2.5
INCOMING SWITCHING/CIRCUIT INTERRUPTING EQUIPMENT
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NOTE: Incoming line equipment may be provided by
the utility or by the Government. Delete paragraphs
not applicable to project. Operating
characteristics and ratings of incoming line
interrupting/switching shall be coordinated with the
requirements of the serving utility and the
transformer and bus protection requirements. On the
drawings, identify the required instruments, relays,
instrument transformers, and controls for each
switching/interrupting unit, and modify the
following paragraphs to reflect the station control
and instrumentation schemes and the station
single-line diagram.
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Incoming line switching equipment shall be of the outdoor weatherproof
type. Operating characteristics and ratings of incoming line switching
equipment shall be as indicated.
2.5.1
Metal-Enclosed Interrupter Switchgear
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NOTE: Metal enclosed switchgear with SF6
interrupters is available for voltage levels of 5 kV
through 25 kV. Select either air-insulated,
vacuum-insulated, or SF6 interrupters.
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Metal-enclosed interrupter switchgear shall comply with IEEE C37.20.2 for
metal clad switchgear, NEMA SG 6 for switchgear, ANSI C37.32for
load-interrupter switches, [_____] for power fuses, and shall be of the
outdoor no-aisle type that meets or exceeds the requirements of applicable
publications listed. Switch construction shall be of the
manually-operated, "OPEN-CLOSED," [air-insulated, load-interrupter type]
[vacuum-insulated, load-interrupter type] [SF6-insulated, load-interrupter
type], equipped with a stored energy operator for quick-make-quick-break to
make operating speeds independent of manual switch operations. Where
indicated, bus or lug connections to mount field-installed, slip-on,
medium-voltage cable terminations for cable entering from below [and a
flanged throat for direct connection to the associated transformer] [and a
bus throat for connection to the associated metal-enclosed bus] [and roof
bushings for aerial line connections] shall be provided. [Roof bushings
shall [have the same BIL as] [be one BIL higher than] the associated
switchgear and shall conform to IEEE C57.19.00 and IEEE C57.19.01 when
bushings are rated at or above 110 kV BIL.] Primary buses shall comply
with the requirements for buses in paragraph OUTGOING METAL-CLAD SWITCHGEAR.
2.5.1.1
Ratings
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NOTE: Preferred ratings are listed in IEEE C37.2,
Table 6. A short-circuit study is required to
specify ratings. For projects where multiple
ratings are required for different applications,
delete the table below and provide rating
requirements on the drawings in tabular form.
SECTION 16311A
Page 23
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