Polarity of 3p core transformer

AI Thread Summary
A 380V, 3-phase core type transformer is utilized as an AC line choke in a VFD setup, focusing on its inductance properties. It is confirmed that the R phase can connect to any winding, provided the phase sequence is maintained. Ensuring consistency among the three windings is crucial, with no end-to-end swaps. For balanced phase currents, the shared core must exhibit a sum zero magnetic field. Proper connections will optimize the transformer's performance in this application.
Amith Menon
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I have a 380V,3 phase core type transformer which is being used as AC line choke in the incomer of a VFD.As we are using only the inductance property of the transformer,I was just wondering whether we could connect R phase of the supply to any winding and then follow the phase sequence accordingly.
Thanks in advance
 
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Yes. The only important thing is to make sure that the three windings are consistent and that one is not swapped end for end. For balanced phase currents, the shared core should have a sum zero field.
 

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