Standard Configurations - ABB DTW Application, Installation & Selection Manual

IL 44-751-1
Instruction Leaflet
Page 10 November, 2001

Standard Configurations

The type DTW tap changer is built in three standard configurations based on mounting the tap
decks along the side of each phase coil. The operating mechanism may be ordered for mounting
on either the left or the right hand side of the tap decks (when viewed from outside of the
transformer). An ordering data sheet is provided to permit the customer to specify configuration,
mechanism location, critical spacing dimensions and electrostatic shielding requirements. This
information is necessary before a complete order can be entered for a tap changer.
♦ Configuration A: One tap deck per phase coil, (three tap decks in total). The operating
mechanism and shafts are aligned horizontally with the tap deck. The external operating
mechanism is located at the approximate vertical center of the tap deck. See Figure 11. An
optional, external gear box and mechanism set is available which permits the external
operating mechanism to be located at ground level. This is called Configuration C
♦ Configuration B: Two tap decks per phase coil, (six tap decks in total). In this configuration,
two sets of operating shafts are brought to the outside of the transformer in two gearboxes.
The mechanical connection between the two sets of deck drive shafts being made through
appropriate gearing and shafting within and between the two gearboxes. See Figure 12.
♦ Configuration C: Same as configuration A except the bevel gear set and operating
mechanism of Configuration B are used to lower the height of the operating mechanism. This
configuration is used when the operating mechanism must be located close to ground level.
See Figure 13.
Figure 11. Configuration A
Figure 13. Configuration C
NOTE: Figures show operating mechanisms and bevel gears on both sides of the tank. This is
for illustration purposes only to show that the parts can be assembled on either side of the tap
changer. When installing the tap changer only one operating mechanism set is needed
Figure 12. Configuration B