In utility distribution, a power transformer is typically a medium or high-voltage unit that steps voltage between primary and secondary feeders, substations, or large customers. It must meet utility standards for insulation, short-circuit withstand, losses, and reliability. These transformers form the backbone between transmission and distribution networks, often equipped with tap changers, protective relays, and monitoring systems to maintain voltage quality and support load growth while ensuring safe, efficient operation over long service lifetimes.