Maintenance - ABB ConVac Installation And Operation Instruction Manual

26 C O N V A C V A C U U M C O N T A C T O R I N S T A L L A T I O N A N D O P E R A T I O N I N S T R U C T I O N
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7. Maintenance

Maintenance operations are aimed at ensuring
trouble-free operation of the apparatus for the
longest possible time.
In general, the three following operations must be
carried out for maintenance:
Inspection: Assessment of the actual conditions
Servicing: Measures to be taken to maintain the
specified conditions
Repairs: Measures to be taken to restore the
specified conditions
7.1 General
Due to the simplified structure and the high
reliability of ConVac product, it has a long service
life. During the entire service life, ConVac need very
less maintenance, especially the critical part - Vacuum
interrupter – is maintenance free.
The maintenance is related to the wearing and aging
condition of the components, the time interval and
the scope of maintenance will depend on various
of factors such as working environment, operation
frequency, service time, etc.
Maintenance must only be carried out by ABB
personnel or by suitably qualified personnel with
appropriate training, and must follow other related
standards or regulations, such as assembling
process regulations.
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Table 7a
Inspected items Interval
1 Insulating parts 1 year
2 Nuts and bolts 1 year or 50,000 operations
3 lubrication of the 1 year or 50,000 operations
moving parts
4 Auxiliary contacts 1 year or 50,000 operations
5 Tulips and fuse holder 1 year or 50,000 operations
6 Mechanical interlock 1 year or 50,000 operations
7 Emergency opening
1 year or 50,000 operations
device
8 Vaccum interrupter 1 year or 50,000 operations
Operation to be carried out
Visual inspection of the insulating parts. The insulating parts must be free of any accumulation
of dust, humidity, dirt (clean if dirty), cracks, traces of surface discharges or damage.
Check whether the nuts and bolts are tightened and in the correct position (pay special
attention to the moving parts and force-bearing parts)，The tightening torque of the nuts and
bolts has been marked with color.
Visual inspection，NB52 lubricating grease from KLUBER company is recommended.
Check correct operation and the signals. Check that there are no burnt or worn contacts (if so,
please replace)
Visual inspection of the main contacts. The contact areas must be cleaned if the surface is
discolored, please clean and guarantee the lubrication of the surface. Recommend to turn the
tulip regularly.
When the contactor is at open/close position, and during closing and opening operations, check
the correctness of mechanical interlocks.
While contactor is at Close position, use emergency opening device to trip the contactor for
several times.
Please refer to chapter 7.2.2
Highly recommend to ask ABB service engineers
to take charge of the maintenance and repairment
tasks.
Before performing any maintenance operations,
make sure the contactor is at open position, and
all the power sources disconnected (including
main circuit and auxiliary circuit) with no risk of
power re-supply during the maintenance.
7.2 Inspection
7.2.1 General requirements before inspection
The recommended inspection period at normal
condition is 1 year or 50,000 operations, whichever
comes earlier.
When there are unusual service conditions (including
adverse climatic conditions) and/or in the case of
environmental pollution (e.g. heavy contamination
or an atmosphere with aggressive agents), the
frequency of inspections must be increased.
Visual inspection of the equipment surface for
contamination, dampness, corrosion and discharge.
Detailed items please refer to table 7a
In case of any abnormal conditions, it is necessary
to be considered for maintenance or repair.