CT Analyzer User Manual
94 OMICRON
VA *
Cos
ϕ
Nominal burden of the CT, used to calculate the behavior of the CT with the nominal
burden.
Possible values: 0 to 400VA or soft keys 1.0VA to 30VA or ?
1
.
Depending on the burden and the selected test standard, the corresponding cos ϕ is used
(cos ϕ not editable by the user).
* This parameter is relevant for assessment. No automatic assessment is available if the
user did not enter data for this parameter prior to the test.
If the IEEE C57.13 standard is selected with the type "protection CT" (class C, K or T)
, the
VA and Cos
ϕ parameters are not accessible to the user. In this case, the user has to enter
the terminal voltage V
b
instead. See "Specific parameters and settings displayed for
IEEE C57.13 protection CTs" on page 105.
Burden
Cos
ϕ
"Burden" and "Cos ϕ" are used to define the operating burden connected to the CT. These
parameters are used to calculate the behavior of the CT at the operating burden
(connected burden) and the corresponding cos
ϕ.
Possible values for "Burden": 0 to 400VA or soft keys 1.0VA to 30VA or ?
1
.
Possible values for "Cos
ϕ": 0 to 1.
These parameters can also be changed after the test or in a loaded test report in order to
check the CT behavior at different burden values.
If the IEEE C57.13 standard is selected with the type "metering CT"
, CT Analyzer offers
soft keys with standard loads for the power (for example, E-0.1, B-0.1, B-0.2, etc.). If these
soft keys are used, the power is calculated according to table 9 of IEEE C57.13. If the rated
current is not 5A, the resistance and inductance of the table is multiplied by the factor
f Rated frequency of the CT.
Possible values: Integer value between 16 and 400 Hz or soft keys 16.7Hz, 50Hz, 60Hz or
400Hz.
Default: Frequency defined in the default test settings.
Rprim Specified primary winding resistance (only available if primary winding resistance
measurement is enabled for the test).
Possible values: 0 to 3000 ohms or soft key ?
1
.
Default: ?.
Class mult.
factor
Class multiplying factor.
This factor increases the assessment level for the ratio test. E.g. 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 or soft key 1.0.
Default: As defined in the default test settings (Main menu -> Settings -> Misc. Settings).
Table 8-4: Parameters and settings common for all standards, CT types and classes (continued)
Parameter Description
α
5
I
rated
------------
2
=
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