Omicron Lab CT Analyzer User Manual page 74

CT Analyzer User Manual
72
Class multiplication
factor
Decision 1A/5A CT
Decision P/M CT
The Reset Values soft key resets all values to their default values.
The default value for the class multiplying factor can
be set. This default is used when the 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
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