ABB UZE, Руководство по ремонту, Страница: 5 / 28

CAUTION
Take care to avoid ingestion of moist air when oil is drained. If the ambient air is moist, let
incoming air pass through a dehydrating breather with slow air flow to obtain proper dehy
-
dration.
Do not fill oil into the on-load tap-changer if the transformer tank is under vacuum and the
on-load tap-changer is not.
Do not fill oil into the transformer tank if the on-load tap-changer is under vacuum and the
transformer tank is not.
Mounting of gaskets
CAUTION
Sealing surfaces and gaskets must be clean and undamaged. Diametrically opposed bolts
in sealing joints must be tightened alternately several times, beginning with a low tighten
-
ing torque and finally with the recommended tightening torque as described in section 1.6
Tightening Torque, in this guide.
After oil filling
CAUTION
Do not energize the transformer earlier than three hours after oil filling in atmospheric pres -
sure. This waiting period is needed to allow airbubbles to disappear.