A low-voltage transformer is a device that is composed of a primary coil, a secondary coil and an iron core (magnetic core) to change the voltage through electromagnetic induction. In electrical equipment and wireless circuits, it is often used for voltage rise and fall, impedance matching, safety isolation, etc. The functions of the transformer mainly include: voltage transformation; current transformation, impedance transformation; isolation; voltage regulation (magnetic saturation transformer), etc.
The high and low voltage transformers begin to be overloaded. The continuous increase of the current will increase the degree of copper loss correspondingly, and the corresponding calorific value will also increase proportionally. The rapid cooling of the temperature increases the possibility of transformer damage.
Transformers are generally installed in the outdoor environment, which is greatly affected by external environmental factors. During equipment installation and construction, lightning protection settings are generally regarded as the key link. After all kinds of lightning protection construction, the possibility of transformer being struck by lightning is relatively small, but once it occurs, the impact is very bad, so it is also one of the main reasons for transformer failure. Under normal circumstances, unless there are clear characteristics to prove that it is a lightning accident, the impact fault is basically classified into "line inrush current".
The heat generated by the transformer and surrounding equipment during operation will damage the insulation, accelerate the aging of the insulation, reduce its function, and cause serious transformer failures. Compared with the normal operation effect of insulating transformers, the service life of transformers with aging insulation is greatly reduced, which not only increases the risk of equipment operation, but also increases capital investment.