Omicron Lab CT Analyzer, User Manual

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CT Analyzer User Manual
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6.5.1 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 key soft 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 6-11 Select Cards page with Primary winding resistance
measurement enabled
2. Execute the test as described in section 4.3 on page 52.
6.5.2 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.