Omicron Lab CT Analyzer, User Manual

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93
The CT Analyzer Test Cards
Kssc Rated symmetrical short-circuit current factor.
Possible values: 1 to 300 or soft keys ?
1
, 3 , 5 ,
7.5 , 10 , 12.5 , 15 , 17.5 , 20 , 25 , 30 , 40 or 50 .
Default: ?.
x x x
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, the
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
td
instead.
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; the
CT Analyzer then
calculates the K
td
automatically from the
entered values)
• or alternatively by specifying the rated
transient dimensioning factor K
td
stated on
the CT’s name plate ( by Ktd , alternative
specification according to IEC 61869-2).
The setting of this parameter displays or hides
the parameters K
td
, and T
p
, Duty and t
al1
(see
parameter descriptions below).
Possible values: Soft keys
by Duty or by Ktd .
Default: As defined in the default test settings.
x x x
Param. Description Available for IEC 61869-2
protection CTs, class
protection transient
protection
x P x PR PX PXR TPX TPY TPZ