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ATTACHMENT F MATERIAL SPECIFICATION FOR TRANSFORMER #2
1.0
SCOPE
This material specification covers oil-immersed 15/20/25MVA 3Ø, 11.5-117.875kV, two
winding, Generator Step-Up (GSU) Transformers in accordance with the following
descriptive specifications.
2.0
NATIONAL STANDARDS
The GSU transformers shall be manufactured, tested, and furnished according to the latest
edition, revision or amendments to the applicable standards of ANSI, NEMA, and IEEE
except as specifically noted in this specification. The equipment is required to meet
OSHA standards.
3.0
MODIFICATIONS TO REFERENCE STANDARDS
3.1
Ratings
General Ratings: The power transformer shall be outdoor, three-phase, two winding 60Hz,
65° C temperature rise, 80° C hot spot winding temperature rise with FR3 fluid for
operation at an elevation up to 3300 feet rated 15/20/25MVA at 11.5-117.875kV.
The transformer shall be rated on ONAN/ONAF/ONAF or ONAN/ONAF/OFAF basis.
The windings shall be connected Delta on the 11.5 kV low side and Wye on the
117.875kV high side for use on a grounded Wye system. The angular displacements
between the high voltage and low voltage windings shall be 30° leading as shown below.
The polarity of the transformer shall be subtractive.
Basic Impulse Level: The 117.875kV high voltage winding shall have a BIL withstand
rating of 450kV. The 11.5 kV low-voltage winding shall have a BIL withstand rating of
110 kV. The neutral end of the high voltage winding shall have a withstand rating of 60
kV.
3.2
Transformer Impedance
MATERIAL SPECIFICATION
EUGENE WATER & ELECTRIC BOARD - EUGENE, OREGON
AUGUST 14, 2015
GENERATOR STEP UP TRANSFORMER 11.5-117.875 kV
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The impedance H to X shall be 7.5% on a 15MVA base for 15/20/25MVA transformer
with the DETC on the 117.875kV tap.
3.3
Construction
The transformer shall be constructed of only the highest quality materials. All insulation
material shall be of the thermal upgrade type. All blocking material shall be high-density
transformer board, Weidmann, Type TX2 or EWEB approved equal.
The manufacturer shall be able to demonstrate during the design review, the design of the
insulation system employed through finite element methods. An acceptable
demonstration would be the static voltage plots for each of the windings.
The coils will be disc- or helical-type, pre-sized, clamped, and braced to provide adequate
short-circuit strength. The Bidder shall submit a drawing or picture showing the coil
bracing system to be used in the transformer. The manufacturer shall supply calculations
for the maximum stresses for different fault conditions and tap positions as requested by
EWEB. The inner winding buckling stress shall be specified for both the free
(unsupported) and forced (supported) buckling. In addition, calculations for all buckling,
loop, radial bending, axial bending, tipping and radial spacer stresses for all windings in
all tap positions. The maximum axial forces and the withstanding capability of the end
support shall be supplied prior to the design review.
Vertical clamping force shall be uniformly applied to the entire horizontal surface of the
one-piece upper and lower pressure plates. All windings shall have full-circumference
clamping. Partial circumference block between the full-circumference pressure plate and
the top and bottom frames shall not be allowed. The inter winding straps (flinch plates)
tying the upper and lower support frames together shall be stainless steel. Any
manufacturer that uses jacking bolts as a standard design will not be considered. Any
system using jacking bolts to apply pressure to the coils shall not be allowed.
The ampere turns per unit height of all windings including, but not limited to, high
voltage, and low voltage, windings, shall be equal from the top to the bottom of the
winding in the 117.875kV position. Rectangular winding shall not be allowed. Only
round windings with copper conductor shall be allowed.
Upon the request of EWEB the Bidder shall submit a drawing showing the coil winding
and interconnections of the type shown below. (The drawing is only to show the type of
drawing required and does not indicate that this type of winding configuration is
necessarily preferred by EWEB.) The crossovers between discs and other bends in the
MATERIAL SPECIFICATION
EUGENE WATER & ELECTRIC BOARD - EUGENE, OREGON
AUGUST 14, 2015
GENERATOR STEP UP TRANSFORMER 11.5-117.875 kV
ES3-9.146
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ATTACHMENT F MATERIAL SPECIFICATION FOR TRANSFORMER #2
magnetic wire shall be wrapped with additional insulation. All bends in the magnetic
wire for connections to leads shall be minimized to the maximum extent possible.
When the winding of the coil is complete and prior to assembly on the core, the coil will
be pre-sized. The pre-sizing process will consist of drying the individual coils; and then
the individual coils will be pre-sized by hydraulically pressing the coil to the calculated
pre-loading stress to determine the height of the coil. All coils will be sized to the same
height. Preference will be given to a manufacturer that individually dries the coils via the
vapor-phase process and impregnates the coils with insulating fluid while the coils are
under full vacuum.
The core shall be circular, built with the highest quality grain-orientated silicon core
steel. The core shall be designed so that the flux density does not exceed 1.7 Tesla at
110% of nominal voltage. Core laminations shall not exceed 0.012 inches in thickness.
The manufacturer shall employ burr detection and mitigation such that the maximum burr
height does not exceed 30 microns. The core shall be epoxy-coated to help reduce the
noise level of the transformer. Each layer of the core steel shall be sequentially cut and
stacked in the same order as the core steel is cut. The top and bottom yokes of the core
shall be single sheets of steel that run the full length of the yoke to minimize the number
of joints in the core. Scrap-less mitered cores shall not be allowed.
The core will be supported with a combination of epoxy and blocks of high-density and
high-temperature material. The insulation between the core and the end frames to
support the core laminations and distribute the top and bottom frame pressure must be
MATERIAL SPECIFICATION
EUGENE WATER & ELECTRIC BOARD - EUGENE, OREGON
AUGUST 14, 2015
GENERATOR STEP UP TRANSFORMER 11.5-117.875 kV
ES3-9.146
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ATTACHMENT F MATERIAL SPECIFICATION FOR TRANSFORMER #2
blocks of high-density and high-temperature material. Double nutting shall be used for
all bolts in the clamping structure for the core and coil assembly.
The manufacturer shall photograph the core and coil assembly prior to tanking. Photos
shall show all sides of the core and coil assembly including a top view. These photos
shall be provided to EWEB for review and included in final documentation.
3.4
Internal Connections
All connections of winding to lead shall be made by brazing or full-circumference crimp
connection wrapped with foil-faced tape. All power leads shall be routed through highdensity tubing for straight runs of distances greater than 12 inches. All leads shall be
rigidly clamped within a lead support structure that fully supports the weight of the leads
and the forces exerted on them during a short-circuit condition. Leads shall not be
attached to the inter-phase barriers.
Lead support structures shall be attached to end frames on supports welded to the endframes. No studs shall be shot on the end-frames without full welding around the
perimeter of the stud. No ties of nylon or other plastic material shall be used. Lead bolts
shall be epoxy-locked or use two nuts on each to ensure against loosening. No black iron
or steel bolts shall be used.
3.5
Internal Frames and Bracing
The core-and-coil assembly shall be positively located in the bottom of the tank. The top
frame of the core-and-coil assembly shall be bolted to all four-tank walls or braced to all
four-tank walls and the transformer cover to prevent movement in both the vertical and
horizontal directions. Slotted bolt holes shall not be employed. No welding will be
allowed in the tank once the core-and-coil assembly is placed in the tank.
3.6
Core Ground
An external core ground shall be furnished by means of an insulated cable brought up to a
suitable bushing on the tank cover or near the top of the tank wall with a removable strap
located between the bushing terminal and tank. The bushing shall be rated not less than
5kV, and located and labeled to avoid confusion with other bushings. The transformer
shall be shipped with this bushing installed.
3.7
Transformer Drying
MATERIAL SPECIFICATION
EUGENE WATER & ELECTRIC BOARD - EUGENE, OREGON
AUGUST 14, 2015
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The core-and-coil assembly shall be dried via the proper vapor-phase process. The
maximum elapsed time between removing the core and coil assembly from the vapor
phase changer and pulling vacuum on the sealed transformer tank shall not exceed 8
hours. If the 8-hour exposure time is exceeded, the manufacturer shall pull a vacuum of
50 microns or less for a period of 4 hours for each hour or portion thereof that exceeds
the 8-hour exposure time.
