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6 Maintenance
Maintenance kits are supplied and charged for by Siemens Ltd. as part of the inspection and maintenance
service.
It is not advisable for the customer to hold stocks of maintenance kits, as some parts, e.g. O-ring seals, are
subject to aging.
6.1.4
Initial Date for Inspection and Maintenance Service
The starting date for the inspection and maintenance schedule is that at which the filter material is placed in the
circuit-breaker, which is then evacuated and filled with gas. This is normally the year of production.
The starting date is only related to the insertion of the filter material, not to the date of energization.
The starting date should be recorded in writing and the number of mechanical operations and fault current
operations etc. monitored in order to see whether inspection and maintenance should be carried out as a function
of time or of wear.
6.1.5 Disturbances
In the event of a disturbance, please request appropriate Siemens representation of qualified personnel. We ask
you to state the type and extent of the disturbance as accurately as possible. Please name any that are showing
signs of damage. To simplify identification, state the designations given in the operating instructions (designations
and part numbers together with the order number of the operating instructions 927 00966 174 A, page number,
number of the illustration) and state the serial number of the circuit-breaker concerned.
6.1.6
Points to be Noted
The locking elements of any screwed joints opened for inspection must be replaced.
The same applies to all seals and gaskets exposed in the process. All open circuit-breaker parts should be
covered to prevent the ingress of dirt.
During normal operation no switching dust should result from switching. If dust is found after repeated interruption
of high short-circuit currents, proceed as follows:
Any switching dust should be removed immediately when the circuit-breaker is opened and any subassemblies
have been removed. When this dust is exposed to air for some time it will absorb moisture and can then only be
removed with difficulty.
Gloves should be worn!
Remove the dust with a piece of cloth or use a vacuum cleaner. Do not stir it up unnecessarily. Cloths and
switching dust should be disposed of in keeping with environmental regulations.
