Electronics, Transformers, the products not only have all the advantages of H grade non-envelop dry-type transformer, but also the 3-phase magnetic circuit symmetry entirely, the 3-phase no-load current balance, no-load loss and no-load current are lower, small size and lighter weight as well as quieter, are warmly welcomed by more users. the products are widely applied in high buildings, shopping centers, airdromes, sub-way, stations ...