Dry-type transformers use air as a cooling medium while oil-filled transformers use oil as a cooling medium. Oil-immersed transformers are low in cost, easy to maintain, but flammable and explosive.
Dry-type transformers are fire-resistant, clean, easy to install, but more expensive and larger.
Oil-cooled transformers have lower operating loss, higher energy efficiency, longer lifespan, and lower noise level than dry-type transformers.
Oil-cooled transformers are suitable for outdoor installations due to the risk of oil leaks and fire.
Dry-type transformers are ideal for indoor applications such as shopping malls and hospitals.