3D FINITE-ELEMENT COMPUTATION OF THE HIGH-FREQUENCY PARAMETERS OF POWER TRANSFORMER WINDINGS

In this paper, we present a computation of power transformer parameters with a numerical method using finite elements. The modeling, based on the calculation of the 3D electromagnetic field, allows for a new approach to the study of the high frequency phenomena. that propagate along the transformer windings. These parameters include the inductive and capacitive parts of a discretized winding. The energy method is used for finding the inductive parameters. The capacitive matrix is obtained using a method based on the computation of the charge on each disk winding. These methods are very efficient compared with the use of analytical and 2D numerical techniques. They allow the exact computation of the discretized winding parameters for any complex 3D geometry. This paper intends to contribute in this direction. Examples of calculated parameters are given for illustration. The final objective is to establish a computational model to study the propagation of steep front surges along transformer windings.