Circuit-Breaker - Type Vd4; Charging The Stored Energy Spring System; Opening And Closing The Vd4 Type Circuit-Breaker - ABB Uniswitch Operation And Maintenance Manual

4.4.3 Circuit-breaker - type VD4

4.4.3.1 Charging the stored energy spring system

Instructions
Figure 4.17
Manual operation of
part with VD4
withdrawable
circuit-breaker

4.4.3.2 Opening and closing the VD4 type circuit-breaker

Instructions
Figure 4.18
Further information
ABB
Uniswitc h Operation and
Maintenanc e Manual
On the circuit-breaker with charging motors, charging is carried out
automatically. If the charging motor should fail, the charging procedure
can be carried out manually.
On breakers with manual charging systems, open the door with the
withdrawable part in the disconnected position, insert charging lever
(80.4) into the recess and pump for approximately 25 strokes until the
charged condition is indicated (43.4). When the charged condition is
reached, the charging mechanism is automatically disengaged, and any
further strokes of the lever have no effect.
•
Opening and closing operations with the withdrawable part in the
service position should only be performed with the door closed.
•
Operate the local or remote electrical control.
•
Observe the switch position indicator.
The switching operation counter (43.3) (Figure 4.17) for the circuit-
breaker automatically increases by one unit with each operating cycle.
An additional control mechanism fitted in the door of the circuit-breaker
compartment enables mechanical operation of the circuit-breaker with
the door closed and with the withdrawable part in either position.
•
Press the relative mechanical pushbutton (60.6 or 60.7), having
previously turned knob (60.12) anti-clockwise to the stop if the
withdrawable part is in the service position.
•
Observe the switch position indicator.
For further details regarding operations and maintenance of VD4 circuit-
breakers, see instruction manuals BA 352 and BA 359.
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UNI S14GB 05-02