what happen if we provide dc supply to transformer. and why.??

While applying DC voltage to the transformer,there is no induced EMF in the primary &
secondary wdg.(except during switching period, both ON& OFF).so,the transformer will draw high current from the supply which detoriate the winding insulation & cause transformer to burn.But actually this will not happen .Becoz,the fuse will sacrifice itself to protect  transformer from high current.