3.2.1
Transformer Stations
Transformer stations shall be installed in accordance with IEEE C57.93 and
shall be fence-enclosed type and mounted on concrete pads. Three-phase
transformer installations shall be installed with [_____] phase sequence.
Primary taps shall be set in accordance with the coordination study.
3.2.2
Equipment Finishes
Equipment shall be carefully installed so as not to scratch finishes.
After installation, finished surfaces shall be inspected and scratches
touched up with a finish provided by the manufacturer especially for this
purpose.
3.2.3
Supports
Enclosures and enclosure supports shall be installed in accordance with
manufacturer's instructions. Supports shall consist of anchored channels
leveled and then embedded in the concrete foundation. Channels, anchors,
shims, or other leveling items shall be installed in accordance with the
recommendations of the equipment manufacturer.
3.2.4
Switchgear Leveling
After leveling items are correctly installed, switchgear lineups shall be
out-of-plumb by not more than 6 mm 1/4 inch for the entire length and
width. Insertion or withdrawal of removable elements shall be easily
accomplished, and component devices shall operate properly after the
switchgear assembly is completely installed.
3.2.5
Incoming Line Surge Arresters
Surge arresters of the [station] [intermediate] type shall be provided on
each phase of each incoming line circuit, and mounted on station structures
as shown.
3.2.6
Transformer Surge Arresters
Surge arresters of the [station] [intermediate] type, suitable for [a
grounded] [an ungrounded] system and for the associated transformer primary
line-to-ground voltage, shall be mounted next to each high-voltage bushing
on a transformer tank-mounted bracket and connected to a surge arrester
ground pad. Discharge counters shall be provided and mounted on the
brackets.
3.3
ELECTRICAL BUS CONNECTIONS
All connections to aluminum bus shall be cleaned and coated with an
inhibiter in accordance with manufacturer's recommended methods. All
bolted connections shall be torqued to the correct tightness. The
Contractor shall establish a checklist to insure that bolted connections
have been properly coated and correctly torqued. All welded connections on
aluminum buswork shall be by the gas metal-arc welding process. The shield
inert gas shall be argon. The welder shall be certified for gas metal-arc
welding.
3.4
GROUNDING
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SECTION 16311A
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