Interlocks - TAVRIDA ELECTRIC VCB15 Product Manual

6.1 Interlocks

The VCB provides all the interlocks required to provide high level of safety and reliability during installation,
commissioning and operation.
Standard safety interlocks included:
• The draw-out unit can only be moved in case the ISM is open and locked against closing.
• The ISM can only be unlocked and operated in case the draw-out unit is exactly in the test or service position.
• The interlocks can only be unlocked and operated if the draw-out unit is in the test or service position.
Figure 32
The DOU cannot be moved while the ISM is closed.
Interlocks related to the draw-out unit located inside the switchgear:
• The draw-out unit can only be moved when the earthing switch is open.
• The earthing switch can only be closed when the draw-out unit is in the test position.
• The draw-out unit can only be moved to the service position when the switchgear circuit breaker's compartment
door is closed.
• The draw-out unit can only be removed from the switchgear when the draw-out unit is in the test position.
44
Figure 33
The ISM cannot be closed while the DOU is in the intermediate
position.
Figure 34
The DOU cannot be removed from the switchgear when the DOU
is not in the test position.