The goal of this diploma thesis was to prepare a project for the reconstruction of a transformer substation, in which the replacement of the existing equipment with modern, more reliable, and energy-efficient components is foreseen. The reasons for replacing the transformer and associated switchgear are presented, as well as the key aspects that need to be considered when designing such facilities.
The transformer substation consists of three main parts: a medium-voltage (MV) switchgear, a low-voltage (LV) switchgear, and the transformer itself. The thesis describes the characteristics of the existing condition and outlines the design of the new solution, which includes the selection of suitable equipment, protective devices, and cable connections. Special attention is given to transformer protection, equipment dimensioning, and the economic and environmental evaluation of the investment.
The results confirm that modern equipment ensures greater reliability, safety, and efficiency in the operation of the distribution network. The reconstruction also brings important environmental benefits, such as the elimination of SF₆ gas technology, the use of environmentally friendly insulating media, and a transformer with reduced energy losses.
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