April 4, 2014
Bid Issue
Student Services & Classroom Addition
Union County College
Cranford, New Jersey
SECTION 261213 - LIQUID-FILLED, MEDIUM-VOLTAGE TRANSFORMERS
PART 1 - GENERAL
1.1
SUMMARY
A.
1.2
Section includes liquid-filled, medium-voltage substation transformers, with primary and
secondary bushings within or without air-terminal enclosures.
ACTION SUBMITTALS
A.
Product Data: For each type of product.
B.
Shop Drawings: For liquid-filled, medium-voltage transformers.
1.
Include plans and elevations showing major components and features.
a.
2.
3.
1.3
Include a plan view and cross section of equipment base, showing clearances,
manufacturer's recommended workspace, and locations of penetrations for
grounding and conduits.
Include details of equipment assemblies and indicate dimensions, weights, loads, required
clearances, method of field assembly, components, and location and size of each field
connection.
Include single-line diagram.
INFORMATIONAL SUBMITTALS
A.
Coordination Drawings for Outdoor Installations:
1.
B.
Utilities site plan, drawn to scale, showing heavy equipment or truck access paths for
maintenance and replacement.
Coordination Drawings for Indoor Installations:
1.
2.
Location plan, showing heavy equipment or truck access paths for maintenance and
replacement.
Dimensioned concrete base, outline of transformer, conduit entries, and grounding
equipment locations.
C.
Seismic Qualification Certificates: For transformer assembly, accessories, and components,
from manufacturer.
D.
Product certificates.
LIQUID-FILLED, MEDIUM-VOLTAGE TRANSFORMERS
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April 4, 2014
Bid Issue
Student Services & Classroom Addition
Union County College
Cranford, New Jersey
E.
Source quality-control reports.
F.
Field quality-control reports.
1.4
CLOSEOUT SUBMITTALS
A.
1.5
Operation and maintenance data.
QUALITY ASSURANCE
A.
Testing Agency Qualifications: Member company of NETA or an NRTL.
1.
Testing Agency's Field Supervisor: Certified by NETA to supervise on-site testing.
PART 2 - PRODUCTS
2.1
MANUFACTURERS
A.
2.2
Available Manufacturers: Subject to compliance with requirements, available manufacturers
offering products that may be incorporated into the Work include, but are not limited to, the
following:
1.
Eaton Electrical Inc.; Cutler-Hammer Business Unit.
2.
General Electric Company; GE Consumer & Industrial - Electrical Distribution.
3.
Siemens Energy & Automation, Inc.
4.
Square D; a brand of Schneider Electric.
SYSTEM DESCRIPTION
A.
Electrical Components, Devices, and Accessories: Listed and labeled as defined in NFPA 70, by
a qualified testing agency, and marked for intended location and application.
B.
Comply with IEEE C2.
C.
Comply with IEEE C57.12.00.
2.3
PERFORMANCE REQUIREMENTS
A.
Seismic Performance: The transformers shall withstand the effects of earthquake motions
determined according to ASCE/SEI 7.
1.
2.
The term "withstand" means "the transformer will remain in place without separation of
any parts when subjected to the seismic forces specified and the transformer will be fully
operational after the seismic event."
Component Importance Factor: 1.0.
LIQUID-FILLED, MEDIUM-VOLTAGE TRANSFORMERS
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April 4, 2014
Bid Issue
3.
4.
Student Services & Classroom Addition
Union County College
Cranford, New Jersey
Component Amplification Factor: 1.0.
Component Response Modification Factor: 1.5.
B.
Windings Material: Copper.
C.
Surge Arresters: Comply with IEEE C62.11, Distribution Class; metal-oxide-varistor type,
connected in each phase of incoming circuit and ahead of any disconnecting device.
D.
Winding Connections: The connection of windings and terminal markings shall comply with
IEEE C57.12.70.
E.
Insulation:
1.
Transformer kVA Rating Shall Be as Follows: The average winding temperature rise
above ambient temperature shall not exceed 65 deg C and 80 deg C hottest-spot
temperature rise at rated kVA when tested according to IEEE C57.12.90, using
combination of connections and taps that give the highest average winding temperature
rise.
F.
