17_Attachment__1_KV4A_Transformer_Specifications.docx

WESTERN TRANSFORMER SPECIFICATIONS

Table of Contents

SOLICITATION DE-SOL-0011580 Page 3 of 30

ATTACHMENT 1 WESTERN TRANSFORMER SPECIFICATIONS

ATTACHMENT A, PART 1 - WESTERN GENERAL TRANSFORMER SPECIFICATIONS

1.1 GENERAL

The Contractor shall furnish the transformer complete with tank-mounted surge arresters, insulating oil, features, accessories as specified and any additional material necessary for the operation of the transformer.

Unless otherwise specified in this document, the transformer shall be designed and manufactured in accordance with the applicable standards including American National Standards Institute (ANSI), Institute of Electrical and Electronics Engineers, Inc. (IEEE), be in accordance with ANSI/IEEE C57 Series Standards, National Electrical Manufacturers Association (NEMA), American Society for Testing and Material (ASTM), and specifically ANSI/IEEE C57.12.00. Only new equipment of current and present day manufacture shall be furnished.

The transformer, including bushings and all accessories, shall operate within all loading and temperature rise limitations of the Guide for Loading Oil-Immersed Power Transformers with 65C Average Winding Rise in accordance with ANSI/IEEE C57.91 as applicable. Transformer minimum clearances from live parts shall be in accordance with Table 124-1 of ANSI/IEEE C2. In the event of conflicting requirements between ANSI/IEEE standards and these requirements, the terms of these requirements shall apply. Transformers shall have the full MVA rating at the specified substation elevation. The Contractor’s erecting engineer shall make all the arrangements to send empty nitrogen bottles and any other items that need to be returned to the required return location. Bolts, nuts, washers, and locknuts outside the transformer tank shall be galvanized or stainless steel.

The Contractor shall furnish and install fall prevention equipment on 34.5-kV and above transformers (for use during installation, commissioning and maintenance) as follows:

1. FALL PROTECTION: A fixed guard rail system shall be permanently installed on the transformer. The guard rail system shall have a gate that is easily accessible from a ladder placed under the opening of the gate. The ladder shall be considered as part of the guard rail system. The guard rail and the posts shall be constructed of a rigid material which can withstand a force of at least 890 N applied in any direction at the mid-span of the top rail, ropes or chains are not allowed. The top surface of the guard rail shall be at least 42 inches high. If the guard rail is not of a solid design, a grillwork design or a slatted design, then the guard rail shall consist of a mid-rail and a top rail. The mid-rail shall be located at approximately half the height of the top rail.

2. Non-skid paint shall be applied to the top of the transformer tank cover. Non-skid paint shall not be applied to tank access covers, bolts, nuts, and other removable hardware.

3. The transformer manufacturer shall limit obstacles on the top of the transformer to bushings and fall protection arrest posts.

1.2 TAP CHANGERS

1. EXTERNALLY OPERATED FIXED TAPS: The transformer shall be furnished with an externally-operated manual tap changer in accordance with IEEE C57.131 and with the following requirements. The tap changer is to be operated only when the transformer is de-energized. The tap changer shall be designed for convenient operation by a person standing on the same level as the transformer base. It shall include an operating lever or hand wheel, tap position indicator, and a means for locking the tap changer in any tap position. The locking device shall be arranged to prevent locking the tap changer in an off-tap position and shall be suitable for use with a standard-size padlock.

1.3 SURGE ARRESTERS

The surge arresters shall meet all applicable requirements of ANSI/IEEE C62.11, shall be porcelain and shall meet the following specifications:

1. They shall be mounted on the transformer tank with the base at least 8.5 feet above the transformer base except as otherwise required.

1. Each station-type arrester unit shall be provided with a pressure-relief diaphragm to prevent explosive shattering of the porcelain housing. Color of the arrester shall be gray. One surge arrester is to be supplied for each external winding terminal on each transformer, for all voltages that are required to be furnished on the equipment.

2. The surge arresters shall have sufficient mechanical strength to withstand, without damage, the mechanical forces that will be imposed on the equipment and meet the same seismic requirements as stated for the transformer that the surge arresters are mounted on.

3. The surge arresters shall be tank mounted for maximum protection of the equipment. Surge arresters for this transformer shall provide protective margins equal to or better than those listed in Attachment A, Part 2, paragraph 2.4, Table C.

4. For voltage ratings of 34.5-kV and below, the surge arresters shall be installed so that the top of the arrester is a distance of 15 inches lower or higher than the top of its associated bushing (if bushings and arresters are mounted horizontally).

1.4 BUSHINGS

The bushings shall be of a porcelain type and shall be manufactured by PCORE, ABB, or equal, such that the BIL rating is guaranteed up to 10,000 feet, the seismic qualification is guaranteed as high seismic and the current rating of the bottom connection to the transformer winding can meet the requirement of 130% of the current rating of the applicable winding. The bushings shall conform to IEEE C57.19.00 and C57.19.01 including the testing requirements. The bushings shall be located on the transformer in accordance with Attachment A, Part 2, paragraph 2.2 and the bottom of each bushing shall be a minimum of 8.5 feet above the base of the transformer.

