Transformer Testing
AVTMTO210 Rev 7 Sept 2013
39
4. When measurements are complete, press to terminate and
discharge current. Discharge is complete when the discharge indicator is
off.
Demagnetizing a Transformer
The MTO demagnetizes the transformer by automatically magnetizing the core
of the transformer in the positive and negative direction with multiple cycles of
reduced current. The demagnetization function is equivalent to generating test
currents for multiple resistance tests. During the demagnetizations cycle, the unit
will display the number of cycles left in the process.
1. Demagnetization only needs to be accomplished once after all testing is
complete.
2. CURRENT and VOLTAGE leads should be attached to one phase/terminal
pair on high side (Primary) windings for more effective demagnetization.
3. Voltage Leads need to be attached. Just like a test. Discharge energy is
absorbed through the voltage leads.
4. Only one Winding needs to be demagnetized on a three phase transformer.
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