Omicron CT SB2 User Manual page 74

CT Analyzer User Manual
Table 6-2: Miscellaneous Settings options (continued)
Option
Class multiplication factor The default value for the class multiplying factor can be set. This default is
LV CT Test Mode
Decision 1A/5A CT
Decision P/M CT
The Reset Values soft key resets all values to their default values.
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Description
used when CT Analyzer is switched on or if a new CT test is selected in
the main menu.
The class multiplying factor increases the assessment level for the ratio
test. For example, a class multiplier of 0.5 means that the maximum
accepted tolerance for the ratio error is only half the standard tolerance.
Possible values: 0.25 to 1.00. Default: 1.00
Use the soft keys to define the default measuring mode of CT Analyzer:
Toggle Mode: Normal measuring mode of CT Analyzer. Applies test
signals of different magnitudes and frequencies to the CT in order to
measure the excitation characteristic.
Sinus Mode: Applies sinusoidal test signals with rated frequency to the
CT in order to measure the excitation characteristic. The Sinus measuring
mode may be indicated for testing very small CTs with very low knee point
voltages.
If the guesser function is active, the device uses the measured winding
resistance to decide whether the CT is a 1A or 5A CT. This value specifies
the decision threshold.
Possible values: 0.5 to 2
If the measured winding resistance is higher than the defined value, the
guesser function decides that the CT's nominal secondary current is 1A.
Otherwise the secondary current is 5A.
If the guesser function is active, the device uses the measured knee point
voltage to decide whether the measured CT is a protection CT or a
metering CT. This value specifies the decision threshold.
If the knee point voltage is higher than the defined value, the guesser
function decides that the measured CT is a protection CT. Otherwise it is a
metering CT.
• "1A: Prot. CT, if V-kn >"
Possible values: 50 to 300V. Default: 100V.
• "5A: Prot. CT, if V-kn >"
Possible values: 15 to 60V. Default: 20V.
Ω. Ω.
Default: 1
OMICRON