Facilities Management Division
Bid Specifications
Loop Feed Switches and Pad Mount Transformers
The University of Georgia is soliciting qualified bids for the purchase of S&C Loop
Feed Switches and the following brands of Three-Phase, Loop Feed Pad Mount
Transformers with Mineral Oil: Square D, Cooper Power Systems, Ermco, or A.A.B.
This is a SOLE BRAND solicitation. No other brands and/or substitutions will be
accepted. The University of Georgia wishes to purchase the following items:
Item Description
S&C PME-9 Loop Feed Switch Volts 14,400 Amperes: 600 with
6-13.8-25 KV SME-20 Fuse Unit End Fittings with Silencers.
Six SME 200E Fuses (See Attached Sole-Brand Justification)
Quantity
4
1000 kVA 208/120 Pad Mount Transformer (See Attached Specs)
1
750 kVA 480/277 Pad Mount Transformer (See Attached Specs)
1
500 kVA 208/120 Pad Mount Transformer (See Attached Specs)
2
300 kVA 480/277 Pad Mount Transformer (See Attached Specs)
1
150 kVA 208/120 Pad Mount Transformer (See Attached Specs)
1
SPECIFICATIONS FOLLOW ON THE NEXT PAGES
1180 East Broad Street – 0201 Chicopee Complex • Athens, Georgia 30602 • Telephone (706) 542-7369
An Equal Opportunity/Affirmative Action Institution
Page |2
Specifications for Transformers
Part One – General
1.1.
Quality Assurance
A. Standards: Transformers shall conform to the latest amended edition of the
following standards effective as of the date of bid opening:
1. NFPA – 70, National Electrical Code
2. ANSI-C2, National Electrical Safety Code
3. ANSI/IEEE-C57.12.00, General Requirements for Transformers
4. ANSI-C57.12.34, IEEE Standard Requirements for Pad-Mounted
Compartmental-Type Self-Cooled, Three-Phase Distribution Transformers
(2500 kVA and smaller) – High-Voltage: 34,500 GRDY/19,920 Volts and
Below; Low-Voltage: 480 Volt, 2500 kVA and Smaller
5. ANSI-C57.28 – Pad-Mounted Equipment – Enclosure Integrity
6. ANSI-C57.12.70, Terminal Marking & Connections for Transformers
7. ANSI-C57.12.90, - IEEE Standard Test Code for Liquid-Immersed
Distribution, Power and Regulating Transformers, and IEE Guide for
Short Circuit Testing of Distribution and Power Transformers
8. ANSI-C62.11, Metal-Oxide Surge Arrestor for Alternating-Current Power
Circuits
9. NEMA LA1, Surge Arrester
10. Department of Energy (DOE) – 10 CFR Part 431 Energy Conservation
Program for Commercial Equipment: Distribution Energy Conservation
Standard; Final Rule Dated 10/12/2007
11. UL Listed and Labeled
B. Bid Documents
1. Bid documents shall clearly indicate the type of insulating fluid, kVA
rating, primary and secondary voltage, H1, H2, H3, H0 and X1, XX2, X3,
X0 winding configurations, IEEE standard impedance value and the
footprint dimensions including bottom openings for high side and low side
cable penetrations for each and every transformer specified herein. Bids
without the aforementioned data shall be invalid.
C. Testing
1. Routine tests on each transformer shall be made as specified in ANSI
Standard C57.12.00, latest revision. All testing procedures shall be in
accordance with ANSI Standard C57.12.90, latest revision
2. Certified test reports shall be provided by the manufacturer, for the unit
shipped, and shall be turned over to the Owner prior to final acceptance.
3. The certified test reports shall include the following data:
a. Percent impedance, corrected to 85 Degrees Celsius
b. Load loss, corrected to 85 Degrees Celsius
c. No load loss at 20 Degrees Celsius
d. Total loss, corrected to 85 Degrees Celsius
e. Percent excitation current at 100% voltage
f. High and low voltage ratings
The University of Georgia Facilities Management Division
1180 East Broad Street – 0201 Chicopee Complex • Athens, Georgia 30602 • Telephone (706) 542-7369
An Equal Opportunity/Affirmative Action Institution
Page |3
g. Date of test
h. Serial no. of units
i. kVA size
j. Location designation (S/T-8, etc.)
4. The unit shall be impulse tested per ANSI Standard C57.12.90, latest
revision, Section 10.4.
D. Acceptable Manufacturers:
1. Pad-Mount Transformers: SquareD, A.B.B., Cooper Power Systems, and
Ermco.
