Insertion And Removal, Putting Into Service; Insertion And Removal Od Withdrawable Circuit-Breaker - ABB VM1 Installation And Service Instructions Manual

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.
• 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.
dangeR
insertion: from Withdrawn position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Removal: to Withdrawn Position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.
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