3.8
Tank
All tanks shall be made of steel. The tank, including the radiators and accessories, shall
be designed for a maximum pressure of 15 psig and to withstand a full vacuum, including
the barrier between transformer and the LTC tank. The tank wall reinforcement shall be
fully enclosed with all seams, joints, and end plates continuously welded on flat surfaces
of the tank. All tank seam welds shall fully penetrate to the inside of the tank. Only
stainless steel studs shall be used on the tank and the studs shall be completely welded
around the perimeter of their base. All nuts, washer, and lock washers shall be siliconbronze, or brass.
Transformer shall be sealed tank type with welded cover. During welding of the
transformer cover, an inorganic gasket will be permanently located between the cover
and the tank flange to prevent weld spatter from entering the tank. Covers on all
manholes and inspection openings shall be bolted on. All bushings shall be bolted on.
The transformer must be designed for full vacuum filling.
The tank cover shall be domed and external features shall be designed to prevent the
collection of water. Doming the tank cover by flexing and welding it to the main tank or
any other means that places stress on the cover weld or main tank shall not be allowed,
except where the top frame of the core-and-coil assembly is rigidly connect to the
transformer cover. All external devices that are connected to the top of the transformer
via a gasketed connection shall have the collar continuously welded to the top of the tank.
All gasketed surfaces shall be provided with gasket recess and gasket compression-limit
stops. All gaskets in contact with oil-bearing surfaces shall be nitril (Buna-N or TG-65)
rubber.
The completed tank shall be tested at 10 psig for a period of 24 hours without any change
in pressure to ensure the tank can hold the maximum pressure. During this test the tank
will be equipped with a Qualitrol or equal pressure relief device with a minimum
actuation pressure of 15 psi (for a Qualitrol model 208 or 213 this would mean a nominal
pressure rating of 17 psi). If the manufacturer elects to perform this test with transformer
oil-filled, the head space will be pressurized at 10 psig and the pressure on those portions
of the tank below the oil level will be 10 psig plus the head pressure of the oil. The
MATERIAL SPECIFICATION
EUGENE WATER & ELECTRIC BOARD - EUGENE, OREGON
AUGUST 14, 2015
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transformer shall be completely assembled during this test including all radiators, fans,
pumps, bushings and all other accessories supplied by the manufacturer including
lightning arrestors, if applicable. Test results shall be documented and included in final
testing report to owner to review.
The tank stall be fitted with a Qaulitrol model XPRD (Extra Protection Relief Device).
The pressure relief device shall be set at 10 psig and the vent pipe shall be designed to
prevent oil from spraying out on the transformer or other equipment, and shielded to
inhibit animal access. Alarm contacts on the pressure relief device shall be wired to the
control cabinet terminal blocks.
3.8
Bushings
High-voltage line bushings will be located on the transformer cover in ANSI Segment 3.
All high-voltage bushings shall be of the transformer draw-lead type with a minimum
current rating of 800 Amperes. The high voltage bushings shall be physically
interchangeable with circuit breaker bushings of the same BIL rating.
The high voltage bushings shall be constructed of oil-impregnated paper and shall be on
the condenser principle. Bushings shall be a fiberglass tube construction with flexible
silicon rubber sheds or similar material that is hydrophobic, resist UV radiation, and
resists ozone. All bushings shall have a voltage tap for power-factor testing. All highvoltage bushings shall be liquid-filled with liquid level indication visible from the ground
and have a 550kV BIL rating and a minimum creepage based on the latest revision of
IEEE C57.19.100, “Medium” contamination level, at the nominal voltage. Provide a
NEMA standard four (4) hole, 800 Amp, stud connector on each of the high voltage
bushings.
Three (3) LV phase bushings and one (1) HV neutral bushing shall be located on the
transformer cover in ANSI Segment 1.
The low-voltage and neutral (HO) bushings shall have a minimum current rating of 2000
Amperes and shall be bottom-connected. The low voltage bushings must have a 150kV
BIL rating. All bushings shall meet all requirements of the latest ANSI Standard C 76.1
for bushings for power circuit breakers and outdoor transformers. All bushings shall be
ANSI 70 Light Gray in color. Pcore catalog number 88743-70 or EWEB approved equal.
Provide a NEMA standard four (4) hole 2000 Amp, stud connector, on the low voltage
bushings.
All bushings and their associated mountings shall be suitable for washing by a stream of
water under high pressure when the transformer is energized without admitting water into
MATERIAL SPECIFICATION
EUGENE WATER & ELECTRIC BOARD - EUGENE, OREGON
AUGUST 14, 2015
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the bushing or the transformer, regardless of the angle at which the stream of water
impinges on the bushing or the associated mounting.
3.10
Parallel Operation
The transformer shall be capable of being operated in parallel with a similar unit.
Therefore, EWEB reserves the right to require paralleling information at any time.
3.11
De-Energized Tap Changer (DETC)
A DETC shall be located in the high voltage winding and the tap positions shall be
123.76, 120.82, 117.875, 114.92, 111.98 kV. The DETC shall be rated at 150% of the
full forced cooled rating of the transformer. All DETC contacts shall be silver-to-silver.
The switch must have been tested in mineral oil at the maximum top fluid temperature of
the proposed transformer when operated fully loaded in a 40° C ambient temperature at
rated current. The maximum temperature of any component of the switch shall not
exceed the temperature of the insulating fluid by more than 10° C. The Bidder shall
submit a copy of the test upon request.
The DETC shall have the following ratings:
Short-Circuit
Current
15 kA
BIL
(kV)
550
Peak Current
Withstand
6 kA
Peak Current
Duration
3 Seconds
All three phases of the switch shall be operated by a hand-wheel or manual-drive
mechanism located on the outside of the transformer tank. The hand-wheel or manualdrive mechanism of the DETC switch shall be lockable with a standard padlock when in
any of the operating positions of the switch to prevent movement of the switch during
operation. The DETC shall be a MR Type Deetap DU.
3.12
Lightning Arresters
All lightning arresters shall be gapless station class with polymer housings. The lowvoltage arresters shall be Cooper catalog number UX00900749A11 and the high voltage
arresters shall be Cooper catalog number UX09607649A11 or EWEB approved equal.
The manufacturer shall provide three (3) high-voltage arresters rated 96 kV and three (3)
low-voltage arresters rated 9 kV.
MATERIAL SPECIFICATION
EUGENE WATER & ELECTRIC BOARD - EUGENE, OREGON
AUGUST 14, 2015
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The top of the NEMA four (4)-hole connector at the top of the arrestor is to be at the
same height and centerline as the NEMA four (4) hole connector of the associated
bushings.
All lightning arresters shall be gray in color.
The mounting brackets shall be drilled with three (3), 5/8-inch diameter holes on a 10-in
B.C. A line between two of the holes shall be perpendicular to the tank wall.
The manufacturer shall also include a minimum 1/4”x2” copper bus bar for grounding the
arresters. The lightning arresters shall be double-grounded with each end of the copper
bus bar terminating at a separate ground pad at the base of the transformer. The copper
bus bar shall be attached to the transformer at a minimum of every 24 inches. The copper
bus bar shall be routed such that the neutral bushing can be connected to the bus bar with
a minimum amount of 500MCM-stranded copper. Additional copper bus should be
installed to connect HV arrestor ground bus with LV arrestor ground bus. The copper
bus bar shall attach at all four (4) corners of the transformer to a NEMA ground pad in a
way that allows for EWEB to connect station grounds to the copper bus bat as shown in
EWEB standard EC3-6.0501.
3.13
Current Transformers
Provisions shall be made to allow for the mounting of two (2) bushing-type multi-ratio
current transformers of the size specified below in each of the 117.875kV and 11.5kV
bushing wells.
The transformers shall be supplied with the bushing type current transformers specified
below:
Terminals
H1, H2, H3
H1, H2, H3
X1, X2, X3
X1, X2, X3
H0
Full-Winding
Amperes
600
600
N/A
N/A
600
Relay
Accuracy
C400
C400
N/A
N/A
C400
Rating
Factor
2.0
2.0
N/A
N/A
2.0
The current transformers shall be of the 5-lead type with ratios as listed in ANSI C57.131968 Table 8. All taps for each current transformer shall be connected to a GE type
MATERIAL SPECIFICATION
EUGENE WATER & ELECTRIC BOARD - EUGENE, OREGON
AUGUST 14, 2015
GENERATOR STEP UP TRANSFORMER 11.5-117.875 kV
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ATTACHMENT F MATERIAL SPECIFICATION FOR TRANSFORMER #2
EB27B06S shorting-type terminal located in the control cabinet for customer use. All
wiring between the CT terminal boxes and the control cabinet shall be in rigid conduit.
