ABB UCL Installation And Commissioning Manual page 10

Horizontal drive shafts
and protective tubes
Bevel gear
Vertical drive
shafts and
protective tubes
Rating plate
Hand crank
(inside the cover)
Motor-drive
mechanism
Fig. 2. Example of on-load tap-changer systems.
10 Installation and commissioning guide UCL/VUCL | 1ZSC000562-AAZ en
Bevel gear
Shielding caps
(only for insulation
level above 380 kV)
Shielding rings
(only for insulation
level above 380 kV)
Not used for selector, size C
Unit -1
Unit -1 Unit -2
Unit -1 Unit -2
Type of connection, N or E
Type of connection, B
Type of
connection, T
Unit -3