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4.6 Oil-filling
Overview
Start this procedure when the transformer oil has reached the bottom of the bushing.
•
This procedure is NOT applicable if the transformer is oil-filled with the vacuum process.
The purpose of this procedure is to remove as much air as possible from the center tube of the bushing.
Because air is soluble in transformer oil, air will go into the transformer oil and will cause its performance to
deteriorate. The amount of air that can be removed depends on the bushings position in relation to the
transformers oil-conservator.
Oil spillage
Oil spillages that are not removed can be misstaken for oil-leakage at a later time, it is thus important to
remove them.
Procedure
1.
Make sure that the transformer oil-level is less
than 30 mm from the flange.
Installation and maintenance guide
1ZSC000563-AAB EN, REV. 6, 2019-09-12
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