Primary Winding Resistance Measurement; Secondary Winding Resistance Measurement - Omicron CT SB2 User Manual

8.5.1

Primary winding resistance measurement

Measuring the primary winding resistance is only required in case of a perceptible primary winding
resistance, i.e., if the primary winding actually consists of multiple turns.
Primary winding resistance measurement is performed prior to the CT test and requires special wiring.
Note: If no CT test is performed following the primary winding resistance test, a demagnetizing cycle is
performed after the test to guarantee complete demagnetization of the CT.
Running the primary winding resistance measurement
1. Press the Select Cards soft key in the CT-Object card to open the Select Cards page. Enable the
Primary winding resistance measurement in the Select Cards page. Press the Back soft key to
apply your selection and return to the CT-Object card.
Figure 8-11: Select Cards page with Primary winding resistance measurement enabled
2. Execute the test as described in section 5.2.3 on page 57.
WARNING
Death or severe injury caused by high voltage or current possible
This measurement is performed with DC current.
► Do not open the measurement circuit while current is flowing.
► Stop the measurement by pressing the
LED is off before opening the measurement circuit.
8.5.2

Secondary winding resistance measurement

During the CT test, secondary winding resistance measurement is necessary since the CT winding
resistance is needed for particular calculations in the excitation and ratio test. This measurement is
performed completely automatically.
Note: If only the secondary winding resistance test is selected, a demagnetizing cycle is performed after
the test to guarantee complete demagnetization of the CT.
OMICRON
Test cards for Advanced CT Test mode
key on CT Analyzer and wait until the red
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