122
Figure 192:
1 Busbars
2 Branch conductor
—
9. Maintenance
9.4 Servicing
When, during an inspection as per "9.3
Inspection", the need to carry out cleaning
operations is noted, proceed as follows:
• Clean the surfaces: Remove any dry dust
deposits which are not strongly adherent
using a soft dry cloth. Remove any more
adhering dirt with ETHANOL F 25 M.
• Clean the insulating surfaces and the
conductive components with ETHANOL F 25
M.
• After cleaning, rinse with clean water and dry
carefully.
• Should any partial discharges occur as a
consequence of the condensation
phenomenon, a temporary remedy which is
often effective is application of a thin layer of
silicone over the surface involved. For a
permanent remedy to this type of unusual
problem, contact the ABB service
department.
Maintenance in busbar compartment
Checking of the tightening main busbars
• By accessing through the circuit-breaker
compartment, remove the bulkhead 3 (Figure
192) unscrewing 7 x M8 screws.
• After the removal of the bulkhead from the
circuit-breaker compartment, the main
busbars are visible.
• Using a dynamometric spanner, check
tightness of all the screws. Refer to the "6.3
Assembly of the switchgear panels" for the
tightening values.
Maintenance in cable compartment
Checking tightening of the cable busbar
connections
• Open the cable compartment door; the cable
busbar connections are visible.
• Using a dynamometric spanner, check
tightness of all the screws. Refer to the "6.3
Assembly of the switchgear panels" for the
tightening values.
Note:
The cable compartment door cannot be opened if
the earthing switch is open.
Figure 193:
1 Earthing switch position indicator
2 Cable busbar connection
3 Fairlead
4 Slotted bottom plate
View of the busbar
compartment, UniGear ZS1 Digital
Internal view of the cable
connection compartment, with a maximum
number of six cables in parallel
Maintenance of Monitoring and Diagnostics
equipment
• Remove any deposits of dust using a dry
cloth that does not leave any deposits on the
treated surface (do not use woollen cloths)
• Manually check the TR sensors fixation (use
very low force)
3 Bulkhead, removable
4 Tulip isolating contact
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