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Page 16
SECTION 5: DESCRIPTION AND
OPERATION
5-1 INTRODUCTION
The Type VCP-W 38kV Vacuum Circuit Breaker is a
horizontal drawout roll on the floor design for use in new
switchgear, as well as for modernization and life exten-
sion of existing switchgear. VCP-W 38kV Circuit Break-
ers meet or exceed all applicable ANSI and IEEE Stan-
dards.
The circuit breaker is operated by a motor charged
spring type stored energy mechanism, charged normally
by an electric motor or manually by a manual charging
tool. The primary disconnecting contacts are self-align-
ing, silver plated copper. VCP-W Circuit Breakers are of
a modular type construction containing a front accessible
mechanism with unobstructed access to control compo-
nents. Self-contained vacuum interrupter pole unit
assemblies are removable as complete individual units.
The primary insulation used in the circuit breaker design is
cycloaliphatic epoxy. Type SIS, AWG #14 control wire with
cross-linked polyolefin insulation is used throughout the
control circuits with all terminals being of the screw type.
Figure 5-1 Rear View Showing Pole Unit Enclosure
This section describes the overall operation of the circuit
breaker as well as the function and operation of all
major sub-assemblies and/or parts.
5-2 INTERRUPTER ASSEMBLY
The VCP-W 38kV design utilizes three individually
mounted and removable pole units. Each pole unit is
enclosed in a four sided continuous chimney type
cycloaliphatic epoxy support molding. Black insulating
shrouds cover and seal the openings where upper and
lower primary conductors enter and exit the cycloali-
phatic epoxy enclosure (Figure 5-1). The disconnecting
ends of the primary conductors utilize round, floating
type primary disconnecting finger clusters for interfacing
with the switchgear structure mounted primary conduc-
tors.
The rear portion of the circuit breaker truck, on which
the pole units are mounted, utilizes a bolted on plate to
cover a rectangular opening in the truck for circuit
breakers above 1600 amperes. Closure of the opening
provides for proper air circulation up through each pole
unit enclosure on 2000 ampere and above circuit break-
ers (Figure 5-2).
Figure 5-2 Plate Over Rear Truck Opening 2000A
Breakers and Above
I.B. 3A74792H04
Effective 7/97
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