By cooling into dry-type transformers and oil-immersed transformers.

The cooling methods are divided into dry transformer and oil transformer.

The transformer may divide into according to the use: The distribution transformer, the power transformer, all seal the transformer, the combined transformer, the dry transformer, the oil bath type transformer, the single phase transformer, the electric stove transformer, the rectification transform

Cooling divided into dry transformer and oil immersed transformers.

By cooling divided into dry-type transformers and oil-immersed transformers.