Why D.C. Supply is not given to the Transformer?

Why D.C. Supply is not given to the Transformer?

1. When you connect a DC source with a transformer, obviously for the primary winding, the flux inside the coil will be constant because the flux is induced due to constant current flux.
2. EMF induced will be zero due to constant flux which is produced by d.c supply
3. Now the primary winding will behave like a short circuit because no emf is induced, which opposes the supply voltage and will allow heavy current to pass through it and will immediately burn the insulation and then it will burn the winding.
4. As the DC supply has zero frequency, and flux density is proportional to the frequency, the flux density will move towards infinity and hence it saturates the transformer core.
5. Also, the  transformer has an inductive winding and If the DC supply is given to the transformer than the Primary of the transformer gets damaged the reason is 

          I=V/Z;

         Z=R+jXL

         XL=2*pi*f*L

         if f=0 (In the case of DC)

         XL=0

         Z = R

         I= V/R

       Which allow heavy current to flow through it which immediately burn the insulation and then burn the winding.