M ED I U M VO LTAG E P R O D U C T S
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4. Insertion and removal, putting into service
Preliminary operations
Clean the insulating parts with clean dry cloths.
Check that the top and bottom terminals are clean
and free of any deformation caused by shocks
received during transport or storage.
4.1. Insertion and removal of
withdrawable circuit breaker
This section describes the process for inserting the
circuit breaker into the Disconnect position of the
switchgear and the removal of the circuit breaker
from the Disconnect position. Racking of the circuit
breaker to and from the Test Disconnect position is
covered in the next section. The following rules
must always be observed when inserting or
removing the circuit breaker device from the
switchgear compartment.
DANGER
• Do not attempt to remove the circuit
breaker from the circuit- breaker
compartment without the required ramp,
dolly or lift truck. Refer to the specific
switchgear installation and maintenace
manual for details.
• Do not attempt to insert the circuit
breaker into any compartment prior to
inspection. Compare the circuit breaker
name plate rating with the switchgear
rating. Verify secondary voltages on the
circuit breaker and in the compartment.
• Do not attempt to insert a closed circuit
breaker.
• Always inspect the circuit breaker
compartment to insure that it is free of
obstructions, tools, or other equipment.
Insertion:
from Withdrawn position
1. Align the circuit breaker and ramp, dolly or lift
truck with the compartment (Fig. 4).
2. Pull the handles (1 - Fig. 5) to center (this
withdraws Cell Interlock Tabs (3 - Fig. 5) allowing
the circuit breaker to be inserted).
3. Push the circuit breaker into the compartment
with the handles. Interlocks may restrict
insertion. (Refer to Interlocks section)
4. Align the circuit breaker interlock tabs (3 - Fig. 5)
with the compartment slots (Fig. 4).
5. Push the handles out to fully engage the cell
interlock tabs into the compartment slots.
6. Visually check that cell interlock tabs are
engaged in the compartment slots (if cell
interlock tabs are not fully extended, racking is
prevented).
7. The circuit breaker is now in the Disconnect
position.
Removal: to Withdrawn
position
1. Visually verify that the truck (9 - Fig. 10a) is
against the truck locator channel (8 - Fig. 5).
2. Pull the handles to the center (1 - Fig. 5).
3. Pull the circuit breaker from the compartment
with the handles onto the required
transportation device.
4. The circuit breaker is now in the withdrawn
position.
4.1.1. Connection of the auxiliary circuits
Note: the minimum cross-section of the wires used
for the auxiliary circuits must not be less than the
one used for the internal cabling AWG16.
Furthermore, they must be insulated for 3 kV test.
Please note that auxiliary circuits must be energized
with 2 kV (maximum test voltage) as per standards
indications.
The auxiliary circuits of withdrawable circuit
breakers are fully cabled in the factory as far as the
connector.
For the external connections, refer to the electric
wiring diagram of the switchgear.
Connect the plug (1 - Fig. 2a) with the secondary
disconnectors (Fig. 6).
4.1.2. Capacitor discharge circuit
Procedure for discharging the capacitor/s
Remove the plug (1 - Fig. 2a).
Activate the circuit breaker.
Disconnect the power supply voltage.
Operate the circuit breaker by pressing the
pushbuttons with the following cycle: O-C-O.
The luminous “Ready” signal turns off when the
operation cycle has been completed, i.e. when the
circuit breaker is no longer ready for operations.
After 10 minutes have passed, the capacitor voltage
drops to a value of less than 15 V.
Summary of Contents for VM1/A/P
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