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PART B Installation, Operation & Maintenance
6.Periodical checks:
Before carrying out any operation, make sure that the operating
!
!
mechanism springs are discharged and that the apparatus is in
the open position.
6.1. General
During
normal
service,
maintenance-free. The frequency and sort of inspections
basically depend on the service conditions. Various
factors must be taken into account: frequency of
operations, interrupted current values, relative power
factor and the installation ambient.
As a precaution, the following table gives the checking
program , showing the relevant time
6.2 Checking Program
Maintenance
operation
Carry out the
general
inspection
(For details, refer
clause 7.4)
Measure the
insulation
resistance
Lubricate the
sliding points
Carrying out the
operating
mechanism
maintenance
Complete
overhaul
the circuit-breakers are
Installation in normal
ambient
2 years
4 years
2 years
Five years or every
10000 operations
Ten years or every 10000
operations
intervals. As far as the time interval between
these operations is concerned, it is advisable
to comply with specifications given in the
table, at least during the first check. On the
basis of the results obtained during the
periodic inspections, contact an ABB service
center for any clarifications.
Installation in dusty
or polluted ambient
1 year
2 years
1 year
Three years or every
5000 operations
Five years or every
10000 operations
30
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