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The purpose of this study is to analyze the performance and effectiveness of the Energize 400kVA Transformer model which acts as a step-up transformer in the electric power distribution system. The focus of this study is to evaluate the efficiency of the transformer in increasing the voltage from medium to higher levels and the impact of this conversion on power stability, energy losses, and thermal resistance.Testing was carried out by operating the transformer at various load levels and measuring performance parameters such as copper and iron losses, voltage regulation, and cooling capacity. The results showed that the Energize Transformer 400kVA can operate optimally as a step-up transformer with high efficiency in the load range of 70-90% of full capacity and good voltage stability when the load changes. The transformer cooling system also proved effective in maintaining the operating temperature within safe limits, thus contributing to a longer service life and shorter maintenance intervals. Based on these results, the Energize Transformer 400 kVA model is suitable for use as a step-up transformer in medium to large distribution networks, supporting optimal power quality and high operational efficiency.