CT Analyzer User Manual
66
Default Standard Select the default I
sn
, standard, class and CT type (P/M)
setting to be used for a new CT test using the soft keys.
"Isn": Select the default secondary current (1A or 5A, or
? if you want to use the guesser function by default).
"
Standard": Select IEC 61869-2, IEC 60044-1,
IEC 60044-6 or IEEE C57.13.
"
P/M": Select Prot. CT or Meter. CT (protection or
metering CT), or ? if you want to use the guesser
function by default.
"
Class": The classes available for selection depend on
the selected standard and CT type (P/M). Select a class
or ? if you want to use the guesser function by default.
"Ktd" (IEC 60044-6 only):
If IEC 60044-6 is selected for the standard, it is
furthermore possible to select the calculation method for
the K
td
(transient dimensioning factor):
acc. to IEC 60044-6: K
td
is calculated exactly according
to the standard.
acc. to OMICRON: K
td
calculation considers the CT
remanence.
acc. to GB 16847: K
td
is calculated acc. to the Chinese
standard GB16847.
"TPX/Y/Z Spec. Mtd."
(IEC 61869-2 protection CTs only):
For IEC 61869-2 protection CTs of the classes TPX, TPY
and TPY it is possible to select the default method for
specifying the protection requirements used for the
accuracy class assessment (refer to page 93 for more
information).
by Duty: Protection requirements specification by duty
cycle and the necessary time constants (standard
specification according to IEC 61869-2; the CT Analyzer
then calculates the K
td
automatically from the entered
values).
by Ktd: Protection requirements specification by the
rated transient dimensioning factor K
td
stated on the
CT’s name plate (alternative specification according to
IEC 61869-2).
Default Nominal
Frequency
Nominal frequency to be used for a new CT test:
16.7Hz, 50Hz, 60Hz or 400Hz.
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