An oil-immersed power transformer is an electrical device used to step up or step down voltage levels in power systems. It contains mineral or synthetic oil that serves two main purposes: electrical insulation and cooling. The oil provides insulation between live components and helps dissipate the heat generated during operation.

Oil-immersed power transformers play a critical role in high- and medium-voltage transmission and distribution networks. They are commonly used in substations, industrial facilities, and power generation plants where large amounts of electrical energy must be transmitted safely and efficiently.

• High capacity: Capable of transmitting and distributing large amounts of power safely.

• Insulation and cooling: The oil ensures both electrical insulation and effective heat dissipation.

• Long service life: With regular maintenance and oil monitoring, these transformers can operate reliably for many years.

• Various voltage levels: Designed for both medium voltage (1–36 kV) and high voltage (above 36 kV) applications.

• When alternating current is applied to the primary winding, it creates a magnetic field that transfers energy through the transformer’s magnetic core to the secondary winding.

• This process steps the voltage up or down depending on the winding configuration.

• The transformer oil absorbs the heat generated by the windings and core, then releases it through radiators or cooling fins to the surrounding environment.

• Can transmit and distribute high power efficiently.

• Provide high energy efficiency in transmission systems.

• Robust design ensures long operational life.

• Oil ensures safe operation and effective heat management.

• The presence of oil introduces a fire risk, requiring special fire protection measures.

• Regular maintenance and oil testing are necessary to ensure reliable operation.

• Large size and weight make transportation and installation more difficult.