Attachment_A_Specifications.pdf

Attachment A

Specifications 07-26-13

DE-SOL-0005846

i

WESTERN TRANSFORMER REQUIREMENTS AND SPECIFICATIONS

Table of Contents

ATTACHMENT A, PART 1 - WESTERN GENERAL TRANSFORMER SPECIFICATIONS

1.1 GENERAL:

1.2 TAP CHANGERS:

1.3 PHASE SHIFT INTERLOCK CONTROL:

1.4 SURGE ARRESTERS:

1.5 BUSHINGS:

1.6 TERMINAL CONNECTORS:

1.7 CURRENT TRANSFORMERS:

1.8 WINDINGS:

1.9 CORE:

1.10 OIL PRESERVATION EQUIPMENT:

1.11 TANK:

1.12 CONNECTIONS BETWEEN TANKS:

1.13 BASE:

1.14 COOLING EQUIPMENT:

1.15 ACCESSORIES/OPTIONS:

1.16 CONTROL CABINETS AND TERMINAL BOXES:

1.17 TERMINAL BLOCKS:

1.18 CONTROL WIRING:

1.20 INSULATING OIL:

1.21 FACTORY ASSEMBLY AND TESTS:

1.22 TOOLS AND APPLIANCES:

1.23 PAINTING:

1.24 SPARE PARTS:

1.25 ELECTRICAL DRAWINGS AND DATA:

1.26 REFERENCE DRAWINGS AND DATA:

ATTACHMENT A, PART 2 - OPERATING CONDITIONS AND TRANSFORMER RATINGS

2.1 OPERATING CONDITIONS: WATERFLOW SUBSTATION

2.2 PHASE SHIFTS:

2.3 TEMPERATURE RISE FOR EQUIPMENT:

2.4 VOLTAGE RATINGS, CURRENT RATINGS, BIL RATINGS AND DESIGN IMPEDANCE

345-kV terminals (source) ii

ATTACHMENT A, PART 3 – OTHER REQUIREMENTS

3.1 PLACE OF DELIVERY:

3.2 SERVICES OF ERECTING ENGINEERS AND TRIP TO JOB SITE:

3.3 TOOLS, APPLIANCES, AND SPARE PARTS:

3.4 POST AWARD FACTORY MEETING:

3.5 IMPACT RECORDER AND SWEEP FREQUENCY RESPONSE ANALYZER REPORTS

3.6 ASSEMBLING TRANSFORMER

3.7 ENVRIONMENTAL QUALITY PROTECTION

ATTACHMENT A, PART 1 - WESTERN GENERAL TRANSFORMER

SPECIFICATIONS

1.1 GENERAL:

The Contractor shall furnish two, 345-kV phase shifting transformers complete with tank-mounted surge arresters, insulating oil, features, and accessories as specified. All material necessary for the operation of the transformer shall be provided.

Unless otherwise specified in this solicitation, the transformer shall be designed and manufactured in accordance with the latest 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 and IEC/IEEE C57.135. 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 65°C Average Winding Rise in accordance with the latest ANSI/IEEE C57.91 as applicable. Transformer minimum clearances from live parts shall be in accordance with Table 124-1 of the latest ANSI/IEEE C2. In the event of contradictory 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. A removable safety lanyard attachment pole system shall be provided. The fall prevention system shall accommodate at least three workers on the top of the transformer at one time.

Three self-retracting safety line units shall be provided as part of the system. Each retractable safety line unit shall be complete with shock absorber, attachment hardware, and nonmetallic retractable safety line with minimum length of 20 feet. The system shall be designed, manufactured, and certified to comply with OSHA standards in effect on the date of contract award. A storage box located for convenient access from the top of the transformer shall be provided for storage of the fall prevention equipment when not in use.

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.

