OMICRON 129
Test cards for Advanced CT Test mode
8.7.5 Ratio table and phase table for IEEE C57.13
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 IEEE C57.13, these tables show the ratio error and the phase displacement
• for different current values between 1% and 200% of the rated current.
• at the burden specified in the CT-Object card and all burden values defined in the IEEE C57.13
standard that are smaller than the specified burden.
If the Assess @ VA option has been selected for the "Class" parameter of an IEEE C57.13 metering
CT in the CT-Object card, the tables only show the ratio error and the phase displacement for the
burden value or burden range specified in the CT-Object card.
Use the Results with Op. Burden or Results with Nom. Burden soft key to display the results related
to the operating burden or related to the nominal burden.
Note: If a high accuracy license is available for IEEE C57.13, metering burdens also include the
electronic burdens.
The ratio table and the phase table contain all measurement points defined in the IEEE C57.13
standard.
Use the and cursor keys to scroll through the table columns (1% of rated current to
200% of rated current) and table lines (burden values).
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.
Figure 8-18: Displaying the ratio table and the phase table in the Ratio card (for IEEE C57.13)
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