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The key advantage of AC and three-phase technology over DC is its ability to generate electrical power efficiently in large power stations located far from end users. Power is then transported at high voltage over long distances with minimal loss and delivered to consumers as needed, thanks to the use of transformers. In this laboratory, a three-winding transformer is studied, featuring different connection options on the primary side and a variable secondary voltage. The tertiary winding serves as a delta stabilizing winding for asymmetrical loads. Overhead power lines are used for energy transmission, while cables are used in densely populated areas. Additionally, components such as busbars, disconnectors, circuit breakers, and voltage/current transformers are examined, which are crucial in switching stations.