GE SF6 - Safety Measures

Maintenance
Intervention on the FK3- 4 operating device
GE Information L51- 303EN/05
3/10
11- 2016
Safety measures
Circuit- breaker
general preparing
The table below gives the steps to prepare the circuit- breaker to work safely :
Step Action Comment
1 Isolate the circuit- breaker from
the network.
Shut down the circuit- breaker,
de- energize and earth it.
2 Switch- off the supply circuit of
the reloading motor .
3 Check the SF
6
pressure gas. Make sure that the SF
6
pressure
gas is  p
me
.
Below this level, no mechanical
operating is allowed.
Release the springs
The table below gives the procedure to release the closing spring and the
opening spring depending the circuit- breaker state :
If the circuit- breaker
position is ...
Action
Closed
In the operating device, activate the
opening handle and the closing han-
dle like below :
1 - Open
2 - Close
3 - Open
Open
Activate the closing handle and the
opening handle like below :
1 - Close
2 - Open
Check the optical
signalization
Check that the operating mechanism’s optical signalization shows the sym-
bols below :
Circuit- breaker
Open
Closing spring
Released