Abstract: In view of the physical phenomena of water content in insulating materials and the physical process of water discharge in the process of transformer body treatment, scientific analysis and research are carried out, and the system principle and drying process of drying equipment are gradually improved. Therefore, a new pressure-swing vacuum drying technology, which is different from the traditional one, emerges at the historic moment and has been widely used. This paper introduces a new type of vacuum drying technology in detail.

Key words: transformer, pressure alternating method, drying, heating, vacuum pumping