General instructions
Recommended sequence of operations
IG-136-EN version 10; 23/06/2016
52
cgm.3 system
Fully SF6 gas insulated medium voltage switchgear up to 40.5 kV in accordance with IEC Standards
5.8.3 Opening operation from earthing position
1. Move the driving shaft access handle to its lower
position.
2. Insert the lever in the earthing switch driving shaft,
move the drive arm to the end and press inwards
on the head of the lever with one hand, and turn 90º
anticlockwise with the other hand.
Figure 5.41 Lever turn process
3. Verify that the cubicle is in disconnected position.
Figure 5.42 Earthing switch open
5.8.4 Spring charge operation and closing of the switch - disconnector from disconnected position
1. Move the driving shaft access handle to its lower
position.
2. Insert the lever in the switch-disconnector driving
shaft, move the drive arm to the end and press
inwards on the head of the lever with one hand, and
turn clockwise with the other hand. In the same turn,
the switch-disconnector is closed and the retaining
springs are charged.
In the case of BR-AM motorised operation
mechanism, closing and tensioning of springs
can be carried out manually or motorised.
Figure 5.43 Lever turn process
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