First, transformer capacity in our country is calculated by standard calculation formula, so there is no accurate answer. 10 kV transformers are very common from 30, 50, 80, 100, 160, 200, 250, 315, 400, 500, 630, 800, 1000, 1250, 1600, 2000 and 2500 kVA.
II. Main Classifications of Transformers:
1. By phases:
1) Single-phase transformer: for single-phase load and three-phase transformer group.
2) Three-phase transformer: used for three-phase system voltage rise and fall.
2. By use:
1) Power transformer: used for the rise and fall voltage of power transmission and distribution system.
2) Instrument transformer: such as voltage transformer, current transformer, measuring instrument and relay protection device.
3) Test transformer: can produce high voltage, high voltage test for electrical equipment.
4) Special transformers:
3. According to the cooling mode:
1) Dry Transformer
2) Oil-immersed transformer
4. According to winding form:
1) Double winding transformer
2) Three-winding transformer
5. According to the form of iron core:
1) Core transformer: power transformer for high voltage.
2) Amorphous alloy transformer: Amorphous alloy iron core transformer is a new type of magnetic conductive material. Its no-load current decreases by about 80%. It is an ideal distribution transformer with energy-saving effect. It is especially suitable for low load ratio areas such as rural power grid and developing areas.