Low ac voltage should be changed into high AC voltage by using step up transformer to transmit electricity to a long distance.
When transformer is connected to dc supply, steady state current start flowing through the winding. in case of dc supply self inductance is zero hence large current flows through the primary winding which results transformer get damaged.The short answer is that yes, you can use a transformer "backwards". Actually the transformer has no way to tell what direction power is flowing so it really can't care. You of course can't feed in the original voltage, yo have to feed in the lower voltage appropriate for the winding that is now the primary.
- Transformer size is determined by the kVA of the load.
- Load voltage, or secondary voltage, is the voltage needed to operate the load.
- Line voltage, or primary voltage, is the voltage from the source.
- Single-Phase has two lines of AC power.
A transformer is defined as a passive electrical device that transfers electrical energy from one circuit to another through the process of electromagnetic induction. It is most commonly used to increase ('step up') or decrease ('step down') voltage levels between circuits.
There are three basic parts of a transformer: an iron core which serves as a magnetic conductor, a primary winding or coil of wire and. a secondary winding or coil of wire.
Transformers are most commonly used for increasing low AC voltages at high current (a step-up transformer) or decreasing high AC voltages at low current (a step-down transformer) in electric power applications, and for coupling the stages of signal-processing circuits.
A transformer consists of two electrically isolated coils and operates on Faraday's principal of “mutual induction”, in which an EMF is induced in the transformers secondary coil by the magnetic flux generated by the voltages and currents flowing in the primary coil winding.
Which is true of a step-down transformer but not a step-up transformer? The core is made of copper and the coils are made of iron. ... The primary winding has fewer coils than the secondary winding. The primary winding has more coils than the secondary winding.