OMICRON 29
Setup and connection
3.4.2 Wiring for a burden test
Applicable for Advanced CT Test mode only.
For a burden test, connect CT Analyzer as shown in Figure 3-3. Observe the general safety rules in
section 3.1 on page 23 and the safety instructions given in chapter 1 "Safety instructions" on page 9.
1. Open the connection line to the ungrounded side of the CT (refer to Figure 3-3).
2. Connect the black OUTPUT socket and the black socket of CT Analyzer input SEC to that side of
the burden that is connected to PE.
3. Connect the red OUTPUT socket and the red socket of CT Analyzer input SEC of to the other
(ungrounded) side of the burden.
Figure 3-3: Basic wiring for a burden test
NOTICE
Falsification of measurement results possible
It is important to disconnect the CT under test prior to the burden test.
► If you do not disconnect the CT for the burden test, CT Analyzer measures the parallel
impedance of the burden and the CT winding instead of the burden itself. Although in many
cases the impedance of the CT is many times higher than the burden impedance, this will cause
a measuring error.
► CT Analyzer does not perform demagnetization after burden measurement. Therefore, CT
saturation could occur if you do not disconnect the CT prior to the burden test.
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