Abstract: This paper comprehensively analyzed the significance of the development of green transformer, and briefly introduced the advantages of the open threedimensional wound core dry-type transformer green manufactured by Guangdong Open Electric Co.,Ltd., such as three-phase balance, energy saving, material saving, etc., and the necessity of applying three-dimensional wound core transformer to green transformer, hoping to provide effective help for relevant personnel.

Key words: green transformer, open type, drytype transformer, application