Omicron Lab CT Analyzer - Page 130

CT Analyzer User Manual
128
Parameters assessed for IEC 61869-2
Param. Description Parameter assessed for IEC 61869-2
protection CTs
standard classes OMICRON
extension
5P 10P 5PR 10PR PX PXR
2P, 3P,
4P, 6P
2PR, 3PR,
4PR, 6PR
Class Accuracy class according to
standard.
xx x x xx x x
Rct Secondary winding resistance. x x x x x
Δϕ Phase deviation. x x x x
ε Current ratio error. x x x x x x
ε
c
Composite error.
xx x x x x
εt Turns ratio error (incl. in class). x x
Kr Remanence factor x x x x
Ts Secondary time constant. x x x
ALF Accuracy limiting factor (direct
measurement method).
xx x x x x
ALFi Accuracy limiting factor (indirect
measurement method).
xx x x x x
Ek Rated knee point e.m.f. x x
Kx Dimensioning factor (according
to IEC 61869-2).
xx
Ie Accuracy limiting secondary
excitation current.
xx
Ie1 Max. allowed secondary
excitation current at E
1
.
xx
Param. Description Parameter assessed for
IEC 61869-2
transient protection CTs
TPX TPY TPZ
Class Accuracy class according to standard. x x x
Rct Secondary winding resistance. x x x
Δϕ Phase deviation. x x x
ε Current ratio error. x x x
Ktd * Kssc Transient dimensioning factor (K
td
) multiplied by the
rated symmetrical short-circuit current factor (K
ssc
).
xxx
^
ε
Peak instantaneous error at voltage E
max
.
xx
Ts Secondary time constant. x
Kr Remanence factor x