In the thesis new procedures of designing of cable connections, so called leads, inside transformer are described. Cables with cross section between 35 mm2 and 300 mm2 connect the windings with the bushings and tap changer or voltage reconnection plate, if present. In order to improve the automization of 3D models and speed up the design and production process, it was decided to renew the design principle. Between two types od wooden support system, the more suitable was selected. With the use of Creo program package, the standard type of wood support elements and templates for fastening assemmbly of those elements were modeled. The impact of pressboard barriers in the transformator were analyzed as well. Pressboard barriers are used to improve the dielectric strength of oil-barrier insulation system and therefore enable the reduction of insulation distances. In the production line, the effectiveness of new design principle and corresponding time savings were analysed.
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