All the current transformers specified above are in addition to the necessary current
transformers as required for the specified accessories.
3.14
Auxiliary Power Source
Manufacturer shall provide terminals in the control cabinet for customer connection of
120/240V, single-phase, three-wire source and 125VDC ungrounded two-wire source.
EWEB will provide 120/240V single-phase, three-wire, 60 Hz source for operation of all
transformer auxiliaries, including the cooling equipment. The manufacturer shall provide
an AC load schedule or recommend circuit size for AC service to transformer.
EWEB will provide 125VDC ungrounded two-wire source for DC control voltage.
3.15
Cooling Equipment
The transformer shall be designed for continuous self-cooled operation. The self-cooled
top oil temperature rise by resistance shall not exceed 65° C, and hottest spot winding
temperature rise shall not exceed 80° C, when cooled with FR3 fluid. The manufacturer
shall demonstrate the capability to model transformer heading using FR3 and provide this
model/calculations upon request.
The transformer shall be capable of being loaded continuously to 15,000kVA self-cooled
and 25,000kVA with two stages of forced cooling without exceeding the specified
temperature rise. Such operation shall be available without any decrease in the normal
life expectancy of the insulation.
The complete transformer, including external components (bushings, etc.), as well as
internal components, shall be suitable for overload operation in accordance with ANSI
C57.92, NEMA TR-98, and IEEE 5071D5.
Cooling class of transformer with self-cooled rating only shall be ONAN. Cooling class
of transformer with self-cooled rating and two forced-cooled ratings shall be of
ONAN/ONAF/ONAF or ONAN/ONAF/OFAF.
The cooling equipment shall be controlled by winding hot-spot temperature, manual
control switches in the control cabinet, and by transformer monitoring equipment.
MATERIAL SPECIFICATION
EUGENE WATER & ELECTRIC BOARD - EUGENE, OREGON
AUGUST 14, 2015
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ATTACHMENT F MATERIAL SPECIFICATION FOR TRANSFORMER #2
Winding temperature equipment shall be furnished as follows (necessary current
transformers shall be in addition to the current transformers in paragraph 3.13).
1)
Each set of equipment specified shall include a dial-type temperature-indicating
relay with four (4) adjustable contacts each. Dial indicator design, and mounting
arrangement shall permit reading from ground level near the transformer. All
gauge contacts shall be wired to terminal blocks in the terminal cabinet.
2)
Two sets of temperature gauges with temperature indicating relays will be used;
one indicating top oil temperature and one indicating hot spot temperature.
Settings for the temperature indicating relays shall be as follows:


Top oil relay shall be set at 75° C, 80° C, 100° C and 110° C.
Winding relay shall be set at 75° C (Stage 1 cooling), 80° C (Stage 2
cooling), 110° C (alarm), and 130° C (trip).
3)
The radiators shall be galvanized panel-type and all radiators shall be removable.
In conjunction with removable radiators, manufacturer shall furnish suitable valves
on the transformer side of the radiator mounting flanges, and top and bottom pipe
taps with plugs (minimum 1/2-inch) on the radiators, to permit draining and
removal of the radiators without draining oil from the transformer tank. All
shutoff valves shall be easily accessible with all the radiators in place. Removable
radiators shall be equipped with lifting eyes, and so designed that they can be
handled without the addition of special bracing. Provide a separate oil-tight blank
flange for each radiator connection for use when the radiator is removed and
during shipment. Ensure adequate space for radiator removal assuming there will
be a fire wall between adjacent units four (4) feet higher than the highest oil
containing component on the transformer e.g. high voltage bushing, conservator,
etc and approximately eight (7) feet from any radiators mounted in Segment 2 or
Segment 4 of the transformer.
4)
For transformer cooling that includes oil circulation pumps, oil flow indicator with
alarm contact shall be furnished for each pump to indicate low oil flow. Oil pumps
shall be located near foundation level; manufacturer shall furnish suitable valves
on both sides of each pump and pipe tap with plug (minimum 1/2-inch) at the
lowest point on the pump section between the valves, to permit draining, removal,
and reinstallation of pump without draining oil from the radiators or the
transformer tank. The power supply to pumps shall not be made through
connectors, which must also seal the oil system.
MATERIAL SPECIFICATION
EUGENE WATER & ELECTRIC BOARD - EUGENE, OREGON
AUGUST 14, 2015
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5)
Cooling fans shall be located only on the sides of the radiators to provide
maintenance accessibility with adequate safety clearances from transformer live
parts. The fan guards are to be stainless steel or hot-dipped galvanized and shall
meet all OSHA requirements, including that a 1/2-inch diameter rod shall not
penetrate the guards. Provide a sufficient number of low-speed propeller-type fans
to allow any one cooling fan to be taken out of service without exceeding top oil
temperature rise limits while operating at rated load. Fan blades to be one-piece
cast aluminum or stainless steel. All fan motors are to be totally enclosed with
plug/receptacle cord connections. Fan motors shall be equipped with double
sealed, grease-lubricated ball bearings and shall not require lubrication during the
life of the motor.
6)
The mounting hardware for all cooling and any cooling related equipment,
including, but not limited to, fans, radiators, radiator bracing, radiator pumps, flow
indicators and flexible connectors, valves, shall be galvanized and include flat
washers, lock washer, and nuts.
7)
A 100 ohm platinum resistance temperature detector (RTD) shall be installed in a
separate tank well, with a load current biasing heater similar to that employed in
hot spot gauge. The RTD signal shall be input directly to the Transformer Monitor
(SEL-2414). RTD’s shall be easily replaced without removing any additional
components.
8)
For all transformers an auxiliary relay shall be furnished, to provide alarm
indication of loss of power to the cooling equipment, with a 30-second time delay
to avoid alarming for momentary loss of power.
9)
The cooling switching relays shall remove electrical power from all “hot”
conductors to the cooling equipment. The manufacturer shall also furnish all
necessary wiring, including connections between the cooling equipment and the
control cabinet (paragraph 3.18) in rigid conduit.
10)
All cooling equipment shall be free from any and all undue or harmful vibration.
11)
The cooling fans shall be operated from contacts on the temperature gauges,
manual control switch in the control cabinet, and from the transformer monitor
equipment in the control cabinet as programmed by EWEB. The gauge settings
are discussed in section 3.15 point #2. The manual control switch shall have OFF,
AUTO, and MANUAL settings; OFF removes control power from the specific
group of fans, AUTO enables control power and allows the gauge or transformer
monitor to govern operation and MANUAL operates the group of fans
MATERIAL SPECIFICATION
EUGENE WATER & ELECTRIC BOARD - EUGENE, OREGON
AUGUST 14, 2015
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continuously. The transformer monitor shall be connected to the fan control
circuits as shown in the EWEB standard drawing EC3-4.2100 but shall be
programmed by EWEB.
3.16
Oil
The transformer will be supplied and filled with new natural ester fluid, Cargill
Envirotemp FR3. Residual natural ester fluid shall be shipped in 50 gallon barrels or
other shipping containers as approved by EWEB.
The transformer tank shall include a weather resistant sign specifying that the transformer
has been designed for and filled with FR3 insulating fluid. Additionally the nameplate
shall specify that the unit was designed for and filled with FR3 insulating fluid.
The FR3 oil supplied with the transformer shall be handled in accordance with the latest
revision of Cooper Power Systems Bulletin 97080.
If the transformer is shipped with dry air or nitrogen, the oil shall be delivered on date
and time, as specified by EWEB.
3.17
Oil Preservation System
The oil preservation system shall be a positive pressure system and designed so that
oxygen is excluded from the preservation system. EWEB may specify one or the other
preservation system (Nitrogen Pressure or Conservator Oil Preservation System) as part
of specific requests for quotation.
1) Nitrogen Pressure: A nitrogen gas pressure system shall include a gas cylinder
installed in a insect/bug proof cabinet mounted on the transformer tank approximately
2" from transformer base; a three stage pressure regulating system; and a pressurevacuum gage, pressure relief valves, and alarm contacts to indicate high and low
transformer gas pressure and low nitrogen cylinder gas pressure. A valve for purging
the gas space shall be provided. Purging fitting shall be tapped into opposite side of
transformer tank from nitrogen gas inlet. The full nitrogen cylinder installed in the
cabinet shall become the property of EWEB.
