Section 5: Description And Operation; Introduction; Interrupter Assembly; Plate Over Rear Truck Opening 2000A Breakers And Above (Vcp-W Shown) - Eaton 380 VCP-W 16 Instructions For Installation, Operation And Maintenance

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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
extension of existing switchgear. The Type VCP-WR
Vacuum Circuit Breaker is a fixed design, with the
customer responsible for all required interfaces and
barriers. Either design is for use in new switchgear, as
well as for modernization and life extension of existing
switchgear. The circuit breakers meet or exceed all
applicable ANSI and IEEE Standards.
Circuit breakers are 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-aligning, silver plated copper. VCP-W Circuit
Breakers are of a modular type construction containing
a front accessible mechanism with unobstructed access
to control components. 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
Figure 5-1 Rear View Showing Pole Unit Enclosure
(VCP-W Shown)
cross-linked polyolefin insulation is used throughout
the control circuits with all terminals being of the
screw type. 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 and VCP-WR 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
conductors.
The rear portion of the circuit breaker, 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 breakers (Figure 5-2).
Figure 5-2 Plate Over Rear Truck Opening 2000A
Breakers and Above (VCP- W Shown)
I.B. 3A74792H08
Effective
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