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Transformers shall have two separate windings per phase and shall be of the
[mineral oil-insulated] [less-flammable, liquid-insulated] type with [high
molecular-weight hydrocarbon] [or] [dimethyl silicone] liquid.
Transformers shall be suitable for outdoor use. Liquid-insulated
transformers shall comply with IEEE C57.12.00, and shall have two 2-1/2
percent full capacity taps above and two 2-1/2 percent full capacity taps
below rated voltage. Transformers shall be of the sealed tank type
construction with welded-on cover.
High-voltage terminals shall be
provided [in an air terminal chamber for incoming [top] [bottom] entry
cables][for direct connection to the incoming line section] [as shown on
the drawings]. Low-voltage terminals shall be provided [in an air terminal
chamber for incoming [top] [bottom] entry cables] [for direct connection to
the outgoing [switchgear section] [bus duct]] [as shown on the drawings].
Low-voltage terminals shall be [on the [left] [right]] [as shown on the
drawings] when facing the front, accessory side of the transformer.
[Transformers shall be equipped with forced air cooling equipment to give
[_____] kVA capacity. The equipment shall include the necessary fans,
conduit and wiring, motor starters, and top liquid thermometer for fan
control.] [Provision shall be made for the future addition of forced air
cooling equipment to give [_____] kVA capacity. The transformer bushings,
leads, and other components shall be designed to carry the increased load.
A top liquid thermometer for control of future fans shall be furnished.
Provision for future mounting of fans, conduit, and terminal box shall be
provided.] Transformer accessories and ratings at 60 Hz shall be as follows:
Three-phase capacity, self-cooled.....................[_____] kVA.
Three-phase capacity, (future) forced-cooled..........[_____] kVA.
Impedance..[5.75 percent, standard] [[_____] percent nonstandard].
Temperature rise.................[65 degrees C] [55/65 degrees C].
High-voltage winding................................[_____] volts.
High-voltage winding connection...........................[_____].
Low-voltage winding.................................[_____] volts.
Low-voltage winding connection............................[_____].
Accessories:
a.
drain and filter connection.
b.
filling and top filter press connection.
c.
pressure-vacuum gauge.
d.
dial type thermometer with alarm contacts.
e.
magnetic liquid level indicator with high and low level alarm
contacts.
f.
pressure relief device with alarm contacts.
g.
ground connection pad.
SECTION 16375A
Page 29
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