Eaton 150 VCP-TL16, Инструкция по использованию, эксплуатации и обслуживанию

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Instruction Book
Effective: May 2016 Page 31
IB131017EN For more information visit: www.Eaton.com
SECTION 5: DESCRIPTION AND OPERATION
5-1 INTRODUCTION
The
VCP-TL
vacuum circuit breaker is a drawout device
while the
VCP-TRL
circuit breaker is a fixed mounted
device. The
VCP-TL
drawout circuit breaker is comprised
of two parts. The upper circuit breaker element, much like
the fixed
VCP-TRL
circuit breaker element and a lower
portion called the cradle. The cradle primarily provides the
levering mechanism for moving the circuit breaker into and
out of the CONNECTED position. They are designed, tested
and in accordance with ANSI Standards C37.04, C37.09
and C37.20.2. The ratings are shown in Table
1.1.
The circuit breakers utilize a linear actuator mechanism,
capable of up to 100,000 operations due to the small
number of moving parts. A high degree of service continuity
is provided by the open-close open (O-CO) circuit breaker
duty cycle. A wide range of AC and DC control voltages are
available:
Low
36-60 Vac, 36-72 Vdc and High 100-240
Vac, 100-353Vdc (Figure 5-2 ).
VCP-TL
and
VCP-TRL
circuit breakers are true metal-clad
circuit breakers encompassing all the features normally
associated with a true metal-clad design, such as:

Insulation and isolation of compartments

1 1 gauge grounded steel safety barrier between primary
and mechanism compartments
Figure 5-1 Typical Rigid Frame Construction
The circuit breakers utilize a rigid frame construction of
engineered thermoset composite resins with a patented pole
unit molding. In addition to high strength structural
properties, the material used has excellent dielectric
characteristics and resists tracking (Figure
5-1 ) .
The fixed type
VCP-TRL
circuit breaker element uses cop-
per primary conductors with silver plated joints. Upper and
lower conductors have two holes for making bolted
horizontal bus or cable connections. Secondary
connections can be made through a standard secondary
disconnect block or an optional screw type terminal block
supplied in kit form.
The drawout
VCP-TL
circuit breakers utilize spring loaded
finger disconnects to make its primary connection. The
number of individual silver plated fingers that make up a
finger cluster depends upon the current rating of the circuit
breaker. The circuit breaker finger disconnects mate with
rigidly mounted, silver plated stabs mounted in the rear
portion of the cassette.
Controls and indicators, common to all ratings, are
functionally grouped on the front of the circuit breaker. The
front escutcheon (faceplate) is also common for all voltage
and current ratings. A mechanical operations counter is
provided as standard on all circuit breakers.
VCP-TL
drawout type and
VCP-TRL
fixed type circuit
breakers are supplied as standard with a front mounted 5a,
5b auxiliary switch for customer use. The switch is a heavy
duty, double break type switch with wipe We contacts.
5-2 VACUUM INTERRUPTER ASSEMBLY
All
VCP-TL
and
VCP-TRL
circuit breakers utilize
vacuum interrupters for interruption and switching functions
(Figures
5-3 and 5-4 ). Vacuum interruption offers the
advantages of enclosed interrupters, reduced size and
weight, short interrupting time, long life, reduced
maintenance, and environmental compatibility.
WARNING
DO NOT PLACE ANY CIRCUIT BREAKER IN SERVICE
WITHOUT ITS SUPPLIED HORIZONTAL AND
VERTICAL BARRIERS, IF SO SUPPLIED, BEING
PROPERLY IN PLACE. FAILURE TO COMPLY WITH
THIS WARNING CAN CAUSE A CATASTROPHIC
FAILURE RESULTING IN DEATH, SEVERE PERSONAL
INJURY AND PROPERTY/EQUIPMENT DAMAGE.
The vacuum interrupters are mounted vertically and sup-
ported from the fixed stem connected to the top conductor.
A patented pole unit molding encloses each of the vacuum
interrupter assemblies on three sides and provides the
required mounting means, insulation, isolation, strength
and rigidity. Certain
VCP-TL
and
VCP-TRL
circuit
breakers are supplied with vertical and horizontal barriers
already in place and are required to be in place before the
circuit breaker is put into service (Figures
3-4 and 3-6 ).
Other barriers may also be required in keeping with
paragraph
4-3.