Omicron Lab CT Analyzer, User Manual

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19
Measurement Setup
3 Measurement Setup
3.1 General
When connecting the CT to the CT SB2 , please also observe the wiring hints
given in the CT Analyzer User Manual.
Always connect only one CT to the CT SB2 . Disconnect and remove unused
cabling from the CT SB2 and the CT after testing.
Using the CT SB2 switch box, CT testing, burden measurement and primary
winding resistance measurement can be performed separately (i.e., using
separate test procedures) or together in one test sequence. Figure 3-2 and
Figure 3-3 show the basic wiring required for CT testing. To measure the burden
and the primary winding resistance together with the CT test, the additional
wiring shown in Figure 3-4 and Figure 3-5 is necessary.
The advantage of using the CT SB2 for single-ratio CT testing is the option to
include burden and/or primary winding resistance measurement to the test
without any need for wiring changes during the test procedure. If you do not want
to perform burden or primary winding resistance measurement, you should
preferably use the normal single-ratio CT test mode of the
CT Analyzer without
using the CT SB2 .
If you do not use the CT SB2 switch box for CT testing with the
CT Analyzer , disconnect all cabling to the CT SB2 from the CT Analyzer
(incl. the data connection cable connected to the remote control interface
of the
CT Analyzer ).
Warning: When measuring the ratio of transformers make sure that the test
voltage is connected to the corresponding secondary winding, and the primary
winding is connected to the according measurement input. Accidentally mixing
up the windings can cause life-threatening voltages within the transformer
and/or destroy the connected CT, the
CT SB2 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. Always connect all
secondary taps to the
CT SB2 switch box in order to guarantee safety during
testing.