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Running a CT Test (Detailed)
4 Running a CT Test (Detailed)
This chapter provides a detailed description how to run a CT test using the
CT Analyzer. Follow the sections 4.1 to 4.5 in the given order.
The example CT test described below does not use the guesser function, which
is 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. For detailed information
about the guesser function, please refer to chapter 7 on page 131.
When working with the CT Analyzer, always observe the safety rules given in
section 2.1 on page 21.
Note: The CT may make humming or buzzing noises of varying frequency
during the CT test. This is completely normal and does not indicate a defective
CT.
Warning: Do not touch the equipment under test or the measurement leads
while the red LED on the CT Analyzer is flashing. Never connect or disconnect
measurement leads while the red LED on the CT Analyzer is flashing.
As long as the red LED is flashing, the output is active and lethal voltages can
occur due to the high energy stored in external inductors.
Warning: Always make sure that the CT Analyzer output is connected to the
correct side of the current transformer according to the wiring instructions given
in sections 2.4 and 2.5. Accidentally mixing up the windings can cause life-
threatening voltages within the transformer and/or destroy the connected CT
or the CT Analyzer!
Warning: Feeding test voltage to a tap of a multi-ratio CT can cause life-
threatening voltages on other taps with higher ratios. Do not touch these taps!
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