Omicron CT SB2 User Manual page 103

Table 8-8: Parameters and settings for IEC 61869-2 protection CTs (continued)
Param. Description
Kssc Rated symmetrical short-circuit current factor.
Possible values: 1 to 300 or soft keys ?
10, 12.5, 15, 17.5, 20, 25, 30, 40 or 50.
Default: ?.
Spec. The accuracy class assessment has to be
performed for the specific protection requirements
the CT is built for. According to the standard, these
requirements are normally stated by the duty cycle
and the time constants.
However, in some cases the choice of one specific
duty cycle/time constant cannot describe all
protection requirements. Therefore, CT Analyzer
offers the possibility to specify "more general
requirements" (which cover the requirements of
different duty cycles and time constants) by
entering the K
Use the soft keys to choose if you want to specify
the protection requirements used for the accuracy
class assessment
► by specifying the duty cycle and the necessary
time constants (by Duty, standard specification
according to IEC 61869-2; CT Analyzer then
calculates the K
entered values)
► or alternatively by specifying the rated transient
dimensioning factor K
name plate (by Ktd, alternative specification
according to IEC 61869-2).
The setting of this parameter displays or hides the
parameters K
parameter descriptions below).
Possible values: Soft keys by Duty or by Ktd.
Default: As defined in the default test settings.
OMICRON
instead.
td
automatically from the
td
stated on the CT's
td
, and T , Duty and t
td p al1
Test cards for Advanced CT Test mode
Available for IEC 61869-2 protection
CTs, class
protection
...P ...PR PX
1
, 3, 5, 7.5,
(see
transient
protection
PXR TPX TPY TPZ
x x x
x x x
101