Download Power Transformer 115kV/12.47kV

ATTACHMENT E MATERIAL SPECIFICATION FOR TRANSFORMER #1
1.0
SCOPE
This material specification covers oil-immersed 12/16/20 and 20/27/33 MVA 3Ø, 117.875-12.47
kV, two winding, LTC power transformers in accordance with the following descriptive
specifications.
2.0
NATIONAL STANDARDS
The power 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:
1.
12/16/20 MVA and 117.875-12.47 kV or
2.
20/27/33 MVA and 117.875-12.47 kV.
The transformer shall be rated on ONAN/ONAF/ONAF or ONAN/ONAF/OFAF basis.
The windings shall be connected Delta on the 117.875 kV high side and Wye on the
12.47 kV low side for use on a grounded Wye system. The angular displacements
between the high voltage and low voltage windings shall be 30° lagging as shown below.
The polarity of the transformer shall be subtractive.
Basic Impulse Level: The 117.875 kV high voltage winding shall have a BIL withstand
rating of 450 kV. The 12.47 low-voltage winding including the neutral shall have a BIL
withstand rating of 110 kV.
MATERIAL SPECIFICATION
EUGENE WATER & ELECTRIC BOARD - EUGENE, OREGON
August 14, 2015
POWER TRANSFORMER 115 kV / 12.47 kV
ES3-9.130
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ATTACHMENT E MATERIAL SPECIFICATION FOR TRANSFORMER #1
3.2
3.3
Transformer Impedance
The impedance H to X shall be:
1.
6.0% on a 12 MVA base for 12/16/20 MVA transformers,
2.
10.0% on a 20 MVA base for 20/27/33 MVA transformers.
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 highdensity 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 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, low voltage, and regulator windings, shall be equal from the top to the bottom of
the winding. 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
MATERIAL SPECIFICATION
EUGENE WATER & ELECTRIC BOARD - EUGENE, OREGON
August 14, 2015
POWER TRANSFORMER 115 kV / 12.47 kV
ES3-9.130
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ATTACHMENT E MATERIAL SPECIFICATION FOR TRANSFORMER #1
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
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.
MATERIAL SPECIFICATION
EUGENE WATER & ELECTRIC BOARD - EUGENE, OREGON
August 14, 2015
POWER TRANSFORMER 115 kV / 12.47 kV
ES3-9.130
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ATTACHMENT E MATERIAL SPECIFICATION FOR TRANSFORMER #1
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
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 photographs 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 5
kV, 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
POWER TRANSFORMER 115 kV / 12.47 kV
ES3-9.130
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ATTACHMENT E MATERIAL SPECIFICATION FOR TRANSFORMER #1
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 mail 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
transformer shall be completely assembled during this test including all radiators, fans,
MATERIAL SPECIFICATION
EUGENE WATER & ELECTRIC BOARD - EUGENE, OREGON
August 14, 2015
POWER TRANSFORMER 115 kV / 12.47 kV
ES3-9.130
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ATTACHMENT E MATERIAL SPECIFICATION FOR TRANSFORMER #1
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 shall be fitted with a Qualitrol 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.
3.9
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. Bushing shall be a fiberglass tube construction with flexible
silicon rubber sheds or similar material that is hydrophobic, resists 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 550 kV BIL rating and a minimum creepage based on the latest revision of
IEEE C57.19.100, “Medium” contamination level, at the nominal voltage.
Three (3) LV phase bushings and one (1) LV neutral bushing shall be located on the
transformer cover in ANSI Segment 1.
The low-voltage and neutral bushings shall have a minimum current rating of 2,000
amperes and shall be bottom-connected. The low voltage bushings must have a 150 kV
BIL rating. Bushings are to be Pcore catalog number 89123-70 or EWEB approved
equal.
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. Provide a NEMA standard four (4) hole stud connector on each
bushing with appropriate current rating for bushing capacity.
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
the bushing or the transformer, regardless of the angle at which the stream of water
impinges on the bushing or the associated mounting.
