55/65 degrees C rise, three-phase, two-winding, mineral-oil-immersed,
[load-tap-changing type] and shall be [solidly grounded] [resistance
grounded through its associated neutral grounding resistor specified
below]. [The oil preservation system shall be either of the sealed-tank,
inert-gas-pressure system as defined in IEEE C57.12.80, or
conservator/diaphragm type]. Temperature monitoring, indication, and
automatically-controlled cooling equipment shall be as specified. The
color of the transformer case and auxiliary items shall match the color
used for switchgear and cabinets as specified for cabinets in paragraph
CABINETS AND ENCLOSURES.
2.6.1.1
Ratings
**************************************************************************
NOTE: Standard ratings are listed in ANSI
C57.12.10. Refer to TM 5-811-1/AFM 88-9 Chapter 1
for guidance regarding transformer losses.
Coordinate with paragraph FACTORY TESTS. Delete
loss requirement when not needed.
**************************************************************************
Transformer losses and impedances shall be measured in accordance with IEEE
C57.12.90. Ratings at 60 Hz shall be in accordance with ANSI C57.12.10 and
as follows:
High-voltage winding.................................[_____] volts
High-voltage BIL.....................................[_____] volts
High-voltage winding connection......................[_____]
Low-voltage winding..................................[_____] volts
Low-voltage BIL......................................[_____] volts
Low-voltage winding connection.......................[_____]
Base kVA.............................................[_____]
Percent impedance range..............................[_____] to
[_____]
Maximum no-load (core) losses........................[_____]
Maximum full-load (winding) losses...................[_____]
2.6.1.2
Auxiliary Cooling Equipment
[Cooling] [Provision for future cooling] equipment shall be provided for
[single-stage, forced-air-cooling] [two-stage,
forced-air-cooling/forced-air-cooling] [or] [forced-air-cooling/forced-oil
cooling] utilizing automatic control. Automatic controls, motors, heaters,
and their protective devices shall be rated for the application and shall
be suitable for the alternating current available as shown or specified.
Radiator isolation valves shall be provided for bolted-on radiators.
Controls for auxiliary cooling equipment shall combine the transformer top
oil thermometer, device 26Q, and the transformer winding temperature
simulator, device 49, suitable for responding either to the transformer's
top liquid or winding temperature, and shall include auxiliary devices
SECTION 16311A
Page 34
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