __________% 90 percent power factor __________% 80 percent power factor __________%

4.4 Exciting current (percent)

95 percent voltage __________% 100 percent voltage __________% 105 percent voltage __________% 110 percent voltage __________%

4.5 Efficiency at ONAN rating and 55°C winding temperature (percent) 100 percent load 55°C temperature rise rating __________% 75 percent load __________% 50 percent load __________% 25 percent load __________%

The following items marked with an * will be used for transformer bid evaluation. If not filled out, THE OWNER will reject the bid.

4.6 Guaranteed maximum losses at specified temperatures in kW.

No-load losses at 20°C (kW) 110 percent voltage at neutral NLTC _________kW 105 percent voltage at neutral NLTC _________kW 100 percent voltage at neutral NLTC *_________kW

4.7 Load Losses at specified temperature and taps in kW.

Load losses at 55°C rise over 20°C ambient, assuming sufficient voltage is applied to cause 100 percent of the rated current to flow in the windings with the other windings shorted and the NLTC on neutral tap.

80 percent of ONAN rating ____________kW 100 percent of ONAN rating *____________kW 100 percent of ONAN/ONAF ____________kW

4.8 Cooling equipment demand (kW)

At no-load ___________kW At ONAN ___________kW At ONAN/ONAF *___________kW

4.9 Total losses at 55°C rise (over 20°C ambient) in kW.

Load Loss @ 80% of ONAN Rating + No-Load Loss @ 100% Voltage = __________kW Load Loss @ 100% of ONAN Rating + No-Load Loss @ 100% Voltage = *__________kW

Load Loss @ 100% of ONAN/ONAF/ONAF + No-Load Loss @ 110% Voltage = __________kW

4.10 Audible sound levels in dB.

At No Load ____________dB At ONAN (no auxiliaries) ____________dB At ONAN/ONAF/ONAF (with first & second stage cooling) ____________dB

4.11 Induced voltage test.

One-hour test voltage level ____________kV Enhanced test voltage level ____________kV Maximum expected RIV level ____________µV Maximum expected partial discharge level ____________pC

4.12 Provide information and traceability concerning the testing equipment and methods used to determine the losses and the expected error.

5.0 NITROGEN GAS OIL PRESERVATION SYSTEM

Type __________________________________________________________________ Manufacturer ____________________________________________________________ Location of Nitrogen Tank _________________________________________________ Height of Nitrogen Tank base above transformer base (inches) _________in

6.0 ARRESTERS

High Voltage: Type _____________________________________________________

Manufacturer ________________________________________________

MCOV RATING _____________________________________________

Low Voltage: Type _____________________________________________________

Manufacturer ________________________________________________

MCOV RATING _____________________________________________

7.0 CONTACTS

For Technical Questions:

Name of Person to contact ______________________________________

Telephone Number of that person ______________________________________

Address ______________________________________

For Sales Questions:

Name of Person to contact ________________________________________

Telephone Number of that person ________________________________________

Address ________________________________________

APPENDIX 2

115 kV – 7.62/13.2 kV 15/20/25 MVA w/ LTC

TRANSFORMER HISTORY / USERS LIST

Please offer a listing of similar units provided over the past five (5) years including owners and contact information for a reference that can be contacted to discuss their experience with the transformer vendor.

APPENDIX 3

115 kV – 7.62/13.2 kV 15/20/25 MVA w/ LTC

EXCEPTIONS TO TERMS, CONDITIONS, AND SPECIFICATIONS

List any exceptions to the proposal here or point toward a list of exceptions in your proposal.