Table 4-4: Measurement input "Prim"
Characteristic
Voltage ranges
Accuracy
Insulation
4.4
Winding resistance measurement accuracy
Table 4-5: Winding resistance measurement accuracy
Characteristic
Resolution
Accuracy
4.5
Ratio and phase measurement accuracy
The values given in the following table are only valid under the following conditions:
•
All utility lines to the primary side of the CT are disconnected.
•
One terminal of the primary side of the CT is connected to PE.
•
The original measurement cables delivered by OMICRON for the CT Analyzer are used.
•
The CT under test is a CT with a non-gapped core.
•
The knee point voltage according to IEEE C57.13 is > 3V.
Under interfering conditions the device has reduced accuracy.
Values without the prefix "!" in the ratio table of the Ratio card have guaranteed accuracy. The accuracy
of values marked with a "!" in the table is reduced by factor 2 since these values are not directly
measured but calculated from the measured values instead.
Table 4-6: Ratio measurement accuracy for 1 A CTs at rated current
CT ratio
0.2 - 1
> 1 - 2000
> 2000 - 5000
> 5000 - 10000
1. Nominal burden of the CT.
OMICRON
Rating
0 - 0.03 / 0.3 / 3 / 30V
AC
0.1% (guaranteed)
Reinforced insulation (R) to all other circuits
Rating
Ω
1m
0.05% (typical)
Ω
0.1% + 1m
(guaranteed)
I
Rated power
sn
1
1.0 - 30VA
1
0 - 30VA
1
0 - 30VA
1
0 - 30VA
Technical data of the CT Analyzer
(auto ranging)
1
Typical accuracy
0.05%
0.02%
0.03%
0.05%
Guaranteed
accuracy
0.1%
0.05%
0.1%
0.2%
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