of electrical arc furnace transformers. Normal range arc has low specific apparent average power density in the order of 200-400 kVA / ton. A transformer supplying power to a furnace has to handle extremely high value currents in the order of kAmps. (10 to 60orhigher depending upon furnace ratings).
The furnace transformer thus has special features to handle such high currents as compared to conventional transformers. The electric arc furnace has 3 electrodes connected to the secondary terminal