2) Conservator Oil Preservation System: A conservator oil preservation system shall
include an expansion tank and a nitrile or urethane air cell vented to outside air
through an auto-recharging, dehydrating breather system. The maintenance-free
breather will contain 600 grams of silica gel desiccant that is automatically dried
based upon an adjustable schedule of daily to once every two weeks. The auto-
MATERIAL SPECIFICATION
EUGENE WATER & ELECTRIC BOARD - EUGENE, OREGON
AUGUST 14, 2015
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recharging, dehydrating breather system shall be a Waukesha Electric type ARDB.
One expansion tank is preferred, located on either end of the transformer (per ANSI
C57.12.10 Segment 2 or Segment 4). The air cell shall be designed for flange
installation (clamps not allowed), and shall prevent contact between oil in the
expansion tank and the air. The expansion tank shall be of sufficient volume to
operate through an ambient temperature range of -40° C to +50° C without causing
the low oil level alarm contacts to close at the lower limit, and without exceeding the
recommended full oil level at the upper limit. An air cell failure relay shall be
furnished to provide an alarm for the conservator system when it detects a bladder
leak. The auto-recharging dehydrating breather system shall be located so it can be
safely maintained with the transformer energized. A Buchholtz-type relay shall be
furnished, equipped with two float mechanisms that contain two normally open
contacts, one associated with each float. The petcock furnished on the Buchholtz
relay for taking samples and releasing gas from the top of the relay housing shall be
located in the same segment as the control cabinet and located that samples may be
taken 4 feet above ground level.
Provision shall be made for testing the relay operation without removing the relay
from the transformer. The relay shall be readily removable for maintenance purposes
without draining oil from the conservator or the transformer. The relay shall be
provided with an external device to operate the switch contacts and thereby test the
contact operation together with the circuit continuity of the relay. Suitable valves
shall be furnished in the oil line between the expansion tank and the main transformer
tank, one valve on each side of the Buchholtz-type relay. A by-pass valve shall also
be furnished. All of the valves between the main tank and the expansion tank shall be
vacuum tight. A temporary pressure-vacuum gauge shall be furnished for monitoring
the pressure in the main transformer tank during shipment.
3.18
Control Cabinet
1) A stainless steel NEMA 4 control cabinet with gasketed doors with a 3-point latch
operated by a single handle shall be furnished to house cooling equipment control
devices, the electronic transformer monitor, and terminal blocks for terminating all
auxiliary wiring shall be mounted on the Segment 1 wall of the transformer tank. The
compartment shall be furnished with two heaters, one that operates continuously and
one heater that is thermostatically controlled, or an EWEB approved alternative
heating system. All thermostats shall be adjustable from 45 F to 90 F. The control
cabinet shall be supplied with screened vent openings with fiberglass dust filters in
order to avoid condensation within the cabinet. EWEB will bring all external
auxiliary power and control wiring in conduit to this cabinet. This cabinet shall be
MATERIAL SPECIFICATION
EUGENE WATER & ELECTRIC BOARD - EUGENE, OREGON
AUGUST 14, 2015
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furnished with removable bottom plate(s) for drilling by EWEB. These plate(s) shall
be supplied with gasket(s) to provide a weather tight connection. Controls, terminal
blocks, and other devices requiring access for operation and maintenance shall be
mounted in the compartment at a height less than six feet above foundation level.
The door swing shall be limited to 36” and feature a maintenance free locking
mechanism that will keep the door open after opened beyond a certain point.
2) All auxiliary power and control wiring shall consist of highly stranded copper, SIS,
switchboard wire, 600V class, with insulation (or outer covering over the insulation)
that is flame-retardant and heat, oil, and moisture retardant. Where possible, wiring
inside the control cabinet shall be run in plastic wire duct with covers. Where it is not
possible to contain the wiring in the duct, the wiring shall be wrapped with plastic
spiral binding. Wire bundles crossing hinges shall be spiral bound and securely
clamped to both the door and the cabinet, and run parallel to the hinge for at least half
the door length. The plastic duct and spiral binding shall be manufactured by the
Panduit Company, Hoffman or EWEB approved equal. Wiring runs outside the
control cabinet shall be in rigid conduit except for short, flexible leads from conduit
boxes to fans, pumps, and relay and alarm devices, which may be in seal-tight conduit
or weatherproof cable; each of these leads shall be furnished with a separable,
weatherproof connector. Both ends of all wires and all terminal block points shall be
clearly marked with the designation shown on the manufacturer’s wiring diagrams.
No control circuit shall be spliced. All installed conduits shall be oversized by 25%
to allow for future expansion.
3) All devices shall be identified with permanently attached labels, which correspond to
the wiring drawing provided by the manufacturer.
4) The control cabinet shall contain terminal blocks for terminating all auxiliary
equipment wiring, wiring from the cooling equipment, all alarm and relay contacts
and all current transformer secondary leads.
5) Alarm and relay contacts shall be normally open, ungrounded. Both sides of each
contact shall be isolated from all other contacts and independently wired to the
control cabinet.
6) All auxiliary relays supplied or installed by the manufacturer shall be Square D Type
X, or EWEB approved equal.
7) All cabinet doors shall be provided with door pockets large enough to accommodate a
3-inch wide three-ring binder. In addition to the items mentioned above each door
MATERIAL SPECIFICATION
EUGENE WATER & ELECTRIC BOARD - EUGENE, OREGON
AUGUST 14, 2015
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shall control a light inside the control cabinet and the control cabinet shall contain a
20A non-GFCI duplex outlet.
8) Control circuit wire size shall not be less than 12 AWG except when wiring to
customer-specific devices that will not accept 12 AWG. In this case, the largest wire
size the device will accept shall be used. All control circuit wiring shall be
terminated with un-insulated ring-type terminals except for devices which will not
accept a ring-type terminal. All power circuit wiring shall be sized and protected for
the current and voltage required.
9) All current transformer secondary wiring shall be 10 AWG with un-insulated ring
type terminal connectors. Each CT shall be individually grounded inside the control
cabinet.
10) Adequate space will be provided around all devices and terminal blocks to allow for
the removal, installation, and termination of all incoming wiring. No more than two
(2) wires shall be landed under any terminal screw. The manufacturer shall provide,
where possible, ten percent (10%) of the terminals in any terminal block as spare
terminals. The manufacturer shall reserve a 10-inch high by 10-inch wide by 8.5-inch
deep space on the backplane of the control cabinet for the mounting of future control
equipment by EWEB.
11) All terminal blocks shall utilize #10 screws with 32 threads per inch and shall be
General Electric-type EB-25, with the exception of current transformer terminal
blocks, which shall be General Electric-type EB-27.
12) The control cabinet shall be completely assembled and wired at the time of delivery.
13) A fiber optic patch panel shall be mounted to the main backplane of the control
cabinet to facilitate fiber optic communications between the substation control house
and the transformer control hardware. The fiber optic patch panel shall be Corning
Single Panel Housing model SPH-01P and be equipped with Closet Connector
Housing model CCH-CP12-15T. EWEB shall furnish all fiber optic cables. The
fiber optic patch panel should be mounted in a way and location that limit the bends
required by the fiber optic cable through the control cabinet.
14) A 100 ohm platinum resistance temperature detector (RTD) with protective guard
shall be mounted below the control cabinet for use as measuring ambient temperature.
The RTD should be mounted and guarded in a way that would discourage insect
activity and limit possible physical damage. This RTD will be connected directly to
the transformer monitor.
MATERIAL SPECIFICATION
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AUGUST 14, 2015
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15) The control cabinet shall include swing out panels that house the technician interface
equipment. Equipment includes the following: no equipment shall be mounted on the
left swing panel; Transformer Monitor and Cooling Equipment control switches on
the right swing panel. All terminal blocks and other equipment are to be mounted on
the back and sides of the enclosure or as approved by EWEB.
3.19
Accessories
The following standard accessories shall be furnished with location in accordance with
the latest ANSI Standards. Dial-type gauges shall be grouped together on the control
cabinet side of the transformer to the maximum extent possible. The dial-type gauges,
valves, and no-load changer switch handle shall not protrude beyond the floor space
determined by the radiating surfaces. All gauges over 96 inches from the ground shall
have their faces tilted down at an angle of 30° from the vertical. Wells for thermometer
bulbs and liquid level gauge floats shall be within the main tank so as not to require
removal for untanking.
1) Manually operated no-load tap changer control handle shall be located on the side of
the tank within easy reach from the ground and provided with means for padlocking
in any position.