All porcelain used in bushings shall be wet process, homogeneous, and free from cavities or other flaws. The glazing shall be gray, uniform in color, and free from blisters, burns, and other defects. Each high-voltage bushing shall have a capacitance tap for use with a bushing potential device having a burden as shown in Table 3-4 of NEMA Publication No. SG 4. Porcelain parts of each bushing rated below 450-kV BIL shall be of one piece. Porcelain parts of each bushing rated 450-kV BIL and above may be constructed of one piece or of multiple parts provided the multiple parts are assembled by one of the following methods:

5. By flanged segments;

6. By placing suitable firing material in the joints between the segments and the entire porcelain part fired in one piece;

7. By securely holding the parts together with a clamping device through the centerline of the bushing. The joint must be at right angles to the longitudinal centerline of the bushing if this method is used;

8. By cementing or bonding the joints. If the Contractor proposes to use this method, the Contractor shall submit for approval a complete description of the process and material used; bending test and electric test results on a completed joint; and results of aging tests on the joint showing mechanical strength and electrical strength.

1.5 TERMINAL CONNECTORS

1. Terminal connectors shall be furnished on each bushing and surge arrester as follows:

a. All high voltage (230-kV, 115-kV, & 13.8-kV) bushings on top of the transformer tank shall be furnished with studs for connection to the isolating test terminals being provided for bushing power factor testing. The neutral bushing and all surge arresters shall be furnished with NEMA Standard CC1, 4-hole type terminal pads.

b. Isolating test terminals used for bushing power factor testing shall be made with aluminum, and shall be “PCORE Electric”, or equal, such that the bushings can be connected to the power factor testing equipment without having to be disconnected from the bus. These test terminals shall be furnished for each 230-kV, 115-kV, and 13.8-kV bushing, and are to be installed onto the bushings during transformer installation. The test terminal connections to the bushings are to be made to the bushing stud terminals and the external connections to the test terminals are to be made using NEMA 4-hole pad terminals. The test terminals must not affect the seismic rating of the bushings. The current ratings of the test terminals and their terminal connectors shall match or exceed the current ratings of the associated bushings.

1.6 CURRENT TRANSFORMERS

Current transformers shall be in accordance with ANSI/IEEE C57.13. All secondary leads shall be brought to short-circuiting-type terminal blocks. All current transformers specified are in addition to those which may be required for operation of temperature relays. For bushing-type current transformers, the turns between any two taps on the secondary winding shall be uniformly distributed along the entire core.

The transformer shall be furnished with multi-ratio bushing current transformers as shown below in Attachment A, Part 2, paragraph 2.4, Tables D and E.

1.7 WINDINGS

Winding conductors shall be copper, shall be free from scale, burrs, and splinters, and shall be insulated with paper. Permanent current-carrying joints or splices shall be mitered and welded or brazed, properly formed, finished, and insulated, except that compression-type fittings may be used outside of the core winding.

The transformer core and coil assemblies shall be power class, round core/circular coil design and construction. High voltage and low voltage windings for the main core/coil assembly shall be either disk or helical construction; layer/barrel windings are not acceptable. All windings shall be either rectangular magnet wire or continuous transposed cable. Transformer board shall be manufactured using unbleached kraft pulp for the insulation components used in transformers including insulation boards and various insulation components. Insulation on winding conductors used in the coil process shall be cellulose insulating paper. It shall be wound onto the conductor employing a spinning process. The paper insulation shall be applied in single or multiple strands such that a minimum of 30% of the paper surfaces are overlapped to provide for a continuous insulating surface. Sufficient tension shall be maintained on the paper strands so as to prevent loose wraps. If clamping rings are utilized in the transformers design, full circumference rings shall be used. Core and coils shall be dried using a vapor phase system prior to oil filling.

Transformer shall utilize conductor and lead insulation of specially treated paper to maintain the required tensile, bending, and bursting strengths; to increase the thermal stability of the insulation; and to insure normal life expectancy.

The completed winding assembly shall be securely held in place so that there will be no disarrangement or deformation by stresses caused by shipping.

1.8 CORE

The contractor shall provide nuts, bolts, and clamps of the core assembly with positive locking devices to prevent loosening by vibration or change of shape or position during transportation or operation. The core shall be securely grounded to the tank. An external core ground, via an external core bushing, shall be provided to allow testing the core ground without exposing the internal parts to possible contamination. The core ground shall be connected to the tank with a detachable connector and the assembly shall be enclosed with a removable cover. The manufacturer shall demagnetize the core just prior to shipping transformer(s).

1.9 OIL PRESERVATION EQUIPMENT

The oil preservation system provided shall operate under the pressure limitations outlined under paragraph 1.10 (Tank) without loss of inert nitrogen gas or dry air over the entire temperature range specified. The use of auxiliary apparatus to compress or chill the gas will not be permitted.

Sufficient nitrogen gas, if required, shall be furnished for the initial flushing, filling, and operation of the transformer. The Contractor’s erecting engineer shall return these cylinders to the required return location as soon as the nitrogen bottles are empty and no longer needed for installation.

