CONSTRUCTION STANDARD SPECIFICATION

SECTION 16272

[PADMOUNT TRANSFORMERS]{.underline}

Page

PART 1 - GENERAL

1.01 Summary [2](#__RefHeading___Toc24771854)

1.02 References [2](#__RefHeading___Toc24771855)

1.03 Submittals [3](#__RefHeading___Toc24771856)

1.04 Quality Assurance [4](#__RefHeading___Toc24771857)

PART 2 - PRODUCTS

2.01 KVA Ratings [4](#kva-ratings)

2.02 Voltage Ratings And Tap Ratings
[4](#voltage-ratings-and-tap-ratings)

2.03 Core Design [5](#core-design)

2.04 High Voltage Taps [5](#high-voltage-taps)

2.05 Transformer Impedances [5](#transformer-impedances)

2.06 Short-Circuit Capability [6](#short-circuit-capability)

2.07 Overcurrent Protection [6](#overcurrent-protection)

2.08 Construction [6](#construction)

2.09 Manufacturer [8](#manufacturer)

2.10 Low Voltage Bushings And Terminals
[8](#low-voltage-bushings-and-terminals)

2.11 High Voltage Bushings And Terminals
[9](#high-voltage-bushings-and-terminals)

2.12 Accessories [9](#accessories)

2.13 Jacking, Rolling, Lifting, And Mounting Facilities
[10](#jacking-rolling-lifting-and-mounting-facilities)

2.14 Terminal Markings [10](#terminal-markings)

2.15 Instruction Nameplate [10](#instruction-nameplate)

2.16 Oil Preservation [10](#oil-preservation)

2.17 Tanks [10](#tanks)

PART 3 - EXECUTION

3.01 Installation [11](#installation)

3.02 Identification Tags [12](#identification-tags)

PART 4 - EVALUATION

4.01 Loss Evaluation [12](#loss-evaluation)

ATTACHMENT [14](#attachment)

Sketch "A" [14](#sketch-a)

CONSTRUCTION STANDARD SPECIFICATION

SECTION 16272

[PADMOUNT TRANSFORMERS]{.underline}

# GENERAL {#general .Style1-SECTION1-+-Underline}

## SUMMARY {#summary .SECTION1.01-+-All-caps}

A.  This specification is written for three-phase, 60 hertz, 65°C
    temperature rise, liquid filled, self-cooled, pad mounted,
    live-front, compartmentalized distribution transformers, rated 1,500
    kVA and below, radial feed.

B.  Pad mounted transformers shall be provided and installed in
    accordance with the details and ratings on the working drawings and
    in accordance with this specification.

## REFERENCES {#references .SECTION1.01-+-All-caps}

A.  Related Drawings: Refer to the following Sandia National
    Laboratories (SNL) Facilities Standard Drawings:

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1.  WP3003STD -- Transformer Fire Barrier Wall.

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A.  American National Standards Institute/Institute of Electrical and
    Electronic Engineer (ANSI/IEEE)

    C57.12.00 IEEE Standard General Requirements for Liquid-Immersed
    Distribution, Power, and Regulating Transformers

    C57.12.90 IEEE Standard Test Code for Liquid-Immersed Distribution,
    Power, and Regulating Transformers and IEEE Guide for Short-Circuit
    Testing of Distribution and Power Transformers

B.  American National Standards Institute (ANSI)

    C57.12.22 Pad-Mounted, Compartmental-Type Self-Cooled Three-Phase
    Distribution Transformers with High-Voltage Bushings, 2500 kVA and
    Smaller; High Voltage 34,500 Grd Y/19,920 Volts and Below; Low
    Voltage, 480 Volts and Below-Requirements

    C57.12.26 Pad-Mounted Compartmental-Type, Self-Cooled, Three-Phase
    Distribution Transformers for Use with Separable Insulated
    High-Voltage Connectors, High-Voltage, 34,500 Grd Y/19,920 Volts and
    Below; 2500 kVA and Smaller

##  {#section .SECTION1.01-+-All-caps}

##  {#section-1 .SECTION1.01-+-All-caps}

##  {#section-2 .SECTION1.01-+-All-caps}

##  {#section-3 .SECTION1.01-+-All-caps}

## SUBMITTALS {#submittals .SECTION1.01-+-All-caps}

The following shall be submitted in accordance with Division 1, Section
01330, "Submittal Procedures.\"

A.  Outline drawings including overall height, overall width, overall
    depth, base dimensions, arrangement of bushings, and other
    appurtenances, and compartment dimensions.

