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4.2.2 Circuit breaker compartment
The circuit breaker compartment contains all the
necessary arrangements for the rack-in and rack-
out operation of the withdraw-able part inside
the switchgear. Like the busbar compartment,
it is metallic partitioned on all sides.
The socket for the control wiring is firmly
mounted inside the circuit breaker compartment.
The tulip isolating contacts together with the
fixed isolating contacts are located on H-frame
and fixed through spout bushing. The shutters
are opened by means of lever assembly (Fig.16)
when inserting circuit breaker into the service
position and are closed when the circuit breaker
is removed. In the test/disconnected position of
the withdrawable part, partitioning by separation
4
3
—
Figure 16 - View into the circuit-breaker compartment.
1 Control wiring socket
2 Top shutter
3 Lower shutter
4 Left-hand travel rail
—
Figure 17 - Circuit breaker compartment with withdrawable
part in Service position
2
1
—
Figure 19 - Circuit breaker compartment with withdrawable part in
Test position
from service to test position is thereby
established in the main current circuit. Auxiliary
plug and socket with control wiring are to be
connected, when circuit breaker in the test/
disconnected position.
In the test position, the breaker would be
completely inside the switchgear with door
closed. The ON / OFF indication and CHARGED /
DISCHARGED condition of the closing spring of
circuit breaker can be observed through the
inspection window.
The switching operations are carried out with the
door closed. Emergency trip of the circuit breaker
is possible when circuit breaker is in the service
condition. (Emergency Trip arrangement).
—
Figure 18 - Shutter Assembly and Lever mechanism
13
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