Transformer(s) shall be equipped with one of the following systems of oil preservation as defined in ANSI/IEEE C57.12.80:

1. CONSERVATOR: For the constant pressure system installed on the transformer, separation of oil from the atmosphere shall be accomplished by means of a nitrile air cell bladder confined to an auxiliary tank. The auxiliary tank shall be of sufficient volume to operate over the entire ambient temperature range specified in the solicitations. The air cell shall vent air to the atmosphere by means of a weather tight breather through a desiccant such as silica gel. The desiccant container shall be at the transformer tank potential and located (approximately 6 feet above base) so it can be replaced, refilled, and maintained while the transformer is energized. If a cell is damaged, the unit shall fail safe, by acting as a conservator. A sinking cell shall activate an alarm. Transformer(s) shall have means of isolating the auxiliary tank during installation and inspections. The auxiliary tank shall be equipped with a sump chamber and drain valve. The auxiliary tank shall be designed for full vacuum filling. A pressure-vacuum bleeder shall protect the system in the event of incorrect overfilling or under-filling during installation.

1.10 TANK

The shell, cover, and bottom of each tank, including auxiliary tanks, shall be of welded steel plate construction with all seams welded so as to remain oil-tight and gastight. During welding of the transformer cover, an inorganic gasket shall be permanently located between the cover and the tank flange to prevent weld spatter from entering the tank. Flanged horizontal joints which must be broken to untank the core and coil shall be designed for breaking and remaking in the field. The tanks, except auxiliary tanks vented to the atmosphere, shall be capable of withstanding, without leakage or permanent distortion, an internal pressure of 15-pounds-per-square-inch gauge and of withstanding a vacuum which produces a differential pressure of 15 pounds per square inch across the tank wall. Auxiliary tanks shall be capable of withstanding a differential pressure of 15 pounds per square inch. All flanged joints shall be provided with gaskets set in grooves or held in position by stops to prevent over compression of the gaskets. The gaskets shall be of resilient material which will not deteriorate under the action of hot oil and will remain oil-tight. Unless otherwise approved by the government, all piping connections shall be made with flanged joints. Flanges shall be welded to pipe sections and bolted together with gaskets impervious to oil and able to withstand high temperatures without damage. All valves shall be mounted to the tank with flanged connections.

Stiffeners required for the tank shall be selected and arranged in order to minimize the collection of dirt particles, rain, or snow.

Lugs and jacking pads shall be provided for moving and lifting the transformer either by crane or by jacks. Jacking pads shall be suitable for jacking the complete transformer filled with oil. The jacking pad dimensions shall be shown on the transformer outline drawing.

A manhole of sufficient size to permit the removal of the bushing current transformers shall be installed in the tank cover.

The construction of the main tank, auxiliary tanks, and the oil-preservation apparatus shall be such as to insure an adequate cushion of gas in applicable parts of the apparatus for the following conditions:

1. INTERNAL GAS PRESSURE: For any of the systems of oil preservation, except the sealed tank system, the internal gas pressure shall be not less than 0 pounds per square inch nor more than 5 pounds per square inch, with transformer temperature changes attained between de-energized condition and up to 110 percent maximum rated load condition with an ambient air temperature range as shown in Attachment A, Part 2, paragraph 2.1 of these specifications. For the sealed tank system, the internal gas pressure limits may be increased to those values given in ANSI C57.12.10, paragraph 5.7.

2. LOSS OF GAS OR OIL: If a constant pressure system is furnished, the system shall operate without the loss of oil and without the loss of the seal between the transformer interior and the atmosphere over the entire temperature range specified from minus 20 degrees C to plus 55 degrees C and the entire range of operating conditions. The main transformer tank shall be constructed to withstand the range from full vacuum to the maximum oil pressure that will be exerted during oil filling, oil processing, and vacuum processing to remove moisture and to withstand all operating conditions from de-energized up to 110 percent of maximum rated load.

1.11 BASE

The transformer manufacturer shall install a fabricated structural-steel base on the bottom of the transformer tank which shall include pulling eyes used to pull the transformer into place. The base shall be designed and built so as to allow skidding or moving on rollers in either direction. Flat plate bases without internal or external reinforcing structural members are not acceptable.

Transformer bases shall be designed to permit anchoring to the concrete foundation by means of welding to embedded steel members installed in the foundation by the Government. The Contractor shall show, on an informational outline drawing, the location, size, type, and lengths of anchor plates and weld patterns, including foundation loads for each anchorage assembly and the foundation overturning moment, so that the Government can complete its foundation design in advance of shipment. These information drawings shall be provided per Attachment A, Part 1, paragraph 1.22, Table A.

1.12 COOLING EQUIPMENT

The power supply for cooling equipment will be Government furnished at nominal 240/120 volts, single-phase. One feeder circuit will be provided by the government to the transformer control cabinet for all auxiliary power needs (see control cabinet specification section for more detail). Transformer shall be designed with radiators or cooling units to ensure operation at the ratings and temperature rise as shown in Attachment A, Part 2, paragraph 2.1. The radiators or cooling units shall be constructed to withstand full vacuum to the maximum oil pressure that is experienced during oil filling procedures and worst case operating conditions.

