Maintenance
Intervention on the operating mechanism
P51--3001EN/03
3/10
09--2011
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GRID
Safety measures
General preparation
of the circuit--breaker
The table below shows the steps to take to be able to work in complete safety
on the circuit--breaker:
Step Action Remark
1 Isolate the circuit--breaker from
the network.
Put the circuit--breaker out of
operation, power it down and
ground it.
2 Interrupt the resetting motor
power supply.
3 Check the SF
6
gas pressure. The SF
6
gas pressure must be
≥ p
me
.
Below this level, no mechanical
operations are authorized.
Release the springs
The following table gives the procedure for disarming the closing spring and
opening spring according to the circuit--breaker position:
If the circuit--breaker
position is ...
Action
Closed
In the operating mechanism, actuate
the opening handle and closing
handle as follows :
1 -- Open
2 -- Close
3 -- Open
Open
Actuate the closing handle and
opening handle as follows :
1 -- Close
2 -- Open
Checking the
visual signaling
Check that the operating mechanism’s visual signaling displays the symbols
below:
Circuit--breaker
Open
Closing spring
Unarmed
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