Bushings shall comply with IEEE C57.19.01 requirements for impulse and low-frequency
insulation levels.
G.
Tap Changer: External, for de-energized operation.
H.
Mounting: An integral skid mounting frame, suitable to allow skidding or rolling of transformer
in any direction, and with provision for anchoring frame to pad.
I.
Insulating Liquids:
1.
J.
Mineral Oil: ASTM D 3487, Type II, and tested for compliance with ASTM D 117.
Capacities and Characteristics:
1.
2.
3.
Location: Outdoors.
Additional IEEE Standards: Comply with IEEE C57.12.10.
Connections:
a.
b.
4.
Primary: Air-filled terminal cabinet for cable connection
Secondary: Air-filled terminal cabinet for cable connection
Transformer Ratings. Comply with IEEE C57.12.00 for cooling class.
a.
b.
c.
Impedance: Not less than 5.75 percent.
Temperature Rise: 65 deg C.
Coils Connection:
1)
2)
d.
High-Voltage Winding: Delta.
Low-Voltage Winding: Wye.
Voltage and BIL Ratings:
LIQUID-FILLED, MEDIUM-VOLTAGE TRANSFORMERS
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April 4, 2014
Bid Issue
Student Services & Classroom Addition
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Cranford, New Jersey
1)
2)
5.
6.
7.
Outdoor Transformer Enclosure Finish: Factory-applied finish in manufacturer's standard
color, corrosion resistance complying with IEEE C57.12.28.
Taps: Two 2-1/2-percent, full-capacity taps above, and two 2-1/2-percent, full-capacity
taps below rated voltage. Comply with IEEE C57.12.36 requirements.
Transformer Accessories:
a.
b.
c.
d.
e.
f.
g.
h.
i.
j.
2.4
Nominal primary phase-to-phase voltage and BIL: 13,800 V, 95 kV
Nominal secondary voltage and BIL: 208Y/120 V, 45 kV.
Drain and filter connection.
Filling and top filter press connections.
Pressure-vacuum gauge.
Dial-type analog thermometer with alarm contacts.
Magnetic liquid level indicator with high and low alarm contacts.
Pressure-relief device set to operate at 10 psig, plus or minus 2 psig, and then
automatically reseal when pressure drops to 6-psig minimum. Device flow shall be
as recommended by manufacturer. With alarm contacts and a manual bleeder.
At least four stainless-steel ground connection pads.
Provisions for jacking, lifting, and towing.
Machine-engraved nameplate made of anodized aluminum or stainless steel.
Sudden pressure relay for remote alarm or trip when internal transformer pressure
rises at field-set rate. Provide without seal-in delay.
CONTROL NETWORK
A.
2.5
Controllers: Support serial MS/TP and Ethernet IP communications, and able to communicate
directly via RS-485 serial networks and Ethernet 10Base-T networks as a native device.
WARNING LABELS AND SIGNS
A.
Comply with requirements for labels and signs specified in Section 260553 "Identification for
Electrical Systems."
1.
2.
2.6
Warning signs shall be made of baked enamel.
Equipment Identification Labels: Stenciled legend 4 inches (100 mm) high.
SOURCE QUALITY CONTROL
A.
Provide manufacturer's certificate verifying the transformer design tests comply with
IEEE C57.12.90.
B.
Perform the following factory-certified routine tests on each transformer for this Project:
1.
2.
3.
4.
Resistance.
Turns ratio, polarity, and phase relation.
Transformer no-load losses and excitation current at 100 percent of ratings.
Transformer impedance voltage and load loss.
LIQUID-FILLED, MEDIUM-VOLTAGE TRANSFORMERS
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April 4, 2014
Bid Issue
5.
6.
7.
8.
9.
Student Services & Classroom Addition
Union County College
Cranford, New Jersey
Operation of all devices.
Control (auxiliary) and consumption losses.
Lightning impulse.
Low frequency.
Leak test.
PART 3 - EXECUTION
3.1
EXAMINATION
A.
Handling:
1.
2.
3.
Handle transformers carefully. Do not subject transformers to impact, jolting, jarring, or
rough handling.
Protect transformer termination compartments against entrance of dust, rain, and snow.
Transport transformers upright.