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A.  Weights of the tank, oil, and total transformer.

B.  Volume of oil, gallons.

C.  Test and Performance Data

    The manufacturer shall perform the following routine tests as
    defined in ANSI C57.12.00 (latest edition).

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1.  Exciting current at 100% and 110% of rated voltage.

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1.  Average excitation loss in accordance with ANSI C57.12.00-1987 the
    latest edition), Section 9, paragraph 9.3, and Table 18, line 3.

2.  Average total loss in accordance with ANSI C57.12.00-1987 the latest
    edition), Section 9, paragraph 9.3, and Table 18, line 3.

3.  Percent impedance volts, of the low voltage winding with respect to
    the high voltage winding at rated self-cooled kVA.

4.  Steady state transformer top oil temperature rise above ambient,
    degree Celsius.

5.  Transformer oil time constant, time for top oil to obtain 63% of
    steady state rise above ambient.

6.  Certified statement of compliance with short circuit capability
    requirements of Paragraph 2.06.

7.  Certification of tamper resistant design with complete test data.

8.  Certified high and low voltage impulse data.

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D.  Production Test Data

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9.  The manufacturer shall perform all routine tests as defined in ANSI
    C57.12.00 (latest edition).

10. The manufacturer shall perform production line high voltage and low
    voltage impulse tests on each unit as defined in ANSI C57.12.00
    (latest edition).

11. The manufacturer shall provide Sandia with the following certified
    data by transformer serial number for each transformer shipped.

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a.  Excitation loss, watts.

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a.  Impedance, % Z.

b.  Total loss, watts @ 85º C.

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E.  Manufacturer shall certify that all transformers supplied under this
    specification contain less than 1 ppm PCB.

F.  All required information and laboratory test performance data per
    Section 3.1.2 of \"EEI Finishing Guidelines for Padmounted
    Equipment,\" Draft 6.

G.  No individual transformer shall be shipped with losses that exceed
    quoted losses by more than the tolerances in ANSI C57.12.00 (latest
    edition), Table 18, line 2, without written approval of Sandia
    National Laboratories/New Mexico (SNL/NM).

## QUALITY ASSURANCE {#quality-assurance .SECTION1.01-+-All-caps}

A.  All characteristics, definitions, terminology, and voltage
    designations, except as otherwise specified herein, shall be in
    accordance with applicable provisions of the latest edition of ANSI
    C57.12.22, or its successors, and applicable ANSI C57 series
    specifications including C57.12.00 (latest edition).

B.  Manufacturer will state the edition and date of ANSI C57.12.22 on
    submittals.

C.  Manufacturer shall provide a warranty on each unit stating that the
    unit will be free of defects in workmanship and material for a
    period of twelve (12) months from the date of initial installation
    or eighteen (18) months from the date of manufacture, whichever
    shall occur first.

#  PRODUCTS {#products .Style1-SECTION1-+-Underline}

## 2.01 KVA RATINGS

Kilovolt-ampere ratings shall be 75, 150, 300, 500, 750, 1000, or 1500.

## 2.02 VOLTAGE RATINGS AND TAP RATINGS

Voltage ratings, minimum BIL rating, and tap ratings shall be in
accordance with Table 1, below.

> [TABLE 1]{.underline}

+------------+--------+---------------+-----------+--------------------+
| High       | BIL    | Low Voltage   | kVA       | High Voltage Taps  |
| Voltage    |        |               |           | Required           |
| Rating     | Rating | Rating        | Rating    |                    |
| (Volts)    | (kV)   | (Volts)       |           |                    |
| Delta      |        |               |           |                    |
|            |        | Wye           |           |                    |
+------------+--------+---------------+-----------+--------------------+
| 2,400      | 45     | 208Y / 120    | 75 - 1500 | 2½% Above & Below  |
+------------+--------+---------------+-----------+--------------------+
| 2,400      | 45     | 480Y / 277    | 75 - 1500 | 2½% Above & Below  |
+------------+--------+---------------+-----------+--------------------+
| 4,160      | 60     | 208Y / 120    | 75 - 1500 | 2½% Above & Below  |
+------------+--------+---------------+-----------+--------------------+
| 4,160      | 60     | 480Y / 277    | 75 - 1500 | 2½% Above & Below  |
+------------+--------+---------------+-----------+--------------------+
| 12,470     | 95     | 208Y / 120    | 75 - 1500 | 2½% Above & Below  |
+------------+--------+---------------+-----------+--------------------+
| 12,470     | 95     | 480Y / 277    | 75 - 1500 | 2½% Above & Below  |
+------------+--------+---------------+-----------+--------------------+

