WARNING
There is always a cushion of explosive gases in the
top of the diverter switch housing. No open fire, hot
surfaces or sparks may be present during opening
of the housing or draining from the valve. After the
cover is removed let the gas vent away approximately
15min before any work is started.
WARNING
Be aware of the risk for slipping caused by oil spillage,
for instance when working on the transformer cover.
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 dehydration.
CAUTION
Do not fill the diverter switch housing with oil if the
transformer tank is under vacuum and the on-load
tap-changer is not.
CAUTION
Do not fill the transformer tank with oil if the on-load
tap-changer is under vacuum and the transformer
tank is not.
CAUTION
Leave a gas cushion on top of the oil in the diverter
switch housing.
After oil filling
CAUTION
Do not energize the transformer earlier than three
hours after oil filling at atmospheric pressure. This
waiting period is needed to allow air bubbles to
dissipate.
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 tightening torque and finally with
the recommended tightening torque as described in
section 1.3 Tightening torque, in this guide.
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