CP TD1 Reference Manual V 1.44
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The transformer with the shorted LV winding (Figure 12-21 and 12-22), was
used for the leakage reactance frequency scan (Figure 12-25). The faulty phase
shows a totally different behavior. As already mentioned a part of the LV winding
current is flowing through the core. In this case the leakage reactance depends
on the frequency due to the skin effect.
Figure 12-25 Leakage reactance frequency scan