M
AVTMMTO3xx Rev 3 Sept 2013
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10. MTO300 - Select the form desired for use. This manual employs form number
56353/MTO300/330 Winding Resistance.
11. The form will be displayed and the user will be ready to start the process.
12. Selecting an existing form – this is handy for customers that have a form and
transformer configuration they are using on a regular basis.
a. MTO300 – File/Open or the file folder icon will give you the list of forms
on the machine. Select the template form and press enter.
b. MTO330 – Use Home screen Action Icons to select various functions
(including Preferences, Open, Save, New, Print)
13. Enter all of the header information with pertinent information. For users not using
PowerDB for asset management, there is a button to show header information; click
on it and the header will not appear on the form.
a. MTO300 can use the arrow keys, Tab and Alt Tab as well as a mouse to
traverse the header information.
b. MTO330 can use the arrow keys and Tab/Alt Tab to traverse the header
information.
14. Enter the transformer nameplate information. The transformer configuration field is
required. This is selectable through the left/right arrow on the graphic screen. The
transformer configuration dictates the test method of the instrument, if it is wrong,
the instrument will not present the result expected.
a. MTO300 can use the arrow keys, Tab and Alt Tab as well as a mouse to
traverse the header information.
b. MTO330 can use the arrow keys and Tab/Alt Tab to traverse the header
information.
15. Form Setting Button – Enter the information for the form. Key number is Allowed
Error %. This number is used to highlight winding to winding difference numbers
for a three phase transformer when they exceed this defined limit.
Calculation for % difference is (Phase 1 + Phase 2 + Phase 3)/3 = Average Value
Ph1 error = ABS(Phase 1 – Average Value)
Ph2 error = ABS(Phase 2 – Average Value)
Ph3 error = ABS(Phase 3 – Average Value)
Max Ph error/Average Value * 100 = Difference %
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