OMICRON 155
Using the Quick Test feature
10.6 CT ratio measurement
CT ratio measurement is a predefined measurement type, intended especially for
the quick measurement of CT ratios.
Note: This is not a complete CT test. It only determines the current ratio of CTs.
To select the CT Ratio measurement type, use the cursor key to move the
cursor to the Measurement Type field in the CT-Quick card and then press the
CT Ratio soft key.
Figure 10-9: CT-Quick card and Results card for CT ratio measurement
For the CT Ratio measurement type, the CT-Quick card holds the following measurement quantities:
Table 10-7: Parameters for CT Ratio measurement type
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 CT Analyzer then keeps the DC part of the output current at
zero using a current regulator.
R, L Winding resistance (R) and unsaturated inductance (L) of the CT, used by the internal
output regulator to prevent saturation of the connected CT (see Load above).
Possible values: 0 to 1000
Ω or 0 to 1000H.
Default: 1.00
Ω for R and 50.00H for L
If these values are not set correctly for the connected CT, the CT will saturate sooner or
later, depending on the inaccuracy of the values used.
Press the Main soft key in
any test card
Main Menu:
- New Quick-Test
OK soft key
CT-Quick card:
Measurement Type:
CT Ratio
How to get there:
To Next Page
Loading...
Need help?
General