Cooling units shall be connected to the tank by bolted, machined steel flanges, with the flanges welded to the cooling units and to the tank. Flanges shall be provided with gaskets and valves and shall be installed on each cooling unit connection, so that any individual cooling unit may be removed without taking the transformer out of service. An oil-tight, blank flange shall be provided for each connection, for use when cooling units are detached. Each cooling unit shall have a lifting eye, an oil drain, and a vent. If the cooler units furnished are of the finned-tube type, the tubes, fins, and tube sheets shall be designed to permit replacement of individual cooler tube groups. The finned tube assembly tubes and fins shall be unpainted and shall be galvanized steel.

Transformer(s) shall be capable of operating with the conditions outlined in ANSI/IEEE C57.91, paragraph 9.8. Sufficient cooling equipment shall be provided to operate the transformer at full rated capacity without exceeding the guaranteed temperature rise. Forced air cooling shall be accomplished by the use of fans.

1. FANS: Fan motors shall be of the totally enclosed design.

The connections to the supply circuits shall be made by means of watertight plugs and receptacles provided the interconnecting cables are mechanically protected by use of ducts or flexible conduits. Flexible conduit and cable shall be sunlight resistant and not require replacement for at least 30 years.

2. CONTROL EQUIPMENT FOR FANS: The control equipment shall include a circuit breaker for the incoming circuit, a circuit breaker for each stage group of fans, contactors with overload protection in each phase, MANUAL-OFF-AUTOMATIC control switches for each fan group, STAGE 1-STAGE 2 selector switches for fan groups, and any other necessary devices.

The Contractor shall furnish all control transformers, fuses, circuit breakers, indicating lamps, terminal blocks, magnetic-type starters, fused or un-fused disconnect switches, test pushbuttons or switches, and auxiliary and timing relays for the control, protection, annunciations, and remote indication of the fans. All fuses and circuit breakers shall be capable of accepting lock out tag out (LOTO) locks.

Fuse cartridges and their clips shall be mounted inside the cover of the fuse enclosure, and shall be disconnected from the circuit when the cover is removed for fuse replacement.

1.13 ACCESSORIES/OPTIONS

The contacts of all relays, gauges, control devices, and thermometers shall be insulated from ground and shall be of a positive, snap-action type. Mercury-type relays and contacts are not acceptable. All relays and contactors shall be provided with covers. Contacts should close for abnormal conditions and shall be wired to terminal blocks for external cabling to control room building. Each of these contacts shall be rated for 125 V dc.

All gauges and meters shall be calibrated in United States Standard designation; i.e., pounds per square inch, etc. All nameplates and designation labels shall be in the English language.

Transformer(s) shall be equipped with the following listed accessories (Items 1 – 25):

1. RESISTANCE TEMPERATURE DETECTOR(S) (RTD’s): Resistance temperature detectors shall be provided to measure top oil temperature in the main tank and ambient temperature. RTD’s shall be 3 or 4 wire 100 ohm platinum Class A sensors and shall be wired as inputs to transformer monitoring system specified elsewhere. The RTDs shall be installed in their own thermowell.

2. SUDDEN PRESSURE RELAY: The contractor shall provide a separate sudden pressure relay complete with seal-in relay and control switch for each transformer. The relay shall be mounted to the transformer with a full-flow ball valve. The relays shall be actuated by sudden pressure rise inside the main tank and shall not operate on gradual pressure change within the normal operating range of the transformer, however, the device shall quickly alarm or trip during rapid pressure rise changes. The device must be able to withstand up to 20 PSI positive pressure without damage and operate over a temperature range from -40 to 180 degrees F.

The sudden pressure relays, auxiliary relays, and control switches shall be mounted in such a way that mechanical vibration, such as that due to a close-in fault, will not cause false operation of the relay scheme.

The relaying scheme shall provide two normally open, electrically separate contacts, one for tripping and one for alarm. A control switch shall be mounted in the terminal cabinet on the transformer and shall be wired in series with the tripping contact of the seal-in relay to cut out the tripping function of the sudden pressure relay during maintenance. This switch shall be an Electroswitch series 24.

3. PRESSURE-RELIEF DEVICE ON THE MAIN TANK (AND ON THE TAP-CHANGING COMPARTMENT CONTAINING OIL): The device shall be self-resetting, without the use of expendable parts. The device shall have directed oil flow. The device, and all parts thereof, shall have a service life comparable to that of the transformer of which it is a part and shall be weather resistant. Semaphore and alarm contacts shall be provided on the device to give visual and electrical indication of operation and two switching contacts shall be located within the hood. The micro-switches shall be fully adjustable. The device shall open within 2ms and close within 70 ms and have a pressure range of 6 to 30 psi. There shall be no leakage and the signals shall be reliable with low noise. The pressure relief device shall be in the Messko MPreC series (or equal) and sized for the transformer.

4. OIL INLET VALVE: The oil inlet valve shall be 2 inches and separated from the vacuum valve; and shall be mounted parallel to the ground to facilitate the connecting of the oil line.

5. OIL OUTLET VALVE: The oil outlet valve shall be 2 inches and separated from the vacuum valve; and shall be mounted parallel to the ground to facilitate the connecting of the oil line.

