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46
SAFERING XT/SAFEPLUS XT
—
20. Service and maintenance
20.1 General warnings and cautions
WARNING !
Pay attention to the following safety warnings:
Preparing the switchgear for safe assembly
1.
For each case, set safe working conditions with the
utility safety officer.
2.
Make sure that national safety regulations are
followed.
3.
Make sure there is no voltage in the busbars and
cable terminals and that the risk of reconnection is
eliminated in all units. Any remote control must also
be prevented.
4.
Make sure that auxiliary circuits are also
disconnected from all possible power supply sources
(including instrument transformers)
Tools required
•
Tool list as specified under chapter 20.6
•
Vacuum cleaner
•
Cleaning cloths
•
Mild alkaline cleaning agent. Do not use trichloroethane,
carbon carbotetrachloride or any kind of alcohol, etc. for
cleaning
•
Clean water
•
Silicone liquid
•
In special cases, insulating surfaces can be covered
with a thin layer of silicone liquid such as DC200/100CS
or similar
•
Instruction manuals
•
Test equipment
Maintenance instructions
Maintenance serves for preserving trouble-free operation
and achieving the longest possible working life of the
switchgear.
It comprises the following closely related activities:
Inspection: Determination of the actual conditions
Servicing: Measures to preserve the specified conditions
Repairs: Measures to restore the specified conditions
The time intervals for maintenance work to be carried
out always depend on the operating conditions of the
switchgear and, above all on the mode of operation,
the number of rated and short-circuit current switching
operations, ambient temperature, pollution, etc.
The maintenance intervals and measures to be taken that
are given in table below are recommended for
SafeRing XT/SafePlus XT under normal service conditions.
Three year intervals are recommended for all maintenance
measures in more demanding conditions (such as areas
with high pollution levels).
Other important instruction manuals
The operation of all protection relays should be checked in
accordance with the manufacturer's instructions.
All components in the SF
tank are maintenance-free for the
6
declared life expectancy of the product. The tank is made of
stainless steel.
20.2 Maintenance intervals
We recommend carrying out the maintenance work at the
following intervals:
According to section
Activity performed
20.3
Inspection
20.4
Service
20.5
Repairs
1)
Under more demanding service conditions, we recommend shortening this interval
appropriately.
2)
According to the results of the inspection.
Other services may be required, as when max number
of operations is reached, please contact ABB to order
inspection.
NOTE
Under abnormal operating conditions (including adverse
climatic conditions) and/or particular environmental
conditions (among which, heavy pollution and aggressive
atmosphere), inspection at shorter intervals may be
necessary.
1. Door should be closed properly once servicing and
maintenance job completed
2. Check the gasket during/after servicing and
maintenance job
Time interval in years
5
1)
As required
2)
As required
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