Current Transformer
4 - 11
CT Burden
Use the CTBurden test card to measure a current transformer’s secondary
burden with AC current injection into the load (up to 6A).
To do so, open the circuit as shown in Figure 7, and inject the AC current from
CPC 100 6A ACoutput into the burden.
The IAC input measures the current that flows into the burden, and the V1AC
input measures the voltage at the burden.
From these measurements, the burden (in VA) and the power factor cos
ϕ are
calculated.
This is the preferred method in cases when the current of max. 800A that
CPC 100 can feed into the CT’s primary side is not sufficient.
Figure 7:
Setup for a CT burden
measurement
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