Used and scrap transformer market, categorized by the condition of the scrap transformers, it can be divided into: transformers that can still be used, and scrapped transformers.

If classified by the application of used transformers, they can be divided into: power, instrument, testing, and special transformers.

Firstly, if categorized by the usage status of second-hand scrap transformers, they can be divided into: transformers that can continue to be used, and scrap transformers that are deemed obsolete.

Secondly, for the recycling of second-hand transformers that can still be used, it's generally possible to sell them to manufacturers or other companies, which would fetch a higher price. For transformers that are to be scrapped, the recycling valuation would be based on the copper wire, iron, and other components inside. Since they are typically recycled as scrap, the prices are usually lower. Generally speaking, the recycling price per ton for copper-core transformers is relatively lower, while that for aluminum-core transformers is relatively higher.

Transformers can be categorized by their applications, including power transformers, instrumentation transformers (such as voltage and current transformers), test transformers (capable of producing high voltage), and special transformers (like circuit transformers and rectifier transformers). The recycling of transformers of different applications is generally based on their usability and the transformer model.