Maintenance
Maintenance plan
L51--003EN/03
2/6
06--2004
E ALSTOM
Maintenance plan
Maintenance
frequency
Under normal operating conditions, the maintenance plan 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 working properly.
Inspections Every five years
This necessitates
circuit--breaker shutdown. It
is not necessary, however to
dismantle interrupting
chambers and other
sub--assemblies.
Overhaul
Perform when one of the
following criteria is reached :
D operating life time
³ 20 years
D number of mechanical
cycles ³ 3,000
D electric wear limit
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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