Increasing Efficiency by Applying a New Generation Dual-Core Transformer Design

Abstract

In this study, in order to reduce the core losses of power transformers, the case of using two cores that can be activated according to the need instead of a single core is discussed. As it is known, in power transformers, the tolerance of core losses in the case of drawing the nominal power from the secondary depends on the materials used. In particular, the flux loss of the soft, siliceous sheet forming the core is tried to be improved by the manufacturing companies. However, if a small amount of the nominal power is drawn from this transformer while using a single core, core losses can be even greater than the power drawn. In the project of this study, a transformer with two different cores will be produced by dividing the core that will provide the total nominal power while manufacturing the transformer instead of a single core. Theoretical studies and simulation results show that this is possible. In the scientific literature, this situation is examined as a parallel study. It is known that transformers that show high variability in the amount of loading throughout the year in the national grid operate at a low occupancy rate. Instead of the single active core, the increase in the occupancy rate will make the second core active and meet the demand by working in parallel with the cores, which will contribute to the country's economy. Here, the switching on and off of the two cores placed in the same tank will be adapted considering the operating range of the cores with the highest efficiency by selecting the true direction of windings. Transformer prototypes to be produced within the scope of the new generation dual-core transformer project will be selected from among transformers with unbalanced load profiles in YEDAŞ responsibility areas, and transformers with a power of 2x50 kVA will be installed to be applied in pilot areas.