@thesis{thesis, author={Ariadi Mohammad Aswin and Tambunan Juara Mangapul}, title ={ANALISA KINERJA UNIT AUXILIARY TRANSFORMATOR TENAGA 11,5/6,6 KV PADA UNIT LAYANAN PLTGU TANJUNG BATU KALIMANTAN TIMUR}, year={2022}, url={http://156.67.221.169/4856/}, abstract={The increasing demand for electricity in the current era requires good electricity distribution. One of the components that must be maintained in the distribution of electrical energy is a transformer. Transformers are useful in order to carry out the transformation of power (current and voltage) from the AC system to other current and voltage systems with the same frequency. This transformer makes use of the electromagnetic principle. UAT (Unit Auxiliary Transformer) functions as a step down transformer that supplies power to the Atomizing Air Compressor and SFC (Static Frequency Converter). Atomizing Air Compressor and SFC are auxiliary equipment used to assist the process of starting the initial rotation for the turbine so that it can operate. Efficiency is the ratio between the power that comes out of the transformer (Pout) and the power that enters the transformer (Pin). This indicates that at 05.00 the transformer load is large because the existing losses are large. In other words, the auxiliary equipment charged to the UAT is working. The efficiency value becomes small because the Is is small. Meanwhile, at 14.00, the efficiency becomes large because there is not much load received by the UAT, which means that the losses are small and the transformer works in ideal conditions. So, the efficiency value becomes large because the Is is large.} }