ABB UCL Installation And Commissioning Manual page 17

WARNING
Lowering the complete tap-changer to the floor
without support entails a risk for tipping, personal
injury and equipment damage.
6. Remove the transport locking and the lifting eyes with
fasteners from the top section of the tap selector; see
Fig. 8.
CAUTION
Do not operate the tap selector until it is connected to
the diverter switch housing.
7. Lift the diverter switch housing into position and fit the tap
selector to the diverter switch housing; see Fig. 9. The tap
selector drive pin must fit into the large gear wheel slot;
see view A-A.
CAUTION
The drive crank on the tap selector may only be
moved slightly to engage the slot in the large gear
wheel of the diverter switch housing.
8. Insert four M10x40 screws and washers through the tap
selector upper part to the four supports of the diverter
switch housing. Tighten the screws; see view E-E, Fig. 9.
WARNING
The diverter switch housing and the tap selector
contain moving parts. Observe caution!
9. Connect the supplied conductors between the diverter
switch housing and tap selector. The conductor ends and
their connecting points have the same markings. Fasten
the conductors with cleats. The number of conductors
varies depending on the rated through-current and the
type of connection.
WARNING
The wires coming from the transformer's regulating
winding may not pass through the spaces between
the change-over selector and the fine selector.
10. If the impulse withstand voltage to ground (BIL) exceeds
380 kV, insulate the connections on the tap selector
by winding paper around them to a thickness of
approximately 3 mm; see Fig. 7. The paper should be
of the same quality as used for insulation of conductors
within the active part of the transformer.
11. If the impulse withstand voltage to ground (BIL) exceeds
380 kV, mount the supplied shielding ring (TS 11) at the
bottom plate of the tap selector; see view D–D.
CAUTION
After mounting the shielding ring, the tap-changer
must not stand on the shielding ring.
12. Continue with Section 3.3.
~ 100 mm
Conductor
Insulating paper
Connection point
on tap selector
Fig. 7.
Transport locking
(to be removed)
Drive crank
Screw (to be
removed)
Fig. 8.
1ZSC000562-AAZ en | Installation and commissioning guide UCL/VUCL 17
Locking nut
Spring washer
Flat washers
Socket screw
Lifting eyes with
fasteners (to be
removed)