MATERIAL SPECIFICATION
EUGENE WATER & ELECTRIC BOARD - EUGENE, OREGON
August 14, 2015
POWER TRANSFORMER 115 kV / 12.47 kV
ES3-9.130
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ATTACHMENT E MATERIAL SPECIFICATION FOR TRANSFORMER #1
3.10
Parallel Operation
The transformer shall be capable of being operated in parallel with a similar unit by use
of the circulating current method. This requirement shall be met with the use of the
Reinhausen Tapcon 250 tap changer control specified in paragraph 3.14. EWEB reserves
the right to require paralleling information at any time.
3.11
De-Energized Tap Changer (DETC)
A DETC shall NOT be required.
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 the three (3) high-voltage arresters rated 96 kV and three
(3) low-voltage arresters rated 9 kV.
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
bushing. 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
bolt circle 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 4/0-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 bar 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 in each of the 115 kV and 12.47 kV bushing wells.
The transformers shall be supplied with the bushing type current transformers specified
below:
MATERIAL SPECIFICATION
EUGENE WATER & ELECTRIC BOARD - EUGENE, OREGON
August 14, 2015
POWER TRANSFORMER 115 kV / 12.47 kV
ES3-9.130
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ATTACHMENT E MATERIAL SPECIFICATION FOR TRANSFORMER #1
Terminals
Full-Winding
Amperes
Relay Accuracy
Rating
Factor
H1, H2, H3
600
C400
2.0
H1, H2, H3
X1, X2, X3
X1, X2, X3
X0
600
N/A
N/A
1200
C400
N/A
N/A
C400
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
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
Load Tap Changer
The transformers shall be supplied with a three-phase automatic-manual load tap changer
designed to regulate the 12.47 kV winding plus and minus 10% of the rated voltage in
thirty-two 5/8% steps.
The transformer shall be capable of supplying ONAF or OFAF kVA rating when the load
tap changer is on any position at, below, or above rated secondary voltage. The tap
changer shall be of vacuum-diverter reactive design. The Bidder shall list in the Proposal
section, the type and electrical rating of the tap changing equipment the Bidder will
provide.
Approved LTC mechanisms are the Reinhausen Type RMV-II.
If a booster transformer is required to reduce the current level to the LTC, the booster
transformer shall be of the same design and construction as the main core-and-coil
assembly, including short-circuit withstand capability. Preference shall be given to
designs that do not include a booster transformer.
Each tap of the regulating winding shall be fully distributed over the entire coil height
and wound such that the amp-turn per height ratio of the high-voltage winding, the lowvoltage winding and each tap of the regulating winding are equal.
All arcing contacts of the tap changer shall be in a separate compartment. The
compartment shall be oil-filled with a liquid-level gauge and a sudden-pressure relay and
MATERIAL SPECIFICATION
EUGENE WATER & ELECTRIC BOARD - EUGENE, OREGON
August 14, 2015
POWER TRANSFORMER 115 kV / 12.47 kV
ES3-9.130
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ATTACHMENT E MATERIAL SPECIFICATION FOR TRANSFORMER #1
the associated seal-in relay located in the control cabinet with a contact that closes if
there is an unusual pressure rise within the load tap changer compartment. In addition,
the tap changer compartment, together with the barrier between the LTC compartment
and the main tank shall be able to withstand a full vacuum while the main tank is at
atmospheric pressure.
The tap changer shall have a direct-driven position indicator, with electrically resettable
drag hands. The position indicator shall be easily read from the ground without opening
any doors. Any control cabinets required for the LTC shall meet the requirements of
paragraph 3.19 of this specification as applicable.
The tap changing compartment shall be supplied with a Qualitrol 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.
The Reinhausen Tapcon 250 load tap changer control together with the separate “First
House Voltage Protector,” a Beckwith M-0329B, shall be mounted in the control cabinet.
The load tap changer control shall be complete with the TC250-80 Adaptor Panel and
meet all of the following operational requirements:
1.
