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Equipment Description
01.4IB.67000
This instruction bulletin should be used in
conjunction with the appropriate instructions
for Vacuum Circuit Breakers, including any
applicable supplement(s), separate instructions
covering other components of the
metal-clad switchgear, and applicable
drawings because each metal-clad switchgear
line-up is custom designed for a particular
use and application. Separate instructions
covering other components are not included in
this publication, but are available upon request.
B. PRIMARY COMPARTMENT
The primary compartment contains the
high voltage equipment and connections. It
consists of the breaker compartments, bus
compartment, cable termination compartment,
and auxiliary compartments for voltage and
control power transformers. Each of these
compartments is separated from the others by
metal barriers for reliability and safety.
Interference interlocks are provided on the
metal-clad switchgear to permit only the circuit
breaker with the correct voltage, continuous
current, MVA and momentary rating to be
inserted.
Ch 3 Equipment Description
A. GENERAL
Powell is committed to continuous product
improvement. It is possible that improvements
occurred between revisions to this document
and therefore, may not be described in these
instructions. If the equipment does not
resemble the photographs and descriptions
contained herein, do not attempt to perform
the actions. Contact the Powell Service
Division.
Power/Vac® Metal-Clad Switchgear equipped
with vacuum circuit breakers is designed to
comply with ANSI Standard C37.20.2.
Metal-Clad switchgear is characterized by
removable interrupting devices, isolation
of major circuit elements, grounded metal
compartments, and insulated primary bus
conductors. The metal-clad switchgear is a
line-up of one or more switchgear vertical
sections known as units, which are enclosed
on all sides except for the ventilation openings
and lower unit cable penetrations.
The metal-clad switchgear is used to protect
and control medium voltage alternating
current power distribution systems. Each
unit consists of a number of circuit breaker
compartments, plus auxiliary compartments
containing accessory apparatus. The circuit
breakers are used to control various types
of circuits, such as incoming lines, bus ties,
feeders, and motor starters. Also, special
functions are provided in great variety and may
be required for particular applications.
Figure 1 illustrates a typical Power/Vac
metal-clad switchgear line-up.
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