Ct Ratio Measurement - Omicron Lab CT Analyzer User Manual

8.6

CT Ratio Measurement

Caution: CT ratio measurement using Quick Test is not a complete CT test!
This measurement only determines the current ratio of CTs. The CT Analyzer
does not perform automatic demagnetization after the measurement.
This is a predefined measurement type, intended especially for the quick
How to get there:
measurement of CT ratios.
Press the Main soft key in
any test card
To select the CT Ratio measurement type, use the
Main Menu:
cursor to the Measurement Type field in the CT-Quick card and then press the
- New Quick-Test
CT Ratio soft key.
OK soft key
CT-Quick card:
Measurement Type:
CT Ratio
Figure 8-9
For the CT Ratio measurement type, the CT-Quick card holds the following
measurement quantities:
CT-Quick card and Results card for CT ratio measurement
Parameter Description
Output The output signal type is fixed to "AC".
U/I Operating mode of the internal signal generator: voltage or
current source. Fixed to "Voltage".
Amplitude RMS voltage of the output signal. Adjustable by the user.
Possible values: 0 to 40V. Default: 1.00V.
f Frequency of the output signal. Adjustable by the user.
Possible values: 5.0 to 400.0Hz or soft keys 16.7Hz, 50Hz,
60Hz or 400Hz.
Default: 50Hz
Load Fixed to "On".
Setting the Load parameter to "on" and specifying the winding
resistance and the unsaturated inductance in the fields R and L
will prevent saturation of the connected CT.
The output generator of the CT Analyzer then keeps the DC part
of the output current at zero using a current regulator
permanently running during the output of AC signals.
Using the Quick Test Feature
cursor key to move the
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