Omicron Lab CT Analyzer, User Manual

Page: 230 / 254

CT SB2 User Manual
36
6.1 CT-Object Card for Multi-Ratio CT Testing
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 6-1 CT-Object card with name plate data entered
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.
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.
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, the
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
(see Figure 6-2).
If you select one of these predefined multi-ratio schemes, the
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, 800 : 5, 300 : 5 and 200 : 5 (see Figure 6-3 on page
38).
Note: 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.
Class Rated accuracy class of the CT. This field becomes available
after selecting the CT type (protection CT or metering CT).
Fields underlined by dotted lines can be edited.
In multi-ratio test mode, the status line displays the
full tap combination of the CT.