Tap changers are key components in electrical transformers that play a crucial role in regulating voltage output. By adjusting the number of turns in the transformer's primary or secondary winding, tap changer in transformer can increase or decrease the voltage to maintain it within acceptable limits despite fluctuations in input voltage. This function is vital for ensuring a stable and reliable electricity supply in a variety of settings, including industries, residential areas, and commercial buildings. Tap changers can be operated manually or automatically, depending on the size and type of transformer. Their ability to adjust voltage levels makes them an essential part of electrical distribution systems, contributing to energy efficiency and protecting sensitive equipment from damage. Furthermore, tap changers help extend the lifespan of transformers by ensuring they operate within their designed voltage parameters, ultimately contributing to the overall reliability of the electrical grid.