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Reply To: Transformer riddle no.3 – Power transformer with cubical core

#1167
Hamid

    Thank you very much for your good answers. Fortunately you can focus to problem. I can add to your good answers as following: In transformers winding it will be seen that any one coil, either primary or secondary, carries current so that the currents in opposite sides flow in opposite directions, and repulsion forces are thus set up between opposite sides so that the coil tends to expand radially outwards in just the same way as dose a revolving ring or other structure due to centrifugal force. The coil thus tends to assume a circular shape under the influence of short circuit stresses, and therefore it is obvious that a coil which is originally circular is fundamentally the best shape, and is one which is least liable to distortion under fault conditions ( similar to cylindrical or spherical pressurize vessels) . From this point of view the advantages of the circular core type of construction are obvious. Why? Why we can not have cubical core and cylindrical coil in a transformer? Are there any electrical reasons?