What is the reason for transformer overcurrent?

The so-called overcurrent If it means that the transformer input current is overflow, there may be the following reason:
1. Saturation of transformer, well known, transformer windings exhibit inductive at alternating current, and its AC impedance is large, and its impedance size is proportional to the magnetic permeability. At the same time, the magnetic material has a saturated magnetic flux density. If the transformer is designed or the phenomenon occurs, the transformer operates too high. When it is greater than saturated magnetic dense, the magnetic permeability is 0. The transformer AC impedance is substantially The remaining resistance impedance is equivalent to directly connecting the power supply positive and negative, and the consequence is conceivable. This phenomenon often occurs in the push-pull topology, which generally solves the bias magnetic problem in the primary capacitance.
2. Load short circuit! !
3. The transformer winding is not done well, there is a short circuit or the original side winding short circuit.

4. Some magnetic core materials are characterized, such as design, not considered DC bias and temperature on magnetic permeability, under high temperature and high DC bias, resulting in reduced transformer winding impedance, overcurrent.