ABB VD4G-25 Installation And Operating Instructions Manual page 10

V D 4 G I N S TA L L AT I O N A N D O P E R AT I N G I N S T R U C T I O N S
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5. Description
5.5. Withdrawable circuit-breakers
Withdrawable circuit-breakers up to 15 kV are
available for UniGear ZS1 switchgear.
They consist of a truck to which the bearing
structure of the actual circuit-breaker is fixed.
Circuit-breakers for UniGear ZS1 switchgear (fig.
5a)
The cord with plug (13) for connecting the electrical
accessories of the operating mechanism comes out
of the upper part of connector (14).
Strikers for operating the contacts (connected/
disconnected) in the switchgear are fixed to the
upper part of the circuit-breaker.
Slides (9) for operating the segregation shutters of
the medium voltage contacts in the enclosure or
switchgear are fixed at the sides of the circuit-
breaker. Circuit-breakers for UniSec switchgear have
wheels (17) for this purpose.
The front part of the circuit-breaker truck has a
cross-beam with handles (16) which latches onto the
circuit-breaker when this is racked-in/out by means
of the operating lever (15).
The circuit-breaker is complete with disconnection
contacts (8).
The withdrawable circuit-breaker has locks on the
front cross-beam allowing it to be latched into the
corresponding slot-in joints of the switchgear.
Key
1 Lever for manual
loading of closing
spring
2 Signaling device for
circuit-breaker open/
closed
3 Rating plate
4 Opening pushbutton
5 Closing pushbutton
6 Signaling device for
closing spring loaded/
discharged
7 Operation counter
8 Disconnecting
1
contacts
9 Chute for operating
2
shutters of UniGear,
PowerCube switchgear
3
10 Truck
11 Locks for latching to
fixed part
12 Strikers for operating
contacts in enclosure
13 Connector (plug)
14 Wiring connection
15 Operating lever for
circuit-breaker
racking-in/out
16 Lock operating handles
(11)
17 Wheels for moving
segregation shutters
Fig. 5a
16
The locks can only be operated by the handles when
the truck rests completely against the cross-beam.
The operating lever (15) must be inserted to its full
extent (see sect. 7.5.). A lock prevents the truck from
advancing into the enclosure or fixed part when the
earthing switch is closed.
Another lock prevents racking-in/out when the
circuit-breaker is closed. When the truck is in the
intermediate position, between disconnected and
connected, a further lock (both mechanical and
electrical) prevents the circuit-breaker from closing.
The truck is also fitted with a locking magnet which,
if de-energized, prevents the truck from being
racked-in.
An interlock is available on request to prevent the
circuit-breaker from being racked-in when the door
is open and the door from being opened when the
circuit-breaker is closed.
The lever for loading the closing spring (1) in the
manual mode is built into the operating mechanism.
The spring is loaded by repeatedly lowering the lever
by linear movements until the yellow indicator (6)
appears to show that loading is complete.
The spring can only be loaded with the switchgear
door open. Comply with the instructions in the
UniGear switchgear manual for the operations that
can be performed with the door open.
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