Omicron CT Analyzer Getting Started page 8

Getting Started with CT Analyzer & CT SB2
2 Introduction
2.1 Designated use of the CT Analyzer
The CT Analyzer is intended to perform automatic testing and calibration of low leakage flux current
transformers (i.e., CTs with non-gapped cores) in laboratories as well as on-site in utilities. Testing of
CTs with gapped cores is also possible with restricted accuracy. The following tests can be performed
using the CT Analyzer:
• Burden measurement
• Residual magnetism measurement of CTs
• CT winding resistance measurement
• CT excitation characteristic measurement according to IEC 61869-2, IEC 60044-1, IEC 60044-6
(TPS, TPX, TPY, TPZ) and IEEE C57.13.
• CT ratio measurement with consideration of a connected burden
• CT phase and polarity measurement
• Determination of accuracy limiting factor, instrument security factor, secondary time constant,
symmetrical short-circuit current factor, transient dimensioning factor, remanence factor, knee point
voltage/current, class, saturated inductance and non-saturated inductance.
• Guessing of unknown CT parameters and automatic assessment based on these values (see section
2.2 below).
Using the Quick Test feature it is also possible to use the CT Analyzer as a versatile multimeter with
included power source, e.g. for:
• Quick and easy resistance measurement, e.g. for wiring checks on the secondary side of CTs.
• Quick voltage ratio checks for VTs.
• Measurement of burden values, e.g. to determine the new burden value after changes of the relay
equipment. This allows the re-calculation of the CT test results for the new burden value by the
CT Analyzer and thus makes it unnecessary to run an additional CT test in order to determine the
behavior of the CT with the new burden.
• Quick wiring checks using the CPOL polarity checker from OMICRON. Using the CPOL in
combination with the specific test signal provided by the CT Analyzer's Quick Test feature you can
check a series of test points (e.g., the burden wiring) for correct polarity.
The CT Analyzer is intended exclusively for the applications described above. Any other use is deemed
not to be according to the regulations. The manufacturer and the distributor are not liable for damage
resulting from improper usage. The user alone assumes all responsibility and risk.
2.2 "Guessing" of parameters
The CT Analyzer provides a so-called guesser function which is intended as an aid for the user to find
out single unknown nameplate data, for example if parts of the CT's name plate are unreadable. If
sufficient other name plate data of the CT are available and specified by the user, this function is often
able to reliably determine single missing CT data, for example I
Parameters that are guessed by the CT Analyzer are marked by a question mark in the user interface of
the CT-Object card prior to the test. To have a parameter guessed by the CT Analyzer, select the ? soft
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, I , class or ratio.
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OMICRON