2. Primary Bushings: Cooper Power Systems, Elastimold
3. 15kV Loop-Feed Switch for the primary side: A.B.B., Cooper Power
Systems
4. Pressure-Relief/Air Bleed Device: Qualitrol, Beta, or approved equal which
meets or exceeds ANSI C57.12.34, Section 9.9.2
5. Top Mounted Pressure-Relief Device: Qualitrol #208-60 or approved
equal
6. Oil-Immersed Metal Oxide Distribution Arrester: General Electric
“Tranquell 1A1”, Cooper Power Systems Type AZU, or A.B.B.
7. Magnetic Overcurrent Indicators: Cooper Power Systems, TypeSTVT, or
approved equal
8. Secondary Spade Covers: W.H. Salisbury Co. #SC-4, Homac Mfg. Co. “SB”
Series, or approved equal
1.2 – Submittals
A. Submit data and drawings for review that indicates compliance with the above
specifications.
B. Two (2) complete sets of maintenance manuals shall be shipped with the
transformer(s)
1.3 – Product Handling, Storage, and Delivery
A. Supplier shall be responsible for safe delivery and handling. Obtain touch-up
kit(s) from the transformer manufacturer and repair all scuff marks, filing,
grinding, or sanding away all rust to scale to bare metal, and applying a
compatible primer first.
B. Transformer shall be shipped complete with oil and with operators and
accessories in place.
C. Store on skids or pavement
Part Two – Products
2.1 – Materials
A. Transformers shall be new, factory-tested, three-phase, pad-mount type,
liquid-filled, complete with accessories, and have olive, “grass,” or “telephone”
The University of Georgia Facilities Management Division
1180 East Broad Street – 0201 Chicopee Complex • Athens, Georgia 30602 • Telephone (706) 542-7369
An Equal Opportunity/Affirmative Action Institution
Page |4
green color finish. Compartment and tank shall have factory applied
undercoating.
B. A primary loop feed, loadbreak oil switch assembly, consisting of a 4-position
V blade switch with closed transition. The device shall be provided integrally
in the primary of each three-phase of the pad-mount transformer with the
switch handle accessible in the high voltage compartment.
C. Primary Fusing: A combination of an oil-immersed, current-limiting fuse and a
Bay-O-Net, oil-immersed, dual-element expulsion fuse, coordinated to provide
full range protection, with the expulsion fuse, clearing low-current faults or
overloads, and the current limiting fuse clearing high-current faults up to
50,000 amperes rms. sym. shall be provided for each phase of the transformer
primary. Bay-O-Nets shall be located so that expulsions will not create gas
pockets across any phase to phase or phase to ground terminals which might
initiate arcing. Fuses shall be coordinated with specified internal lightning
arresters to prevent nuisance fuse blowing as a result of current developed in
the transformer due to discharge voltage of the arrester saturating the
transformer core.
D. Bushings:
1. Six (6) 600 amp deadbreak primary bushings for use on 15 kV Class
apparatus, arranged to form a “V” configuration, shall be provided in the
primary compartment for receiving dead-front cable connectors. At least
six (6) parking stands shall be located in the primary compartment and
shall be so arranged that any terminated cable can be disconnected from
its bushing and placed on a stand-off plug or a grounding plug mounted in
the respective parking stand without straining the cable. Primary
bushings must accept and interface with either Elastimold or RTE (600)
(200) amp elbow connector.
2. Secondary of transformer shall be connected through low voltage bushings
with tinned copper terminal spades, each having NEMA spaced holds, (*750 kVA & larger). Bushings shall be arranged for clearance and cabling
from below. A minimum of 4” shall be maintained between the tank wall
and the center of the terminal hole nearest the tank. A minimum 6” shall
be maintained between the sides of each bushing.
*Provide with insulated steel support system, 125# min./spade
3. Primary and secondary bushings shall be field replaceable, externally
clamped type, compatible, and interfaced to accept cable terminations
specified elsewhere herein.
E. Insulating Oil
1. Transformers shall be filled with Type II mineral oil per ASTM D3487,
latest revision, and shall be certified to contain less than one part per
million (1ppm) Polychlorinated Biphenyls (PCB’s) as measured on a dry
weight basis. A notice to this affect shall be included on the transformer
nameplate. No non-PCB labels shall be attached to the unit.
