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3.2.1 Mounting when the transformer ratio measurement
is carried out before drying
1. Assemble the diverter switch housing and the tap selector
according to Section 3.1.3, steps 1, and 4-12.
2. Lift the tap-changer onto the yoke fork (use the lifting eyes
at the top of the tap-changer; see Fig. 4). Place the tap-
changer in position for mounting the outer shaft system
(see transformer drawings). Insert and tighten the supplied
guide pins DS 7 and insulating bushings (not included in
delivery) in the lower flange; see Fig. 11. The guide pins
must be secured by center punch marks in the pins.
3. Mount the conductors between the regulating winding and
the tap selector according to Section 3.3.
4. Carry out transformer ratio measurement according to
Section 3.4 in this guide.
5. Remove the diverter switch housing cover (see Fig. 13)
by removing the screws. Store the cover, fasteners and
O-ring at a dust-free location.
6. If the vapor phase process will be used: Remove the plug
in the T-coupling for the oil drainage tube. To open the
bottom valve, let the bottom valve key (DS16), slide down
through the oil drainage tube, and when it has gripped
the valve, rotate it in a counter-clockwise direction until it
stops after approximately 6 turns; see Fig. 14. Refit the
plug.
Fig. 11.
20 Installation and commissioning guide UCL/VUCL | 1ZSC000562-AAZ en
7. Remove the diverter switch by carefully lifting it straight
out of the diverter switch housing by its lifting eye; see
Fig. 13. Store the diverter switch at a dry and dust-free
location.
WARNING
For VUCL: The vacuum interrupters are sensitive and
the diverter switch must thus be handled with care.
8. Remove the oil drainage tube by hand or by means of a
pipe wrench, placing a cloth between the tube and the
pipe wrench to protect the tube. Store the tube in the
diverter switch housing until it is remounted.
9. Remove the four clamp screws, M10 x 35, and the
washers that hold the bevel gear; see Fig. 13. Note the
position of the bevel gear. Carefully remove the gear
housing, and put the parts in a safe place. Store the bevel
gear at a dust-free location.
CAUTION
Do not remove the locking device for the bevel gear.
10. Mount the locking device DS 4 on the drive shaft of the
tap-changer.
Upper flange
O-ring
Lower flange
Yoke fork
Diverter switch housing
Secure with center
punch marks
Insulating bushing
(not included)
Guide pin DS 7
(outer diameter = 12 mm)
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