## 2.03 CORE DESIGN

Transformers shall be of five-legged core design and connected
delta-wye. A fully insulated, neutral bushing will bring the secondary
winding neutral to the outside of the tank and a ground pad will be
provided on the outside tank wall and will be connected to the neutral
bushing with a removable ground strap.

## 2.04 HIGH VOLTAGE TAPS

High voltage taps shall be provided in accordance with Table 1. Taps
shall be suitable for de-energized operation only. The tap changer
switch shall be ganged and shall be externally operable. Locate the
operating handle either in the high voltage compartment above the
primary bushings or in the secondary compartment above the low voltage
bushings. Set the tap changer on the 100% tap at the factory and secure
to prevent inadvertent change from this position.

## 2.05 TRANSFORMER IMPEDANCES

Minimum impedances shall be in accordance with Table 2 below:

> TABLE 2

  ------------------------ ----------------------- -----------------------
  Secondary Voltage                                

  \*Minimum AC Impedance %                         

                                                   

  kVA                      208Y / 120              480Y / 277

  75                       2.9                     2.6

  150                      3.0                     2.6

  300                      4.7                     2.6

  500                      4.7                     4.3

  750                      5.75                    5.75

  1,000                    5.75                    5.75

  1,500                    N/A                     5.75

                                                   
  ------------------------ ----------------------- -----------------------

\*ANSI Standard Tolerance (±7.5 %)

## 2.06 SHORT-CIRCUIT CAPABILITY

A.  Mechanical short-circuit capability shall be demonstrated by design
    compliance with ANSI C57.12.90 (latest edition).

B.  Thermal short-circuit capability shall be demonstrated by design
    compliance with ANSI C57-12.00 (latest edition).

## 2.07 OVERCURRENT PROTECTION

A.  Overcurrent protection devices shall not be supplied in radial feed
    transformers.

## 2.08 CONSTRUCTION

A.  Description

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12. Transformers shall be designed to protect people against accidental
    contact of energized parts, discourage unauthorized access to or
    climbing upon the unit by the public, and protect against weather.

13. The pad mounted transformer shall consist of the transformer tank,
    high-voltage cable terminating compartment, and the low-voltage
    cable terminating compartment. The transformer tank and compartment
    shall be assembled as a rain tight compartment, outdoor, and
    tamper-resistant integral unit suitable for mounting on a flat
    surface. The transformer design shall not use gasketing to meet this
    requirement.

14. There shall be no exposed screws, bolts, or other fastening or
    hinging devices (other than the pentahead bolt specified in 2.08
    D.5) that are externally removable. There shall be no opening
    through which foreign objects such as sticks or wires might be
    inserted to contact energized parts. Suitable means for padlocking
    the compartment door(s) shall be provided. Normal entry shall be
    possible only with the use of proper access tools.

15. The high- and low-voltage compartments shall be located side by side
    on one side of the transformer tank. When facing the compartment,
    the low voltage compartment shall be on the right.

16. Construction of the unit shall be such that it can be lifted,
    skidded, and slid into place on the mounting pad without disturbing
    the entrance cables.

17. All external surfaces shall be constructed of steel, 13 USS gauge or
    thicker.

18. The transformer and compartment hoods shall be crowned to insure
    water run off or manufactured with a full weather cover.

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B.  Bottom Protection

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19. The transformer tank base shall be raised above the pad to protect
    the bottom finish during installation and to minimize corrosion due
    to moisture accumulation. The base shall be cross-braced to permit
    rolling in two directions.

