Omicron CT SB2 User Manual page 69

Table 6-1: Setting Menu options (continued)
Option
Default Standard
Default Nominal
Frequency
OMICRON
Description
Select the default I , standard, class and CT type (P/M) setting to be
sn
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, or CUSTOM to load a customized assessment rule file
(see "Select Customized Assessment" on page 68; the guesser function
is not available if you use a customized assessment configuration instead
of a standard).
"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
acc. to OMICRON: K
td
acc. to GB 16847: K
td
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 101
for more information).
by Duty: Protection requirements specification by duty cycle and the
necessary time constants (standard specification according to
IEC 61869-2; CT Analyzer then calculates the K
entered values).
by Ktd: Protection requirements specification by the rated transient
dimensioning factor K
td
specification according to IEC 61869-2).
Nominal frequency to be used for a new Advanced CT test: 16.7Hz,
50Hz, 60Hz or 400Hz.
Operating and configuring CT Analyzer
(transient dimensioning factor):
td
is calculated exactly according to the standard.
td
calculation considers the CT remanence.
is calculated acc. to the Chinese standard
stated on the CT's name plate (alternative
automatically from the
td
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