47
Instruction Booklet
IB131006EN
Effective March 2019
Instructions for installation,
operation, and maintenance of type
VCP-W vacuum circuit breakers
EATON
www.eaton.com
5.5 Interlocks and interfacing
Refer to Paragraph 4.9 of this manual for detailed information
concerning circuit breaker interlocks and their interfacing with a
switchgear structure compartment. In addition, refer to the instruc-
tion manual supplied with the switchgear assembly.
5.6 Levering mechanism
BPI pan assembly:
(Figure 12)
The purpose of the levering device is to move the circuit breaker
between the DISCONNECT, TEST, and CONNECTED positions. For
Type VCP-W circuit breakers, the device is a racking screw, racking
nut, and moving block.
Although the device is mounted in the switchgear compartment, a
brief description here will help understand the operation
(Figures 12
and 15). F
or additional information on the insertion and removal of a
circuit breaker from its compartment, refer to paragraph 4.8.1 in this
manual.
The levering device consists of a racking screw, a racking nut,
moving block, two side rails, and a slider. In the DISCONNECT
position, the moving block is all the way to the front of the racking
screw. As the circuit breaker is pushed into the breaker cell, the
levering latch snaps on the moving block. In this position the front
cover of the breaker will be aligned with the black line associated
with the green area of the label. In order to turn the racking nut,
push on the slider with the levering-in crank until fully engaged.
Turning the levering-in crank clockwise while still pushing forward
on the slider advances the circuit breaker toward the TEST (approxi-
mately six full turns) position. In this position, the front cover of the
breaker will be aligned with the black line associated with the yellow
area of the label. During this travel, the trip floor tripper is lifted
up holding the circuit breaker trip free. When the circuit breaker
reaches the TEST position, the breaker can be closed. Turning the
levering-in crank clockwise while pushing forward advances the
circuit breaker toward the CONNECT position.
Rotate the levering-in crank in a clockwise direction until the torque
limiter on the levering-in crank “breaks free.” As a position verifica-
tion:
•
BPI pan assembly:
the breaker cover plate MUST align with the
black line associated with the CONNECTED position, location
shown on the BPI label (Figure 12, item 7).
If the circuit breaker is closed in the CONNECTED position, the
slider can be pushed forward to permit engagement of the levering-
in crank which will trip the breaker by pushing up on the trip floor
tripper. This functionality is enabled by the “L” shaped slider inter-
lock.
The breaker can be moved to the TEST position by pushing forward
on the levering-in crank and turning the racking screw counterclock-
wise until the breaker reaches the TEST position.
The breaker can be moved to the DISCONNECT position by pushing
forward on the levering-in crank and turning the racking screw coun-
terclockwise until the breaker reaches the DISCONNECT position
(approximately six full turns).
The circuit breaker levering latch can be disengaged only when the
circuit breaker is in the DISCONNECT position by lifting the lift/pull
handle. As the circuit breaker is withdrawn, it comes out with the
contacts open and the springs discharged because of the close floor
tripper and trip floor tripper interlocks.
Non-BPI pan assembly
:
(Figure 13)
The purpose of the levering device is to move the circuit breaker
between the TEST and CONNECTED positions. For Type VCP-W
circuit breakers, the device is a racking screw, racking nut, and
moving block.
Although the device is mounted in the switchgear compartment, a
brief description here will help understand the operation
(Figures 13
and 15
). For additional information on the insertion and removal of a
circuit breaker from its compartment, refer to paragraph 4.8.1 in this
manual.
The levering device consists of a racking screw, a racking nut,
moving block, two side rails, and a slider. In the TEST position, the
moving block is all the way to the front of the racking screw. As
the circuit breaker is pushed into the breaker cell, the levering latch
snaps on the moving block. In order to turn the racking nut, push
on the slider with the levering-in crank until fully engaged. Turning
the levering-in crank clockwise while still pushing forward on the
slider advances the circuit breaker toward the
CONNECTED
position.
During this travel, the Trip Floor Tripper is lifted up holding the circuit
breaker trip free. When the circuit breaker reaches the CONNECTED
position, the levering-in crank will “spin-free” and cannot advance
the breaker any further. A red flag indicates that the circuit breaker
is fully engaged.
If the circuit breaker is closed in the CONNECTED position, the
slider cannot be pushed forward to permit engagement of the
levering-in crank due to the “Z” shaped slider interlock.
After tripping the circuit breaker, push on the slider with the levering-
in crank until fully engaged. Turning the levering-in crank clockwise
while still pushing forward on the slider advances the circuit breaker
toward the DISCONNECT position. This position is indicated by no
further motion of the crank and by the green flag indicating that the
circuit breaker has reached the TEST position
Automatic/manual hybrid secondary
(optional -
Figure 46
): It will
function the same as the Non-BPI pan assembly above due to the
replacement of the “L” bracket with the “Z” bracket.
5.7 Operations counter
All circuit breakers are equipped with a mechanical operations
counter. As the circuit breaker opens, the linkage connected to the
pole shaft lever advances the counter reading by one (
Figure 5)
.
5.8 Ground contact
The ground contact is an assembly of spring loaded fingers providing
a disconnectable means for grounding the circuit breaker chassis,
after it has been inserted into a switchgear structure. The ground
contact is located on the left side of the circuit breaker under the
mechanism bottom pan. An extension of the switchgear ground bus
is secured to the cell floor in such a position to engage the ground
contact automatically, when the circuit breaker is moved into the
DISCONNECT or DISCONNECT / TEST position. It remains engaged
in all other circuit breaker positions within the cell
(Figures 12, 13,
and 15
).
5.9 MOC and TOC switch operations
The mechanism operated cell (MOC) switch operator is coupled to
the pole shaft (
Figure 15)
. In the TEST and CONNECTED positions
of the circuit breaker, the operator aligns directly above the MOC
switch bell crank levers in the cell. As the circuit breaker closes,
the operator moves down and pushes the bell crank lever to change
the MOC switch contact position. Thus, the MOC switch contacts
operate in the same manner as the auxiliary switch contacts in the
circuit breaker. Although the MOC switch operator is provided on all
circuit breakers, the cell mounted MOC switches are only provided
when specified with the switchgear order. The standard electri-
cal connector for the control wires is a plug on style connector.
Optional ring tongue lug connectors can be provided.
The truck operated cell (TOC) switch operator is mounted inside the
right corner of the circuit breaker cell (
Figure 15).
It operates the
TOC switch as the circuit breaker moves to the CONNECTED posi-
tion in the switchgear cell.
