contract price.
b.
If D is greater than C: A unilateral contract modification will be
issued in the amount of difference between C and D.
c.
If D is greater than 1.25(C):
The transformer is unacceptable.
]2.2.3.6
Insulating Liquids
[a.
Mineral oil: ASTM D 3487, Type II, tested in accordance with ASTM D
117. Provide identification of transformer as "non-PCB" on the
nameplate.]
[b.
Less-flammable transformer liquids: NFPA 70 and FM P7825 for
less-flammable liquids having a fire point not less than 300 degrees C
tested in accordance with ASTM D 92 and a dielectric strength not less
than 33 kV tested in accordance with ASTM D 877. Do not provide askarel
or insulating liquids containing polychlorinated biphenyls (PCB's),
tetrachloroethylene (perchloroethylene), chlorine compounds, and
halogenated compounds.
[1.
Silicone compatibility tests: When silicone is used as a
less-flammable transformer liquid, compatibility of silicone with
seals and gasketing materials in oil-immersed type tap changers
shall be determined by compatibility tests conducted in accordance
with ASTM D 3455. Test results shall show no evidence of
shrinkage, swelling, or absorption caused by the liquid.]]
2.2.4
Secondary Transition[ and Auxiliary] Section(s)
The secondary transition[ and auxiliary] section(s) shall have a hinged
front panel, a [_____]-ampere, three-phase, [three][four]-wire[ insulated]
main bus and connections, a ground bus, necessary terminal blocks, wiring
and control buses, control power transformer, and cable supports.[ In the
auxiliary section provide a [_____]-V battery complete with rack and
standard accessories, and a battery charger, static type, [without voltage
regulation][with automatic charger control], complete with ammeter,
voltmeter, and rheostat.]
2.2.4.1
Control Power Transformers
Transformers shall be designed for continuous operation at rated kVA 24
hours a day, 365 days a year with normal life expectancy as defined in IEEE
C57.96. Dry-type, two-winding type, 115 degrees C rise above 40 degrees C
maximum ambient designed for mounting in switchgear cubicle or drawer.
Transformer shall be sized as required to serve the connected load and
shall have a voltage rating of [_____] kV three-phase, delta primary, and
[120/208][277/480] V wye secondary, 60 Hz.
2.2.4.2
Primary Protection
Provide drawout-mounted, primary current limiting fuses rated for the
specified transformer size and the available short-circuit current.
2.2.4.3
Secondary Protection
Provide molded-case circuit breakers or molded-case switch sized as
required, mounted in same compartment with transformer and primary fuses to
serve the indicated loads.
SECTION 16361N
Page 22
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