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28
PowlVac® CDR 27kV & 38kV Vacuum Circuit Breaker
IB-65020A
Installation
An alternate method for the electrical
operation check is to use a test jumper
cable to electrically operate the circuit
breaker using the control circuitry of
the circuit breaker compartment. If this
method is used, ensure that the operation
of the control circuitry of the compartment
being used for testing 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.
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CAUTION
CAUTION
!
Before installing any circuit breaker into a
compartment, the user MUST verify that the
circuit breaker rating meets the metal-clad
switchgear rating.
1) Prior to Inserting the Circuit Breaker into
the Circuit Breaker Compartment
2) Inserting the Circuit Breaker to the
Test/Disconnect Position
3) Inserting the Circuit Breaker to the
Connected Position
Refer to the metal-clad switchgear instruction
bulletin and drawings produced specifically
for the installed equipment for additional
information and cautions before attempting to
insert the circuit breakers into the metal-clad
switchgear equipment.
Each circuit breaker and metal-clad switchgear
is provided with interference plates which are
designed to ensure that no circuit breaker with
less than the required voltage, continuous
current, or interrupting current rating is placed
in the incorrect circuit breaker compartment.
If you attempt to insert an improperly
rated circuit breaker into the circuit breaker
compartment, these plates will interfere
with each other and deter further insertion.
The interference will occur before the circuit
breaker reaches the disconnected position.
Do not attempt to force the circuit breaker
past the compartment interference plate or
remove the interference plates from either the
compartment or the circuit breaker. Remove
the incorrect rated circuit breaker and insert a
properly rated circuit breaker into the
metal-clad switchgear.