1.2 TAP CHANGERS:

1. LOAD-TAP-CHANGER: The load tap-changing equipment shall provide phase angle regulation, as required by these specifications, of the nominal 345-kV output over a range of plus or minus 40 degrees phase shift at rated output capacity with a minimum of 33 tap positions. The plus or minus 40 degrees phase shift is the maximum expected on the tap changer, the upper end can vary by up to minus 10% or 36 degrees maximum and the lower end can vary by up to positive 10% or minus 36 degrees maximum. One tap position shall be at exactly zero phase shift at no load, and the transformer shall be capable of being bypassed at this position with any load from full load to no load with the flow in any direction. The load tap-changing equipment shall be for remote and local electrical, manually actuated non-automatic control. Provisions shall be made on the transformer for manually moving the tap changer for adjustment and test. Facilities shall also be furnished for remote and local tap position indication of the transformer.

a. The design of the tap-changer mechanism shall be such that the mechanism will not stop in an intermediate position. However, if the mechanism through mis-operation does stop in an intermediate position, the design shall be such that full load can be carried by the transformer continuously without injury to any component. The moving contact assembly shall be self-aligning and, when in closed position, heavy contact pressure shall be applied.

All current-carrying parts shall be of sufficient area and cross section to ensure a temperature rise under full-load conditions not to exceed 18°C.

b. The tap-changing device shall be designed to withstand the applied potential test of the winding to which it is connected. Each tap-changer mechanism shall be motor driven and shall be mechanically capable of performing 400,000 operations, and the tap changer contacts shall be capable of performing 200,000 operations at full load without the necessity of replacing or rebuilding any of the parts.

c. Each completely assembled tap changer shall be capable of withstanding, without damage, the maximum short-circuit stresses which would be imposed upon it when the transformer itself is subjected to short-circuit currents in accordance with the requirements specified in this solicitation.

d. Those elements of the tap-changing-under-load mechanism which may cause sparking during operation shall not be placed in the transformer main tank but must be located in a separate compartment to exclude the possibility of contamination of the oil in the main tank.

Connections from the main tank to the tap-changer compartment shall be made by means of entrance bushings with compression flanges or other equally effective method of preventing interchange of oil between the transformer main tank and the tap-changer compartment.

e. Vacuum interrupters shall be used in lieu of arcing contacts such that there is no arcing in oil during normal tap changer operation.

f. Positive control of the tap changer shall be provided such that a tap-changing operation, once initiated, will be automatically completed and then stopped until the control switch is again operated to continue or reverse the operation.

g. An operation counter shall be furnished to record the number of tap changes.

h. The control switches for load-tap-changer control shall be equal to General Electric Type

SB1 or Electroswitch Series 24 switches. Control switches shall have at least one spare contact in each switch position, provided the spare contacts do not require an additional gang of switches. The switch identification shall be engraved on the escutcheon plate or, if necessary, on a separate adjacent nameplate furnished by the Contractor.

i. Terminal and control cabinets associated with the load tap changer shall be located to allow safe and convenient access from the ground while the transformer is energized.

Enclosures shall be NEMA Type 4 or equivalent.

j. The Contractor shall furnish and mount on the transformer:

1) A mechanical tap position indicator.

2) A device for manual operation with the control circuit disconnected from the power supply.

3) The transformer shall be equipped with an INCON Synchro Rotary Position Transmitter, model 1292-KS from Intelligent Controls, Incorporated to be used with an already existing INCON 1250 Remote Position Indicator.

4) The Contractor shall furnish and install control switches in the transformer control cabinet to provide the functions described below:

a) Manual electrical “raise-lower” operation from the local controls at the control cabinet and from a remote location. Simultaneous local and remote operation shall be prevented by a control switch.

b) Enabling and disabling of automatic control from the local controls at the control cabinet and from a remote location. Manual electrical “raise-lower” operation shall be allowed only when automatic control is disabled.

5) The Contractor shall furnish and install control equipment and devices to be mounted at the transformer for use with remote devices located in the control building.

a) Interlock control devices and relays for sequential energization and deenergization of the phase-shifting transformer.

b) Provisions for remote lamp indication of the zero phase shift at no load position for energization and deenergization of the phase-shifting transformer.