Paralleling equipment shall be of the circulating-current type, selectable
with a selector switch.
2.
The LTC control shall be furnished with the following:
A.
Remote / Local Selector Switch
B.
Auto / Manual Selector Switch
C.
Raise / Off / Lower Momentary Switch
D.
Paralleled / Independent Selector Switch
E.
Voltage Source Internal / External Selector Switch
F.
Voltage Test Terminals
G.
Test Terminals for energizing the control circuits from an external
source with a disconnecting device for de-energizing the LTC
controls. The disconnecting devices shall open the control circuit
from the potential sources and short/isolate the internal current
transformers from the control circuit.
MATERIAL SPECIFICATION
EUGENE WATER & ELECTRIC BOARD - EUGENE, OREGON
August 14, 2015
POWER TRANSFORMER 115 kV / 12.47 kV
ES3-9.130
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ATTACHMENT E MATERIAL SPECIFICATION FOR TRANSFORMER #1
H.
3.
Customer usable contact wired to terminal blocks for remote
indication of auto/manual status of LTC controller.
Terminal blocks shall be provided in the control cabinet for connecting
EWEB SCADA contacts as listed below:
A.
SUP/M
B.
SUP/A
C.
SUP/Raise
D.
SUP/Lower
4.
LTC control shall be wired according to EWEB standard drawing, ED35.2001
5.
The manufacturer shall provide a 4-20mA output for LTC tap position
indication. A separate contact output shall indicate “on-tap/off-tap”
position. All contacts shall be wired to a suitable terminal block in the
control cabinet for connection to EWEB’s SCADA system.
6.
The current transformer (CT) for the line drop compensator shall be located
on bushing X1. Line drop compensator auxiliary CT’s shall be rated
5/0.2A. The current transformers specified herein are not included in
Section 3.13.
7.
An isolating transformer with ratio 1:1 shall be furnished in the 120V LTC
control potential input circuit. EWEB will furnish the necessary 7200/120V
line to neutral or 12470/124.7V line-to-line potential transformer for LTC
control.
8.
Overload protection and disconnecting devices for tap changer drive motor
circuits and line drop compensator circuits shall be provided.
9.
A hand crank mechanism shall be provided to manually operate the tap
changer, interlocked with the electrical system so that when the manual
handle is used, the motor is disconnected from its source. The interlock
must show a visible break in the motor circuit.
10.
The current and potential circuit for the load tap changer control shall be
electrically isolated from the 120/240V, single-phase, auxiliary power
source.
MATERIAL SPECIFICATION
EUGENE WATER & ELECTRIC BOARD - EUGENE, OREGON
August 14, 2015
POWER TRANSFORMER 115 kV / 12.47 kV
ES3-9.130
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ATTACHMENT E MATERIAL SPECIFICATION FOR TRANSFORMER #1
11.
The load tap changing drive motor and all necessary control relays shall be
capable of operating from a 120/240V, single-phase, 60 Hz three-wire
source.
12.
Vacuum bottle interrupters shall include complete integrity controls.
13.
Over current blocking controls to protect the tap changer from operating
when load current is beyond the tap changers rating.
14.
The LTC controller shall be furnished with a serial communications port
and a multi-mode fiber optic port.
15.
The LTC control shall support the DNP3 protocol.
16.
Furnish and install the following LTC control accessories:
17.
3.15
A.
Tap changer operation counter
B.
Neutral indicating light on the control panel
The tap changer compartment shall be equipped with the following
accessories:
A.
Internal motor power supply and terminals for external motor power
supply.
B.
Oil drain valve, sampling device and filter press connections.
C.
The load tap changer compartment breather will be equipped with
maintenance-free silica gel breather. The maintenance-free breather
will contain 600 grams of silica gel desiccant that is automatically
dried once every two weeks. The auto-recharging dehydrating
breather system shall be a Waukesha Electric type ARDB.
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 120/240Vsingle-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.
