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27
Installation
IB-60201
The MOC actuator is exposed when the circuit
breaker is outside the metal-clad switchgear
and can cause serious injury if the test
personnel or any object is in the travel path
during operation. Care should be taken to
isolate the MOC side of the circuit breaker for
these tests.
CAUTION
CAUTION
!
The circuitry is arranged to cause the
charging motor to operate again and
charge the main closing spring. Operating
the control switch on the front door of the
test cabinet to the “open” position will cause
the circuit breaker to open.
Alternatively, a test jumper cable may be
used to electrically operate the circuit
breaker using the control circuitry of the
circuit breaker compartment. Caution
must be exercised if this option is chosen
to ensure that operation of the control
circuitry of the compartment used for
test does not cause undesirable effects
or unintended operation of other
interconnected equipment such as
supervisory controls, SCADA, or automatic
transfer schemes.
First, remove the control fuses in the
compartment. Connect the jumper
cable to the secondary disconnect plug
in the compartment and to the circuit
breaker. Insert the fuses. The charging
motor will automatically charge the stored
energy mechanism’s main closing springs.
Operation of the breaker control switch
on the front door of the compartment
will cause the circuit breaker to close. The
circuitry is arranged to cause the charging
motor to operate again and charge the
main closing spring. Operating the breaker
control switch on the front door will cause
the circuit breaker to open.
6) Racking Mechanism Check
The standard design of racking mechanisms
may be checked outside the circuit breaker
compartment by inserting the secondary
disconnect override device (Figure 12) into
the secondary disconnect receptacle.
While pushing the manual trip operator
inward and moving the racking drive shaft
shutter downward, the racking drive shaft
can be accessed.
Note:
The racking drive shaft shutter cannot
be moved downward unless the
manual trip operator is pushed inward
to ensure an open circuit breaker and
the secondary disconnect override
device is inserted into the secondary
disconnect receptacle.
Insert the racking handle onto the racking
drive shaft. The racking crank arms at the
sides of the circuit breaker should be in the
fully withdrawn position and point towards
the primary disconnecting devices.