CT Analyzer User Manual
128 OMICRON
8.7.4 Ratio table and phase table for IEC 60044-1, IEC 60044-6 and
IEC 61869-2
To display the ratio table or the phase table, press the Ratio Table or Phase Table soft key in the Ratio
card.
If the selected standard is IEC 60044-1, IEC 60044-6 or IEC 61869-2, these tables show the ratio error
and the phase displacement
• for different current values between 1% and 200% of the rated current, and
• at 100%, 50%, 25% and 12.5% of the operating burden defined in the CT-Object card ("Burden"
parameter), and
• at 100%, 50%, 25% and 12.5% of the nominal burden defined in the CT-Object card ("VA"
parameter) or at 1VA if one of these percentages results in a nominal burden smaller than 1VA.
Use the Results with Op. Burden or Results with Nom. Burden soft key to display the results related
to the operating burden ("Burden" parameter in the CT-Object card) or related to the nominal burden
("VA" parameter in the CT-Object card).
The ratio table and the phase table contain all measurement points defined in the standards
IEC 60044-1, IEC 60044-6 and IEC 61869-2.
Use the cursor keys to scroll through the table columns (1% of rated current to 200% of rated
current).
Figure 8-17: Displaying the ratio table and the phase table in the Ratio card (for IEC 60044-1,
IEC 60044-6 and IEC 61869-2)
Note: Values that caused a failed assessment are highlighted by black background in the tables. Values
without the prefix "!" have guaranteed accuracy. The accuracy of values marked with a "!" in the tables
is reduced by factor 2.
Note: For IEC 60044-1 metering CTs with I
sn
= 5A, it is possible to increase the minimum nominal
burden used for the assessment to 3.75VA in the device settings (Main menu -> Settings -> Rated
Burden Constraints -> "Min. VA at M cores Isn 5A" parameter). In this case, the lowest nominal burden
value displayed in the ratio table and the phase table is 3.75VA instead of 1VA. Please note that this
only applies if the results are displayed with the nominal burden. It has no effect if the results in the ratio
table and the phase table are displayed with the operating burden.
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