OMICRON 139
Using the guesser function
9.1 About the guesser function
The guesser function of CT Analyzer is intended as an aid for the user to find out single unknown name
plate data of a CT, 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
prim
, I
sec
, class or ratio.
Parameters that are guessed by 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 CT Analyzer, select the ? soft key
instead of specifying a value for this parameter. During the test, CT Analyzer replaces the question mark
by the value guessed.
When using this function, please be aware that assessments performed with one or more
guessed parameters may possibly differ from an assessment based on exact name plate data.
Absolutely reliable assessment is only guaranteed if all necessary CT data are specified prior to
the test.
The guesser function cannot release the user from specifying the CT’s name plate data prior to testing.
Always specify as many CT data as possible to increase the reliability of the values guessed by
CT Analyzer.
It is possible to configure the guesser function of CT Analyzer in a way that it checks whether the user
has entered all necessary values and data relevant for an automatic assessment prior to the test start.
The respective parameters are then marked by a star ("*") in the CT-Object card. If the user did not enter
data for one or more of these parameters, no automatic assessment is performed and CT Analyzer
displays an "Assessment not available" message after the test is finished.
This option can be used to avoid an automatic assessment if important parameters were guessed by
CT Analyzer and not entered by the user. This behavior can be selected using the "Check "*" settings
before start" option in the default test settings (see section 6.8.3 "Miscellaneous settings" on page 71).
This settings page also provides an option to enable the display of a corresponding message prior to the
test start.
Note: The guesser function is not available if you use a customized assessment configuration instead
of a standard (see "Select Customized Assessment" on page 68).
9.2 Setting up and connecting CT Analyzer
1. Set up CT Analyzer as described in section 3.2 on page 25.
2. Connect the CT to CT Analyzer as described in chapter 3.
► Refer to section 3.4.1 on page 27 for detailed information on how to connect CT Analyzer for the
CT test.
► Be sure that the polarity of all wires is correct.
Note:
The data and values determined by CT Analyzer using the guesser function are not guaranteed and
have to be verified by the user.
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