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48
U n i G e a r Z S 1 I N S T A L L A T I O N , O P E R A T I O N A N D M A I N T E N A N C E
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8 Maintenance
8.1 Maintenance strategies
Preventive maintenance
is maintenance carried out at predetermined
intervals or according to prescribed criteria, aimed
at reducing the failure risk or performance
degradation of the equipment. This method is
based on scheduled activities performed on the
out-of-service equipment including: visual checks,
apparatus cleaning, mechanical components
lubrication, worn parts replacement and routine
tests execution.
Risk-based maintenance
is maintenance carried out by integrating analysis,
measurement and periodic test activities to
standard preventive maintenance.
The gathered information is viewed in the context
of the environmental, operation and process
condition of the equipment in the system. The
aim is to perform the asset condition and risk
assessment and define the appropriate
maintenance tasks.
Please refer to next chapters for details of
preventive and risk-based maintenance programs.
Safery warning
Always follow 7 safety steps:
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•
•
•
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•
8.2 Preventive maintenance
Maintenance serves to preserve trouble-free
operation and achieve the longest possible working
life of the switchgear. It comprises the following
activities.
Inspection: Determining the actual condition.
Servicing: Measures to preserve a specified condition.
Repair: Measures to restore the specified condition.
Clearly identify the work location
Disconnect and secure against
reconnection
Protect against any other live parts
Take special precautions when close to
bare conductors
Check the installation is dead
Carry out earthing and short circuiting
Issue a permit work
Note:
When carrying out all maintenance work, the
regulations in the country of installation must
be strictly adhered to. Maintenance work should
only be undertaken by trained personnel familiar
with the characteristics of the individual
switchgear. All work should be carried out in
accordance with all relevant IEC safety regulations
and with those of other technical authorities and
with other overriding instructions. It is
recommended that ABB service personnel perform
the servicing and repair work detailed below.
The inspection and servicing intervals for some
of the equipment/components (e.g. parts subjects
to wear) are determined by fixed criteria, such as
switching frequency, length of service and number
of short-circuit breaking operations. For other
parts of the switchgear, the length of the intervals
may depend, for example, on the different modes
of operation in individual cases, the degree of
loading and environmental influences (including
pollution and aggressive air).
The operating instructions for the Vmax circuit
breaker must also be followed, and if necessary,
further details (such as special operating conditions
agreed on with the manufacturer) described in
the technical documentation specific to the
switchgear installation should also be taken into
consideration.
Intervals for inspection, servicing and repairs
The time intervals for any maintenance work
depend on the operating conditions of the
switchgear, and in particular on the mode of
operation, the number of rated and short-circuit
current switching operations, ambient temperature,
pollution etc. We recommend carrying out
maintenance work at the following intervals:
Activity
According
Time interval
performed
to section
in years
Inspection
8.3
3
1)
Servicing
8.4
3
2)
Repair
8.5
As required
1) In more demanding service conditions, we recommend reducing this
interval suitably – also see sections 1 and 2.
2) According to the results of the inspection.
3) See the instruction manuals of the circuit-breakers.
*) Earthing switch.
According to
number
of switching
operations
2500
2500
3)
As required
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