6. LIQUID THERMOMETER: The dial-type liquid thermometer gauge/relay (26 Q) shall have adjustable alarm and trip contacts set at 80°C and 85°C, respectively, for 65°C temperature rise, or as recommended by the transformer manufacturer. The liquid thermometer shall provide a 0-1 mA analog output for use with a SCADA system. The viewing portal shall be made of safety glass and be resistant to damage from prolonged exposure to the sun. The device shall be reliable through any weather conditions and when subject to vibrations as well as providing automatic compensation of ambient temperature. No readjustment or recalibration is required over the lifetime of the device. The type of device meeting these requirements include a Qualitrol Series 104-400, a Messko TRASY2, or equal. The liquid thermometer (26Q) shall be located in its own well.

7. OIL LEVEL GAUGE: This device shall have one low-level contact for alarm and one additional lower-level (critical level) contact for tripping.

8. OIL DRAIN VALVE: Provide a globe valve with an oil sampling device.

9. UPPER AND LOWER FILTER-PRESS CONNECTIONS:

10. DIAGRAMMATIC NAMEPLATE: Nameplate information shall be etched, stamped, or engraved into the metal of the nameplate and this nameplate shall be sun and fade resistant. The nameplate is to include all the information as required by ANSI/IEEE C57.12.00, Table 9.

11. PRESSURE-VACUUM GAUGE: Shall be mounted in location easily visible and large enough to be used by operator on the ground

12. GROUNDING PADS AND CABLE: Two grounding pads (per ANSI standards) on and near the base of each transformer tank and terminal connectors suitable for 4/0 AWG through 500 kcmil copper cable for each pad, shall be provided. In addition, one grounding pad and terminal connector shall be mounted on the transformer tank near the base of each set of arresters and the neutral bushing. The Contractor shall provide bare copper cable, neatly supported, from each of the two grounding pads at the base of the transformer tank up to the arresters and neutral bushing pads interconnected at the top of the tank. The minimum size of copper cable to be furnished for the transformers is 500 kcmil copper cable.

13. VACUUM CONNECTION: The vacuum valve shall be 4 inches, be separate from the oil fill valve and be mounted parallel to the ground on or near the top for ease of connecting the vacuum line. A 1 inch valve shall be installed on top of the transformer to connect a remote vacuum sensor to be used during the oil filling process.

14. OIL PIPE CONNECTION BETWEEN MAIN TANK AND OIL EXPANSION TANK WITH A SHUTOFF VALVE AND A BUCHHOLZ RELAY: The BUCHHOLZ relay shall have an alarm contact responsive to low levels of gas accumulation and a tripping contact responsive to both sudden oil flow and excessive gas accumulation. The tripping contact shall be wired to a Qualitrol Model 909-300-01 or equal seal-in relay. The seal-in relaying scheme shall provide two normally open, electrically separate contacts, one for tripping and one for alarm. A control switch shall be mounted in the terminal cabinet on the transformer and shall be wired in series with the tripping contact of the seal-in relay to cut out the tripping function of the Buchholz relay during maintenance. This switch shall be an Electroswitch series 24. Full-flow ball valves shall be installed in the piping on each side of the Buchholz relay to facilitate testing, inspection, and replacement of the relay.

15. WEATHERTIGHT BREATHER: The breather shall be maintenance free with a sensor controlled self-regulating heating element located in the silica gel chamber which dehydrates the silica gel when the moisture content of the air in the chamber has reached a specified value. The water vapor removed from the silica gel shall condense on a bottom element and drip out of a stainless steel filter. Malfunctions of the sensor or the heating system shall be indicated on a continually powered contact. The breather shall have a red (device error), yellow (regeneration) and green (power on) LED light used for status indication. The breather shall be in the Messko MTraB series (or equal) operating at 120 VAC and sized correctly for the transformer specified herein.

16. SUMP CHAMBER AND DRAIN VALVE IN RESERVOIR TANK:

17. GAS DETECTOR RELAY WITH ALARM CONTACTS: (Required only on transformers rated 345-kV and above).

18. ELECTRONIC CONDENSIVE BUSHING POWER FACTOR AND CAPACITIVE ANALYZER AND TRANSFORMER MONITOR: The Camlin Power TOTUS shall be used for monitoring the transformer HV, LV, and TV bushings, transformer top oil and bottom oil temperatures, through fault current, partial discharge, and dissolved gas analysis (DGA) of the transformer insulation oil. The transformer manufacturer shall install the monitor on the transformer tank and in compliance with the manufacturer’s specifications and recommendations as it applies to this transformer.

Any auxiliary equipment necessary for the proper installation, operation and remote communication to the monitoring equipment is the transformer manufacturer’s responsibility (sensors, leads, aux relays, oil lines, fiber patch cables, etc). The monitor shall be capable of DNP 3.0 communication using fiber optic cable and function as a data concentrator. The contractor shall provide software to setup, interrogate, retrieve and view data.

The transformer manufacturer shall apply settings to all electronic devices according to the monitor manufacturer’s recommendations as applicable to this transformer.

On-site training for maintenance personnel shall be provided when the monitor is commissioned by the factory representative. One complete set of programming/monitoring software shall be provided to Western.

