Transport; Dismantling Before Transport; Dismantling Preparations; Removal Of The Vertical Drive Shaft - ABB UCL Installation And Commissioning Manual

8. Transport

8.1 Dismantling before transport

The tap-changer is usually transported without accessories
(pressure relay, motor-drive mechanism, bevel gear and drive
shafts) to prevent damage to these parts. To make sure that
everything is set up properly on site with a minimum amount
of work, it is important to put the tap-changer at the position
and operated from the position given in the single-phase
diagram delivered with the unit, and to fit locking devices
properly during dismantling at the transformer factory.
Removal of the motor-drive mechanism and drive shafts is
performed in the opposite order of assembly.

8.1.1 Dismantling preparations

Before dismantling, mark the parts to facilitate
identification.
Check the position of the motor-drive mechanism according
to Fig. 24 (BUE) or Fig. 25 (BUL). Use the hand crank to
adjust it to its exact position. Install the locking device on the
motor-drive mechanism; see Fig. 44.
The arrangement of the drive shaft system is shown in Fig. 26.

8.1.2 Removal of the vertical drive shaft

1. Loosen the hose clips holding the protective tubes to the
bevel gear and motor-drive mechanism. Push one of the
protective tubes into the other. Remove the screws holding
the bevel gear SA21. Detach the bevel gear by carefully
lifting it off the shaft while holding the vertical drive shaft.
Detach the vertical shaft including the protective tubes by
lifting it off the coupling of the motor-drive mechanism.
Mark the parts.
2. Pack screws, clamps, protective tubes, shafts, hose clips,
protective cover, coupling halves, bevel gear and seals for
transportation to the site.

8.1.3 Removal of horizontal drive shaft for one unit

1. Lock the bevel gear with the locking device, and two set
screws see Fig. 36.
2. Loosen the hose clips holding the protective tubes to
the bevel gears. Push one of the protective tubes into
the other. Loosen the screws holding the coupling halves
at one end of the shaft and detach them. Detach the
horizontal shaft. Mark the parts.
3. Pack screws, clamps, protective tubes, shafts, hose clips,
protective cover, coupling halves, bevel gear and seals for
transportation to the site.

8.1.4 Removal of horizontal drive shafts for two units

1. Detach the protective cover SA33 on the bevel gear of
unit -2, and lock the bevel gear with the locking device
marked -2, and two set screws; see Fig. 36.
2. Loosen the hose clips holding the protective tubes to the
bevel gears for units -1 and -2. Push one of the protective
tubes into the other. Loosen the screws holding the
coupling halves at one end of the shaft and detach them.
Detach the horizontal shaft between units -1 and -2.
3. Lock the bevel gear for unit -1 with the locking device
marked -1, and two set screws.
4. Loosen the hose clips holding the protective tubes to
the bevel gear SA21 and the bevel gear of tap-changer
unit -1. Push one of the protective tubes into the other.
Loosen the screws holding the coupling halves at one end
of the shaft and detach them. Detach the horizontal shaft
between unit -1 and bevel gear SA21. Mark the parts.
5. Pack screws, clamps, protective tubes, shafts, hose clips,
protective cover, coupling halves, bevel gear and seals for
transportation to the site.

8.1.5 Removal of horizontal drive shafts for three units

1. Detach the protective cover SA33 on the bevel gear for
unit -3, and lock the bevel gear with the locking device
and set screws marked -3; see Fig. 36.
2. Loosen the hose clips holding the protective tubes to
the bevel gears of unit -2 and unit -3. Push one of the
protective tubes into the other. Loosen the screws holding
the coupling halves at one end of the shaft and remove
them. Detach the horizontal shaft between units -2 and -3.
3. Lock the bevel gear for unit -2 with the locking device
marked -2 and two set screws.
4. Loosen the hose clips holding the protective tubes to the
bevel gears of units -1 and -2. Push one of the protective
tubes into the other. Loosen the screws holding the
coupling halves at one end of the shaft and remove them.
Detach the horizontal shaft between units -2 and -1.
5. Lock the bevel gear for unit -1 with the locking device
marked -1 and set screws; see Fig. 43.
6. Loosen the hose clips holding the protective tubes to
the bevel gear SA21 and the bevel gear for tap-changer
unit -1. Push one of the protective tubes into the other.
Loosen the screws holding the coupling halves at one end
of the shaft and remove them. Detach the horizontal shaft
between unit -1 and bevel gear SA21. Mark the parts.
7. Pack screws, clamps, protective tubes, shafts, hose clips,
protective cover, coupling halves, bevel gear and seals for
transportation to the site.
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