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Application
For the winding resistance, the first 4 columns (Tap, Rmeas in Ω, Dev. in % and
Rref in
Ω) of the measurement table are relevant.
Figure 3-8 Measurement table with relevant columns for winding
resistance measurement
Editing the Tap
Number
It is possible to edit the tap number during or after a test.
You can publish the results in a report. To do so, change to File Operations.
After the test has been finished, you can delete a result line by selecting the
result line you want to delete and pressing the Clear Results menu key.
Tap Changer Test
and Measuring
the Winding
Resistance
When testing a tap changer, we recommend:
• To inject the same current value for each phase.
• To perform tests of each phase, start with the lowest tap through to the
highest and continue backwards down to the lowest tap again.
Measurements may show quite different results depending on the direction
of the tap movement and defects can behave differently. An interruption
caused by a defective tap changer results in comparatively high measured
values for ripple and slope.
For the tap changer test, the last 2 columns of the table are relevant.
Figure 3-9 Measurement table with results of tap changer and winding
resistance test
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General