Installation and commissioning guide
1ZSC000562-AAK EN, REV. 2, 2019-07-03
53
7 Oil-filling
7.1 Preparations
Overview
The transformer can be oil-filled with one of with these two processes:
•
Atmospheric oil-filling process
•
Vacuum oil-filling process
The tap-changer cylinder can withstand a vacuum on one side and atmospheric pressure on the other side.
The transformer-oil quality
The oil volume of the tap-changer is approximately 300 liter.
Requirement
Standard
The oil quality must be LC set -30°.
IEC 60296:2012
The oil must fully comply with this standard.
IEC 60422:2005
The correct oil-level
It is important that the oil-levels of both oil conservators are the same.
CAUTION!
The oil level of the tap-changer oil conservator must not be higher than the oil-level in the
transformer oil-conservator.
When filling the tap-changer with transformer oil, it is important to adjust the oil-level to the current ambient
temperature.
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