IL
44-751-1
Instruction
Leaflet
Page 17 November, 2001
Figure 23. Bevel gear and Operating mechanism
connected with the adjustable steel shaft.
D A N G E R
The next step verifies that the tap changer mechanism is working properly,
and should not be performed unless the transformer is de-energized.
Failure to do so will result in severe personal injury, property damage, or
death.
20. The DTW tap changer has now been installed and should be checked for proper operation.
To operate, pull out the locking pin until it disengages the Geneva Indicator Dial and turn the
operating mechanism handle one complete turn. This should put the tap changer into
Position number 2. Verify that the Geneva Indicator Dial reads “2” and verify that each tap
deck is in position 2. Continue verification through all positions. NOTE: all DTW tap
changers have the same Geneva Indicator Dial (i.e., the dial has 7 indicator positions) but,
depending on the actual tap changer ordered, the limits of operation will be controlled by
mechanical stops placed at the proper position within the indicating mechanism.
