DG and SG series single-phase and three-phase dry type transformer adopts high quality material and advanced technology,it has advantages of damp-proof and convenient maintenance,it can be applied to such power transmission and distributionplaces like underground railway,high building,airport,station,wharf,enterprise,tunnel,etc.It is mainly used in power supply occasions of AC 50-60HZ and voltage less than 500V.All the input and output voltage,connection group and capacity of tapped winding can be designed and produced according to users'requirements.