There are many kinds of furnace transformer, though each furnace transformer has different usage,different voltage regulation and different voltage class Reducing transformer's loss,strengthening dynamic and thermal machical stabilty,improving the ability to with stand short circuit have been mainly considered during design Oil immersed type and dry type transformer can be supplied according the requirements of customer。 DC used in industry is gained mostly form rectifier equipment,rectifier Transformer composed by rectifier throughout A Cpower system,rectifier transformer is used as a electrical source of rectifier Due to its specificity,similarity and difference between power transformer and rectifier transformer have been consided during design We have developed Iow loss type rectifier transformer with lower application cost