Power electronics as the controllers of speed are used for the velocity control of motors in the petroleum operations.
Because the extraction pumps are at extreme depths is required that this equipment is fed by an electrical system of median tension.
The transformer, connected to systems that speed controllers use, are exposed to a train of pulses with a front tension (dv/dt) extremely high and with frequency of repetition also relatively high, which increases the efforts in the dielectric of the windings, as much of the primary winding, that in the present case is of low tension, like in the secondary winding which is of median tension.
With the geometric data and of construction of a typical transformer with practical applications of this type, a geometric model of symmetry-axial is realized considering tank, nucleus, windings and the dielectric means that constitute it; in order that in one first stage of the present work the required calculation of the equations of Maxwell takes place using the Finite Element Method(FEM); thus to obtain the necessary results the electrical parameters also considering a frequency equivalent to the time of elevation of the applied wave front.
On the other hand it is possible to indicate that this modeling requires great computer resources like a high capacity in memory (RAM), as well as a processor of double nucleus; since one forms enmeshes in the region of solution of 709680 elements which means that they are solving a same number of equations.

As one second stage obtains a model in distributed parameters of the windings of the transformer, designed specifically to respond to high frequencies. In this model the data of the obtained electrical parameters by means of the FEM are introduced previously and the simulation of this model takes place using EMTDC/PSCAD software. Like the first approach, using this one circuital model, connects in primary a source step, later to connect the sources of one tension PWM and two levels and thus to obtain the answers in the secondary one, as much in the time domine like in the space. Of these results they will be possible to be compare the answers obtained in the secondary one to different excitation, as well as to study the gradient of electrical potential in the same winding, and possibly to obtain the conclusions that give rise to some types of solution to the problem.