20. All external surfaces of ferrous material used in the construction
    of the assembly shall have undercoating over the regular finish,
    applied to the bottoms of the components and extending up the side
    to a point one to two inches above the bottom of their bases in a
    straight edge.

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C.  Protective Coating

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1.  All coated surfaces both exterior and interior shall be painted
    using a system that conforms to the requirements of \"EEI Proposed
    Finishing Guidelines for Padmounted Equipment,\" Draft 6. The finish
    coat shall be light gray (ANSI Color No. 70).

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D.  

E.  High- and Low-Voltage Compartments

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1.  Terminal compartments shall be full height, air-filled compartments
    with separate hinged doors. The compartments shall be completely
    isolated from each other by a steel barrier without opening or
    discontinuity of any kind.

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21. The edges of the access doors and hoods shall be formed to provide a
    close fitting mating surface, with internal insertion-prevention lip
    that will be shaped to resist entry or prying by screwdrivers,
    wrecking bars, tire irons, single-socket lug wrenches or other
    readily accessible tools.

22. Hinges and hinge pins shall be passivated American Iron and Steel
    Institute Type 304 stainless steel or equivalent corrosion-resistant
    metal.

23. There shall be a threaded fastening device for the high voltage
    door, accessible only through the low voltage compartment. Screen
    door latches with wing nuts and gravity hooks are acceptable. The
    low-voltage compartment door shall have a minimum of three-point
    latching and the handle shall have provisions for padlocking.

> The padlocking provision shall be so designed and located as to resist
> prying or breaking off by screwdrivers, wrecking bars, tire irons,
> single-socket lug wrenches, or other readily accessible tools and to
> inhibit removal of the padlock with a bolt cutting device or hacksaw.

24. In addition to the regular locking provision above, the access doors
    shall be secured by a captive, recessed pentahead bolt as depicted
    in Figure 11, ANSI C57.12.26-1987 (or the latest edition). Bolts and
    associated hardware must be rust and corrosion resistant. The design
    shall minimize the possibility of misalignment and cross threading.
    The design must be such that wire entry through the bolthole into
    the compartment(s) is prohibited when the bolt is removed. The
    non-rotating cup shall be permanently attached.

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a.  The captive pentahead bolt shall be coordinated with the latch and
    padlock to prevent unlatching and insertion of the padlock into the
    hasp when and until the bolt is completely threaded, respectively.

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c.  The captive pentahead shall also function as an interlock device to
    pin the latch closed.

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25. Both compartment doors shall be equipped with stops for holding each
    door in a 90° open position. The stops shall be captive to prevent
    loss of the device.

26. Doors on the high- and low-voltage compartments shall be of
    sufficient size to provide adequate working space when open.

27. The bottom edge of the transformer shall provide for flush mounting
    on a flat rigid surface to prevent wire entry into the high- or
    low-voltage compartments.

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F.  Maximum Size

    Transformer sizes shall not be larger than the "A" and "B"
    dimensions on the transformer pad dimensions shown on Sketch "A".

## 2.09 MANUFACTURER

Padmount transformers manufactured by ABB Company, General Electric,
Cooper Industries or Howard Industries..\`

## 2.10 LOW VOLTAGE BUSHINGS AND TERMINALS

A.  Electrical characteristics of completely assembled low-voltage
    terminations shall comply with Table 3 of ANSI C57.12.26-1987 (or
    the latest edition) unless otherwise stated herein.

B.  All low voltage terminals shall be insulated from the tank with 1.2
    kV class bushings. Terminals of low-voltage windings shall be
    arranged to the specific dimensions shown in Figure 2 and 3 (a) ANSI
    C57.12.22-1989 (or latest edition). In line arrangements are
    unacceptable.

C.  The low-voltage neutral shall be a fully insulated bushing. A ground
    pad shall be provided. A removable copper ground strap shall be
    provided and connected between the neutral bushing and ground pad.
    The ground strap shall be capable of carrying a line to ground fault
    of the magnitude and duration defined in ANSI C57.12.00 (latest
    edition).

D.  Low-voltage terminals shall be 2-hole spades with NEMA hole spacing
    to provide the number of holes given in Table 3.