MATERIAL SPECIFICATION
EUGENE WATER & ELECTRIC BOARD - EUGENE, OREGON
August 14, 2015
POWER TRANSFORMER 115 kV / 12.47 kV
ES3-9.130
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ATTACHMENT E MATERIAL SPECIFICATION FOR TRANSFORMER #1
3.16
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 heating using FR3 and provide this
model/calculations upon request.
The transformer shall be capable of being loaded continuously to:
1. 12,000 kVA self-cooled and 20,000 kVA with two stages of forced cooling
2. 20,000 kVA self-cooled and 33,000 kVA 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.
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 temperatureindicating 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 transformer control 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.
MATERIAL SPECIFICATION
EUGENE WATER & ELECTRIC BOARD - EUGENE, OREGON
August 14, 2015
POWER TRANSFORMER 115 kV / 12.47 kV
ES3-9.130
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ATTACHMENT E MATERIAL SPECIFICATION FOR TRANSFORMER #1

Winding relay shall be set at 75°C (Stage 1 cooling), 80°C (Stage 2
cooling), 110° (alarms) 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 (8) 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 when pumps should be running. 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.
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 lowspeed 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.
MATERIAL SPECIFICATION
EUGENE WATER & ELECTRIC BOARD - EUGENE, OREGON
August 14, 2015
POWER TRANSFORMER 115 kV / 12.47 kV
ES3-9.130
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ATTACHMENT E MATERIAL SPECIFICATION FOR TRANSFORMER #1
3.17
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 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 the 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.
An auxiliary relay shall be furnished to provide alarm indication for loss of
power to the cooling equipment with a 30-second time delay to avoid
alarming for momentary loss of power.
9.
Cooling control relays shall remove electrical power from the “high” side of
the cooling equipment loads. The manufacturer shall also furnish all
necessary wiring, labeling and terminations between the cooling equipment
and equipment in the control cabinet (paragraph 3.19).
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 3.16 point #2. The manual control
switch shall have OFF, AUTO, and MANUAL settings independent for
each stage of fans; 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
continuously. The transformer monitor shall be connected to the fan control
circuits as shown in the EWEB standard drawing but shall be programmed
by EWEB.
Oil
The transformer tank 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.
MATERIAL SPECIFICATION
EUGENE WATER & ELECTRIC BOARD - EUGENE, OREGON
August 14, 2015
POWER TRANSFORMER 115 kV / 12.47 kV
ES3-9.130
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ATTACHMENT E MATERIAL SPECIFICATION FOR TRANSFORMER #1
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.
The LTC tank will be supplied and filled with new mineral oil inhibited against oxidation
prior to shipping with 0.3 percent by weight of DBPC. Residual oil shall be shipped in
50 gallon barrels.
All the mineral oil supplied to properly fill the transformer shall not be contaminated with
other substances and the manufacturer shall certify that the oil contains less than one (1)
ppm of polychlorinated biphenyls (PCBs). In addition, the manufacturer shall state on
the nameplate, “The transformer contains less than 1 ppm of PCBs.”
The mineral oil supplied with the transformer shall be in accordance with ASTM D3487
“Standard Specification for Mineral Insulating Oil Used in Electrical Apparatus.”
If the transformer is shipped with dry air or nitrogen, the oil shall be delivered on date
and time, as specified by EWEB.
3.18
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 200 cubic
ft gas cylinder installed in a stainless steel cabinet mounted on the
transformer tank with the bottom of the enclosure not more than 2” above
the bottom of the transformer base; a three stage pressure regulating system;
and a pressure-vacuum 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
MATERIAL SPECIFICATION
EUGENE WATER & ELECTRIC BOARD - EUGENE, OREGON
August 14, 2015
POWER TRANSFORMER 115 kV / 12.47 kV
ES3-9.130
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ATTACHMENT E MATERIAL SPECIFICATION FOR TRANSFORMER #1
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-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.
3.19
Control Cabinet
1.
