Accessories; Oil Level During Transport; Transformer Filled With Oil; Conservator Mounted - ABB UCL Installation And Commissioning Manual

8.1.6 Accessories

If the pressure relay is to be removed, see the assortment
guide, .
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If other accessories are to be removed for transport reasons,
pack them in the packages they were delivered in and refit the
transport covers. Fit the O-rings and tighten the nuts.

8.2 Oil level during transport

The following adjustments of the oil level should be carried
out when the tap-changer is to be transported.
CAUTION
Take care to avoid intake of moist air when oil is
drained. If the ambient air is moist, let incoming air
pass through a dehydrating breather with a slow air
flow to obtain proper dehydration.

8.2.1 Transformer filled with oil

When the transformer is transported filled with oil, the tap-
changer should also be transported filled with oil.

8.2.1.1 Conservator mounted

The diverter switch housing should be filled to the normal
operating level, and the valve for the conservator should be
open.
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8.2.1.2 Conservator unmounted

The oil level of the diverter switch housing should be lowered
to 150 mm below the upper edge of the housing.
When the conservator is removed, take off the cover of the
diverter switch housing and drain the oil with a pump to
150 mm below the upper edge of the housing. Refit the cover.
Turn the cover so that the guide pin in the housing is facing
the guide hole in the cover. Make sure the gasket is properly
positioned. Seal all flange connections by fitting gaskets and
covers. Close all valves.

8.2.2 Transformer drained

When the transformer is transported without oil, the tap-
changer should also be transported without oil.
8.2.2.1 Conservator mounted
Drain the oil from the diverter switch housing by means of a
pump connected to the oil valve. Let the tap-changer maintain
contact with the ambient air through the breathing device on
the conservator.
8.2.2.2 Conservator unmounted
Drain the oil as described in Section 8.2.2.1. Now remove
the conservator connection. Seal the diverter switch housing
against ambient air by fitting covers with gaskets and closing
all valves.