Which type of transformer is primarily used to change voltage levels in substations?

The power transformer is primarily used to change voltage levels in substations due to its ability to handle high voltage and high power capacities efficiently. Substations play a crucial role in the electrical power distribution network, often transferring electricity over long distances and managing voltage levels between generation and distribution.

Power transformers are specifically designed for stepping up or stepping down voltage levels to accommodate the needs of different parts of the grid. They are built to operate continuously in the transmission and distribution of electrical energy and are equipped to handle significant energy loads. Their construction ensures minimal energy loss during the voltage transformation process, which is essential for maintaining system efficiency.

Current transformers and voltage transformers serve different purposes. Current transformers are primarily used for measuring current and protecting equipment, while voltage transformers are designed to reduce voltage levels to safe levels for metering and relaying purposes, not necessarily for high capacity voltage transformations within substations. Isolation transformers, on the other hand, provide electrical isolation between circuits, rather than being focused on changing voltage levels.