Omicron Lab CT Analyzer User Manual page 38

CT Analyzer User Manual
If it is possible to short-circuit the transformer winding at the same leg as the
primary measurement is done (see Figure 2-15), the measurement should be
performed with the winding short-circuited. In this case, no delta compensation
is required since the voltage induced on the transformer's secondary winding is
zero and thus the voltage induced on the primary side of the transformer is also
zero.
For the measurement setup shown in Figure 2-14, the delta compensation factor
on the CT-Object card has to be set to "Ratio 2/3" (see Figure 2-13).
If input "Prim" is connected between L1 and L2, the delta compensation has to
be set to "Ratio 1/3".
L1
L2
L3
Figure 2-14 Measurement setup for delta compensation "Ratio 2/3"
In the configuration shown in Figure 2-15, no delta compensation is required
since the main winding of the power transformer is short-circuited on the other
side. This avoids the induction of flux in the main winding of the power
transformer that could influence the measurement results.
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