Omicron Lab CT Analyzer, User Manual

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The CT Analyzer Test Cards
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 , entry "Settings" -> Setting Menu , entry "Min. VA at M
cores Isn 5A"). 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.
6.7.5 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 ("VA" or "Burden" parameter)
and all burden values defined in the IEEE C57.13 standard that are smaller
than the specified burden.
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).
Note: 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
specified in the
CT-Object card.
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).