Page 22
I.B. 3A74792H08
Effective
09/2014
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)
Содержание 380 VCP-W 21
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Страница 13: ...I B 3A74792H08 Page 7 Effective 09 2014 ...
Страница 19: ...I B 3A74792H08 Page 13 Effective 09 2014 Figure 3 4 Front View VCP W 38kV Drawout Vacuum Circuit Breaker ...
Страница 21: ...I B 3A74792H08 Page 15 Effective 09 2014 Figure 3 6 Rear View VCP W 38kV Drawout Vacuum Circuit Breaker ...
Страница 22: ...Page 16 I B 3A74792H08 Effective 09 2014 Figure 3 7 Typical VCP W 38kV Escutcheon ...
Страница 23: ...I B 3A74792H08 Page 17 Effective 09 2014 Figure 3 8 Typical VCP W 38kV Escutcheon ...
Страница 33: ...I B 3A74792H08 Page 27 Effective 09 2014 compartment Figure 5 5 Charging Schematic ...
Страница 34: ...Page 28 I B 3A74792H08 Effective 09 2014 Figure 5 6 Typical VCP W DC and AC Control Schematics Drawout ...
Страница 35: ...I B 3A74792H08 Page 29 Effective 09 2014 Figure 5 7 Typical VCP WR DC and AC Control Schematics Fixed ...
Страница 38: ...Page 32 I B 3A74792H08 Effective 09 2014 Figure 5 10 Undervoltage Trip Device Configuration ...
Страница 41: ...I B 3A74792H08 Page 35 Effective 09 2014 Figure 6 1 Lubrication Points Drawout Circuit Breaker Shown ...
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Страница 62: ...Page 56 I B 3A74792H08 Effective 09 2014 Style 3A74792H08 Printed in USA ...