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.