Transport; General; Transport Preparations - ABB UBB Series Installation And Commissioning Manual

8. Transport

8.1 General

If the transport dimensions allow, the transformer may be
transported without dismantle any parts of the tap-changer.
If the motor-drive mechanism or any parts of the shaft system
has to be dismantled for the transport, the parts must be
marked to ensure they can be set up properly on site and with
a minimum of work.
If any of the accessories on the tap-changer has to be
dismantled, the openings on the tap-changer should be
protected with transport covers.

8.2 Transport preparations

Transport of the tap-changer mounted in the transformer
should be prepared as described below.
8.2.1 Transport with complete transformer
In this case the oil conservator is connected to the tap-
changer during transportation. The tap-changer should be
filled with oil to normal operating level.
8.2.2 Transport with dismounted conservator
If the conservator is to be dismounted during transport the oil
level in the tap-changer has to be lowered.
1. Connect a pump to the oil valve and suck out oil until the
oil flow stops. The oil level will then be 300-400 mm below
the top cover.
2. Disconnect the conservator and the pump.
3. Protect the openings with covers.
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.
8.2.3 Protection of motor-drive
The motor-drive mechanism must be protected against
condensation. Energize the heater when power is available.
When not, put drying agent inside the motor drive cabinet and
seal the vents.
38 Installation and commissioning guide UBB | 1ZSE 5492-118 en, Rev 5