General instructions
Recommended sequence of operations
IG-136-EN version 10; 23/06/2016
40
cgm.3 system
Fully SF6 gas insulated medium voltage switchgear up to 40.5 kV in accordance with IEC Standards
5.4.6 Earthing operation from the disconnected position
1. Move the driving shaft access handle in the yellow
zone to its lower position.
2. Insert the lever in the earthing switch driving shaft,
move the driving arm to the end and turn clockwise
90º.
Figure 5.15 Lever turn process
3. Verify that the cubicle is in earthing position.
Figure 5.16 Earthing switch closed
5.4.7 Cable test
These driving mechanisms allow the operation
of going from earthing switch closed to switch-
disconnector open, even when the cable
compartment cover is open. Thus, the switch-
disconnector cannot be changed to the closed
position until this cover has been put back.
The cable test can only be carried out in cgm.3
feeder functions which include driving mechanisms
B/BM with this characteristic. Please check with
Ormazabal.
1. Follow the steps in section “5.4.6 Earthing operation
from the disconnected position”
2. Leave the lever in the earthing switch access (yellow
area)
3. Open the lower cover to access the cable compartment
4. With the lever in the earthing switch access, follow
the steps in section “5.4.3 Opening operation from
earthing position”
5. Carry out the cable test
6. To return to earth position, follow the steps in section
“5.4.6 Earthing operation from the disconnected
position”
7. Close the lower cover to access the cable compartment
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