Secondary Winding Resistance Measurement Details - Omicron CT SB2 User Manual

8.4.3

Secondary winding resistance measurement details

Press the Wdg. Res. Test soft key in the Test Results card to display the secondary winding resistance
measurement details for the tap combination selected as tap in use in the MR-Config. card prior to the
test.
Figure 8-5: Winding resistance measurement details
Table 8-9: Test results for secondary winding resistance measurement
Parameter Description
I-DC Current used for measurement. Selected automatically, cannot be changed by the
user.
If I
sn
If I
sn
Maximum value: 5 A.
V-DC Measured voltage.
R-meas Measured resistance at ambient temperature.
R-ref Reference resistance (temperature-compensated resistance, compensated to T
T-meas Winding temperature of the CT at the time of measurement.
Value used:
Ambient Temperature defined in the Settings (main menu).
If this temperature is not set correctly, the reference resistance value (R
reference temperature will not be calculated correctly.
T-ref Reference temperature, i.e, temperature the CT is specified for.
Value used:
Reference temperature defined in the Settings (main menu).
The winding resistance at reference temperature is calculated from the winding
resistance measured at ambient temperature (T
temperature.
OMICRON
is 0.2 A or higher, I is automatically set to I
DC
is lower than 0.2 A, I
DC
CT Analyzer test cards for MR Test mode
sn
is automatically set to 0.2 A.
meas
.
) at
ref
) and the specified reference
).
ref
43