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6 Maintenance
6.1 Recommended maintenance
General
The bushings are maintenance free, no regular maintenance is necessary.
DANGER!
Risk of electrocution!
Do not go near the bushing while it is energized, or ungrounded. High voltages can kill you.
Make sure that the bushing is de-energized, and grounded before you do work on it.
Measurement of capacitance and dissipation factor
Please refer to Measurement of capacitance and dissipation factor, page 48.
Thermovision (infrared camera) check for local overheating on connectors
At the maximum rated current, the bushing outer terminal normally operates at a temperature of about
+35 °C to +45 °C above the ambient temperature. Significantly higher temperatures can be a sign of bad
connections, especially at lower current loading.
Checking of oil leakage
Make a visual inspection for oil leakage during regular station supervision.
After repairs
ABB recommends that the capacitance is measured after repairs have been done, after maintenance of
connected equipment, or after work near the bushing is completed.
It is important to compare the capacitance before energization with the capacitance that was measured at
commisioning. A change in capacitance gives indication of a fault. Refer to Measurement of capacitance and
dissipation factor, page 48.
Installation and maintenance guide
1ZSC000563-AAB EN, REV. 6, 2019-09-12
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