OMICRON 41
CT Analyzer test cards for MR Test mode
The following table lists the excitation results displayed in the MR-Results card.
Table 8-5: Ratio results displayed in the MR-Results card
Column Description
Ipn : Isec (A) This column shows for each tap combination the measured current ratio I
pn
/ I
sec
.
N This column shows for each tap combination the measured winding ratio.
Rat. (%) This column shows for each tap combination the measured ratio error in %.
Pol. (’)
Pol. (°)
This column shows for each tap combination the measured phase error (polarity) in
minutes or degrees. Switch the unit using the Pol. in Degrees or Pol. in Min. soft
key.
Table 8-6: Excitation results displayed in the MR-Results card
Column Description
Rct (mΩ) Secondary winding resistance.
Vkn (V) Knee point voltage.
Ikn (mA) Knee point current.
Vb (V)
TCF
ALF
FS
Kssc
The result displayed in this column depends on the standard selected in the
CT-Object card and the type of CT.
V
b
(IEEE C57.13, protection CTs only): Rated secondary terminal voltage for
protection CTs.
TCF (IEEE C57.13, metering CTs only): Transformer correction factor for metering
CTs.
ALF (IEC 60044-1, protection CTs only): Accuracy limiting factor for protection CTs.
FS (IEC 60044-1, metering CTs only): Instrument security factor for metering CTs.
K
ssc
(IEC 60044-6 only): Rated symmetrical short-circuit current factor.
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