F. Transformer Accessories:
1. Furnished by transformer manufacturer on unit:
The University of Georgia Facilities Management Division
1180 East Broad Street – 0201 Chicopee Complex • Athens, Georgia 30602 • Telephone (706) 542-7369
An Equal Opportunity/Affirmative Action Institution
Page |5
a. Top-mounted access cover
b. Primary bushing dust covers, 6-each
c. Accessory group consisting of 1” drain and ½” sampling devices,
thermometer, and oil level gauge. These devices shall be located in
secondary compartment.
d. Combination pressure-relief/air-bleed device, with 9-11 psi relief
pressure rating, 7 or less psi closing pressure rating, and 50 cfm
discharge rate of flow at 13-15 psi, enclosed in a corrosion resistant
housing such as brass or stainless steel, with O-ring seal and ¼” –
18NPT pipe threads, located in the secondary compartment, except
when secondary breakers or panels are specified herein, or
scheduled on the drawings and obstruct safe inspection, testing, or
use, shall be located in the primary compartment.
e. Pressure relief device with 10 psi maximum relief pressure and
enclosed in tamper-proof metal enclosure located on top of
transformer tank.
f. Manual tap changer for de-energized operation shall be located in
the primary compartment.
g. Handles for primary loop-feed switch shall be located in the
primary compartment.
h. Phase and switch identification
i. Stainless steel nameplate with schematic diagram and other data
j. Installation, operating and maintenance instructions (complete set
secured in waterproof holder inside secondary compartment door)
k. Parking stand brackets (at least one per cable termination)
l. Grounding pads (2 per compartment)
m. Oil fill plug
n. Oil fuse drip tray
o. Spare fuses on the order of 10%, but in no case less than three (3) of
any type or rating for entire project.
p. Pressure vacuum gage
G. All Tap Changers Shall:
1. Be externally operated
2. Have the same BIL rating when operated at each tap setting
3. Be provided with positive stops to identify the highest and lowest tap
positions
4. Be located in the high voltage terminating compartment
5. Be designed to prevent accidental operation by requiring a preliminary step
such as loosening a set screw before the tap position can be changed. This
positive locking device shall be clearly visible to field personnel operating
the tap changer.
6. Have either a permanent clearly marked indicator plate or tap positions
stenciled on the transformer tank with oil resistant material.
7. Have all components constructed of corrosion resistant material.
8. Be designed for operation using hot line tools.
9. Rotate in a clockwise direction from the high tap voltage to a lower tap
voltage in the high voltage winding.
The University of Georgia Facilities Management Division
1180 East Broad Street – 0201 Chicopee Complex • Athens, Georgia 30602 • Telephone (706) 542-7369
An Equal Opportunity/Affirmative Action Institution
Page |6
H. Metal oxide varistor distribution under oil surge arresters shall be provided for
each primary phase and be integrally connected and shall be located in oil
filled compartment.
Ratings
I. Pad-Mount Transformers:
1. Capacity: Self-cooled continuous kVA rating indicated in the summary
sheet (page one of this document).
2. Phase/Frequency: Three/60 hertz
3. Temperature Rise: 65 degrees Celsius
4. BIL: 95 kV min Primary: 30 kV min. secondary.
5. Primary Voltage: 12,470 Gnd. Y, 2-phase, 4-wire.
6. Secondary Rating: 480 Grd. Y/277 volts or 208 Grd. Y/120 volts as
specified in the summary sheet (page one of this document), 3-Phase 4wire. Secondary spades will be compatible with transformer capacity at full
load.
7. Taps: Five (5) two and one-half percent (2-½%) rated taps two (2) above
and two (2) below normal in the high voltage windings.
8. Transformer efficiency complies with DOE 10 CFR Part 431 Energy
Conservation program for Commercial Equipment: Distribution
Transformers Energy Conservation Standards: Final Rule dated
10/12/2007.
