30
6.Periodical checks:
6.1. General
During normal service, the circuit-breakers are
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
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.
Before carrying out any operation, make sure that the operating
mechanism springs are discharged and that the apparatus is in
the open position.
!
!
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
Installation in normal
ambient
2 years 1 year
4 years 2 years
2 years 1 year
Five years or every Three years or every
10000 operations 5000 operations
Ten years or every 10000 Five years or every
operations 10000 operations
Installation in dusty
or polluted ambient
PART B Installation, Operation & Maintenance