The control cabinet shall be a stainless steel NEMA 4 enclosure. Doors
shall be gasketed, continuous hinge with a 3-point door latch operated by a
single handle. Interior swing panels shall be included to accommodate
panel mount equipment and provide access to back panel wiring and
MATERIAL SPECIFICATION
EUGENE WATER & ELECTRIC BOARD - EUGENE, OREGON
August 14, 2015
POWER TRANSFORMER 115 kV / 12.47 kV
ES3-9.130
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ATTACHMENT E MATERIAL SPECIFICATION FOR TRANSFORMER #1
equipment. The cabinet shall be furnished with cooling equipment control
devices, LTC equipment control devices, customer specified transformer
monitor, and terminal blocks for terminating all auxiliary wiring and shall
be mounted on Segment 1 wall of the transformer tank. The cabinet 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 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 RGS 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..
MATERIAL SPECIFICATION
EUGENE WATER & ELECTRIC BOARD - EUGENE, OREGON
August 14, 2015
POWER TRANSFORMER 115 kV / 12.47 kV
ES3-9.130
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ATTACHMENT E MATERIAL SPECIFICATION FOR TRANSFORMER #1
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 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 uninsulated ring type terminal connectors. Each CT shall be individually
grounded inside the control cabinet.
10.
Adequate space shall 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 one terminal screw.
The manufacturer shall provide an additional ten percent (10%) of spare
terminals. A 10-inch high by 10-inch wide by 8.5-inch deep space shall be
reserved on the backplane of the control cabinet for future equipment to be
installed 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.
MATERIAL SPECIFICATION
EUGENE WATER & ELECTRIC BOARD - EUGENE, OREGON
August 14, 2015
POWER TRANSFORMER 115 kV / 12.47 kV
ES3-9.130
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ATTACHMENT E MATERIAL SPECIFICATION FOR TRANSFORMER #1
3.20
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.
15.
The control cabinet shall include swing out panels that house the technician
interface equipment. Equipment includes the following: LTC controller,
LTC adaptor panel, and LTC indicating lights 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.
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 one 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 3.16, #2 for temperature set points)
MATERIAL SPECIFICATION
EUGENE WATER & ELECTRIC BOARD - EUGENE, OREGON
August 14, 2015
POWER TRANSFORMER 115 kV / 12.47 kV
ES3-9.130
PAGE 19 OF 40
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ATTACHMENT E MATERIAL SPECIFICATION FOR TRANSFORMER #1
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.
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).
MATERIAL SPECIFICATION
EUGENE WATER & ELECTRIC BOARD - EUGENE, OREGON
August 14, 2015
POWER TRANSFORMER 115 kV / 12.47 kV
ES3-9.130
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ATTACHMENT E MATERIAL SPECIFICATION FOR TRANSFORMER #1
3.21
16.
One (1) or more hand-holes or manholes in the cover.
17.
Cover-mounted mechanical pressure relief device with automatic resealingresetting 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 Redial Device).
18.
Solid metal diagrammatic nameplate with embossed data in U.S. Customary
units.
19.
Removed.
20.
An 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
3.27) this device will receive; signals from all resistance temperature
detectors 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.
21.
The transformer shall be equipped with base plate(s) for fall protection
system Uni-Hoist 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.
Provision for Future Installation of a Hydran
Two (2) 1-1/2” 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 the future
installation of a Hydran.
The output end of the valve shall not be more than 1-1/2” from the oil flow.
MATERIAL SPECIFICATION
EUGENE WATER & ELECTRIC BOARD - EUGENE, OREGON
August 14, 2015
POWER TRANSFORMER 115 kV / 12.47 kV
ES3-9.130
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ATTACHMENT E MATERIAL SPECIFICATION FOR TRANSFORMER #1
A threaded cap 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).
3.22
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 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.
3.23
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 Finishing 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.