2) Magnetic liquid level gauge (with alarm contacts) set to close at the minimum safe
operating level and with trip contacts set to close at a level 2 inches below the alarm
contacts.
3) Dial-type oil thermometers with four (4) adjustable contacts each. (see section 3.15,
#2 for temperature set points)
4) Pressure vacuum gauge with alarm contacts to indicate high and low transformer gas
pressure.
5) Purge valve on the constant pressure system, together with a low N2 cylinder pressure
alarm.
6) Globe-type combination drain and lower filter valve (2” screw end) with sampling
device (3/8”). The drain valve and the oil-sampling valve shall be located so as to
allow draining or sampling from the bottom surface of the tank.
MATERIAL SPECIFICATION
EUGENE WATER & ELECTRIC BOARD - EUGENE, OREGON
AUGUST 14, 2015
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7) Ball-type upper filter valve, 2” screw end. The oil filling connection shall be
provided with deflection plates inside the main tank to prevent the force of incoming
oil from impinging on the core and coil assembly and the associated leads.
8) All valves shall be made of brass or comparable non-corrosive material. Valves,
except for the radiator port valves and the bottom drain valve, shall be of the ball-seat
type with stainless steel balls, Teflon seals or EWEB approved equal. Valves with
American Standard Pipe Threads or bolted and gasketed flanges shall be provided.
The radiator port valves shall be a 3-inch minimum flange mounted butterfly-type
valve.
9) Provide guards over any valve that may otherwise be used as a step.
10) Lifting eyes for the cover only.
11) Facilities for lifting core-and-coil assembly from tank without a spreader bar.
12) Lifting lugs for complete transformer.
13) Base to be designed for rolling, provision for pulling in both directions of centerlines
of segments. The transformer base shall permit the transformer, complete and oil
filled to be rolled over a concrete slab on three 2-inch steel rods without distortion of
the base of the transformer.
14) Jacking provisions at four (4) corners of the base.
15) Four (4) ground pads with tapped holes for tank grounding (see EWEB Power
Transformer Grounding specifications EC3-6.0501).
16) One (1) or more hand-holes or manholes in the cover.
17) Cover-mounted mechanical pressure relief device with automatic resealing-resetting
operation and mechanical signal for indication of device operation. Indicator design
and mounting arrangement shall provide visibility from ground level near
transformer. The pressure relief device shall be a Qualitrol model XPRD (Xtra
Protection Relief Device).
18) Qualitrol rapid-pressure relay mounted on cover with seal-in relay mounted in control
cabinet. The manufacturer shall make provisions for testing the relay operation
without removing the relay from the transformer.
MATERIAL SPECIFICATION
EUGENE WATER & ELECTRIC BOARD - EUGENE, OREGON
AUGUST 14, 2015
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19) Solid metal diagrammatic nameplate with embossed data in U.S. Customary units.
20) Removed
21) A SEL-2414 Transformer Monitor (configuration 241421A3A9X3A851000) will be
used to monitor the operation of the transformer and aggregate all I/O data from the
transformer. The transformer monitor shall be mounted approximately 60” above the
foundation to facilitate reading of the front panel display. As shown in EWEB
standard drawing ED3-4.2100 (see reference drawings paragraph 3.26) this device
will receive; signals from all RTD on the transformer, all specified digital alarm
indications, and specific CT inputs. The output contacts controlling Stage 1 and
Stage 2 fans shall be included in the control circuit and the outputs shall not directly
control the fan circuit but instead control an auxiliary relay/contactor to protect the
output contacts of the transformer monitor. The device shall be powered by the
125VDC source. EWEB shall provide and install the fiber optic cable connection
between the transformer monitor and fiber optic patch panel. EWEB shall also
provide all programming for the transformer monitor.
22) The transformer shall be equipped with base plate(s) for fall protection system UniHoist Part #NUH4000-2. The plate (s) shall be welded to the transformer tank per
Uni-Hoist guidelines and include attachment points for worker D-ring during fall
protection hoist erection.
3.20
Provision for Future Installation of a Hydran
Two (2) 1-1/2” ball valves with 1-1/2” NPT female thread shall be provided on side tank
wall approximately 18” and 24” up from the bottom of the transformer tank for
installation of a Hydran.
The output end of the valve shall not be more than 1-1/2” from the oil flow.
A threaded bronze plug shall be provided for the valve.
A clear space approximately 24” vertical by 12” horizontal shall be provided on the tank
wall in the vicinity of the valve for the future installation of the electronic unit. Mounting
brackets shall be provided in this space.
The mounting brackets shall consist of two (2) 6” lengths of 3” C-channels welded to the
tank with the “C” on both channels facing the bottom of the tank with 15-3/8” between
the top of the two (2) C-channels (or something similar).
MATERIAL SPECIFICATION
EUGENE WATER & ELECTRIC BOARD - EUGENE, OREGON
AUGUST 14, 2015
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3.21
Gaskets
All manhole openings, bushing busses, or risers and any other areas where bolting is
necessary will be provided with machined surfaces with a gasket groove to limit
compression of the gasket material. All gasket material in contact with oil-bearing
surfaces shall be reusable nitrile. Gaskets and gasket material containing asbestos shall
not be used in any part of the transformer or its auxiliary equipment.
Each transformer shall be shipped with one complete set of gaskets in addition to those
required to complete assembly.
3.22
Cleaning and Painting Transformer
All surfaces of the transformer, tanks, covers, panels, etc., shall be thoroughly cleaned by
de-greasing and abrasive blasting to remove grease, scale, rust, and corrosion. All
surfaces shall then be given at least one (1) coat of rust-resistant primer.
The exterior surface of the transformer tank, covers, metal barrier, and the interior and
exterior of panels, etc., shall be given two (2) coats of finish enamel. Color – ANSI No.
61 Gray, low-gloss, Alkyd Resin Enamel. The total paint thickness shall not be less than
3 mils at any point.
The interior of all control cabinets and the tank shall be painted white.
All transformer finishes shall adhere to the latest version of the EEI Finish Guidelines for
Padmount Equipment. All manufacturers shall furnish certified test results demonstrating
that their coating system and application method meets the following minimum test
requirements:
1. Salt Fog Resistance
Per ASTM B117, 1500 hours.
2. Crosshatch Adhesion
Per ASTM D3359, tape removal per Method B.
3. Humidity
Per ASTM D2247, except at 45° C ± 1° C, there shall be no blisters.
4. Impact
Per ASTM D2794.
MATERIAL SPECIFICATION
EUGENE WATER & ELECTRIC BOARD - EUGENE, OREGON
AUGUST 14, 2015
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5. OUV Exposure Accelerated Weather Test
Exposure rate per ASTM G53; loss of gloss shall not exceed 50% as per ASTM
D523.
6. Abrasion Test – Taber Abraser
Per ASTM D4060, coating shall survive at least 3,000 abrasion cycles.
7. Oil Resistance
As related to probable mineral oil contact. Immerse two (2) test panels in mineral oil
for 72 hours, one at room temperature (20° C - 25° C) and one at 100° C - 105° C.
There shall be no apparent changes such as color shift, blisters, loss of hardness, or
streaking.
8. Moisture Condensation Resistance
Per ASTM D1735. Prior to and upon completion of exposure test, specimen shall be
tested for adhesion per ASTM D3359. There shall be 100% adhesion to bare metal
and between paint layers.
Items (9) through (12) may be provided at manufacturer’s option.
9. Flexibility
Per ASTM D1737, 180° bend.
10. Elcometer Adhesion
Must provide psi value.
11. Dry Heat Resistance
Per ASTM D2485.
12. Direct Impact
Per ASTMG 14.
3.23
Wind Loading & Seismic
Wind Loading Strength: The transformer shall be designed to withstand wind up to 95
miles/hour in its service configuration (i.e., with bushings, arresters, radiator/coolers, etc.
installed). Documentation in the form of test data or calculations (either static or
dynamic) confirming the transformer wind stand capabilities shall be provided with final
drawings per paragraph 8.2.
MATERIAL SPECIFICATION
EUGENE WATER & ELECTRIC BOARD - EUGENE, OREGON
AUGUST 14, 2015
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Earthquake Strength: The completely assembled transformers shall withstand a 0.5g
Zero Period Acceleration (ZPA) horizontal ground motion response spectra as published
in IEEE Standard 693 without damage. Dynamic testing or dynamic analysis results shall
be provided with final drawings per paragraph 8.2.
