Auto-Transformers Explained: How They Work, Benefits and Applications
Auto-transformers are affordable and energy-efficient solutions to regulate voltage levels in modern power systems. The primary function of transformers is to adjust the voltage levels between two or more alternating-current (AC) circuits. They are made of two main parts: a core (made of laminated iron sheets) and a wire coil (usually two). An increase or decrease in voltage levels is achieved by altering the ratio of coils. In this guide, we explore the basics of auto-transformers. What is an Auto-Transformer? Unlike the conventional transformer, which has two sets of wire coils, the auto transformer has a core with a single coil acting as both primary and secondary windings. Therefore, it is also known as a single winding transformer. Using electromagnetic induction, the single winding transformer adjusts the voltage levels (steps up or steps down) using a portion of the winding as the primary and another portion of the same winding as the secondary in electrical applica...