... ,Three-phase Dry-type Power Transformer,Transformer,SG,DG DG and SG series Dry type transformerGeneralDG and SG series single-phase and three-phase dry ... ,station,wharf,enterprise,tunnel,etc.It is mainly used in power supply occasions of AC 50-60HZ and voltage less than 500V ... , station, wharf, enterprise, tunnel, etc. It is mainly used in power supply occasions of AC 50~60Hz and voltage less than 500V ...