CT Analyzer User Manual
122 OMICRON
Closes the excitation graph and brings you back to the Excitation card.
Moves the cursor to the knee point on the graph according to the selected standard.
If two or more knee points could be found on the graph, this soft key is alternately
labeled Knee Point 1 or Knee Point 2, depending on which knee point the cursor is
actually positioned to. By pressing the soft key you can switch between knee point 1
and knee point 2.
After opening the excitation graph, the cursor shows the topmost knee point (knee point
1) and the soft key is labeled Knee Point 2.
Moves the cursor to the knee point on the reference graph. This soft key is only
available if a reference graph is loaded.
If the reference graph loaded has two or more knee points, this soft key is alternately
labeled Ref. Knee Point 1 or Ref. Knee Point 2, depending on which knee point the
cursor is actually positioned to. By pressing the soft key you can switch between knee
point 1 and knee point 2.
After loading the reference graph, the cursor shows the topmost knee point (knee point
1) and the soft key is labeled Ref. Knee Point 2.
Opens the file system card to select a previous test in order to load the excitation curve
of this test as a reference curve and compare it with the current one.
The reference curve is displayed as a dotted line in addition to the excitation curve of
the actual test. If a reference curve is loaded, the values V
ref
, I
ref
and L
ref
are displayed
in addition to the measured values.
Switches off the reference curve from the display. If you have switched off the reference
curve, the soft key changes to Ref. On to switch the reference curve on again.
This soft key is only available if a reference curve has been loaded.
By pressing one of these soft keys you can display the measured excitation graph and
knee point as defined in the respective standard.
IEEE C57.13 displays the knee point for the 45° tangent. After pressing this soft key, its
labeling changes to IEEE C57.13 (30°) to enable the display of the knee point for the
30° tangent. 30° is recommended for gapped cores in IEEE C37.110, chapter 4.3.
Note: The test report only contains the graph for the standard selected in the CT-Object
card.
Table 8-23: Soft keys available for the excitation graph (continued)
Soft key Description
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