ABB UCL, Installation And Commissioning Manual

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Installation and commissioning guide UCL/VUCL

   47

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.