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U n i G e a r Z S 1 I N S T A L L A T I O N , O P E R A T I O N A N D M A I N T E N A N C E
12
3.4 Interlock/protection against incorrect
operation
All interlocking features are realized mechanically
or through an electrical interconnection.
3.4.1 Panel internal interlocking
To prevent hazardous situations and incorrect
operation, there is a series of interlocks to protect
both personnel and equipment.
•
The withdrawable part can only be moved from
the test/disconnected position (and back)
when the circuit- breaker and earthing switch
are off. In the intermediate position, the switch
is mechanically interlocked. The interlock is
electrical if the circuit breaker features an
electrical release
•
The circuit breaker can only be switched on
when the withdrawable part is in the test or
service position. In the intermediate position,
the switch is mechanically interlocked. The
interlock is electrical if the circuit-breaker
features an electrical release
•
In the service or test positions, the circuit
breaker can only be switched off manually
when no control voltage is applied and it cannot
be closed (electromechanical interlock)
•
Connecting and disconnecting the control wiring
plug is only possible when the withdrawable
part is in the test/disconnected position
•
The earthing switch can only be switched on
if the withdrawable part is in the test/
disconnected position or outside of the panel
•
If the earthing switch is on, the withdrawable
part cannot be moved from the test/disconnected
position to the service position
•
Details of possible interlocks, for example in
connection with a locking magnet on the
withdrawable part and/or an earthing switch
drive, can be obtained from the relevant order
document
3.4.2 Interlocking doors
•
The withdrawable parts cannot be racked in
if the apparatus compartment door is open
(Fig. 8, 9)
•
The apparatus compartment door cannot be
opened if the apparatus is in service or in an
undefined position (Fig. 10, 11)
•
The earthing switch cannot be operated if the
cable compartment door is open (Fig. 12, 13)
•
The cable compartment door cannot be opened
if the earthing switch is open (Fig. 14, 15)
3.4.3 Interlocks between panels
•
The busbar earthing switch can only be closed
when all the withdrawable parts in the relative
busbar section are in the test/disconnected
position (electrical interlock)
•
When the busbar earthing switch is closed, the
withdrawable parts in the earthed busbar section
cannot be moved from the test/disconnected
position to the service position
(electromechanical interlock)
3.4.4 Locking devices
•
The shutters can be secured independently of
each other with a mechanical lock when the
withdrawable circuit-breaker part has been
removed
•
Access to the operating shaft of the earthing
switch can be restricted using a padlock (or
keylock)
•
Access to the circuit-breaker racking slot, the
circuit-breaker compartment and the cable
compartment can be restricted using a padlock
(or keylock)
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