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Table 6-3: Data to be specified in the MR-Config card (continued)
Parameter
Taps
Ipn : Isn (A)
VA
cos ϕ
or
Burden
cos ϕ
OMICRON
CT testing in Advanced MR Test mode ("New Advanced MR Test")
Description
This column lists all possible tap combinations of the CT (e.g. X1-X5, X1-X4,
X1-X3, ...). The number of available tap combinations depends on the number
of taps specified in the "Number of Taps" field.
When the MR-Config. card's tab is highlighted you can select whether X1 or
the highest available tap is used as the common tap. The default common tap
can be selected in the device settings of CT Analyzer, see chapter 7 on page
32.
Using the Show Inter Taps soft key you can display the intertap combinations
instead of the tap combinations. If the intertap combinations are displayed, the
soft key changes to Show Taps.
Enter the nominal ratio for each single tap combination.
If you selected a predefined multi-ratio scheme for IEEE C57.13 in the
CT-Object card, this column is automatically filled with predefined ratios for all
tap combinations.
If you entered I
and I
pn
the I
for each tap combination in this column. I
pn
CT-Object card.
CT Analyzer automatically performs a plausibility check for the ratios entered by
the user. For example, an error message is displayed if the I
X1-X3 is higher than the I
The data for the full tap combination can only be set in the CT-Object card.
Nominal burden for each tap combination.
To obtain correct measurement results, the nominal burdens for the inner tap
combinations (e.g. X1-X2 etc.) should be smaller than the nominal burden for
the full tap combination according to the winding ratios of the tap combinations
(e.g. 25 VA for X1-X5, 12.5 VA for X1-X4 etc.). CT Analyzer supports this with
an automatic function.
As soon as the primary current I
CT Analyzer automatically calculates and sets the corresponding nominal
burden and cos ϕ for this tap combination. The nominal burden (VA)
automatically assigned by CT Analyzer can be changed manually by the user
for all tap and intertap combinations except the full tap combination.
The "VA" column is displayed by default when opening the MR-Config. card the
first time after initializing a new test in the Advanced MR Test mode. Using the
Op. Burden soft key you can display the "Burden" column instead.
Operating burden and cos ϕ for each tap combination.
This column displays for each tap combination the operating burden and cos ϕ
specified in the CT-Object card. The values cannot be changed by the user.
The "Burden" column is displayed if you selected to display the operating
burden using the Op. Burden soft key.
manually in the CT-Object card, you have to specify
sn
specified for X1-X4.
pn
is specified for a tap combination,
pn
is always taken from the
sn
entered for
pn
29
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