Periodical Checking; Maintenance Operations - ABB hd4 Installation And Service Instructions Manual

9.

Periodical checking

Before carrying out any operation, make sure that
the operating mechanism springs are discharged
and that the apparatus is in the open position.
9.1. 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.
The following paragraph gives the checking programme table,
showing the relevant time 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, set the
optimal time limits for carrying out the following operations.
9.2. Checking programme
Checking operation
1 Carry out five mechanical opening closing
operations.
2 Visual inspection of the poles (parts in
resin).
3 Visual inspection of the operating
mechanism and transmission.
4 Visual inspection of the isolating contacts. 5 year or 5,000 operations.
5 Measuring the insulation resistance.
6 Checking interlock operation.
After 10,000 operations or after 10 years, for installation in
polluted and aggressive ambients, it is advisable to contact an
ABB service center to have the circuit-breaker checked.
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10. Maintenance operations

Time interval
1 year.
1 year or 5,000 operations.
1 year or 5,000 operations.
5 year or 5,000 operations.
5 year.
Maintenance must only be carried out by ABB
personnel or in any case by suitably qualified
customer personnel who have in-depth knowledge
of the apparatus (IEC 62271-1 para 10.4.2). Should
the maintenance by carried out by the customer's
personnel, responsibility for any interventions lies
with the customer.
Replacement of any parts not included in the "List
of spare parts/accessories" must only be carried
out by ABB personnel.
In particular:
– Complete pole with bushings/connections
– Operating mechanism
– Closing spring unit
– Opening spring.
Critera
The circuit-breaker must operate normally without stopping
in intermediate positions
The parts in resin must be free of any accumulation of dust,
dirt, cracks, discharges or traces of surface discharges.
The elements must be free of any deformation.
Screws, nuts, bolts, etc. must be tight.
The isolating contacts must be free of any deformation or
erosion.
Lubricate the contact elements with industrial vaseline
greaseindustriale.
See para. 8.1. point 2.
The interlocks provided must operate correctly.