What will happen to the transformer if DC voltage is applied to the primary winding?

Answer 1

DC current will not pass through a transformer, in the sense that a DC current on the primary will not produce a DC output from the secondary. A constant DC current will not produce any output from the secondary but there may be transient effects as the DC current is connected or disconnected (in which case, it's really an AC current, isn't it?) More about this below because I don't think that's really the question. If you pass DC current through either winding of a transformer, two things will happen. First, you will heat up the transformer and, if you have enough DC current, you will burn it out. Second, you will induce a magnetic field in the core. The more current, the closer the core gets to "saturation" or the maximum field it can support. This is important if there is both DC and AC current present because the more DC field in the core, the less core capacity is available to "transform" AC current. As the core operates closer to saturation, the AC waveform will be distorted and some of the AC power will be lost to heating the transformer. For example, if the primary of a transformer is connected to an AC source, and a DC source is connected to the secondary, then the primary current drawn by the transformer will increase, possibly enough to destroy the transformer. There are special Transformers, called magnetic amplifiers, which take advantage of this effect to use a DC current to modulate an AC current. There are transient effects of DC currents in a transformer winding. As the DC current magnetizes the core, energy is stored. When the DC current is disconnected, this stored energy wants to leave the core. It can do this by inducing a voltage in either of the windings. If both windings are open circuit, this voltage can be very high. So you may see a spark jump when the DC voltage is disconnected. In a large transformer, this discharge may break down the transformer insulation and damage it. Some switching power supplies take advantage of this effect in which case the transformer is wound slightly differently and called a "coupled inductor."

Answer 2

You will burn the transformer up. The transformer is only rated at 110 volts, therefore, putting 220 volts to it would be doubling the rating and essentially burn it up as soon as you plugged it in. Actually, they would not even have the same plug type, you would have to hard wire it to watch it explode. LOL

Answer 3

no, flux produces therefor no induction in secondary transformer.....

Answer

Because the primary winding has relatively low resistance, if the d.c. voltage is equivalent to the rated a.c. voltage, it is likely that the primary winding will overheat, its insulation will fail, and a short circuit will likely occur... seriously damaging the winding. In the meantime, no voltage will be induced into the secondary winding, because an alternating flux is needed.

Answer 4

If you apply DC to a transformer, the current in the transformer will rise quickly, depending on inductance, until the available DC current max'es out, the protective device trips, a fire starts, or the transformer blows up, whichever comes first.

DO NOT CONNECT DC TO A TRANSFORMER.

Answer 5

Depends on the voltage applied to it and the transformer impedance. You could burn up the coils if the electrical pressure (V) is high enough to push a large amount current(surpassing the transformer rating) through the low Z coil to ground.