Page xxx
IB131021EN
Effective Mar 2018
Figure 5-5 Typical VCP-WL Control Scheme
–
Diagram shows breaker in open & discharged position with secondary power
removed
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 instruction manual supplied with the
switchgear assembly.
5-6
LEVERING MECHANISM
The purpose of the levering device is to move the circuit
breaker between the TEST and CONNECTED positions.
For Type VCP-WL circuit breakers, the device is a drive
screw and drive nut. Although the device is mounted in the
switchgear compartment, a brief description here will help
understand the operation (Figures
4-2
and
4-4
)
.
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 drive screw, a drive nut,
two side rails and a sliding cage. In the TEST position, the
nut is all the way to the front. As the circuit breaker is
pushed in, the levering latch snaps on the nut. Turning the
crank clockwise while pushing forward advances the circuit
breaker toward the CONNECTED position. During this
travel, the floor tripper TRIP roller is lifted up holding the
circuit breaker trip free. When the circuit breaker reaches
the CONNECTED position, the crank cannot be turned 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 crank. After tripping the circuit
breaker, the levering crank can be engaged and the circuit
breaker withdrawn to the TEST position by turning the
levering crank counterclockwise. This position is indicated
by no further motion of the crank.
