ABB | SACE Emax 2
64 | © 2019 ABB | 1SDH001000R0002 - ECN000109166 - Rev. D
Putting into service and maintenance | 5 - Second level maintenance
5 - Second level maintenance
The second level maintenance must be performed in accordance with the maintenance schedule shown on
page 58.
Preliminary operations
WARNING! before proceeding with any maintenance operation, it is mandatory to:
•
Set the circuit-breaker to the open position and make sure that the springs of the
operating mechanism are discharged.
•
In the case of a withdrawable circuit-breaker work with it withdrawn from the fixed
part.
For removal of the fixed part see paragraph "
Circuit breaker racking-in/racking-out
on page
Figure 82 - Remove the moving part from the fixed part.
•
If work must be performed on fixed circuit-breakers or on fixed parts, disconnect
the power supply to the power circuit and auxiliary circuits and visibly ground the
terminals on both the supply side and load side.
Inspections and general
cleaning
Perform the following checks:
1. Make sure that the circuit-breaker is clean. Remove dust and oily substances or excess grease with a
clean, dry cloth (use a mild detergent if necessary. If there is a thick build-up of dirt, use a thinner from
the greasing kit or ask for assistance from the service staff).
2. Check that the rating plates with the technical specifications of the apparatus are present.
3. Clean the rating plates with clean, dry rags.
4. If the circuit-breaker is in the withdrawable version, remove all traces of dust, mould, condensation
and oxidation inside the fixed part.
5. Make sure that there are no traces of overheating or cracks, which could impair the insulating parts
of the circuit-breaker
6. Check the integrity of the separation pliers (for withdrawable circuit-breaker).
7. The jaw contacts must be silvery in colour with no traces of erosion or discoloration.
8. Make sure that there are no foreign bodies in the circuit-breaker compartment.
9. Make sure that the screws that fasten the fixed part to the switchgear are well tightened (M8 - 25Nm
- 221.27 lb in)