To prevent overturning or sliding during earthquakes, EWEB attaches the transformer
base to the foundation by bolting the base or clamping elements to the foundation. The
number and the locations of clamping elements shall be determined by the manufacturer.
The bottom of any clamping element shall not be less than 36” above the base of the
transformer to allow for the installation of anchor bolts.
3.24
Short Circuit Requirements
The transformer is to be designed to meet the short circuit requirements given in the short
circuit test code as per C57.12.00 and C57.12.90 latest revision.
Design test reports verifying compliance to short circuit requirements shall be provided
with bid review drawings.
EWEB reserves the right to reject any design when, in the judgment of the Engineer, the
manufacturer has not taken sufficient steps to meet the mechanical short-circuit
requirements as listed in the paragraphs above.
Performance of short-circuit tests may be considered as a possible additional requirement.
The manufacturer will include, as an alternative, a quotation for the performance of such
tests, including the system conditions under which the test will be performed and the test
procedures to be followed. The customer will advise the manufacturer at any time during
the engineering and manufacturing cycle whether such tests will be required, but no later
than two (2) weeks prior to shipment.
In addition to the above, each bidder shall submit with his proposal a complete listing of
all full-sized transformers of his manufacturer, in ratings 501 through 50,000 kVA, which
have been short-circuit tested. This list shall include all full-sized units tested, whether
they were development tests or test of customer units. The list shall indicate if the test
was a development test or a customer test. Complete ratings shall be given of each unit.
In case of units tested for or by the ultimate customer, indication shall be given on each
unit as to whether the test was successful or unsuccessful and, if tested more than once,
each subsequent test shall be so listed and appropriate comments given as to design
changes made, if any.
MATERIAL SPECIFICATION
EUGENE WATER & ELECTRIC BOARD - EUGENE, OREGON
AUGUST 14, 2015
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3.25
Transformer Loading
The transformer and all associated parts shall be suitable for loading without exceeding
loss-of-life as specified in ANSI C57.92. The manufacturer shall furnish necessary
design constants and information as is related to the loading schedules with the final
drawings per paragraph 8.2.
3.26
Reference Drawing(s)
The following reference drawing(s) are included as a part of this specification.
Drawing Number
ED3-4.2100
EC3-6.0501
4.0
Title
SEL-2414 Transformer Monitoring Schematic & Wiring
Power Transformer Grounding
ELECTRICAL TESTS
The transformer shall be filled with in-service insulating fluid (FR3 for main tank) for all
electrical tests.
Transformer will receive all routing and optional test in accordance with ANSI C
57.12.90, C 57.12.10, C 57.15, and C 57.90 including the following tests:
1. Cold resistance test on each winding on the rated voltage connection.
2. Polarity and phase relation test on the rated voltage connections.
3. No-load loss and exciting current shall be measured both at nominal rated voltage and
at 105% and 110% of nominal rated voltage, both before and after impulse tests.
Values of no-load loss and exciting current measured after impulse tests will be the
values used in determining compliance with manufacturer’s performance guarantees;
these values shall not exceed the values measured before impulse tests by more than
7.5%.
After the impulse test, load loss tests shall be performed on the unit at rated voltage,
for DETC position 1 and DETC position 5 and all at base load (15MVA). Load loss
tests shall also include tests at rated current (25MVA) and a rated voltage, for DETC
position 1 and DETC position 5.
4. H-winding to X-winding position sequence impedance shall be measured at nominal
rated voltage.
MATERIAL SPECIFICATION
EUGENE WATER & ELECTRIC BOARD - EUGENE, OREGON
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5. Zero sequence impedances shall be measured if transformer is 3-phase core form;
impedances shall be recorded in equivalent T-form, if applicable.
6. The following shall be calculated, based on measured losses and impedances;
regulation at 1.0 and 0.8 power factor, and efficiency at 1.0 power factor and 0.25,
0.5, 0.75, and 1.25 times rated load.
7. Temperature test shall be performed at the maximum forced-cooled rating (if two or
more duplicate units are ordered for manufacturer at the same time, EWEB may elect
to require temperature test on only one of such units); dissolved gas analysis shall be
performed on transformer oil samples taken immediately before and immediately
after temperature testing. The manufacturer shall establish acceptable limits for the
incremental increase of the dissolved gases listed below. These limits are to be
furnished as part of the Approval Drawing package and are subject to acceptance by
EWEB.
The manufacturer shall furnish the calculated hot-spot winding temperature rise
corresponding to the highest measured value of average winding temperature rise at
both the self-cooled rating and the maximum forced-cooled rating.
8. All dissolved gases tests (DGA) shall include the following gases at a minimum:
 Hydrogen (H2)
 Methane (CH4)
 Ethane (C2H6)
 Ethylene (C2H4)
 Acetylene (C2H2)
 Carbon Monoxide (CO)
 Carbon Dioxide (CO2)
 Oxygen (O2)
 Nitrogen (N2)
The initial DGA sample shall be taken after the unit is oil-filled and prior to any
electrical dielectric tests are performed. In addition to the DGA tests performed
immediately before and after the temperature rise test, all units will have a final DGA
test performed at the factory just prior to shipment.
9. Capacitance and insulation power factor between windings and between each winding
and ground shall be measured. A power-factor test shall be performed on all
windings and bushings at 10 kV. No winding shall exceed a 0.5% power factor. For
MATERIAL SPECIFICATION
EUGENE WATER & ELECTRIC BOARD - EUGENE, OREGON
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each high voltage terminal, an excitation current test shall be performed at 10 kV on
each DETC tap.
10. Control wiring and contacts shall be tested with 60-hertz potential of 1,000V applied
for 60 seconds.
11. One-hour, 3-phase induced potential and corona test shall be performed. The first test
voltage to be applied shall be 216 kV rms phase-to-phase and an enhancement
voltage level of 251 kV with the transformer set on the maximum DETC tap. The
test voltage shall be applied for a period of one (1) hour. Tests shall be accompanied
by continuous monitoring of partial discharge level; level shall be recorded at 5minute intervals. Measured partial discharge level shall not exceed 100 microvolts or
shall not exceed 250 pico Coulombs (including background).
12. NEMA audible sound level tests will be performed in accordance with the latest
revision of C57.12.91 without forced-cooling equipment in operation, and with two
stages of forced-cooling in operation.
13. Applied potential tests.
14. Induced potential tests.
15. Impulse test on line terminals, for the chopped wave test the time to chop shall be
between 2 and 6 microseconds. All impulse tests shall be performed with the DETC
set on the maximum tap.
16. Temperature test(s) shall precede all dielectric tests, including impulse and switching
surge tests. In accordance with ANSI C57.12.90, impulse and switching surge tests
shall precede the low-frequency dielectric tests.
17. Manufacturer’s test report shall include diagrams showing winding connections
(including windings or terminals not being tested) and voltages applied for impulse
and switching surge tests, if specified, and for 7200-cycle induced tests.
18. Insulation resistance shall be measured at 5kVDC. Test report shall include actual
readings; readings corrected to 20° C, a polarization index for each test connection
(the ratio of the 10-minute reading to the 1-minute reading); and the make, model,
and serial number of the measuring instrument. For measurements between
windings, the tank and windings not being tested shall be “guarded.” For
measurements between windings and ground, test report shall show the condition of
windings not being tested (whether “guarded” or grounded).
MATERIAL SPECIFICATION
EUGENE WATER & ELECTRIC BOARD - EUGENE, OREGON
AUGUST 14, 2015
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19. The manufacturer shall perform a Sweep Frequency Analysis (SFRA) test. The
manufacturer shall submit with the final documentation a complete diagram of the
test performed and the test report.
20. Test for unintentional core grounds shall be performed after loading for shipment at
not less than 1kV.
21. After the transformer is filled with oil at the manufacturer’s plant in preparation for
performance of transformer tests, a sample of oil shall be taken from the transformer
and analyzed to determine the level of polychlorinated biphenyl contamination, if
any. Prior to shipment, the assembled transformer will be liquid-filled and pressuretested for a minimum of 24 hours at 10 psig pressure for detecting the presence of
leaks. There shall be no drop in pressure for the successful completion of this test.
22. The manufacturer shall notify the customer of the dates the above-referenced tests
shall be performed not less than four (4) weeks prior to performing any of the tests.
23. EWEB reserves the right to witness the specified tests and will notify the
manufacturer two (2) weeks prior to the date of testing if EWEB will witness the
testing of the unit(s).
24. Certified test reports shall be provided within three (3) weeks of shipment and shall
include the results of all the tests indicated above.