MATERIAL SPECIFICATION
EUGENE WATER & ELECTRIC BOARD - EUGENE, OREGON
August 14, 2015
POWER TRANSFORMER 115 kV / 12.47 kV
ES3-9.130
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ATTACHMENT E MATERIAL SPECIFICATION FOR TRANSFORMER #1
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.
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.
3.24
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.
Wind Loading & Seismic
MATERIAL SPECIFICATION
EUGENE WATER & ELECTRIC BOARD - EUGENE, OREGON
August 14, 2015
POWER TRANSFORMER 115 kV / 12.47 kV
ES3-9.130
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ATTACHMENT E MATERIAL SPECIFICATION FOR TRANSFORMER #1
Wind Loading Strength: The transformer shall be designed to withstand wind loads as
defined by local building code, or 95 miles/hour, whichever is greater, 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.
Earthquake Strength: The completely assembled transformers shall meet the HIGH
seismic qualification level as published in IEEE Standard 693 without damage. Dynamic
testing or dynamic analysis results shall be provided with final drawings per paragraph
8.2.
3.25
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
POWER TRANSFORMER 115 kV / 12.47 kV
ES3-9.130
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ATTACHMENT E MATERIAL SPECIFICATION FOR TRANSFORMER #1
3.26
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.
3.27
Reference Drawing(s)
The following reference drawing(s) are included as a part of this specification.
Drawing Number
ED3-4.2100
ED3-5.2001
EC3-6.0501
4.0
Title
SEL-2414 Transformer Monitoring Schematic & Wiring
Auto/Manual LTC Control Schematic
Power Transformer Grounding
ELECTRICAL TESTS
The transformer shall be filled with in-service insulating fluid (FR3 in main tank and
mineral oil in LTC tank) for all electrical tests.
Transformer will receive all routing and optional test in accordance with ANSI
C57.12.90, C57.12.10, C57.15, and C57.90 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 at base load (12 MVA
or 20 MVA) at the neutral tap position, maximum boost position, and the
position adjacent to the maximum boost position plus the maximum buck
position and the position adjacent to the maximum block buck position.
Load loss tests shall also include tests at rated current (20 MVA or 33
MVA) and at rated voltage, for DETC position 1 and DETC position 5 at
the neutral tap position, maximum boost position, and the position adjacent
MATERIAL SPECIFICATION
EUGENE WATER & ELECTRIC BOARD - EUGENE, OREGON
August 14, 2015
POWER TRANSFORMER 115 kV / 12.47 kV
ES3-9.130
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ATTACHMENT E MATERIAL SPECIFICATION FOR TRANSFORMER #1
to the maximum boost position, plus the maximum buck position and the
position adjacent to the maximum buck position.
4.
H-winding to X-winding position sequence impedance shall be measured at
nominal rated voltage.
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 forcedcooled 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)
MATERIAL SPECIFICATION
EUGENE WATER & ELECTRIC BOARD - EUGENE, OREGON
August 14, 2015
POWER TRANSFORMER 115 kV / 12.47 kV
ES3-9.130
PAGE 26 OF 40
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ATTACHMENT E MATERIAL SPECIFICATION FOR TRANSFORMER #1
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 each high voltage terminal, an excitation current
test shall be performed at 10 kV on each de-energized 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 182 kV rms phase-to-phase and
an enhancement voltage level of 208 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 5-minute 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 and the LTC in either
the 15 raise or lower position.
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
MATERIAL SPECIFICATION
EUGENE WATER & ELECTRIC BOARD - EUGENE, OREGON
August 14, 2015
POWER TRANSFORMER 115 kV / 12.47 kV
ES3-9.130
PAGE 27 OF 40
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ATTACHMENT E MATERIAL SPECIFICATION FOR TRANSFORMER #1
applied for impulse and switching surge tests, if specified, and for 7200cycle induced tests.
5.0
18.
Insulation resistance shall be measured at 10 kV DC. 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).
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.
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 pressure-tested 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 of the abovereferenced 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.