6) The Contractor shall furnish and install control equipment and devices to be mounted at the transformer for use with local control, indication, and instrumentation.

a) One two-position “LOCAL-REMOTE” control switch.

b) One three-position “RAISE-OFF-LOWER” spring return to the OFF position control switch for controlling phase angle.

c) One tap position indicator for each load tap changer.

d) One white LED lamp for indicating the zero phase shift at no-load position for energization and deenergization of the phase-shifting transformer.

1.3 PHASE SHIFT INTERLOCK CONTROL:

The Contractor shall furnish and install an interlock control feature which will electrically interlock the phase shifting transformer with the government furnished interrupter disconnect switches used in the transformer energizatiion and de-energization process. The interlock control devices and relays will permit the sequential energization and de-energization of the phase shifting transformers at zero phase-shift with no load and will prevent energization or de-energization of the transformer at other than zero phase shift with no load. In addition, the Contractor shall provide local and remote lamp indication at the zero phase shift interlock condition. Wiring for the interlock control devices and relays shall be terminated at terminal blocks in the control cabinet for connection to outgoing control cables furnished by the Government.

1.4 SURGE ARRESTERS:

The surge arresters shall meet all applicable requirements of the latest 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

2. 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.

3. 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 associated transformer that the surge arresters are mounted on.

4. 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 Part 2 - Table C.

5. 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 than the top of its associated bushing (if bushings and arresters are mounted horizontally).

1.5 BUSHINGS:

The bushings shall be of a porcelain type, and shall conform to the latest ANSI/IEEE C57.19.00 and C57.19.01. 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.

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:

1. By flanged segments;

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

3. 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;

4. 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.

1.6 TERMINAL CONNECTORS:

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

a. All high voltage (345-kV) bushings on top of the transformer tank shall be furnished with studs for connection to the isolating test terminals being provided for “Doble®” testing. The neutral bushing and all surge arresters shall be furnished with NEMA Standard CC1, 4-hole type terminal pads.

b. Isolating test terminals for “Doble®” testing shall be made with copper, and shall be “PCORE Electric”, or approved equal. These test terminals shall be furnished for each 345-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 current ratings of the test terminals and their terminal connectors shall match or exceed the current ratings of the associated bushings.

For information on the PCORE Electric test terminals, see http://www.pcoreelectric.com/pro ducts/pcoretestterminals.asp.

1.7 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 and the monitors. 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, Table D and E for bid CLIN 00001.

1.8 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. Western prefers the use of Weidmann Systems International for insulation components used in transformers which includes insulation boards, insulation paper, various insulation components, high temperature NOMEX winding insulation, and Weidmann wire products for the construction of the windings. 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.

If transposed conductor is utilized for the transformer windings, polyvinyl acetal or formal film insulation may be used to insulate the strands of the transposed conductor provided the specially treated paper is used as the main conductor insulation.

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

1.9 CORE:

http://www.pcoreelectric.com/products/pcoretestterminals.asp http://www.pcoreelectric.com/products/pcoretestterminals.asp

Nuts, bolts, and clamps of the core assembly shall be provided 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).

1.10 OIL PRESERVATION EQUIPMENT:

The oil preservation system provided shall operate under the pressure limitations outlined under paragraph 1.11 (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 the following system of oil preservation as defined in the latest ANSI/IEEE C57.12.80:

1. CONSTANT PRESSURE SYSTEM: For the constant pressure system furnished, 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 underfilling during installation.

1.11 TANK:

This transformer may be constructed using multiple tanks. 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 Contracting Officer, all piping connections shall be made with flanged joints. Flanges shall be welded to pipe sections and bolted together with suitable gaskets. 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 furnished 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 the constant pressure system of oil preservation 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 specified in solicitation

2. LOSS OF GAS OR OIL: The constant pressure 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.

1.12 CONNECTIONS BETWEEN TANKS:

The series transformer and exciting transformer tanks (if separate) shall be connected by one of the following methods:

1. By flanged throat connections with insulated cables or bus supported on an insulating structure and a free interchange of oil permitted between the tanks; or

2. By enclosed bus between bushings on each tank. All bushings shall comply with paragraph 1.5.

Provisions shall be made in each connection for normal expansion and contraction with a maximum differential settlement of 2 inches between the tanks.