> [TABLE 3]{.underline}
>
> Secondary Terminals

  ------------------- ------------------- ------- ------- ------- ------- ------- --------
                      [Transformer kVA                                            
                      Size]{.underline}                                           

  Secondary Voltage   75                  150     300     500     750     1000    1500

  208Y / 120          4                   6       6       8       8       8       N/A

  480Y / 277          4                   6       6       6       6       8       8
  ------------------- ------------------- ------- ------- ------- ------- ------- --------

## 2.11 HIGH VOLTAGE BUSHINGS AND TERMINALS

A.  Bushings arrangement for live front, radial feed transformers shall
    comply with the latest revision of ANSI C57.12.22.

B.  High voltage bushings are to be made of wet-process porcelain and
    clamped externally to the wall of the transformer. Reusable nitrite
    rubber gaskets shall seal the bushing to the tank wall in the
    terminals to the porcelain.

C.  Transformer sizes of 75-1500 kVA, shall have 2-hole blade terminals
    with 9/16-in. (14.30 mm) diameter holes, with NEMA hole spacing.

D.  High-voltage cable terminals shall be oriented for vertical take-off
    of primary cables entering the compartment from below in accordance
    with Figure 4, ANSI C57.12.22-1989.

E.  Transformer design shall allow field replacement of high voltage
    bushing wells and low voltage bushings by means of common hand tools
    and oil handling equipment, without totally untanking the
    transformer.

## 2.12 ACCESSORIES

A.  The following accessories are required on all transformers and
    located in the low- voltage compartment in such a manner as to not
    interfere with low-voltage terminals:

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1.  Pressure relief device.

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28. Upper filter valve or plug.

29. One-inch combination drain, lower-filter valve, and sampling device.
    Combination drain plug and sampling device may be substituted.

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B.  The following accessories are required on all transformers rated 500
    kVA and above located in the low-voltage compartments, above
    terminals:

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1.  Liquid level gauge.

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30. Top oil thermometer.

## 2.13 JACKING, ROLLING, LIFTING, AND MOUNTING FACILITIES

A.  Suitable jack bosses or equivalent jacking facilities shall be
    provided on the tank. Vertical clearance for jack shall be 1½ inches
    (38.1 mm) minimum, 3½ inches (88.9 mm) maximum.

B.  Transformer base shall be arranged for rolling in two directions:
    parallel to and at right angles to the centerline of the
    high-voltage bushings.

C.  Lifting lugs shall be adequately strengthened, sized, and arranged
    on the tank to provide a suitable lift for the completely assembled
    unit.

D.  3/4 inch (19.05 mm) minimum and 1½ inch (38.1 mm) maximum integral
    flange shall be provided at the base of the high-voltage and
    low-voltage compartments to provide means of anchoring the unit to
    the pad.

## 2.14 TERMINAL MARKINGS

External terminals on radial feed transformers shall be marked H1, H2,
H3, and X0, X1, X2, and X3 by stenciled white or yellow lettering on the
tank.

## 2.15 INSTRUCTION NAMEPLATE

A.  Instruction nameplate shall be located on the inside of the
    low-voltage compartment door.

B.  Instruction nameplate shall contain the information specified in
    paragraph 5.12 of ANSI C57.12.00-1987 (or latest edition).

C.  Nameplate shall indicate that the transformer oil contained less
    than 1 ppm PCB at time of manufacture.

D.  A winding diagram with high- and low-voltage connections shall be
    shown on the instruction nameplate.

## 2.16 OIL PRESERVATION

Transformers shall be of sealed tank construction, so designed that the
interior is sealed from the atmosphere and the gas plus oil volume
remains constant. The transformer shall remain effectively sealed for
all temperatures to plus 105°C top oil.

## 2.17 TANKS

The tank will be of sufficient strength to withstand a pressure of 7 psi
(48.26 kPa) gage, without permanent distortion.

A.  Welded main cover construction shall be provided. Access to internal
    connection for test purposes shall be provided by means of a hand
    hole, accessible only from the padlocked compartments.

B.  Tank grounding provision shall consist of:

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1.  500 kVA and below - two steel pads, each with a 1/2 inch (12.7 mm)
    13 NC tapped hole, 7/16 inch (11.13 mm) deep.

