ABB VD4 Series Instruction Manual - page 28
28 VD4 Vacuum-circuit-breaker | Instruction manual 534/01
Note:
- In order to avoid damage to the operating mechanism, use
the original hand crank only:
- Standard version without slip clutch
- Optional version with slip clutch.
- Turn the crank clockwise according the table until the stop
is reached and the withdrawable part is in the service
position.
Note:
Do not force to move the withdrawable breaker part (max.
torque 25 Nm)!
Comply with the conditions for movement of the withdrawable
part as set out in section 8.5.6!
Number of
crank turns
Panel type
24 kV
UniGear ZS1, PowerCube,
mounting frame (Powerbloc)
30
- Observe the position indicator.
- Remove hand crank 5 by pressing first against the hand
crank and then remove.
Note:
When removing the crank, it is essential to ensure that the
spring-loaded scene head 4.1 slides into the untensioned
front position. Spindle 4 is thus locked in place, preventing in-
advertent turning of the spindle. Turning of the spindle opens
auxiliary switches -BT2/-BT1 and thus prevents the circuit-
breaker from being operated.
Note:
The withdrawable part must not be stopped at any position in
the travel range between the service position and test/discon-
nected position!
7.3.2 Manual withdrawal from the service position into the
test/disconnected position
- Ensure that the circuit-breaker is in the OFF position.
- Reverse the procedure described above for insertion into
the service position.
Note:
Withdrawable parts with blocking magnet -RL2 may not be
forcibly moved during power failures. In such a case they are
blocked in the service and test positions. For deblocking, see
section 8.5.6.
7.3.3 Motor-driven movement of the withdrawable part
- Briefly operate the electrical control for insertion or withdra-
wal (the withdrawable part then automatically moves into
the opposite position).
- Observe the position indicator.
Note:
When the motor fails, the withdrawable part can be moved in
emergency manual operation. If the drive motor fails during
movement of the withdrawable part, the withdrawable part
must be moved into a limit position in emergency manual
operation.
As a precondition for an auto-reclosing sequence, the opera-
ting mechanism is either (re-)charged after a clos ing opera-
tion automatically by the charging motor, or it requires (re-)
charging by hand if the operating mechanism is of the manual
type.
Emergency manual operation:
Emergency manual operation is carried out with the hand
crank 5 on the spindle mechanism 4, in a similar manner to
operation of a withdrawable breaker part with manual sys-
tems:
- Turn off the supply voltage (m.c.b.), since the motor would
otherwise be braked electrically.
- Turn hand crank 5 in the required direction.
When the withdrawable part moves, the motor turns. The
motor functions in such a case like a generator, i.e. it can
lead to reverse voltages in the terminals.
The motor protection device must not be changed from
the specified type and rated value, or the behaviour of the
permanent magnet motor could be irreversibly impaired
7.3.4 Withdrawal from the test/disconnected position onto
the service truck
- Open the door of the circuit-breaker com part ment.
- Release control wiring plug 8.1 and engage it in the sto-
rage position on the withdrawable part.
- Position service truck 48 with the guide pins 48.2 of the
adjustable bench top at the correct height facing the panel
front, and allow catch 48.3 to engage.
- Move sliding handles 3.1 inwards against the springs to
release withdrawable part 1, withdraw onto the service
truck and secure it in the catches on the truck.
- Press the release lever (at the front underneath the bench
top) and release the service truck from the panel.
7.3.5 Insertion from the service truck into the test/discon-
nected position
- Carry out the procedure as described above for withdra-
wable, changing the order accordingly.
7.4
Operation of the circuit-breaker
(Figures 4/4 and 7/1)
7.4.1 Charging the spring energy storage mechanism
Circuit-breakers with charging motors:
- Charging takes place automatically.
- If the charging motor breaks down, the charging process
can be carried out or completed manually.