1.13 BASE:

The transformer tanks shall be provided with a fabricated structural-steel base. The base shall be provided with pulling eyes to permit pulling the transformer. 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 to be furnished 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 Table A.

1.14 COOLING EQUIPMENT:

The power supply for cooling equipment will be Government furnished at nominal 240, three-phase.

One feeder circuit will be provided 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 indicated in this specification. 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.

For transformers rated above 10,000 kVA, the 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 leads for the fan motors shall be enclosed in liquid-tight, flexible conduit. As an alternate, the connections to the supply circuits may 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.

1.15 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 excepting temperature which shall be calibrated in degrees Celsius. 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 and ambient temperature in the main tank and the series tank. If a LTC is ordered, a RTD shall also be provided to measure top oil temperature in the LTC compartment. RTD’s shall be 3 wire 100 ohm platinum Class A sensors and shall be wired as inputs to transformer monitoring system specified elsewhere.

2. SUDDEN PRESSURE RELAY: A separate sudden pressure relay complete with seal-in relay and control switch shall be provided for the main tank, the series tank, the LTC and wherever else the Contractor deems necessary. The relay shall be a Qualitrol type Model 900-009 or equal and shall be mounted to the transformer with a full-flow ball valve. The seal-in relay shall be a Qualitrol Model 909-200-01 or equal. 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.

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 SERIES 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.

Semaphore and alarm contacts shall be provided on the device to give visual and electrical indication of operation.

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. OIL LEVEL GAUGE: This device shall have one low-level contact for alarm and one additional lower-level (critical level) contact for tripping. There shall be a gauge for the main tank, series tank, and the load tap changer.

7. OIL DRAIN VALVE: This valve is to be furnished with oil sampling device and shall be a globe type.

8. UPPER AND LOWER FILTER-PRESS CONNECTIONS:

9. 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.

10. PRESSURE-VACUUM GAUGE: one for the main tank and one for the series tank.

11. 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 4/0 AWG copper cable.

12. 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.

13. 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 909-200-01 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.

14. WEATHERTIGHT BREATHER:

15. SUMP CHAMBER AND DRAIN VALVE IN RESERVOIR TANK:

16. CONNECTION BETWEEN TANKS WITH SHUT OFF VALVE (If two tanks supplied.)

17. ELECTRONIC ON-LINE DISSOLVED GAS ANALYZER: The Government has already purchased a Severon TM8 with oil moisture, and temperature sensor including fiber optic Ethernet. The TM8 will be externally mounted from the main control cabinet. The Contractor is responsible for making armored provisions to interconnect copper and fiber cables and conductors between the two cabinets. Software to setup, interrogate, retrieve and view data shall be provided.

18. ELECTRONIC CONDENSIVE BUSHING POWER FACTOR AND CAPACITIVE ANALYZER

AND TRANSFORMER MONITOR: This monitor shall be used for monitoring the transformer HV, LV, and TV bushings, transformer temperatures, and transformer cooling systems. The transformer manufacturer shall install the monitor 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, etc). The monitor shall be capable of DNP 3.0 communication using fiber optic cable and function as a data concentrator. Software to setup, interrogate, retrieve and view data shall be provided. The monitor shall be equal to the Dynamic Ratings, Incorporated DRMCC Model T3 including the fiber optic temperature probe.

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. TEMPERATURE MONITOR: Contractor shall use a Schweitzer Engineering Laboratories

(SEL) 2414 transformer monitor (model number: SEL 2414-21A1A9174851000) 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 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. .

20. LOAD-TAP-CHANGER MONITOR AND VOLTAGE REGULATOR: The Contractor shall add load-tap-changer monitor and voltage regulator functions to the bushing and transformer monitor specified elsewhere in these specifications. The load tap changer monitor and voltage regulator shall monitor LTC oil compartment temperature, LTC motor current, and LTC tap position. The voltage regulator function shall use transformer load current and voltage inputs.

