ABB VUBB, Руководство пользователя

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1ZSC000562-AAL en | User’s guide VUBB 19
3.5.5 Filling under vacuum
Oil filling under vacuum can be carried out with the
conservator. After filling under vacuum, no standing time
is needed. The methods below ensure that no stipulated
pressure differences are exceeded.
CAUTION
To fill under vacuum, a vacuum-proof conservator
must be used.
1. Make a connection between the oil conservator for the
transformer and the oil conservator for the tap-changer.
Fig. 29.
Fig. 29. Vacuum filling overview.
Vacuum Vacuum Oil
Oil
Tap-changer Transformer
2. Open the valve between the tap-changer and the
conservator.
3. Close the oil valve.
4. Put the transformer under vacuum. (The tap-changer is
then put under vacuum automatically as well.)
5. Let oil in through the oil valve on the tap-changer. For
connection dimensions, see Fig. 30.
Fig. 30. Connection dimensions.
Ø75
Stud M10
O-ring
Ø20 Ø5.7
Ø44.2
6. When the oil level indicator has reached the correct level,
close the oil inlet. For correct oil level, see Section 3.5.3.
7. When atmospheric pressure is restored in the transformer,
remove the connection between the transformer and the
tap-changer.
8. Connect the breathing device to the oil conservator for the
tap-changer. Make sure the connection to the breathing
device is properly sealed.