The rated capacity of the transformer refers to the common value of the apparent power next to the main and branch. The capacity required on the factory nameplate of the transformer is the rated capacity, which means that the tap power switch is located in the main tap, which is the product of the rated full voltage, rated current and the relative phase index. For three-phase transformers, the total rated capacity is equivalent to =3×rated phase voltage×phase current, and the rated capacity is generally expressed in kVA or MVA.

The rated capacity is the ability to continuously output a larger capacity during the required normal service period, such as 30 years. In fact, the output capacity is the product of the voltage when there is a load (in the case of an inductive load, the voltage when the load is lower than the rated full-load voltage), the rated current and the relative index.

The rated capacity refers to the common value of the apparent power following the main points. The capacity required on the factory nameplate of the transformer is the rated capacity, which means that the tap power switch is located in the main tap, which is the product of the rated full load voltage, the rated current and the relative phase index. For a three-phase transformer, the rated capacity is equivalent to =3×rated phase voltage×phase current, and the rated capacity is generally expressed in kVA or MVA.