Oil-immersed transformers are designed to transmit and transform electrical energy in medium-voltage and low-voltage systems. They use dielectric oil as a cooling and insulating medium, which optimizes heat dissipation and ensures reliable performance even under heavy loads.

They are notable for their robustness, efficiency, and durability, making them ideal for applications in electrical grids, substations, and industrial environments. Additionally, they offer extra protection against moisture and environmental contaminants, making them suitable for outdoor or underground installations.