BID EVALUATION
MATERIAL SPECIFICATION
EUGENE WATER & ELECTRIC BOARD - EUGENE, OREGON
August 14, 2015
POWER TRANSFORMER 115 kV / 12.47 kV
ES3-9.130
PAGE 28 OF 40
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ATTACHMENT E MATERIAL SPECIFICATION FOR TRANSFORMER #1
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
Sound Costs = (C – NEMA Sound Level at Transformer Base Rating + D – NEMA
Sound Level at Transformer Maximum Rating) * $5000.00/db
C = Guaranteed Sound Level at base MVA
D = Guaranteed Sound Level at maximum MVA
Acceptable Sound Levels per NEMA TR 1-2013:
20MVA transformer at 12 MVA = 71db
20MVA transformer at 20MVA = 74db
33MVA transformer at 20 MVA = 73db
33MVA transformer at 33 MVA = 76db
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 exception(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 manufacturing, effectiveness and experience of their testing department,
and how the manufacturer has incorporated technology into the manufacturing process.
MATERIAL SPECIFICATION
EUGENE WATER & ELECTRIC BOARD - EUGENE, OREGON
August 14, 2015
POWER TRANSFORMER 115 kV / 12.47 kV
ES3-9.130
PAGE 29 OF 40
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ATTACHMENT E MATERIAL SPECIFICATION FOR TRANSFORMER #1
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.
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.
MATERIAL SPECIFICATION
EUGENE WATER & ELECTRIC BOARD - EUGENE, OREGON
August 14, 2015
POWER TRANSFORMER 115 kV / 12.47 kV
ES3-9.130
PAGE 30 OF 40
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ATTACHMENT E MATERIAL SPECIFICATION FOR TRANSFORMER #1
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.
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 manufacturer 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 manufacturer 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 manufacturer’s
representative and EWEB’s representative are present to witness their removal together
with the review of the data. Tracking information for impactor 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
Drawing and Instruction Books
MATERIAL SPECIFICATION
EUGENE WATER & ELECTRIC BOARD - EUGENE, OREGON
August 14, 2015
POWER TRANSFORMER 115 kV / 12.47 kV
ES3-9.130
PAGE 31 OF 40
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ATTACHMENT E MATERIAL SPECIFICATION FOR TRANSFORMER #1
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
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.
MATERIAL SPECIFICATION
EUGENE WATER & ELECTRIC BOARD - EUGENE, OREGON
August 14, 2015
POWER TRANSFORMER 115 kV / 12.47 kV
ES3-9.130
PAGE 32 OF 40
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ATTACHMENT E MATERIAL SPECIFICATION FOR TRANSFORMER #1
8.
9.
8.3
Instruction manual covering receiving, handling, installation, operation and
maintenance of transformer and all auxiliary equipment.
A.
Complete instructions and data for ordering of all parts and
accessories.
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.
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
POWER TRANSFORMER 115 kV / 12.47 kV
ES3-9.130
PAGE 33 OF 40
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ATTACHMENT E MATERIAL SPECIFICATION FOR TRANSFORMER #1
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.
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
POWER TRANSFORMER 115 kV / 12.47 kV
ES3-9.130
PAGE 34 OF 40
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ATTACHMENT E MATERIAL SPECIFICATION FOR TRANSFORMER #1
9.0
TAP CHANGER OPERATIONS
The manufacturer shall state the number of operations for which the load tap changer
contacts are guaranteed.
MATERIAL SPECIFICATION
EUGENE WATER & ELECTRIC BOARD - EUGENE, OREGON
August 14, 2015
POWER TRANSFORMER 115 kV / 12.47 kV
ES3-9.130
PAGE 35 OF 40
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ATTACHMENT E MATERIAL SPECIFICATION FOR TRANSFORMER #1
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 neutral
__________watts
b.
No Load Losses at 15R
__________watts
c.
No Load Losses at 16R
__________watts
d.
No Load Losses at 15L
__________watts
e.
No Load Losses at 16L
__________watts
f.