The current input shall be derived from a bushing current transformer dedicated for that purpose. The voltage input will be provided from an existing instrument transformer on the 345-kV substation bus. The voltage regulator function shall be capable of paralleling with another transformer for load sharing using master/follower, VAR sharing, and reverse reactance paralleling methods. The load tap changer monitor and voltage regulator shall be equal to the Dynamic Ratings, Incorporated DRMCC Model T3-9200.

21. FIBER-OPTIC TERMINATION AND INTERCONNECTION CENTER: Corning WIC-024 Fiber

Wall-mount Interconnection Center with multimode ST inserts shall be mounted in the same control cabinet where the monitoring equipment described above is located. Fiber entryways shall be kept clear of terminal blocks, auxiliary relays, wire bundles, etc.

22. A MINIMUM OF TWO CIRCULAR, BOLTED MANHOLE COVERS SHALL BE

PROVIDED: They shall be located 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

1.16 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. Examples of short-circuiting type terminal blocks are: General Electric Company type EB27BO6S and Marathon Catalog No. 1506 SC. See paragraph 1.24 for standard drawing requirements. Splices are not allowed in current transformer secondary leads.

Control cabinet(s) shall be provided 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. See paragraph 1.24 which lists the number of the drawing that shows the approved grounding method of cables that are furnished by others. Shielded cable grounding shall be in accordance with the standard drawings which are provided for informational purposes only.

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. The Government will furnish a 240/120-volt single- or three-phase auxiliary power feeder circuit. Conductor 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 paragraph 1.25. 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: A light equipped with a safety shield shall be provided 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 separate separately fused 120 V ac supply circuit protected by a circuit breaker.

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 for Item 001.

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, 20-ampere, 120-volt, 2-pole, 3-wire, polarized, duplex, grounded receptacle outlet with a built-in ground-fault circuit interrupter connected to a separate 120 V ac supply protected by a circuit breaker shall be furnished 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, gasketed lift cover. Receptacles shall be Pass and Seymour Catalog No. 2091, or equal.

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.

1.17 TERMINAL BLOCKS:

Terminal blocks for power wiring shall be of the heavy-duty type for insulated copper cable. The size of this cable will be determined by the Government after actual power requirements of the transformers are known.

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. An example of a terminal block meeting the above requirements is:

1. General Electric Company Type EB25B12.

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. 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.

1.18 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.

All terminations of wire shall be made with pre-insulated, pressure-crimp-type terminal connectors with ring tongues equal to an Altech insulated, polypropylene sleeve, tin plated copper tube ferrule as shown at http://www.altechcorp.com/PDFS/New_Blocks/Ferrules.pdf. 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 http://www.altechcorp.com/PDFS/New_Blocks/Ferrules.pdf 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 provide a barrier such as the EPDB512 from AutomationDirect.

1.19 CONTROL AND PROTECTION FOR TWO PHASE SHIFTING TRANSFORMERS OPERATING

IN PARALLEL:

The contractor shall provide the control equipment required to operate two phase shifting transformers in parallel. When one phase shifting transformer is out of service, the control equipment shall be suitable for the control of the remaining unit.

1.20 INSULATING OIL:

1. GENERAL: All electrical equipment shall be designed to operate with oil which conforms to the requirements of the latest revision 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 and instrument transformers identified by its serial number) requiring insulating oil shall be permanently marked and certification furnished to certify that the oil contains less than 2 parts per million PCB when the equipment is manufactured. If the oil is shipped separately, the Contractor shall also furnish certification that the oil contains less than 2 parts per million PCB. 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:

Type of Test ASTM Method Test Limit

Dielectric Strength D 877 30-kV minimum

3. DELIVERY: The oil shall be delivered to the required delivery location in accordance with solicitation requirements.

1.21 FACTORY ASSEMBLY AND TESTS:

The transformer shall be completely assembled at the factory and shall be subjected to the following tests, by and at the expense of the Contractor, in accordance with ANSI/IEEE C57 and IEC/IEEE C57.135 unless otherwise indicated. Test instrument requirements shall be in accordance with ANSI C39.1 for 0.25-percent accuracy or shall be in accordance with 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 oscillograms.