Omicron Lab CT Analyzer, User Manual

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CT Analyzer User Manual
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6.3 Burden Card
The Burden card 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 6-4 Burden card
If the CT Analyzer cannot reach the desired test current I
test
, an overload
message is displayed in the right-hand corner of the status line.
6.3.1 Test Settings
The following settings can be done 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.
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)