A transformer is a very important electrical device in a power system. Its main function is to transform the AC voltage from one voltage level to another. In the power system, transformers are widely used in power transmission, power transformation and power distribution, and play a very important role.

The transformer is composed of two or more coils insulated from each other, and the transformation of electric energy is realized through magnetic coupling. Among them, one coil is called the primary coil, and the other coil is called the secondary coil. When current flows in the primary coil, a magnetic flux is generated in the core, which excites a voltage in the secondary coil.

The main performance parameters of transformers include transformation ratio, rated power, rated voltage, rated current, no-load loss and load loss, etc. Among them, the transformation ratio refers to the ratio between the input voltage and the output voltage of the transformer, the rated power refers to the rated output power of the transformer, the rated voltage refers to the rated output voltage of the transformer, the rated current refers to the rated output current of the transformer, and the no-load loss refers to The power consumed by the transformer in the no-load state, and the load loss refers to the power consumed by the transformer in the load state.

The selection of the transformer should be carried out according to the actual needs, including the capacity, voltage level, wiring mode and protection measures of the transformer. At the same time, during the use and maintenance of the transformer, it is also necessary to pay attention to safety measures to ensure the normal operation of the transformer.