5.0
BID EVALUATION
5.1
Losses
Cost of Losses = A x No-Load Losses* + B x Load Losses*
A = Cost of No-Load Losses in dollars/KW
B = Cost of Load Losses in dollars/KW
Should the combined losses of the transformer when tested exceed the guaranteed
combined losses, an amount as determined by the equation above will be withheld from
the bid price as damages. No credit will be given for actual losses that are less than the
guaranteed values.
5.2
Sound Level
MATERIAL SPECIFICATION
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Sound Costs = (C – NEMA Sound Level at 15MVA + D – NEMA Sound Level at
25MVA) * $5000.00/dB
C = Guaranteed Sound Level at 15MVA
D = Guaranteed Level at 25MVA
Acceptable Sound Levels per NEMA TR 1-2013:
25MVA transformer at 15MVA = 72dB
25MVA transformer at 25MVA = 75dB
Should the sound levels of the transformer at either load value when tested exceed the
guaranteed sound level, an amount as determined above, will be withheld from the bid
price as damages. No credit will be given for actual sound levels that are below the
guaranteed values.
5.3
Technical Alternative
Should the manufacturer choose to propose an alternative or take exception to any item or
portion of these specifications, the manufacturer shall clearly state the alternative(s) or
exception(s) and technical reasoning supporting the alternative(s) or exceptions(s).
Statements like “in accordance with manufacturer’s standard procedures” are
unacceptable and may make the Bidder’s proposal subject to disqualification.
5.4
Factory Inspection
Bidder is encouraged to document their manufacturing process and demonstrate how
their process aligns with the requirements of this specification. Bidders should highlight
their QA during manufacturer, effectiveness and experience of their testing department,
and how the manufacturer has incorporated technology into the manufacturing process.
EWEB reserves the right, prior to award of the contract, to perform a factory inspection
of the plant(s) where the transformers will be manufactured, assembled, tested, packed,
and shipped.
Bidder, along with the manufacturer’s representative (if not the same) must be prepared
to host EWEB factory inspection within 14 days of request by EWEB. EWEB must be
allowed to observe all areas of operation (reference above) to validate Bidder’s ability to
meet the requirements of the contract.
MATERIAL SPECIFICATION
EUGENE WATER & ELECTRIC BOARD - EUGENE, OREGON
AUGUST 14, 2015
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ATTACHMENT F MATERIAL SPECIFICATION FOR TRANSFORMER #2
Should a “Notice of Intent” be issued and as a result of the factory inspection EWEB is
not confident in Bidder’s ability to meet the requirements of the contract, EWEB reserves
the right to rescind its notice and reject Bidder’s bid.
6.0
WARRANTY
Bidder warrants to EWEB that any goods/equipment furnished will operate and function
in the manner represented by Bidder and will achieve the performance stated in the
material specification when operating within the design conditions described.
Bidder warrants the goods/equipment furnished is free from defects in material and
workmanship, and agrees to repair or replace any unit that is unsuitable for operating or
fails in operation during normal and proper use, including all parts and labor at no cost to
EWEB. EWEB reserves the right to complete repairs internally upon mutual agreement
or when manufacturer or assignee does not complete repairs within 72 hours of
notification. Work completed by EWEB will be covered under Warranty when
documented and performed by a qualified technician. Internal repairs will be billed to
manufacturer at current EWEB labor rates plus 20%, plus materials, payment terms are
net 30.
EWEB requires a factory representative to be present during transformer assembly at the
EWEB site, and shall inspect and approve final assembly before EWEB field tests are
performed.
EWEB requires a minimum warranty period of five (5) years after the date of final
acceptance. In addition, any defect in the design or manufacture discovered by the
manufacturer and/or the purchaser in the warranty period shall be corrected to EWEB’s
satisfaction at no cost to the purchaser.
The equipment manufacturer must have service and repair facilities capable of complete
overhaul. The manufacturer must have five (5) years experience or more in the design,
manufacturing, and testing of power transformers of this size and voltage class.
7.0
PACKAGING
All bushings and accessories susceptible to damage shall be adequately protected to
insure against damage during transit. The transformer will be filled with dry nitrogen at a
minimum pressure of three (3) psig. A conspicuous tag will be placed in nitrogen system
compartment specifying the actual nitrogen pressure and the ambient temperature at the
time of filling.
MATERIAL SPECIFICATION
EUGENE WATER & ELECTRIC BOARD - EUGENE, OREGON
AUGUST 14, 2015
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ATTACHMENT F MATERIAL SPECIFICATION FOR TRANSFORMER #2
Major transformer components shall be removed for shipment including but not limited
to; high voltage bushings, radiators and lightning arrester supports. Metal components
i.e. radiators and lightning arrestor supports shall be metal stamped on the component and
the transformer to identify the location and orientation of the components.
The Supplier will be responsible for checking the shipping dimensions, clearances and
weight for shipment to the specified destination together with acquiring any and all
required permits.
The Supplier will furnish and install not less than two (2) 3-way impact recorders before
shipment of the transformer. The recorders will be mounted on the transformer tank wall
near the top on opposite tank walls. Prior to the transformer leaving the factory, the
impact recorders shall be started and verified that they are working properly. The impact
recorders are to remain on the transformer until both the Supplier’s representative and
EWEB’s representative are present to witness their removal together with the review of
the data. Tracking information for impact recorders (if applicable) shall be sent to
EWEB prior to the start of transit.
Acceptable limits of impact and ranges of impact requiring additional inspection or
testing shall be furnished to EWEB not less than 30 calendar days prior to delivery.
8.0
BIDDER INFORMATION
8.1
Installation Engineer
The services of a competent engineer specializing in installation work may be required to
inspect the complete installation and be responsible for the proper installation and
operation of the transformer, and for any tests that may be necessary. Bidders shall state
the total costs of travel expense, services and expenses of the engineer while working at
the installation site and all other costs EWEB will be expected to pay, in the bid form.
Personnel whose primary duties are sales will not be acceptable.
8.2
Drawings and Instruction Books
All prints, instruction books, etc., shall be sent to the Buyer’s attention, Eugene Water &
Electric Board, Purchasing Office, 4200 Roosevelt Boulevard, Eugene, Oregon 97402.
Drawing approval before construction is required. The manufacturer shall furnish
drawings for approval in AutoCAD and PDF format through a secure FTP site or
CD/DVD. These drawings shall include a general outline drawing, nameplate, wiring
schematics and connection diagrams and list of equipment and accessories by style
MATERIAL SPECIFICATION
EUGENE WATER & ELECTRIC BOARD - EUGENE, OREGON
AUGUST 14, 2015
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ATTACHMENT F MATERIAL SPECIFICATION FOR TRANSFORMER #2
number. The outline drawings shall include anchoring details of the tank base together
with dimensions, weights, center of gravity, insulating fluid volume and weights and
foundation loadings. The drawings shall also include foundation reactions produced by
equipment operation and by wind and seismic forces. The approval drawings must be
received at EWEB no later than eight (8) weeks after receipt of order by manufacturer.
The manufacturer shall supply at least thirty (30) days before shipment of the
transformer, four (4) sets of final prints of all drawings and four (4) sets of instruction
books. One (1) complete instruction book and set of drawings shall accompany
transformers. One CD/DVD shall be included additionally with all the below
documentation included in PDF or Microsoft Office Suite format. The final documents
shall include, but not be limited to, the following:
1) Assembled transformer outline drawing (including bushing locations and
connection points, centerline location and sizes of all control cabinet conduit
plates; structural details of transformer base; center of gravity of installed unit and
of unit prepared for shipment; and minimum dimensions and weight of unit
prepared for shipment).
2) Nameplate drawing (including identification of type of winding connection and
conductor material used in each winding).
3) Bushings outline drawings.
4) Surge arrester outline drawings.
5) Terminal fitting drawings.
6) Schematic and wiring diagrams showing number, size, and power requirements of
fans and pumps; fan and pump control; alarm and relay connections; and current
transformer connections.
7) Complete point-to-point wiring drawings shall be supplied for all electrical
circuits installed on the transformer by the manufacturer.
8) Instruction manual covering receiving, handling, installation, operation and
maintenance of transformer and all auxiliary equipment.
a) Complete instruction and date for ordering of all parts and accessories.
