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52
U N I G E A R Z S 2 I N S TA L L AT I O N , O P E R AT I O N A N D M A I N TA I N A N C E I N S T R U C T I O N M A N U A L
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9. Maintenance
9.1 Maintenance strategies
Preventive maintenance is 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.
Risk-based maintenance is maintenance carried
out by integrating analysis, measurement and
periodic test activities with 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.
WARNING - Always follow 7 safety steps:
9.2 Preventive maintenance
Maintenance serves to preserve trouble-free
operation and achieve the longest possible
working life of the switchgear. It comprises of
following closely related activities:
Inspection: Determination of the actual condition
Servicing: Measures to preserve the specified
condition
Repair: Measures to restore the specified
condition
Note:
When carrying out all maintenance work, the
regulations in the country of installation must be
strictly complied with. Maintenance work may be
• 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 to work
performed in a careful manner only by trained
personnel familiar with the characteristics of the
individual switchgear, in accordance with all
relevant IEC safety regulations and those of other
technical authorities, and with other overriding
instructions. It is recommended that ABB service
personnel be called in to 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 operations. On the other
hand, for other parts, the length of the intervals
may depend, for example, on the different modes
of operation in individual cases, the degree of
loading, and also environmental influences
(including pollution and aggressive air).
Operating instructions of circuit breaker must
also be followed together with this installation,
operation and maintenance manual.
If necessary, further details can be taken from the
technical documentation for the switchgear
Installation (including, for example, any special
operating conditions agreed upon).
9.2.1 Intervals for inspection, servicing and
repairs:
Time intervals for maintenance work to be carried
out always depend on the operating conditions of
switchgear and mainly on the mode of operation,
the number of rated and short- circuit current
switching operations, ambient temperature,
pollution etc. We recommend carrying out the
maintenance work at the following intervals
Time
Activity
According
interval
performed
to section
in years
Inspection 9.3
1
1)
Servicing
9.4
2
2)
As
Repair
9.5
required
1) Under more demanding service conditions, we
recommend shortening this interval as
appropriate - also refer sect. 8.1 and 8.2
2) According to results of inspection.
3) Refer installation, operation and maintenance
manual of circuit breaker
According to
number of
switching
operations
As required
3)
As required
3)
As required
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