Maintenance And Service; Maintenance; Visual Inspection; Preventive Maintenance - Siemens 8BT2 Installation And Operating Instructions Manual

7.

MAINTENANCE AND SERVICE

7.1.

Maintenance

Time schedule for
maintenance
measures
Measure

Visual inspection

Preventive
maintenance
7.1.1. Visual inspection
7.1.2.

Preventive maintenance

881-4027.9 * INSTALLATION AND OPERATING INSTRUCTIONS 8BT2 * Revision 04
Maintenance ensures undisturbed and uninterrupted operation of the switchgear.
The maintenance measures are divided into the following fields:
• Visual inspection
• Preventive maintenance
ATTENTION!
Maintenance work may only be performed in a careful manner by trained personnel
familiar with the characteristics of the individual switchgear, in accordance all relevant IEC
safety regulations and those of other technical authorities, and with other overriding
instructions.
Besides the recommended maintenance intervals, additional maintenance measures may be
required for operational reasons.
Recommended time schedule for maintenance measures
Every year or at the operator's
discretion
Every 5 years, or depending on
operational facts, or operator's
discretion
The visual inspection is performed every year or at the operator's discretion.
General check for paint damages on all panels of a switchgear assembly in the area of
the front doors, the lateral and the rear termination. If required, repair damages.
General check of the switchgear for dust layers. If needed, clean them with vacuum
cleaners.
General check for humidity. To do this, open the high-voltage door of the switching
device compartment of every third panel and check the switching device compartment
for humidity or condensation.
If there is humidity or condensation inside a switching device compartment, determine
the cause thereof. To do this, do also observe the climatic conditions of the switchgear
room, and arrange for suitable measures such as room ventilation or room heating.
General check for partial discharge noises. If there are any partial discharge noises,
determine the cause thereof and take adequate countermeasures.
Check whether the operating tools are complete (see Page70 "Operating tools").
When an earthing switch has performed two short-circuit making operations,
maintenance work has to be done by means of a visual inspection of the earthing switch
blades and the fixed laminated contacts. If there is any visible erosion, the stressed
components must be replaced. To do this, please contact the regional SIEMENS
representative.
Check the primary connections of current and voltage transformers.
Check the bolted joints (see clause Page64, clause 4.4, "Final installation work")
Carry out maintenance and servicing at shorter intervals (to be specified by the owner) if
there is a lot of dust, or if the air is extremely humid and/or polluted.
Grease the main contacts at:
• Moving rails
• Fixed contacts of the earthing switch
• Fixed contacts at bushings for the withdrawable contacts of circuit breaker
Interval
i.e. after a short circuit breaking / making operation
of a circuit breaker and / or an earthing switch
when the permissible number of operating cycles
has been reached.
Operational fact
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