Add choke the transformer

Calculation of the magnetic core added to the transformer to increase the reactive impedance.
Before using this program, it is necessary to have already performed the first calculation of a three-phase or single-phase transformer without choke.
Based on the main values of the first calculation such as turns, magnetic flux ,Core,reactive impedance proper etc., it is possible to calculate the
core to be inserted between the windings to reach the value of short circuit voltage required by the customer.