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10
Reconditioning
DANGER
DANGER
REV7
/REV7
Danger due to electric shock.
Therefore:
- Disconnect the breaker from the high voltage system, and
ground (earth) the breaker at both ends.
Danger due to suddenly moving linkages.
Therefore:
- Discharge the closing and opening springs by carrying
out closing and opening operations.
Isolate and ground (earth) the breaker:
• Discharge the closing and opening springs.
This state is reached when the position indicator shows OPEN
and the spring position indicator is on "discharged." The
operations shown in the table below are required to reach this
state, depending on the starting situation.
• Disconnect the supply voltage to the motor.
Breaker Position
CLOSED / I
CLOSED / I
OPEN / 0
OPEN / 0
The equipment should preferably be reconditioned in closed, dry,
dust-free rooms. If this is not possible and the equipment has to be
reconditioned outdoors, then it should only be done in dry weather
when there is no wind.
The circuit breaker is equipped with a disconnect (isolating point)
between the interrupter chamber and the post insulator. All inter-
rupter chambers are interchangeable. This design makes it possib-
le to replace entire interrupter chambers quickly and then
recondition the interrupter chambers in closed rooms.
All functional elements must be inspected and cleaned with a
cleaning cloth soaked in alcohol.
If sealing bonds or gasketed joints are opened during these operati-
ons, then the respective elastomer gaskets or seals must be re-
placed.
OI 250 (EN)
State of the
Operations
Closing Spring
Executed
Charged
O-C-O
Discharged
O
Charged
C-O
Discharged
No operation required
R
ECONDITIONING
to
Be
81 / 146
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