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14
U N I G E A R Z S 2 I N S TA L L AT I O N , O P E R AT I O N A N D M A I N TA I N A N C E I N S T R U C T I O N M A N U A L
4.2.3 Withdrawable parts
4.2.3.1 Withdrawable circuit breaker parts
The withdrawable assembly with the circuit
breaker and the switchgear are coupled via
a multi-pole control wiring plug connector.
The racking mechanism establishes mechanical
connections between the switchgear and circuit
breaker. The circuit breaker can be moved
between Test and Service positions by means of
the handle provided, with front door closed.
Service and Test positions are set precisely by
means of lead bolt arrangement to ensure that
the breaker reaches the final position. The Test
and Service position indication can be observed
on the low voltage compartment.
The moving part with the circuit breaker
is moved either manually or by a motor by
means of a spindle, between the service or test
positions with the front door
closed. Service and test positions
are set precisely by means of auxiliary switches,
which register the final position reached and
the angular position of the spindle.
The earthing connection between circuit breaker
and the switchgear is established throughout;
from Test position to Service position by means
of finger contact bolted with circuit breaker and a
travel rail connection arrangement which is
bolted on to the switchgear refer Fig.20.
Separate earthing provisions for circuit breaker
in Test and Service positions are available
on request.
—
Figure 21 - VD4 Circuit breaker operating element.
—
Figure 20 - Scribe Earthing
The control wiring plug and socket are also coded
to prevent any erroneous connection between
incompatible withdrawable part and the
switchgear, though their dimensions appear
similar.
Thanks to the coding fitted in the control wiring
plug and socket!
1.
Lever for manually charging the
closing spring.
2.
Coupling lever for racking
in /out operation
3.
Opening push button
4.
Closing push button
5.
Signaling device for circuit breaker
open/closed.
6.
Signaling device for closing spring
charged/ discharged.
7.
Operation counter.
8.
Handles for operating the truck locks
(only for withdrawable circuit breakers).
3
4
6
5
7
1
8
2
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