Omicron Lab CT Analyzer User Manual page 56

CT Analyzer User Manual
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Figure 4-6 CT test: Wiring check message (left) and wiring diagram
(right)
7. Press the Start Test soft key to execute the automatic CT test.
Note: If you do not want to perform the CT test, press Skip Test to skip the
CT test or Cancel Test to abort the complete test.
8. Automatic test step 1: CT resistance measurement
The CT Analyzer measures the secondary winding resistance of the CT.
9. Automatic test step 2: Determination of the excitation characteristic
The CT Analyzer measures the excitation curve and determines the knee
point and other important CT data.
10.Automatic test step 3: Ratio measurement
The CT Analyzer then measures the current ratio error, the phase error, the
composite error and the polarity. The CT Analyzer calculates the ratio error
for the operating burden (parameter "Burden" in the CT-Object card) and the
nominal burden (parameter "VA" in the CT-Object card).
11."Test finished" message
When the test is over, the red LED stops flashing and the green LED is on.
The CT Analyzer displays a "Test finished" message showing the status of
the test execution and the overall test assessment (see Figure 4-7).
Press any key on the keyboard to close this message.
Figure 4-7 Test finished message when the test is over