B.
Examine areas and space conditions for compliance with requirements for liquid-filled,
medium-voltage transformers and other conditions affecting performance of the Work.
C.
Examine roughing-in of conduits and grounding systems to verify the following:
1.
2.
Wiring entries comply with layout requirements.
Entries are within conduit-entry tolerances specified by manufacturer, and no feeders will
cross section barriers to reach load or line lugs.
D.
Verify that ground connections are in place and that requirements in Section 260526
"Grounding and Bonding for Electrical Systems" have been met. Maximum ground resistance
shall be 5 ohms at transformer location.
E.
Proceed with installation only after unsatisfactory conditions have been corrected.
3.2
INSTALLATION
A.
Install transformers on cast-in-place concrete equipment base(s). Comply with requirements for
equipment bases and foundations specified in Section 033000 "Cast-in-Place Concrete.".
B.
Transformer shall be installed level and plumb and shall tilt less than 1.5 degrees while
energized.
C.
Comply with requirements for vibration isolation and seismic control devices specified in
Section 260529 "Hangers and Supports for Electrical Systems" and Section 260548.16 "Seismic
Controls for Electrical Systems."
D.
Maintain minimum clearances and workspace at equipment according to manufacturer's written
instructions and NFPA 70.
LIQUID-FILLED, MEDIUM-VOLTAGE TRANSFORMERS
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April 4, 2014
Bid Issue
3.3
Student Services & Classroom Addition
Union County College
Cranford, New Jersey
CONNECTIONS
A.
Ground equipment according to Section 260526 "Grounding and Bonding for Electrical
Systems."
1.
2.
At Interior Locations: For grounding to grounding electrodes, use bare copper cable not
smaller than No. 4/0 AWG. Bond surge arrester and neutrals directly to transformer
enclosure and then to grounding electrode system with bare copper conductors. Keep
leads as short as practicable, with no kinks or sharp bends. Make joints in grounding
conductors and loops by exothermic weld or compression connector.
At Exterior Locations:
a.
b.
c.
3.
4.
B.
3.4
For counterpoise, use tinned bare copper cable not smaller than No. 4/0 AWG,
buried not less than 30 inches (765 mm) below grade interconnecting grounding
electrodes. Bond surge arrester and neutrals directly to transformer enclosure and
then to grounding electrode system with bare copper conductors. Keep lead lengths
as short as practicable, with no kinks or sharp bends.
Fence and equipment connections shall not be smaller than No. 4 AWG. Ground
fence at each gate post and corner post and at intervals not exceeding 10 ft. (3050
mm.) Bond each gate section to fence post using 1/8 by 1 inch (3 by 25 mm)
tinned flexible braided copper strap and clamps.
Make joints in grounding conductors and loops by exothermic weld or
compression connector.
Terminate all grounding and bonding conductors on a common equipment grounding
terminal on transformer enclosure. Install supplemental terminal bars, lugs, and bonding
jumpers as required to accommodate number of conductors for termination.
Complete transformer tank grounding and lightning arrester connections prior to making
any other electrical connections.
Terminate medium-voltage cables in incoming section of substations according to
Section 260513 "Medium-Voltage Cables."
SIGNS AND LABELS
A.
Comply with installation requirements for labels and signs specified in Section 260553
"Identification for Electrical Systems."
B.
Install warning signs as required to comply with 29 CFR 1910.269.
3.5
FIELD QUALITY CONTROL
A.
Testing Agency: Engage a qualified testing agency to perform tests and inspections.
B.
Perform the following tests and inspections with the assistance of a factory-authorized service
representative:
1.
General Field-Testing Requirements:
LIQUID-FILLED, MEDIUM-VOLTAGE TRANSFORMERS
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April 4, 2014
Bid Issue
Student Services & Classroom Addition
Union County College
Cranford, New Jersey
a.
b.
3.6
Comply with provisions of NFPA 70B, Ch. "Testing and Test Methods."
After installing transformer but before primary is energized, verify that grounding
system at substation is tested at specified value or less.
DEMONSTRATION
A.
Engage a factory-authorized service representative to train Owner's maintenance personnel to
adjust, operate, and maintain systems.
END OF SECTION 261213
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