OMICRON 35
CT Analyzer test cards for MR Test mode
8.1 CT-Object card for MR Test mode
Use the CT-Object card to specify the CT data according to the CT’s name plate.
Figure 8-1: CT-Object card with name plate data entered
Table 8-1: Parameters and settings in the CT-Object card for the MR Test mode
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 : 5 A 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 according to which the test has to be performed.
Possible values: Soft keys IEC 60044-1, IEC 60044-6, IEEE C57.13 or IEC 61869-2
Default: Standard defined in the default test settings.
f Rated frequency of the CT.
Possible values: Value between 16 and 400 Hz or soft keys 16.7Hz, 50Hz, 60Hz or
400Hz.
Default: Frequency defined in the default test settings.
P/M Definition of CT type: Protection or metering CT.
Possible values: Soft keys Prot. CT, Meter. CT.
Default: As defined in the default test settings.
The status line displays the full tap combination of the CT.
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