Maintenance
Maintenance plan
G51--001EN07
2/18
02--2011
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relied on that it is complete or correct or will apply to any particular project. This will depend on the technical and commercial circumstances. It is
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strictly prohibited.
GRID
Maintenance plan of circuit --breaker
(20000 guaranteed mechanical cycles)
Maintenance
frequency
Under normal operating conditions, the maintenance plan of circuit--breaker
may be defined as follows :
Type of
examination
Frequency
Comment
Maintenance
visits
Once or twice a year
It is advisable to perform at
least 2 CO duty cycles per
year, when apparatus are
scarcely used, in order to
check that the circuit---
breaker and associated
control circuits are work-
ing properly.
Inspections
Every five years
This necessitates circuit---
breaker shutdown. It is not
necessary, however to dis-
mantle interrupting chambers
and other sub--assemblies.
Overhaul
Perform when one of the fol-
lowing criteria is reached :
D
operating time
≥
20 years
D
electric wear
D
Service life for the motor---
driven fans (if applicable)
≥
25,000 hours/fan
However, it is recommended
to proceed with inspection of
the pole or circuit--breaker
used the most, then to adapt
the maintenance programme
for
the
other
breakers
depending on the results
observed.
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