Megger MTO106, User Manual

Page: 15 / 20

BN034794AE ZP-BN01E MTO106 15
5 APPLIcATION EXAMPLES
5.3 Manual
demagnetization of a
transformer
The MTO106 does not include and automated
demagnetization feature and demagnetization, if
deemed necessary, must be performed manually
according to the method below.
1]
Run a normal winding resistance test accord-
ing to the instructions in section "4.2 Testing
Single and Dual windings" on page 12.
2]
Swap the terminals, preferably by swapping
the Kelvin clamps, select the next lower test
current and inject current until the current
reading has reached at least 50% of the set
value.
3]
Repeat step 2 for each test current range
down to the lowest selectable test current
value.