What is the cause of transformer overcurrent?

What is the cause of overcurrent in the compressor?
If the so-called overcurrent refers to the input current overcurrent of a transformer, there may be the following reasons:
1. Transformer saturation. As is well known, transformer windings exhibit inductance under alternating current, with a high AC impedance that is proportional to the magnetic permeability. At the same time, magnetic materials all have a saturation magnetic flux density. If the transformer is not designed properly or biased, the working magnetic flux density of the transformer will be too high. When it is greater than the saturation magnetic flux density, the magnetic permeability will drop to 0. At this time, the AC impedance of the transformer is only the resistance impedance, which is equivalent to directly connecting the positive and negative poles of the power supply to a wire. The consequences can be imagined. In switch mode power supplies, this phenomenon often occurs in push-pull topologies, where capacitors are connected in series on the primary side to solve the problem of magnetic bias.
2. Load short circuit!!
3. The insulation of the transformer winding is not well done, resulting in inter-turn short circuits or short circuits in the primary and secondary windings.
4. Some characteristic issues with magnetic core materials, such as not considering the effects of DC bias and temperature on magnetic permeability during design, can to a decrease in transformer winding impedance and overcurrent under high temperature and high DC bias.