MATERIAL SPECIFICATION
EUGENE WATER & ELECTRIC BOARD - EUGENE, OREGON
AUGUST 14, 2015
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ATTACHMENT F MATERIAL SPECIFICATION FOR TRANSFORMER #2
b) Complete instructions covering installation, assembly, operation, maintenance
and adjustment of the transformer and all associated equipment. Cuts or
drawings or descriptive information shall be provided showing all points
where adjustment may be made.
c) Complete instructions for maintenance of bushings, including any special
instruction required for disassembly and assembly of the bushing or its parts.
d) Complete parts list, including a breakdown of all assemblies, including name
or included drawings.
e) Spare parts list as recommended by the manufacturer, including the
information listed in the preceding paragraph.
f) A list of the special tools, if applicable, being provided by the manufacturer.
9)
8.3
Certified test reports (for each transformer) including all tests performed on the
transformer, weather requested by EWEB or not.
Schematic and Wiring Diagram Specifications
The manufacturer shall provide diagrams showing the complete control cabinet and
terminal box wiring including: (1) EWEB connection points, (2) the number, size, and
power requirements of fans and pumps, (3) the fan and pump control, (4) the alarm and
relay connections, (5) the current transformer connections, and (6) the load tap changing
equipment control.
Wiring diagrams shall be physically representative of the arrangement of equipment and
of the format shown below in Figure 1. Wiring tables/lists are not acceptable.
MATERIAL SPECIFICATION
EUGENE WATER & ELECTRIC BOARD - EUGENE, OREGON
AUGUST 14, 2015
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ATTACHMENT F MATERIAL SPECIFICATION FOR TRANSFORMER #2
An electronic copy of all final drawings shall be furnished at or before delivery of
equipment. These files shall be compatible with EWEB’s latest AutoCAD standard,
which EWEB will send to the successful Bidder.
In addition to the two dimensional drawings EWEB requests an electronic three
dimensional model (3D) of transformer be provided. This model should also be provided
in a format that is compatible with the latest version of AutoCAD. The model is not held
to the same drafting standards requirements as the working drawings mentioned above.
If 3D is not available, the drawings should contain sufficient information that a 3D model
can be created from the drawings. For example there should be views from all sides
including the top and bottom. The drawings should be fully dimensioned
8.4
Current Transformer Information
The manufacturer shall provide the following: (1) current transformer resistance per
winding turn, (2) resistance of each lead, (3) curves showing ratio correction and
secondary excitation for relaying, and (4) ratio and phase angle correction for metering.
8.5
Correspondence
Correspondence regarding this document, and technical questions regarding this material
specification, or notice of any other technical matters which arise during the proposal
process shall be directed to the Purchasing Office, Eugene Water & Electric Board.
MATERIAL SPECIFICATION
EUGENE WATER & ELECTRIC BOARD - EUGENE, OREGON
AUGUST 14, 2015
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ATTACHMENT F MATERIAL SPECIFICATION FOR TRANSFORMER #2
The successful bidder will be provided contact information for EWEB Engineering and
the bidder will correspond directly with Engineering during the equipment design,
manufacture, testing and delivery phases.
MATERIAL SPECIFICATION
EUGENE WATER & ELECTRIC BOARD - EUGENE, OREGON
AUGUST 14, 2015
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SPECIFIC INFORMATION REQUIRED WITH QUOTATION
(Submit Separate Sheets for Each Bid Item)
Bidder shall submit the following complete descriptive information and performance
specifications on this form with his proposal.
1.
Losses
All transformer losses listed below will be for transformer in the 117.875kV tap position. All
quoted below shall include any auxiliary losses.
a.
No Load Losses at rated voltage
__________watts
b.
No Load Losses at 105% rated voltage
__________watts
c.
No Load Losses at 110% rated voltage
__________watts
d.
Load Losses at 15MVA and rated voltage
__________watts
e.
Load Losses at 25MVA and rated voltage
__________watts
The No-Load loss values to be used in the equation in Section 5 of this specification shall be
determined by averaging the three (3) no-load loss values stated above.
The load loss values to be used in the equation in Section 5 of this specification shall be
determined by averaging the two load loss values stated above.
2.
Excitation Current
All the excitation currents listed below will be for the transformer in the 117.875kV tap position.
a.
Excitation Current at rated voltage:
H1__________mA
H2__________mA
H3__________mA
b.
Excitation current at 105% of rated voltage:
H1__________mA
H2__________mA
H3__________mA
MATERIAL SPECIFICATION
EUGENE WATER & ELECTRIC BOARD - EUGENE, OREGON
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c.
Excitation current at 110% of rated voltage:
H1__________mA
H2__________mA
H3__________mA
3.
Sound Levels
All sound levels quoted and the sound level tests shall be for the transformer in the 117.875kV
tap.
a.
Calculated sound level at base MVA
__________db
b.
Calculated sound level at maximum MVA
__________db
c.
Guaranteed sound level at base MVA
__________db
d.
Guaranteed sound level at maximum MVA
__________db
Sound levels shall be based on the guaranteed sound level at the two (2) MVA levels listed
above. This credit will be reflected in the total evaluation as determined in Section 5 of this
specification.
4.
Impedances
a.
5.
H to X (117.875kV to 11.5 kV) at 15MVA
__________%
Outline Dimensions
a.
Overall height
__________inches
b.
Height of tank
__________inches
c.
Bushing removal
__________inches
d.
Phase spacing high voltage
__________inches
e.
Phase spacing low voltage
__________inches
f.
Length of transformer
__________inches
g.
Width of transformer
__________inches
MATERIAL SPECIFICATION
EUGENE WATER & ELECTRIC BOARD - EUGENE, OREGON
AUGUST 14, 2015
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6.
7.
8.
Weights
a.
Fully assembled transformer
__________pounds
b.
Tank with cover & coils (shipping weight)
__________pounds
a.
Capacity
__________gallons
b.
Weight
__________pounds
a.
High Voltage Type
__________________
b.
Manufacturer
__________________
c.
Catalog Number
__________________
d.
Current Rating
__________A
e.
Bushing-stud size-diameter
__________inches
thread
__________per inch
f.
Low Voltage Type
__________________
g.
Manufacturer
__________________
h.
Catalog Number
__________________
i.
Current Rating
__________A
j.
Bushing-stud size-diameter
__________inches
thread
__________per inch
Oil
Bushings
9.
Oil Preservation System
10.
Type of Cooling
a.
b.
__________________
Cooling each stage
Power Required
-Stage 1
__________
-Stage 2
__________
-Stage 1
__________
-Stage 2
__________
MATERIAL SPECIFICATION
EUGENE WATER & ELECTRIC BOARD - EUGENE, OREGON
AUGUST 14, 2015
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11.
12.
Arresters
a.
High Voltage Type
__________________
b.
Manufacturer
__________________
c.
Catalog Number
__________________
d.
Maximum spark over voltages
Front of wave
__________kV
1.5 x 50 wave
__________kV
Switching surge
__________kV
IR Drop at 10,000 amp
__________kV
IR Drop at 20,000 amp
__________kV
Maximum continuous operating voltage
__________kV
e.
Low-Voltage Type
__________________
f.
Manufacturer
__________________
g.
Catalog Number
__________________
h.
Maximum spark over voltages
Front of wave
__________kV
1.2 x 50 wave
__________kV
Switching surge
__________kV
IR Drop at 10,000
__________kV
IR Drop at 20,000
__________kV
Maximum continuous operating voltage
__________kV
Removed
MATERIAL SPECIFICATION
EUGENE WATER & ELECTRIC BOARD - EUGENE, OREGON
AUGUST 14, 2015
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13.
14.
No-Load Tap Changer (NLTC)
a.
NLTC Manufacturer
__________________
b.
NLTC Catalog Number
__________________
c.
Current rating of NLTC
__________A
d.
Short-circuit current rating of NLTC
__________kA
e.
BIL rating
__________kV
f.
Peak Current Withstand
__________A
g.
Peak Current Duration
__________seconds
Typical outline drawing(s).
Information provided on proposal page number(s).
15.
__________________
List of recommended spare parts.
Information provided on proposal page number(s).
16.
__________________
List of short circuit tests to show compliance with ANSI C57.12.90.
Information provided on proposal page number(s).
__________________
17.
Average number of years the manufacturer’s engineers have been electrical transformer
engineers.
18.
Average number of years the manufacturer’s mechanical engineers have been mechanical
engineers.
19.
Average number of years the manufacturer’s winders have been power transformer winders.
MATERIAL SPECIFICATION
EUGENE WATER & ELECTRIC BOARD - EUGENE, OREGON
AUGUST 14, 2015
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