7
Maintenance
The chapter describes the activities and tests for maintenance of the bushing.
7.1
Maintenance schedule
Maintenance work
Interval
Described in ...
Check and clean insulator
surface
Check: Annually or
together with transformer-
maintenance
Cleaning: Only with acute
necessity
on page 41
Check bushing electrically
After the first 7-10 years of
operation
Thereafter according to
the measurement result
at intervals of 3 years or
fewer
on page 43
Check the temperature using a
thermal image
At the discretion of the
operator
on page 48
7.2
Check and clean insulator surface (silicone insulator)
The insulator surface is water repellent (hydrophobicity). Discharge traces on the insulator
surface change the water repellent features of the composite insulator.
► Make a visual check of the composite insulator for discharge traces and material damage.
► In the event of discharge traces, find out the cause of the discharges and eliminate them.
► Rectify any material damage.
Range STARIS®-Sia+
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