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Installation
01.4IB.77020
5) Electrical Operation Check
To check the basic electrical operation
of the circuit breaker, a circuit breaker
test cabinet must be used. Connect
the secondary disconnect from the
test cabinet to the circuit breaker to be
tested. The test cabinet provides control
voltage via a secondary disconnect plug
to the circuit breaker and the appropriate
control switches to verify the close and
open functions of the circuit breaker.
Specialized versions of the test cabinet
may also contain circuits for circuit
breakers equipped with dual shunt trip
coils, undervoltage devices, or other
options. With the secondary disconnect
plug installed in the circuit breaker under
test, operate the power switch on the
test cabinet. The charging motor will
automatically charge the stored energy
mechanism’s main closing springs.
Operation of the control switch on the
front door of the test cabinet to the “close”
position 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 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) Emergency Racking Mechanism Check
(PowlVac-NDA
™
Series 4 Circuit Breaker Only)
The emergency racking mechanism may
be checked outside the circuit breaker
compartment.
The emergency racking drive shaft can be
accessed by moving the emergency racking
drive shaft shutter
downward.
Note:
The emergency racking drive shaft
shutter cannot be moved downward
unless the circuit breaker is open.
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.
