The pole-mounted single-phase oil-immersed transformer is a crucial electrical device. It has a cylindrical shape and is designed for single-phase operation. This transformer is installed on poles and is immersed in insulating oil, which serves as both a cooling agent and an insulator.

The core of the transformer is made up of laminated silicon steel sheets with excellent magnetic conductivity. The windings, consisting of copper or aluminum wires, are wound in multiple layers around the core. The low-voltage winding is typically located inside while the high-voltage winding is on the outside.

The oil-filled tank acts as the enclosure, protecting the internal components and providing a medium for heat dissipation. It also contains accessories such as the oil conservator, which compensates for the expansion and contraction of the oil. The gas relay is installed to detect faults and trigger appropriate protective actions. Insulating bushings are provided to ensure electrical insulation between the windings and the external connections.

This type of transformer is widely used in power distribution systems due to its compact size, reliable performance, and ability to handle a certain level of load. It plays a vital role in converting high-voltage power to low-voltage power for residential, commercial, and industrial consumers.