IEEE C37.20.3 for metal-enclosed [air][vacuum][SF6] load interrupter type
switches, insulated for [5][15][27] kV for use on [_____] kV system. The
metal-enclosed switchgear assembly shall consist of individual,
factory-assembled, freestanding modular units, each with provisions for
bolt-together installation. Modules shall have uniform dimensions,
constructed of rigidly braced 14-gage steel with a durable
corrosion-resistant finish. Units shall include a removable front panel,
capable of being locked, for access to cable connections and fusing,
internal venting for air circulation, lifting/mounting provisions and
centralized, front facing controls[ with mimic bus line diagram] and
identification nameplates. Modules shall allow incoming/outgoing cable
entry from the bottom, sides or rear with adequate access for training and
connection of cable using lugs and indoor terminations. Modular units
shall include necessary provisions for future expansion with removable end
covers and extendable high-conductivity copper main and ground bus
interconnections. Main bus shall be fully insulated and mounted on
insulated supports of high-impact, non-tracking, high-quality insulating
material. Bus shall be braced to withstand the mechanical forces exerted
during short-circuit conditions when connected directly to a source having
maximum of [_____] amperes rms symmetrical available. Phase bus bars shall
be rated [_____] amperes. Ground bus shall be sized for full short-circuit
capacity and shall include provisions for external ground connections.
Enclosures shall be designed for [indoor][outdoor] location and shall
conform to Category [A][B] requirements of Table A1 of Appendix A to IEEE
C37.20.3. Provide permanent labels for wiring and terminals corresponding
to the designations on approved shop drawings. A safety glass window shall
be provided in the door panel in front of each interrupter switch to
observe its position.
[2.2.8.1
Air-Insulated Load Interrupter Switches
**************************************************************************
NOTE: Choose this paragraph or one of the
subparagraphs below entitled, "SF6-Insulated Load
Interrupter Switches" or "Vacuum-Insulated Load
Interrupter Switches."
**************************************************************************
Load interrupter switches shall be three-pole, gang-operated,
[fused][non-fused], arranged with hinge end of switch on load side to
provide for "dead blade."[ Fuses shall be located on hinge side of
switch.] Switch handles shall be non-removable, operable from front of
cubicle. Switch shall be equipped with stored-energy, quick-make and
quick-break device to operate the switch independent of the handle or power
operator speed. Load interrupter switches shall be rated at [600][1200]
amperes continuous, 61 kA momentary, 38 kA short-time fault closing.
Switches shall be [manual handle operated "close" and "open"][manual handle
operated "close" and remote operated "open" by electrical release
device][power operated "close" and "open" utilizing motor charged closing
spring mechanism and electrical release device].
][2.2.8.2
SF6-Insulated Load Interrupter Switches
SF6 filled, puffer-type load interrupter switches shall be [fused][ or
][non-fused] as indicated. Switches shall incorporate self-aligning,
copper-silver plated, wiping-type contacts. SF6 puffer interrupters to
minimize arcing during operation; and an internal absorbent to neutralize
arc by-products. Switch contacts shall be enclosed and sealed in
SECTION 16361N
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