Mounting Of External Drive Shafts; Mounting Of Vertical Drive Shaft - ABB UCL Installation And Commissioning Manual

5.2 Mounting of 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.
The square shafts and protective tubes must be cut before
mounting.
CAUTION
Before mounting of 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 of the bevel
gears.
The multi-hole couplings should be greased.
The inclination of the shaft (the square tube) must not be
more than 40 (=70 mm for every 1000 mm shaft length).
The tubes around shafts and couplings are for
protection.
The arrangement of the drive shaft system is shown in Fig. 26.
CAUTION
Make sure that all locking devices (on the bevel
gear, on the tap-changer and in the motor-drive) are
mounted and the tap-changer and the motor-drive are
at the same service position.
Check that the motor-drive mechanism is at its exact position
according to Fig. 24 or 25. (BUE: The red mark on the brake
disk facing the red mark on the brake assembly. BUL: The
roller in the middle of the notch in the cam disk). If not, loosen
the locking device (see Fig. 44) and adjust it to the exact
position. Remount the locking device.
Let the parts of the shaft system that should be
removed before transporting the transformer to the
site keep their identification numbers according to the
packing list to simplify remounting of the shaft system
on site.
34 Installation and commissioning guide UCL/VUCL | 1ZSC000562-AAZ en

5.2.1 Mounting of vertical drive shaft

1. Mount the bevel gear SA21 on the transformer, with O-ring
SA20, four clamps SA17, hex head bolts M10, SA18 and
washers SA19; see Fig. 26.
2. Determine the distance K2 between the spherical shaft
ends; see Fig. 27.
3. Cut the vertical square shaft, SA14, to length = K2 minus
6 mm. Remove burrs.
4. Cut the protective tubes SA15 and SA16 to the same
length LB2 according to Table 4.
K2 = 200 to 290 mm K2 = 291 to 600 mm
K2+180 mm
LB2 = LB2 =
2
Example:
K2 measured at 350 mm. LB2 is then =
Table 4. Lengths for LB2.
5. See Fig. 32. Fit two coupling halves, SA11, on one end of
the square shaft with six screws SA12 and washers SA13.
Push the shaft to the bottom of the fitting in the coupling
halves. Tighten the two screws; A first and then the other.
Fit the two protective tubes, SA15 and SA16, (the larger
diameter at the top) and two hose clips SA10; see Fig. 29.
6. See Fig. 28. Connect the square shaft with the mounted
coupling halves to the shaft of the bevel gear. Mount two
coupling halves SA11 to the other end of the square shaft
and the shaft of the motor-drive mechanism. Push the
shaft to the bottom of the fitting in the coupling halves;
see Fig. 31. Tighten the screws lightly and check that
the shaft can be moved approximately 2 mm in the axial
direction (axial play). Check the dimension shown in
Fig. 30. Tighten the two screws; A first and then the other.
7. See Fig. 29. Mount the tube with the larger diameter,
SA16, to the bevel gear with a hose clip and the other
SA15 to the flange on the motor-drive mechanism with a
hose clip. Leave about 3 mm of play to the flange ring for
water drainage.
The tube with the larger diameter is mounted on the
bevel gear.
Tighten the two screws; A and then the other,
according to Fig. 32.
K2 = greater than 600 mm
K2+220 mm K2+410 mm
LB2 =
2 2
350+220 570
= = 285 mm
2 2