Omicron Lab CT Analyzer User Manual page 131

Param. Description
Class Accuracy class according to standard.
Δϕ
Phase deviation.
ε
Current ratio error.
FS Instrument security factor (direct measurement
method).
FSi Instrument security factor (indirect meas. method).
Parameters assessed for IEEE C57.13
Parameter Description
Class Accuracy class according to
standard.
Rct DC winding resistance.
Δϕ
Phase deviation.
RCF Ratio correction factor.
ε
Current ratio error at secondary
@ Isn
current I .
sn
ε
@ 20 * Isn Current ratio error at 20 times the
secondary current I
Vb Rated secondary terminal voltage.
Vknee Knee point voltage.
Vk / Ik User-defined measuring point.
Vk1 / Ik1 User-defined measuring point 1.
1. Acc. to IEEE C57.13 (1993)
The CT Analyzer Test Cards
Parameter assessed for
IEEE C57.13
protection CTs,
class
C T
x x
x x
x x
.
sn
x x
x
x
Parameter assessed
for IEC 61869-2
metering CTs
0.1, 0.2, 0.2s,
0.5, 0.5s, 1 3, 5
x x
x
x x
x x
x x
IEEE
C57.13.6
meter. high
CTs accuracy
metering
CTs
0.15,
0.3, 0.6,
1
0.15s
X K 1.2
x x x x
x
x x
x x
x x
x x
x
x
x
x
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