Omicron Lab CT Analyzer, User Manual

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CT SB2 User Manual
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2. In the CT-Object card, specify the CT data according to the CT’s name plate.
Specify the data in the order of the following table.
For more detailed information, please refer to section 6.1 on page 36.
Figure 4-1 CT-Object card with soft keys for predefined CT ratios if the
number of taps is set to 5
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.
Note: The CT data for the full tap combination can only be set
in the CT-Object card.
If the selected standard is IEEE C57.13 and the "Number of
Taps" is set to 5 or 3 in the
MR-Config. card, the
CT Analyzer offers soft keys with predefined ratios when the
"I-pn" field is selected with the cursor (see Figure 4-1). 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.
Note: The default number of taps can be set in the device
settings of the CT Analyzer , see chapter 5 on page 33.
If the selected standard is not IEEE C57.13, enter the values
for I
pn
and I
sn
manually.
Class Rated accuracy class of the CT. This field becomes available
after selecting the CT type (protection or metering CT).
VA (or Vb)
cos
ϕ
Nominal burden for the full tap combination of the CT.
For protection CTs of the IEEE C57.13 classes C, K and T,
enter the rated secondary terminal voltage V
b
instead of VA.
The CT Analyzer then automatically calculates the value for
VA.
The cos ϕ for the nominal burden is automatically selected
according to the standard.