Round or flat electrolytic copper or aluminum conductors with resin or paper insulations are used in the distribution transformers windings as conduction material.

Homogeneous distribution of voltage impulses is obtained by means of applying special winding processto windings exposed to high temperatures and voltages, and increasing the thickness of layer at the coil inlet and outlet. Thus, abnormal stresses on the windings are prevented.

According to the designspecifications, the winding configuration could be disc winding or layer winding in power trans- formers. In order to facilitate the production of the layer windings and eliminate the gaps on the contact surfaces of windings,horizontally and vertically operating winding (and insulation) machines having press-like systems are used.