OMICRON 107
Test cards for Advanced CT Test mode
8.3 Burden card
The Burden card of the Advanced CT Test mode is only available if it is enabled on the Select Cards
page (Default Test Card Selection or Select Cards soft key in the CT-Object card).
Using the Burden card, a current transformer’s secondary burden impedance can be measured with the
selected secondary current (I
sn
) at nominal frequency. If a current other than I
sn
should be used to test
the burden, the desired test current can be entered in the "I-test" parameter field.
No soft keys are available in the Burden card.
Figure 8-4: Burden card
If CT Analyzer cannot reach the desired test current I
test
, an overload message is displayed in the right-
hand corner of the status line.
8.3.1 Test settings
The following settings can be done in the Burden card.
Table 8-12: Test settings in the Burden card
Parameter Description
I-test Test current used to measure the external burden.
After clearing the test results or when starting a new CT test, the test current is automatically
chosen as follows:
It is possible to overwrite the default test current using the keyboard (0.1 to 5A). Always
verify the test current settings prior to starting the test in order to avoid damaging of
the CT or other equipment.
Press to open the main menu
Value for I-sn
in CT-Object card
Value for I-test
in Burden card
Test current used for
burden test
"?" none 1A
e.g. "?" e.g. 5A 5A (value of I-test)
e.g. 5A none 5A (value of I-sn)
e.g. 5A e.g. 1A 1A (value of I-test)
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