9. Meets NENA TR-1 sound level.
J. Integral Loop-Feed Switches
1. Capacity: 600 amps RMS Continuous and Load Break
2. Phase/Frequency: Three/60 hertz
3. BIL: 125 kV minimum
4. Voltage: 27 kV maximum
5. Momentary and fault close:
a. 12,000 amps RMS-SYM
b. 18,600 amps RMS-ASYM
6. 60 Hz One Minute Withstand: 34 kV
7. Number of Loadbreak Operations at Continuous Amps: 25
8. No-Load Mechanical Operation: 500
9. Fault Operations: 2
K. Integral Oil-Immersed Distribution Lightning Arrester:
1. Arrester Rating: 10kV rms. @ 12.5 kV
2. Maximum Continuous Voltage Capacity: 8.4 kV rms. (L-G)
3. Equivalent Front of Wave Protection Level*: 35.3 kV-Crest, or less
*Equivalent FOW protection level is the discharge voltage for a 10KA
current wave, which as a voltage move, cresting in 0.5 micro-seconds
4. Maximum Discharge Voltage (kV Crest) at Indicated Impulse Currents
using 8 X 20 Microsecond Current Wave: 1.5KA-27 kV; 5KA-30.3 kV;
10KA-33 kV; 20KA-37.2 kV
5. Insulating Liquid (Oil): 30kV dieletric strength when tested per ASTM
D877.
The University of Georgia Facilities Management Division
1180 East Broad Street – 0201 Chicopee Complex • Athens, Georgia 30602 • Telephone (706) 542-7369
An Equal Opportunity/Affirmative Action Institution
Page |7
2.2 – Fabrication and Manufacturer
A. Transformer construction shall be tamper-resistant with no externally
removable fastening devices. Low voltage (secondary) air filled terminal
compartment shall be located on the right and shall be accessible through a
hinged steel door with pad-lockable handle and three-point latches. High
voltage (primary) air filled terminal compartment shall be located on the left
and shall be accessible through a hinged door only after the secondary
compartment door has been opened, and secured by slotted captive bolts.
Primary and secondary compartments shall be separated by a barrier. Doors
and sills shall be removable to facilitate rolling and skidding the transformer
unit into place over conduit stub-ups, making connections, and pulling-in
cables. Dimension of primary and secondary compartments shall be as
follows:
1. Minimum Dimensions:
Compartment Size
Transformer
Size
Depth (Primary and Secondary)
Width
Secondary Overall
150-500kVA
750-2500kVA
24"
24"
27"
30"
62"
65"
2. Maximum Dimensions
Compartment Size
Transformer
Size
Depth (Primary and Secondary)
Width
Secondary Overall
150-500kVA
750-2500kVA
As Required
As Required
33"
36"
70"
72"
B. Primary loop-feed switch shall be a three-phase, gang operated, disconnecting
device and shall interrupt all three phases simultaneously. Operation shall be
for loop-and-fused tap, for through feed, alternate feed, or sectionalizing.
After withstand or closing-in on maximum rated fault current, the loadbreak
oil switch shall be operable in normal manner and capable of carrying its rated
load current without exceeding temperature rise limitation. Connections to
primary of transformers shall be integral with construction of complete padmount transformer unit. Construction shall be dead-front. All operating
mechanisms and contacts shall be arranged for inspection, maintenance, or
replacement and contacts shall be silver-plated.
C. Transformers shall have either a five (5) legged ore or a triplex design. The
core and coil shall be vacuum processed to ensure maximum penetration in
The University of Georgia Facilities Management Division
1180 East Broad Street – 0201 Chicopee Complex • Athens, Georgia 30602 • Telephone (706) 542-7369
An Equal Opportunity/Affirmative Action Institution
Page |8
insulating fluid into the coil insulation system. While under vacuum, the
windings will be energized to heat the coils and drive out moisture, and the
transformer will be filled with preheated filtered degassed insulating fluid.
The core shall be manufactured from burr-free, grain-oriented silicon steel and
shall be precisely stacked to eliminate gaps in the corner joints. The coil shall
be insulated with epoxy coated insulating paper which shall be thermally cured
under pressure to ensure proper bonding of conductor and paper.
Shipping
Items are to be shipped to the following address:
UGA Facilities Management Division
Campus High Voltage
ATTN: Rickey Poole
Chicopee No. 1
1180 East Broad Street
Athens, Georgia 30602
Payment Terms
1. Payment terms are Net 30 Days from receipt of a properly submitted invoice to
the University of Georgia Accounts Payable Department. To ensure prompt and
accurate payment, invoices must include the appropriate Purchase Order
number. Invoices may be submitted to the below address or via email at
actpay@uga.edu
The University of Georgia
Attn: Accounts Payable
Business Services Building
424 East Broad Street
Room 302
Athens, Georgia 30602-1535
Questions should be referred to:
Jared Peden
Procurement Specialist
(706) 542-7073
jpeden@uga.edu
The University of Georgia Facilities Management Division
1180 East Broad Street – 0201 Chicopee Complex • Athens, Georgia 30602 • Telephone (706) 542-7369
An Equal Opportunity/Affirmative Action Institution