sEcTtoN 16272
DRY TYPE TRANSFORMERS
PART
I
I.O1
SUMMARY
A.
B.
GENERAL
Section includes requirements for:
Enclosed dry{ype transformers:
Stand alone units.
Units located in motor control centers.
Units located in packaged power supply centers.
Drive isolation transformers.
Rated 1 to 1,000 kilovolt-amperes, single and 3-phase.
f
Primary voltage 600 volts and below.
1.
a.
b.
c.
d.
e.
.
Related Sections:
Contract Documents are a single integrated document, and as such all
Divisions and Sections apply. lt is the responsibility of the CONTRACTOR and
its subcontractors to review all Sections to ensure a complete and coordinated
project.
1.
1.02 REFERENCES
A.
B.
Refer to Section 16050.
lnstitute of Electrical and Electronic Engineers (IEEE):
C57.12.01 - Standard General Requirements for Dry-Type Distribution and
Power Transformers lncluding Those with Solid Cast and/or Resin
Encapsulated Windings.
C57.12.91 - Standard Test Code for Dry-Type Distribution and Power
Transformers.
1.
2.
C.
National Electrical ManufacturersAssociation (NEMA):
TP-1 - 1996 - Guide for Determining Energy Efficiency for Distribution
Transformers.
TP-2 - Standard Test Method for Measuring the Energy Consumption of
Distribution Transformers.
D.
Undenruriters Laboratory (UL):
1.
2.
1.
1561 - Standard for Safety for Dry-Type General Purpose and Power
Transformers.
1.03 DEFINITIONS
A.
Referto Section 16050.
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1.04
SYSTEM DESCRIPTIONS
A.
Provide 3-phase, or 1-phase, 60 hertz dry-type with voltage ratings, kilovolt-ampere
capacities, and connections as indicated on the Drawings:
Transformers shall provide full capacity at the project elevation and
environmental conditions as specified in Section 16050 after all derating
factors have been applied.
Suitable for continuous operation at full rating with normal life expectancy as
defined in ANSI C57.96.
1.
2.
1.05
SUBMITTALS
A.
B.
Furnish submittals in accordance with Sections 01300 and 16050.
Product Data:
Catalog cut sheets.
Nameplate data.
Dimensions:
Height.
w¡dth.
Depth.
lnrush cunent.
lnsulation system and temperature constraints.
Number and rating of taps.
Sound levels.
Connection Diagrams:
Primary.
Secondary.
BIL rating.
10. Required clearances.
11. Percent impedance.
12. Efficiency.
13. Certification of full capacity capability at the project elevation and ambient
conditions.
1.
2.
3.
4.
5.
6.
7.
8.
9.
C.
a.
b.
c.
a.
b.
lnstallationlnstructions:
Províde anchorage instructions and requirements for the transformer based on
the seismic requirements at the project site as indicated in Section 16050.
Drawings and calculations stamped and signed by a Professional Engineer
registered in the State of Texas.
1.
2.
I.06 QUALITY ASSURANCE
A. Referto Section 16050.
1.07 DELIVERY, STORAGE, AND HANDLING
A.
Refer to Section 16050.
1.08 PROJECT OR SITE CONDITIONS
A.
Refer to Section 16050.
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I.O9
WARRANTY
A.
1.1O
Refer to Section 16050.
SYSTEM START UP
A.
Refer to Section 16050.
PART
2
PRODUCTS
2.01
MANUFACTURERS
A.
One of the following or equal:
General Electríc.
Jefferson.
Square D.
Cutler Hammer.
ABB.
B.
Drive lsolation Transformers: One of the following or equal:
General Electric.
Square D.
Cutler-Hammer.
1.
2.
3.
4.
5.
1.
2.
3.
2.O2 MATERIALS
A.
B.
Cores:
Non-aging, grain-oriented silicon steel.
Magnetic flux densities below the saturation point.
1.
2.
Windings:
High-grade magnet wire.
lmpregnated assembly with non-hydroscopic, thermo-setting varnish:
Cured to reduce hot-spots and seal out moisture.
1.
2.
a.
3. Materialelectricalgrade:
a. Copper-
2.O3 EQUIPMENT
A.
General:
10 kilovolts BIL for 600-volt class windings.
Sound levels, under ANSI Standard C89 test conditions, not to exceed:
1.
2.