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31. Above 500 kVA - two unpainted copper-faced steel or stainless-steel
    pads, 2 inches x 3½ inches (50.8 mm x 88.9 mm) each with two holes
    spaced on 1¾ inch (44.45 mm) centers and tapped for 1/2 inch
    (12.7 mm) - 13 NC thread. The minimum thickness of the copper facing
    shall be 0.015 inch (.381 mm). Minimum threaded depth of holes shall
    be 1/2 inch (12.7 mm).

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C.  These ground pads shall be welded on the transformer base or on the
    tank wall near the base, one in the high-voltage compartment and one
    in the low-voltage compartment.

# EXECUTION {#execution .Style1-SECTION1-+-Underline}

NOTE: This section is applicable to the construction contractor
installing the transformer.

## 3.01 INSTALLATION

A.  Transformer shall be installed on a concrete pad as shown on
    contract drawings. Handling of the transformer shall be in
    accordance with manufacturer\'s instructions. Provide a minimum of 5
    feet working clearance in front of doors accessing primary and
    secondary terminations.

B.  Touch up scratched or marred surface to match original finish.

C.  Two-hole compression cable connectors shall be used on the primary
    and secondary cables. They shall be crimped only with the approved
    manufacturer's recommended tool.

D.  The following electrical tests shall be performed prior to
    energization by SNL. The SDR shall be notified to coordinate and
    schedule the electrical testing.

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1.  Perform insulation-resistance tests, winding-to-winding, and
    winding-to-ground \[(high-low and ground) and (low-high and
    ground)\] utilizing a megohmeter with test voltage output as
    follows:

    [Transformer Insulation-Resistance Test Voltages]{.underline}

+----------------------+----------------------+-----------------------+
| Transformer          | Minimum DC           | Recommended Minimum   |
|                      |                      | Insulation Resistance |
| Coil Reading         | Test Voltage         |                       |
|                      |                      | in Megohms            |
+----------------------+----------------------+-----------------------+
| 0 - 600 volts        | 1,000 volts          | 100                   |
+----------------------+----------------------+-----------------------+
| 600 - 5,000 volts    | 2,500 volts          | 1,000                 |
+----------------------+----------------------+-----------------------+
| 5000 - 15,000 volts  | 5,000 volts          | 5,000                 |
+----------------------+----------------------+-----------------------+

32. Perform a turns-ratio test (TTR) between windings at all tap
    positions.

33. Sample insulating oil and perform a dielectric breakdown voltage
    test.

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E.  The following visual and mechanical inspections shall be performed
    on each transformer prior to energization:

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1.  Inspect for physical damage, cracked insulators, leaks, tightness of
    connections, and general mechanical and electrical conditions.

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34. Check tightness of accessible bolted electrical connections.

35. Verify proper liquid level in tank.

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F.  Energization of primary circuits and transformer shall be in
    accordance with Division 16, Section \"Primary System Safety
    Requirements\" and contract drawings.

G.  Upon energization of the transformer, the phase rotation shall be
    verified and secondary voltages measured, line-to-line and
    line-ground, on all phases.

## 3.02 IDENTIFICATION TAGS

All transformers shall have 3¼\" (82.55 mm) high intensity reflective
black on yellow labels, manufactured by \"Electromark\", Catalog \#
Intens - 3.0 - KY - X (where X is the letter or digit ordering). The
labels shall read \"TF-XXXX-Y\"; X will indicate building number and Y
will indicate its number at the building site. Refer to construction
drawings for exact transformer number.

# [EVALUATION]{.underline} {#evaluation .Style1-SECTION1-+-Underline}

## 4.01 LOSS EVALUATION

A.  Transformers bid under this specification will be evaluated for no
    load losses and load losses using the present worth method. Each
    type of loss is associated with a demand charge and an energy
    charge. The present value of carrying charges associated with each
    of the charges are multiplied by the appropriate loss figure
    supplied by the manufacturer for each unit then added to the each
    unit bid transformer price to obtain the total evaluated cost (TEC)
    per unit:

    TEC = T\$ + PVDC x NLL + PVEC x LL; where:

    TEC = Total Evaluated Cost

    T\$ = Unit bid transformer price, \$

    PVDC = Present worth value of demand charges per kilowatt of no load
    losses, \$/KW.

    PVEC = Present worth value of energy charges per kilowatt of load
    losses, \$/KW.

    NLL = Transformer no load losses, KW.

