a.
Current transformers: Transformers shall be [multi-ratio][ or ][single
ratio] as indicated, 60 Hz, and coordinated to the rating of the
associated switchgear, relays, meters, and instruments.
b.
Potential transformers: Transformers shall be drawout type, 60 Hz,
with voltage ratings and ratios coordinated to the ratings of the
associated switchgear, relays, meters, and instruments. Potential
transformers shall be with [one fuse][two fuses] in the primary. Fuses
shall be current limiting and sized as recommended by the potential
transformer manufacturer.
2.2.6.8
Heaters
Provide 120-volt heaters in each switchgear section. Heaters shall be of
sufficient capacity to control moisture condensation in the compartments,
and shall be sized 250 watts minimum. Heaters shall be controlled by a
thermostat[ and humidistat] located inside each section. Thermostats shall
be industrial type, high limit, to maintain compartments within the range of
15 to 32 degrees C 60 to 90 degrees F.[ Humidistats shall have a range of
30 percent to 60 percent relative humidity.] Provide transformer rated to
carry 125 percent of heater full load rating. Transformers shall have 220
degrees C insulation system with a temperature rise not exceeding 115
degrees C and shall conform to NEMA ST 20. Provide panelboard and circuit
breakers in each switchgear assembly to serve the heaters in that
switchgear assembly. Energize electric heaters in switchgear assemblies
while the equipment is in storage or in place prior to being placed in
service. Provide method for easy connection of heater to external power
source.
2.2.6.9
Pilot and Indicating Lights
Provide transformer, resistor, or diode type.
2.2.7
Station Batteries and Charger
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NOTE: For SOUTHNAVFACENGCOM projects, specify
maintenance-free sealed batteries only.
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Provide station batteries and charger, suitable for the requirements of the
switchgear and [vacuum][SF6] circuit breakers. Batteries shall be [_____]
V, 60 cells, lead-acid, [pasted plate type][ or ][sealed, totally absorbed
electrolyte type].
a.
Pasted plate type batteries: Positive plates shall be of the
manchester type and negative plates shall have a life equal to or
greater than the positive plates. Battery containers shall be heat and
impact resistant clear plastic with electrolyte level lines permanently
marked on all four sides. A permanent leakproof seal shall be provided
between cover and container and around cell posts. Sprayproof vent
plugs shall be provided in covers. Sufficient sediment space shall be
provided so that the battery will not have to be cleaned out during its
normal life. High porosity separators to provide correct spacing
between plates shall be provided. Capacity shall be calculated by
switchgear manufacturer and approved by Contracting Officer before
acceptance.
SECTION 16361N
Page 30
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