Servicing - ABB Uniswitch Operation And Maintenance Manual

Repair measures

5.4 Servicing

Instructions
ABB
Uniswitc h Operation and
Maintenanc e Manual
If any irregular conditions are detected, then appropriate repair
measures must be taken (see 5.5).
If, during the course of an inspection in accordance with section 5.3, the
need for servicing measures has been established, then take the
following measures as required:
1: Tighten all electrical connections (main busbars, switches,
measuring devices, cables, etc.) to the correct torque as detailed in
the installation instructions.
2: Clean all parts (switches, circuit-breakers, tripping mechanisms and
motors etc.) with the vacuum cleaner and visually check them.
Clean the surfaces in general:
•
Weakly adhering dry dust deposits: clean with a soft dry cloth.
•
Wipe down after cleaning, using clean water, and dry properly.
3: Perform one close/open operation on all switches and circuit-
breakers including the earthing switches.
4: Connect the auxiliary control voltage but ensure that no remote
signals can activate the components. Perform one electrical
operation sequence on all motor operated devices and tripping
mechanisms.
5: Clean the busbar compartment and cable compartment. Remove
the switchgear cubicle roof and clean the SFG switch-disconnector
insulation materials and busbars with a soft dry clean cloth. Remove
all ingrained dirt such as sticky or greasy stains with a cloth and a
little alkaline cleaning agent. Wipe with a damp cloth using clean
water and carefully dry the surface. Do the cleaning in the same
way also in the cable compartment (bottom of SFG switch-
disconnector, instrument transformers, busbars and circuit-breaker).
Should partial discharges occur as a result of condensation, application
of a thin silicone film on the surface concerned is often effective as a
temporary remedy. It is advisable to ask the ABB after-sales service
department for advice regarding permanent solutions to this unusual
type of problem.
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UNI S14GB 05-02