OMICRON 47
CT Analyzer test cards for Advanced MR Test mode
9.1 CT-Object card for Advanced MR Test mode
Use the CT-Object card to specify the CT data according to the CT’s name plate. Specify the data in the
order of the following table.
Figure 9-1: CT-Object card with name plate data entered
Table 9-1: CT data in the CT-Object card
Parameter Description
I-pn
I-sn
Rated primary current for the full tap combination of the CT and rated
secondary current of the CT. These values specify the full tap ratio displayed in
the MR-Config. card. The full tap ratio of the CT can only be specified and/or
changed here.
Possible values for I-pn: 1 to 99000A.
Possible values for I-sn: 0.05 to 25A or soft keys 1.0A, 2.0A, 5.0A, 1.0A/√3,
2.0A/√3, 5.0A/√3. Default: As defined in the default test settings.
For IEEE C57.13 only:
If the selected standard is IEEE C57.13 and the "Number of Taps" is set to 3 or 5
in the MR-Config. card, CT Analyzer offers soft keys with predefined ratios for
3-tap or 5-tap CTs when the "I-pn" field is selected with the cursor.
If you select one of these predefined multi-ratio schemes, CT Analyzer
automatically specifies the ratios for all tap combinations in the MR-Config.
card. For example, selecting the 1200:5A soft key will result in nominal ratios
of 1200 : 5, 1000 : 5, 900 : 5 and 400 : 5.
Selecting a predefined multi-ratio scheme overwrites possibly existing settings
for I
pn
and I
sn
in the CT-Object card and the ratios in the MR-Config. card.
Standard Standard to be used for the CT test and the test assessment.
P/M * CT type. Set "P" for a protection CT or "M" for a metering CT.
* This parameter is relevant for assessment. No automatic assessment is
available if the user did not enter data for this parameter prior to the test
Fields underlined by dotted lines can be edited.
In multi-ratio test mode, the status line displays the full tap combination
of the CT.
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