Omicron Lab CT Analyzer - Page 129

127
The CT Analyzer Test Cards
Parameters assessed for IEC 60044-6
Parameter Description Parameter assessed for
IEC 60044-6
TPS TPX TPY TPZ
Class Accuracy class according to standard. x x x x
Rct DC winding resistance. x x x x
Δϕ Phase deviation. x x x
ε Current ratio error. x x x
εt Turns ratio error (included in class). x
^
ε
Peak instantaneous error at voltage E
max
.
xx
Tp Primary time constant. x x x x
Ts Secondary time constant. x x
Kr Remanence factor. x
Ktd * Kssc Transient dimensioning factor (K
td
) multiplied by
the rated symmetrical short-circuit current factor
(K
ssc
).
xxx
K * Kssc Dimensioning factor (K) multiplied by the rated
symmetrical short-circuit current factor (K
ssc
).
x
V-al Rated equivalent excitation limiting secondary
voltage.
x
I-al Accuracy limiting secondary excitation current. x