IL
44-751-1
Instruction
Leaflet
Page 11 November, 2001
Installation
Inspection upon Receiving
•
Before opening the shipping carton, check carton for any obvious signs of damage or
poor handling.
•
Open shipping crate and closely examine the tap changer components for any sign of
damage.
•
All DTW tap changers are shipped with the moving contacts in position 1. Please check
to verify that the moving contacts are indeed in position 1 before continuing. Refer to
Figures 14 and 15.
•
Verify that the shipment is complete and contains all components ordered.
•
Check that the type designation and shop order number agree with the delivery
documents (i.e. the packing list or ABB’s ordering acknowledgement). The shop order
number is stamped on the rating plate.
Required Tools and Materials
•
Wrench with 9/16-inch (14.3 mm)hex socket (for connection of leads to the tap deck and
for assembly of the aluminum shield casting).
•
Screwdriver with flat head (used together with 9/16-inch (14.3 mm) hex socket wrench in
assembly of aluminum shield casting).
•
Two wrenches with 3/4 inch (19 mm) hex socket (for tightening bolt and nut on external
operating mechanism).
•
Installation guide (this document).
Pre-installation Work Required by Customer
•
Make the appropriate size hole in the transformer tank according to the dimensions
shown in the tap changer outline drawing.
•
In addition to the hole required to accept the mounting boss and tap changer operating
mechanism, a hand hole will most likely be required in this vicinity to allow the final
mechanical connections to be made between the operating mechanism and the drive
shaft.
•
Weld the mounting boss/bosses (not supplied by ABB) to the transformer wall. These
welds must be gas-tight.
•
Prepare the transformer superstructure with holes for the assembly of each DTW deck.
Figure 14. Position 1 Left Hand Drive
Figure 15. Position 1 Right Hand Drive
