Power transformers may be separated into 4 main groups according to its usage purposes;

• Generator (step-up) transformers:
They are generally connected to the generator outputs of electricity production plants between 6,3 kV – 36 kV and connected to the transmission lines by high voltage coil.
• Network transformers 
They are generally used as reducer in transformer centres. 
• Industrial transformers 
They work as reducer in industrial facilities. 
• Special transformers 
Furnace transformers may be separated as furnace reactors, serial shunt reactors, current rectifiers, phase-shifter transformers.
Astor Transformer performs the manufacturing of power transformers within its body in the capacity between 5 – 200 MVA, 36 kV – 300 kV with the personnel
experienced in their fields.