Kilovolt-Amperes
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Range
Audible Sound Level (db)
1-9
40
10-50
45
51-1 50
50
151-300
55
301-500
60
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Range
501-700
701-1000
Kilovolt-Amperes
3.
4.
5.
B.
C.
64
Taps:
15 kilovolt-amperes and less:
Two 5 percent full capacity primary taps below rated voltage.
25 kilovolt-amperes and larger:
Four 2.5 percent full capacity primary taps below rated voltage.
Two 2.5 percent full capacity primary taps above rated voltage.
Operated by a tap changer handle or tap jumpers accessible through a
panel.
Terminals:
UL listed for either copper or aluminum conductors.
Rated tor 75 degrees Celsius.
Daily overload capacities, at rated voltage and without reduction in life, in
accordance with the loading guide as published in ANSI C57.96.
a.
1)
b.
1)
2)
c.
a.
b.
1.
2.
Energy effìcient transformers 15 Kilovolt-Amperes and larger:
lnsulation Class: 220 degrees Celsius.
Temperature rise: 115 degrees Celsius, except as noted below:
150 degree Celsius rise for dry-type transformers located in Motor Control
Centers.
Efficiency:
As specified in NEMA TP-1-1996.
Measured by NEMA TP-z.
Labeled with Energy Star label.
1.
2.
4.
a.
a.
b.
Enclosures:
Heavy gauge steel:
Outdoor - moisture and water resistant with rodent screens over all
openings and in a weather-protected enclosure, NEMA 3R.
lndoor NEMA 2.
Louvers to limit coíltemperature rise to the value stated above, and case
temperature rise to 50 degrees Celsius.
Built-in vibration dampeners to isolate the core and coíls from the enclosure:
Neoprene vibration pads and sleeves.
1.
2.
3.
2.04
62
Transformers less than 15 Kílovolt-Amperes:
lnsulation Class: 185 degrees Celsius.
Temperature Rise: 115 degrees Celsius.
3.
D.
Audible Sound Level (db)
a.
b.
a.
ACCESSORTES
A.
Nameplates:
Non-corrosive metal or UL listed non-metallic:
Stamped, engraved or printed with the following information:
Phases.
Frequency.
Kilovolt-ampererating.
Voltage ratings.
Temperature rise.
1.
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6)
7)
8)
9)
lmpedance.
lnsulation class.
BIL rating.
Connection diagram.
10) Weight.
11) Manufacturer.
12) The identification "transformer".
13) Classes of coolíng.
14) Tapvoltage(s).
15) Vector diagram.
2.05
FINISHES
A.
2.06
Finish to consist of de-greasing, phosphate cleaning, and an electrodeposited ANSI
61 gray enamel rust-inhibiting paint.
SOURCE QUALITY GONTROL
A.
Factory Tests:
Applied voltage test to each winding and from each winding to the core:
600-volt class winding 4.5 kilovolt.
lnduced voltage test at 2 times normal voltage and 400 hertz for 1,080 cycles.
Voltage ratio and polarity.
Sound level, performed in a test room with ambient sound level not exceeding
24 db.
Perform all tests in accordance with UL-1561.
1.
a.
2.
3.
4.
5.
PART
3
3.OI
INSTALLATION
A.
B.
EXECUTION
Refer to Section 16050.
General:
Floor, wall, platform, motor control center, packaged power supply, or roof
mounted, as indicated on the Drawings.
Locate where not in direct contact with building structure.
lnstall on double-deflection mounts selected for maximum isolation
manufactured by Korfund or equal.
Make any necessary connections to the enclosure with liquidtight flexible
conduit having neoprene gaskets and insulated ground bushings.
Ground the enclosure:
To an equipment ground conductor in the conduit.
To the facility grounding electrode system.
Floor mounted transformers:
lnstalltransformers on 3-112 inch housekeeping pads.
lnstall transformers with adequate space from walls or other enclosures
for proper ventilation in accordance with the manufactureds
recommendations.
1.
2.
3.
4.
5.
a.
b.
6.
a.
b.
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3.02
FIELD QUAL]W CONTROL
A,
Refer to Section 16050.
3.03 ADJUSTING
A.
3.04
CLEANING
A.
3.05
Set the transformer taps, as required to obtain nominal output voltage on the
secondary terminals.
Refer to Section 16050-
PROTECTION
A-
Refer to Section 16050.
END OF SECTION
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