19. WINDING TEMPERATURE MONITOR: Contractor shall use a LumaSense Luxtron ThermAsset2 (model number: 00-14740-28) with Luxtron DipTip Rugged Probes. The 8 fiber optic probes shall be embedded and installed at each winding hot spot per transformer manufacturer’s recommendations. The monitor shall also be connected to a separate dc supply circuit protected by a circuit breaker. The analog outputs shall be wired into the SEL 2414 analog inputs mentioned below. The transformer manufacturer shall install the monitor in compliance with the monitor manufacturer’s specifications and recommendations as it applies to this transformer.

Contractor shall use a Schweitzer Engineering Laboratories (SEL) 2414 transformer monitor (model number: SEL 241421A1A915X851000) to monitor the top oil, winding temperatures, and through faults of the transformer. The RTD’s for the top oil temperature and ambient temperature shall be wired into the SEL 2414. A set of 3 phase currents from the hot spot (H, X, and Y voltage) bushing CT’s shall be wired into the SEL 2414 to monitor winding temperature and through fault currents. The SEL 2414 shall be programmed for cooling stages, alarm, and trip points respectively for a transformer designed for a 65C temperature rise. The monitor shall be connected to a separate dc supply circuit protected by a circuit breaker. The installation and programming of the SEL 2414 shall be done in accordance with the SEL 2414 instruction book. The contractor shall also mount a States brand test switch (part number: FMS-10A1) below the SEL 2414. The test switch will be wired by Western in the future.

21. FIBER-OPTIC TERMINATION AND INTERCONNECTION CENTER: Corning WIC-012-15 Fiber Wall-mount Interconnection Center with multimode ST inserts shall be mounted in the same control cabinet where the monitoring equipment is located. Fiber entryways shall be kept clear of terminal blocks, auxiliary relays, wire bundles, etc.

22. CIRCULAR, BOLTED MANHOLE COVERS: Provide a minimum of two circular bolted manhole covers located on the transformer tank such that they are accessible without the removal of any other equipment. Manholes shall be constructed with flush handles to reduce tripping hazard when working on the transformer cover.

23. LIFTING LUGS FOR LIFTING THE COMPLETE OIL FILLED TRANSFORMER

24. LIFTING EYES FOR LIFTING THE TANK COVER ONLY

25. FACILITIES FOR LIFTING CORE AND COIL ASSEMBLY INTO AND OUT OF THE MAIN TANK

1.14 CONTROL CABINETS AND TERMINAL BOXES

The Contractor shall furnish and install one control cabinet for the transformer. The contractor shall furnish and install terminal boxes as required for current transformer wiring near each bushing to complete the CT wiring from the terminal boxes to the control cabinet.

All leads connecting current transformers and accessories to the transformer control cabinet shall be furnished, installed in conduit, and terminated in the control cabinet by the Contractor.

All termination of current transformers leads shall be on conveniently located (without obstructions), short-circuiting type terminal blocks. Note that the terminal blocks for A, B, and C phases of each current transformer set shall be grouped together as shown on drawing 31 6009. The short-circuiting type terminal blocks shall be: General Electric Company type EB27BO6S, Marathon Catalog No. 1506 SC or equal. See paragraph 1.22 for standard drawing requirements. Splices are not allowed in current transformer secondary leads.

The contractor shall provide control cabinet(s) with a hinged, gasketed cover and a gasketed removable plate in the bottom which can be drilled in the field for conduits. The removable plate shall be arranged such that it can be removed and replaced from the inside of the cabinet so that conduits can be stubbed into the cabinet with the plate removed and then the punched plate can be lowered over the conduits. External circuits will enter the bottom of the cabinet(s) through exposed, weather-tight rigid conduit. Cabinet(s) shall be NEMA Type 4.

The height, width, and depth of the cabinet, and the bottom of the cabinet to the base of the transformer dimensions, shall be shown on the outline drawing of the transformer.

1. CONTROL CABINETS: Control cabinets shall contain the following unless otherwise noted:

a. Copper grounding bar, 1 inch wide and 1/4 inch thick and long enough to terminate all ground connections, but not less than 24 inches long for control cabinets (also provided with at least 40 drilled and tapped holes equipped with 10-32 screws). The bar shall be located in a convenient position near the terminal blocks for grounding of cable shields and grounded conductors of incoming control and power cables.

b. Paragraph 1.23 lists the number of the drawing that shows the WAPA approved grounding method for cables that are provided by the manufacturer with the specified equipment. Shielded cable grounding shall be in accordance with the standard drawings which are provided as a guide.

c. Terminal blocks to terminate cabling in control cabinets.

d. Terminal blocks, in control cabinets only, for terminating the wiring from transformer accessories.

e. Short-circuiting-type terminal blocks, in control cabinets only, for terminating each tap lead from each bushing-type current transformer.

f. Heavy-duty terminal blocks for incoming auxiliary power circuit shall be sized to accommodate No. 2 AWG wire. The Government will furnish a 240/120-volt single- or three-phase auxiliary power feeder circuit. Conductors and the feeder circuit breaker will be sized in accordance with National Electrical Code requirements to accommodate the maximum auxiliary power load of the transformer which shall be shown on the informational control drawings required by Attachment A, Part 1, paragraph 1.23. The incoming terminal blocks and supply conductors to branch circuit breakers in the transformer control cabinet shall also be sized in accordance with National Electrical Code requirements

g. Auxiliary equipment for controlling the fans.

