ABB | SACE Emax 2
Putting into service and maintenance | 5 - Second level maintenance
257 | © 2013 ABB | 1SDH001000R0002 - L7804
5 - Second level maintenance
The second level of maintenance must be performed in accordance with the maintenance
schedule shown on page 252.
Preliminary operations
The following are the operations to be carried out:
1. Open the circuit-breaker and make sure that the springs of the operating mechanism
are unloaded.
2. In the case of a withdrawable circuit-breaker work with it withdrawn from the fixed part.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
operations" on page 18 .
Figure 95 - Remove the moving part from the fixed part.
WARNING! 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 earth the terminals on both the supply side and load side.
Inspections and general
cleaning
Perform the following checks:
1. Check the cleanliness of the circuit-breaker, removing any dust or oily traces or excess
grease using a clean, dry rag (possibly using mild detergent. Use a cleaning product
such as Henkel 273471 or equivalent if there is a heavy coating of dirt).
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 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)
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