    LL = Transformer load losses, KW.

> Current Values:
>
> PVDC = \$8134.00
>
> PVEC = \$3326.00

B.  In the event actual losses exceed the losses guaranteed, SNL shall
    have the right to either reject the equipment or to accept the
    equipment for a reduced price. The amount due SNL shall be
    calculated as follows:

    Price Reduction = (NLLA - NLLQ) x PVDC +(LLA - LLQ) x PVEC; where:

    NLLA = Actual transformer no load losses, KW.

    NLLQ = Quoted transformer no load losses, KW.

    LLA = Actual transformer load losses, KW.

    LLQ = Quoted transformer load losses, KW.

END OF SECTION 16272

# ATTACHMENT

## SKETCH "A"

Transformer Pad Dimensions

![](media/image1.wmf){width="4.498611111111111in"
height="4.389583333333333in"}

[ENLARGED PLAN VIEW]{.underline}

<table style="width:100%;">
<colgroup>
<col style="width: 9%" />
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<col style="width: 9%" />
<col style="width: 9%" />
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<col style="width: 9%" />
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<col style="width: 9%" />
<col style="width: 9%" />
</colgroup>
<tbody>
<tr class="odd">
<td colspan="11">TRANSFORMER PAD DIMENSIONS</td>
</tr>
<tr class="even">
<td><p>XFMR</p>
<p>kVA</p></td>
<td>Gallon Oil</td>
<td>Total Fluid Vol. Ft<sup>3</sup> (V<sub>c</sub>)</td>
<td>A</td>
<td>B</td>
<td>P</td>
<td>Q</td>
<td>R</td>
<td>S</td>
<td>T</td>
<td>U</td>
</tr>
<tr class="odd">
<td>75</td>
<td>130</td>
<td>34.507</td>
<td>6’-11”</td>
<td>5’-8.5”</td>
<td>1’-1.5”</td>
<td>0’-9.5”</td>
<td>1’-8”</td>
<td>2’-2”</td>
<td>1’-5”</td>
<td>1’-8”</td>
</tr>
<tr class="even">
<td>150</td>
<td>140</td>
<td>36.319</td>
<td>6’-11”</td>
<td>5’-10”</td>
<td>1’-1.5”</td>
<td>0’-9.5”</td>
<td>1’-8”</td>
<td>2’-2”</td>
<td>1’-5”</td>
<td>1’-8”</td>
</tr>
<tr class="odd">
<td>300</td>
<td>185</td>
<td>44.139</td>
<td>7’-4”</td>
<td>6’-3.5”</td>
<td>1’-1.5”</td>
<td>0’-9.5”</td>
<td>1’-4.5”</td>
<td>2’-2”</td>
<td>1’-5”</td>
<td>2’-0.5”</td>
</tr>
<tr class="even">
<td>500</td>
<td>185</td>
<td>46.111</td>
<td>7’-8”</td>
<td>6’-5.5”</td>
<td>1’-1.5”</td>
<td>0’-9.5”</td>
<td>2’-1/2”</td>
<td>2’-2”</td>
<td>1’-5”</td>
<td>2’-0.5”</td>
</tr>
<tr class="odd">
<td>750</td>
<td>380</td>
<td>73.993</td>
<td>8’-0”</td>
<td>7’-0.5”</td>
<td>1’-1.5”</td>
<td>0’-9.5”</td>
<td>2’-0”</td>
<td>2’-3”</td>
<td>2’-2”</td>
<td>1’-6.5”</td>
</tr>
<tr class="even">
<td>1000</td>
<td>400</td>
<td>78.917</td>
<td>8’-0”</td>
<td>8’-5.5”</td>
<td>1’-1.5”</td>
<td>0’-9.5”</td>
<td>1’-4”</td>
<td>2’-11”</td>
<td>2’-2”</td>
<td>1’-6.5”</td>
</tr>
<tr class="odd">
<td>1500</td>
<td>490</td>
<td>95.431</td>
<td>8’-6”</td>
<td>8’-8.5”</td>
<td>1’-1.5”</td>
<td>0’-9.5”</td>
<td>1’-8”</td>
<td>3’-0”</td>
<td>2’-3”</td>
<td>1’-7”</td>
</tr>
</tbody>
</table>