h. Control Cabinet Lighting: The contractor shall provide a light equipped with a safety shield to adequately illuminate the interior of control cabinets. An automatic pushbutton light switch actuated by opening the cabinet door shall be provided to control the light. The light shall be connected to a separately fused 120 V ac supply circuit.

i. One or more single phase heaters shall be mounted in each control cabinet to prevent condensation. The heaters shall be located so as not to damage incoming cables or other equipment. The electric power for the heater circuit shall be thermostatically controlled with provisions for disconnecting the ac power source. Heater voltages shall be 240 VAC.

j. A main breaker for the 125 V DC circuit and feeder DC breakers for each IED system shall be provided

2. RECEPTACLE OUTLET: A weatherproof, separately fused, 20-ampere, 120-volt, 2-pole, 3-wire, polarized, duplex, grounded receptacle outlet with a built-in ground-fault circuit interrupter connected to a 120 V ac supply shall be provided and mounted on the outside of each control cabinet so that it is available for use without opening the control cabinet door. The interrupter shall automatically interrupt the circuit for ground fault currents of 5 milliamperes or greater and shall interrupt dangerous ground-fault currents within 1/30 of a second. Each receptacle shall have a test button to check the operation of the interrupter and a reset button that moves to a trip-indicating position upon operation of the interrupter. Receptacles shall have NEMA standard configuration 5-20R, shall fit in a standard single-gang box, and shall be furnished with a cast-metal weatherproof cover plate having a spring-loaded lift cover with a gasket.

3. TAP LEADS: The terminal boxes near each bushing shall contain the tap leads from the bushing current transformers. The leads shall then be continued in rigid metal or flexible (Tech. 90 cable) conduit to short-circuiting-type terminal blocks located in the control cabinets.

1.15 TERMINAL BLOCKS

Terminal blocks for power wiring shall be of the heavy-duty type for insulated copper cable and shall be sized to accommodate No. 4 AWG wire.

Terminal blocks for control wiring shall be rated at least 600 V and 25 amps; shall be suitable for use with No. 10 AWG wire; shall be molded-block type to accommodate ring lugs 1/2 inch wide (outer diameter) at the terminal screws; shall be furnished with binding-head or washer-head screws having serrated or grooved contact surfaces or having lock washers; and shall be furnished with molded insulating barriers between terminals. Each terminal block shall have a removable marking strip. Terminal blocks shall be as listed below (or equal):

1. Buchanan Catalog No. B112. (or equal)

2. General Electric Company Type EB25B12. (or equal)

The arrangement and location of the blocks shall be such that incoming and outgoing cables can be supported. Adjacent rows of terminal blocks shall be separated at least 6 inches, edge-to-edge, and shall be at least 6 inches from sides, top, or bottom of cabinet for all wiring which will be made in the field. Wiring which will be done at the factory may be made in a space which is not less than 3 inches instead of the preceding 6 inch space requirement, provided that the factory wiring will not share common space with the field wiring. The contractor shall provide seven blank 12-point terminal blocks to allow for Government 12/C cables to land consecutively and wire SIS between these blocks and the blocks used for the transformer wiring.

1.16 CONTROL WIRING

Control wiring shall be performed with switchboard-type, No. 14 AWG, Class K stranded, copper conductor, rated for 600 V service, with NEC Type SIS insulation. The current transformer secondary leads shall not be less than No. 10 AWG and shall be red SIS insulation.

All terminations of wire shall be made with non-insulated lugs. Exposed wiring shall be kept to a minimum and, where used, shall be formed into compact groups bound together and firmly supported and shall be run straight, horizontally, or vertically with short radius right-angle bends. Hinge wiring shall be twisted around the longitudinal axis of the wire, wherever possible, instead of being bent laterally. Each wire shall be protected from abrasion where it leaves a channel or duct. There shall be no splices in the wiring, and all connections shall be made at device studs or terminal blocks. There shall be no more than two wires terminated at each terminal point. No. 8 AWG wiring, or smaller, shall be terminated at terminal blocks. Wiring larger than No. 8 AWG shall be connected into terminals that have a high short circuit current rating (up to 200kA), that are fully enclosed for touch-safe isolation of live parts, that are suitable for both aluminum and copper conductors, and meet the requirements of the National Electric Code. The terminal shall be a EPDB512 from AutomationDirect (or equal).

1.17 INSULATING OIL

1. GENERAL: All electrical equipment shall be designed to operate with oil which conforms to the requirements of ASTM D 3487, “Mineral Insulating Oil Used in Electrical Apparatus”, except that for oil-filled bushings the manufacturer’s standard insulating oil is acceptable. Electrical equipment with insulating liquids containing polychlorinated biphenyls (PCB) is not acceptable. Equipment (including each bushing identified by its serial number) requiring insulating oil shall be permanently marked and certification furnished to certify that there are no more than 2 parts per million PCB present when the equipment is manufactured. If the oil is shipped separately, the Contractor shall also furnish certification that the oil meets the EPA requirements or the State requirement (whichever is more stringent) for non-PCB when the oil is delivered to Western. The oil truck driver shall have in his possession and furnish this certification to Western upon arrival at the delivery site.

