Commissioning; Connection To The Oil Conservator; Mounting The Motor-Drive Mechanism And The Drive Shafts; Mounting Of The Motor-Drive Mechanism - ABB UCL Installation And Commissioning Manual

9. Commissioning

This chapter describes tasks to be carried out on the tap-
changer when the transformer is being installed and tested on
site.
CAUTION
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.
Fig. 1 shows the arrangement of the tap-changer, motor-drive
mechanism and drive shafts.
The pressure relay is usually delivered in a separate package
and installed upon commissioning. Depending on the
transport requirements, the transformer may be delivered with
or without the motor-drive mechanism and drive shaft system
attached. The tap-changer may be delivered filled with oil or
without oil. Use the relevant parts of this manual to perform
commissioning.
For information about tools, materials and oil required, see the
relevant parts of Chapter 1.

9.1 Connection to the oil conservator

Follow the appropriate parts of the instructions in Section 5.5.
Connect the cables to the low level alarm contact on the oil
level indicator.
9.2 Mounting the motor-drive mechanism and the drive
shafts
The motor-drive mechanism and drive-shaft system
should have been assembled and disassembled in the
transformer factory according to the instructions in this guide.
Locking devices should have been installed when it was
disassembled. If all locking devices are in place according to
the transport sections in this guide, there should be no need
for adjustments.
If necessary, Sections 5.1 and 5.2 provide complete
information for fitting and adjusting of the shaft system. The
arrangement of the drive shaft system is shown in Fig. 26.
Check all fittings and alignments, even if the shaft
system has been set up in the transformer factory.
The identification numbers on critical parts from the
packing list are specified in the following instructions;
see Sections 5.1 and 5.2.

9.2.1 Mounting of the motor-drive mechanism

See Figs. 24 and 25. Proceed as follows:
1. Mount the motor-drive mechanism on the transformer. The
mounting holes on the transformer should be level within
1 mm. If adjustment is needed, shims should be used.
2. Install the bevel gear, SA21, on the edge of the
transformer cover.
3. Check that the position indicator on the motor-drive
mechanism shows the same position as the indicator
inside the bevel gear of the tap-changer.
4. Remove the drying agent inside the cabinet.
WARNING
Do not energize the transformer before the tap-
changer and the motor-drive mechanism are correctly
assembled.

9.2.2 Mounting of the external drive shafts

The external drive shafts consist of square tubes and should
be connected to the spherical shaft ends on the bevel gears
and motor-drive mechanism by means of two coupling halves.
CAUTION
Before mounting shafts and couplings, everything
must be cleaned and greased for correct function and
to avoid corrosion.
Apply a thin layer of grease, GULF 718EP Synthetic Grease
or Mobil Grease 28 or SHELL Aero Shell Grease 22 to all
spherical shaft ends and unpainted surfaces on the bevel
gears.
The multi-hole coupling should be greased.
The tubes around shafts and couplings are for
protection.
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