Dry-type transformers and oil-immersed transformers difference

In daily life, the common transformer is tantamount to dry-type transformers and oil-immersed transformers of the points, the two have their own characteristics, and the scope is very different, but both are superior performance, popular. From the literal point of view, dry-type transformers and oil-immersed transformer is the main difference is no "oil", as I do not know, because there is no oil, both in appearance there is a big difference.
Dry-type transformer without oil, do not shell, and can directly see the transformer coil, and 3 phase step up transformer because there is oil, there is a shell, the shell is transformer oil, oil soaked with transformer coil, from the outside Can not see the transformer coil.
Oil-immersed transformer in order to facilitate the heat, that is, to facilitate the flow of internal insulation oil cooling, the external design of the radiator, like a heat sink, and dry-type transformers but not the radiator, cooling transformer coil by the following fan, prefabricated compact transformer as a result of fire needs, generally installed in a separate transformer indoor or outdoor, and dry-type transformers must be installed indoors, under normal circumstances installed in the low-voltage distribution room, and low-voltage Power distribution cabinet installed side by side.
It can be said that the two have their own advantages and disadvantages, each with its own characteristics, no matter what kind of transformer has its scope of application, can be used within its scope to play the greatest value.