Load Losses at 12 or 20 MVA and neutral
__________watts
g.
Load Losses at 12 or 20 MVA and 15R
__________watts
h.
Load Losses at 12 or 20 MVA and 16R
__________watts
i.
Load Losses at 12 or 20 MVA and 15L
__________watts
j.
Load Losses at 12 or 20 MVA and 16L
__________watts
k.
Load Losses at 20 or 33 MVA and neutral
__________watts
l.
Load Losses at 20 or 33 MVA and 15R
__________watts
m.
Load Losses at 20 or 33 MVA and 16R
__________watts
n.
Load Losses at 20 or 33 MVA and 15L
__________watts
o.
Load Losses at 20 or 33 MVA and 16L
__________watts
The No-Load loss values to be used in the equation in Section 5 of this specification shall be
determined by averaging the five (5) 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 ten (10) load loss values stated above.
MATERIAL SPECIFICATION
EUGENE WATER & ELECTRIC BOARD - EUGENE, OREGON
August 14, 2015
POWER TRANSFORMER 115 kV / 12.47 kV
ES3-9.130
PAGE 36 OF 40
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ATTACHMENT E MATERIAL SPECIFICATION FOR TRANSFORMER #1
2.
Excitation Current
All the excitation currents listed below will be for the transformer DETC in the 117.875kV tap
and the LTC in the neutral 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
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 DETC in the
117.875kV tap and the LTC in 15 raise position.
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.
H to X at 12 or 20 MVA (circle transformer size)
__________%
MATERIAL SPECIFICATION
EUGENE WATER & ELECTRIC BOARD - EUGENE, OREGON
August 14, 2015
POWER TRANSFORMER 115 kV / 12.47 kV
ES3-9.130
PAGE 37 OF 40
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ATTACHMENT E MATERIAL SPECIFICATION FOR TRANSFORMER #1
5.
6.
7.
8.
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
Weights
a.
Fully assembled transformer
__________pounds
b.
Tank with cover & coils (shipping weight)
__________pounds
a.
Capacity
__________gallons
b.
Weight
__________pounds
Oil
Bushings
a.
High Voltage Type
__________________
b.
Manufacturer
__________________
c.
Catalog Number
__________________
d.
Current Rating
__________A
e.
Bushing-stud size-diameter
Threads
__________inches
__________per inch
f.
Low Voltage Type
__________________
g.
Manufacturer
__________________
h.
Catalog Number
__________________
i.
Current Rating
__________A
j.
Bushing-stud size-diameter
Threads
__________inches
__________per inch
MATERIAL SPECIFICATION
EUGENE WATER & ELECTRIC BOARD - EUGENE, OREGON
August 14, 2015
POWER TRANSFORMER 115 kV / 12.47 kV
ES3-9.130
PAGE 38 OF 40
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ATTACHMENT E MATERIAL SPECIFICATION FOR TRANSFORMER #1
9.
Oil Preservation System
__________________
10.
11.
Type of Cooling
a.
Cooling each stage
-Stage 1
-Stage 2
__________
__________
b.
Power Required
-Stage 1
-Stage 2
__________
__________
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
MATERIAL SPECIFICATION
EUGENE WATER & ELECTRIC BOARD - EUGENE, OREGON
August 14, 2015
POWER TRANSFORMER 115 kV / 12.47 kV
ES3-9.130
PAGE 39 OF 40
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ATTACHMENT E MATERIAL SPECIFICATION FOR TRANSFORMER #1
12.
13.
14.
Load Tap Changer (LTC)
a.
LTC Manufacturer
__________________
b.
LTC Catalog Number
__________________
c.
Rated switching current of LTC
__________A
d.
Rated step voltage of LTC
__________V
e.
Voltage ration of booster transformer, is used
__________
f.
Number of operations of LTC at full load before maintenance
__________
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
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
POWER TRANSFORMER 115 kV / 12.47 kV
ES3-9.130
PAGE 40 OF 40
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