2. SAMPLING AND TESTING: Certified results of tests which demonstrate compliance with ASTM D 3487 and these specifications shall be furnished.

Copies of certified report of the tests shall be furnished as required by the (Drawings and Data to Be Furnished by the Contractor) paragraph.

Western will test a sample of the oil directly from the shipping container at Western’s receiving facility to demonstrate that the following requirement is met:

3. DELIVERY AND ACCEPTANCE TESTING: The oil shall be delivered to the required delivery location in accordance with solicitation requirements. Shipping containers shall be dedicated to new transformer oils.

The Contractor shall check the quality of the oil while it is still in the container(s) (tankers, drums, etc.) at Western’s receiving facility. The contractor shall complete the tests below using samples drawn directly from the container(s). Test results shall be reviewed and approved by the Contracting Officer’s Technical Representative prior to filling the transformer.

1.18 FACTORY ASSEMBLY AND TESTS

The transformer shall be completely assembled at the factory and shall be subjected to the following tests, by the Contractor, in accordance with ANSI/IEEE C57 unless otherwise indicated. Test instrument requirements shall be in accordance with the National Bureau of Standards Technical Note 1204. Prior to testing, the transformer oil shall be circulated through the transformer oil pumps and heat exchangers – if installed.

The Contractor shall furnish, as a part of the report on factory tests, sample calculations and the formulas used in determining the results of the tests. The reports furnished and submitted to the Government as proof of the impulse test withstand shall include all necessary digital data as PDF and hard copy in accordance with paragraphs 1.22. The transformer(s) shall not be shipped if any test results do not meet the results expected as described in IEEE C57.12.90 and if the test results show that the transformer does not meet the loss and temperature rise values guaranteed by the Contractor. In that case the Contractor must develop a plan to correct the deficiencies to the transformer detected by the testing and submit it to the Contracting Officer’s Technical Representative for approval before retesting the transformer.

1. IMPULSE TEST: These tests shall be performed in accordance with ANSI/IEEE C57.12.90, Part 1, paragraph 10.3, on each terminal of the transformers, including the neutral, in the presence of the Government inspector if available. Ungrounded terminals not being tested may be protected by a gap providing the gap does not flash over during the test. The Contractor may perform any other impulse tests desired after the initial reduced-wave and prior to the last two chopped-wave and the final full-wave tests.

No impulse testing shall be performed after the test is accepted. Ground current measurements in accordance with paragraph 10.3.4.1 of ANSI/IEEE C57.12.90 also shall be made and the method used for detection of insulation failure shall be the comparison of waves. Simultaneous oscillograms shall be taken of the impulse voltage applied to the tested terminal and, except for the chopped-wave tests, the voltage from a suitable shunt connected to measure neutral or ground current. The records for the reduced wave and final full wave shall have identical amplitudes to aid failure detection by superimposing digitally the oscillograms of the test waves. The minimum height of each individual trace (at maximum deflection) shall be 30 mm. The criteria for failure detection shall be in accordance with ANSI/IEEE C57.12.90, paragraph 10.3.4.

2. INSULATION POWER FACTOR TEST: Insulation power factor shall be measured in accordance with ANSI/IEEE C57.12.90, paragraph 10.10.

3. SURGE ARRESTER TESTS: All surge arresters shall have the watts-loss and the partial discharge tests performed before unit shipment and test results documented and submitted per paragraph 1.23.4.

4. APPLIED POTENTIAL TEST: Conducted at either 50 Hz for 72 seconds or 60 Hz for 60 seconds.

5. PHASE-TO-PHASE INSULATION TEST: A phase-to-phase low frequency test in accordance with ANSI/IEEE C57.12.00, Table 6 is required on 3 phase transformer rated below 115-kV.

6. NO-LOAD LOSS: No-load loss by the average-voltage voltmeter method to be made after the impulse test. Accuracies required for measuring losses shall be in accordance with ANSI/IEEE C57.12.90, paragraph 9.4.

7. EXCITING CURRENT: For transformers rated above 115-kV and above 50 MVA (OA), the Contractor shall also provide a calculated exciting curve of percent voltage versus percent exciting current for a range of 90 to 140 percent of rated voltage. Test values shall be used, when available, for the range from 90 to 110 percent of rated voltage.

8. IMPEDANCE INCLUDING LOAD LOSS: Load loss tests shall be made for the loading condition as given under clause WES-H-1046 “Warranted Characteristics” Tests may be made at 50 Hz. Impedances measured at 50 Hz shall be converted to 60 Hz values.

If the Contractor cannot provide enough power or power factor for the total transformer to be tested, the Contractor shall test high-voltage, low-voltage, and tertiary-voltage windings individually and simulate loading conditions as closely as possible to the loading condition specified and total the losses from the individual tests to obtain results equivalent to a 3 phase test of the transformer.

The certified reports of the tests performed under this paragraph and subparagraph 9 below, and of the load loss as defined in the Evaluation and Award Criteria paragraph from this solicitation, shall include the values for the loading condition given in solicitations under “Warranted Characteristics”.

9. TOTAL LOSSES: Total loss data shall be furnished for the loading condition as given under clause WES-H-1046…