Which applications favor oil filled transformer vs dry type designs?

Oil filled transformers are favored for outdoor substations, transmission networks, power plants, and high MVA industrial loads. Dry type designs are preferred in hospitals, commercial buildings, tunnels, and indoor installations where fire safety and oil spill concerns dominate. Voltage level, power rating, space constraints, environmental risk, and maintenance policy determine selection. For high voltage and bulk power transfer, oil filled transformers remain the dominant solution.