| Autors: ATANASOV, V. C., Mechkov Emil. Title: Technical economic analysis concerning connection groups of distribution transformers in Bulgaria Keywords: transformer, connection group, short circuit, power quality, Abstract: In Bulgaria's electricity distribution system, there are over forty thousand power transformers in operation. Of interest are the vector groups of connection and the behavior of the transformer under highly asymmetric loads and emergency modes in low-voltage networks. Transformers with Dyn connection group are the most common in distribution networks in our country. Small gamma transformers with power up to 100 kVA are produced with Yzn connection, all other gamma transformers with power above 100 kVA are with Dyn connection. This division is made due to the fact that small gamma transformers often operate in modes with large asymmetry. The increase in loads and the inclusion of more and more non-linear loads in the networks require a change in the separation criteria. In this article, the behavior of transformers from the two main vector groups under the influence of asymmetric currents and short circuits in low-voltage networks is analyzed. A techno-economic analysis of the profitab References Issue
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