Omicron Lab CT Analyzer User Manual page 68

CT Analyzer User Manual
66
Default Standard Select the default I
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
acc. to IEC 60044-6: K
to the standard.
acc. to OMICRON: K
remanence.
acc. to GB 16847: K
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
values).
by Ktd: Protection requirements specification by the
rated transient dimensioning factor K
CT's name plate (alternative specification according to
IEC 61869-2).
Default Nominal Nominal frequency to be used for a new CT test:
Frequency 16.7Hz, 50Hz, 60Hz or 400Hz.
, standard, class and CT type (P/M)
sn
(transient dimensioning factor):
td
is calculated exactly according
td
calculation considers the CT
td
is calculated acc. to the Chinese
td
automatically from the entered
td
stated on the
td