Alstom GL314 - Safety Measures

Maintenance
Intervention on the operating device
L51--302EN/01
3/10
10--1999
E ALSTOM
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