Voltage regulators shall comply with IEEE C57.15 and shall be of the
outdoor, self-cooled, 55/65 degrees C temperature rise, single-phase type.
Windings and the load-tap-changing mechanism shall be mineral-oil-immersed.
When operating under load, a regulator shall provide plus and minus 10
percent automatic voltage regulation in approximately 5/8 percent steps,
with 16 steps above and 16 steps below rated voltage. Automatic control
equipment shall provide Class 1 accuracy. Bypass surge arresters shall be
suitable for [a grounded] [an ungrounded] system and for the associated
regulator voltage. [[Station] [Intermediate] class surge arresters shall
be mounted next to each incoming line bushing on a regulator tank-mounted
bracket and connected to a surge arrester ground pad-mounted on the
regulator tank.]
2.17.1
Ratings
Ratings at 60 Hz shall be
Maximum voltage...........................................[_____]
Basic Insulation Level (BIL)..............................[_____]
Current...................................................[_____]
2.17.2
Bypass and Isolation Switches
Switches shall be of the outdoor, stickhook-operated, single-pole,
single-throw, vertical-break type suitable for the indicated mounting.
Switches shall be of a type designed to provide bypass of a single-phase
regulator circuit by an integral sequence which always occurs when each
switch is opened or closed. Each opening sequence shall initially bypass
the single-phase regulator circuit, then open the input and output
circuits, and finally interrupt the exciting current. Opening any
single-phase regulator circuit shall not be possible until after the bypass
circuit is closed. Ratings at 60 Hz shall be in accordance with IEEE C37.41
and as follows:
Maximum voltage...........................................[_____]
Nominal voltage class.....................................[_____]
BIL.......................................................[_____]
Momentary asymmetrical current in the closed position.....[_____]
Momentary asymmetrical current in the bypass position.....[_____]
Continuous and interrupting current.......................[_____]
2.17.3
Miscellaneous
Standard accessories and components in accordance with IEEE C57.15shall be
provided. Single-phase units shall be provided with additional components
and accessories required by IEEE C57.15 for three-phase units.
2.18
GROUNDING AND BONDING
2.18.1
Driven Ground Rods
Ground rods shall be of [copper-clad steel conforming to UL 467]
SECTION 16370A
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