Mounting Of Horizontal Drive Shaft For One Unit - ABB UCL Installation And Commissioning Manual

5.2.2 Mounting of horizontal drive shaft for one unit

The following applies to the fitting of the drive shaft and
protective tube when the tap-changer consists of one unit,
UCL.N/VUCL.N or UCL.E/VUCL.E.
1. Determine the distance K1 between the spherical shaft
ends; see Fig. 33.
2. Cut the horizontal square shaft SA22 to length = K1 minus
6 mm. Remove burrs.
3. Cut the protective tubes SA23 and SA24 at the non-
slotted end to the same length LB1 according to Table 5.
Protective tube SA23 has one slotted end.
K1 = 170 to 290 mm K1 = 291 to 600 mm
K1+200 mm
LB1 = LB1 =
2
Example:
K1 measured at 400 mm. LB1 is then =
Table 5. Length for LB1.
If K1 is greater than 600 mm, the mounted tubes
must overlap by at least 300 mm. Removal and
inspection of the couplings should be possible when
one of the tubes is pushed into the other.
4. Mount 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; see Fig. 31. Tighten the two screws; A first and
then the other; see Fig. 32. Mount the two protective
tubes, SA23 and SA24, the slotted end of SA23 in the
non-overlapping end, and two hose clips SA10; see
Fig. 34.
5. Remove the locking device on the bevel gear of the
diverter switch housing by loosening the two set screws;
see Fig. 36.
6. Connect the square shaft with the mounted coupling
halves to the shaft of the bevel gear SA21; see Fig. 38.
Mount two coupling halves SA11 to the other end of the
square shaft and to the shaft of the bevel gear on the
tap-changer. Push the shaft to the bottom of the fitting in
the coupling halves; see Fig. 31. Lightly tighten the screws
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; see Fig. 32.
36 Installation and commissioning guide UCL/VUCL | 1ZSC000562-AAZ en
K1 = greater than 600 mm
K1+250 mm K1+500 mm
LB1 =
2 2
400+250 650
=
2 2
7. See Figs. 24 and 25. The motor-drive mechanism and the
tap-changer should have the same indicated tap position
and be in their exact positions. Remove the cover of
the gear box on the tap-changer to access the position
indicator.
The motor-drive mechanism and tap-changer are in the
same position when the position indicators on both of
them show the same position.
The motor-drive mechanism is at the exact position since
the steps in Section 5.2 have been carried out.
The tap-changer is in the exact position when the window
where the position is read on the bevel gear is exactly
facing the red mark in the gear box housing.
If the gear box is not at its exact position, loosen the two
screws in the multi-hole coupling on the gear box and find
the position of the screws that positions the opening in the
brass-toothed wheel closest to the red mark in the gear box
housing. The maximum deviation from exact alignment is
given in Figs. 24 and 25. Tighten the screws. Remount the
= 325
cover and the gasket of the gear box on the tap-changer; see
mm
Fig. 17.
WARNING
Assembly with the tap-changer and the motor-drive
mechanism at different operating positions may cause
transformer failure.
WARNING
The bevel gear contains moving gears. Observe
caution!
8. Push the two protective tubes onto the bevel gears and
clamp them with hose clips, SA10; see Fig. 39.
The slot on the protective tube SA23 should be facing
downwards.
Apply the self-adhesive information plates SA25 around
the tubes at about the middle of the tube length.
Carefully turn the multi-hole coupling on the gear box until
the gear box is at the exact position. Find the two holes
matching each other in the multi-hole coupling and refit
the two screws.