Transformer power:

Electric furnaces are powerful consumers of electric energy. The operating voltage of a furnace is 100-800V and the current may reach several thousand amperes. The furnace transformer  transforms high voltage energy into low voltage. The melting process consists of two periods: melt-down and refining period. In melt down period higher electric energy is required as compared with the refining period.

In small furnaces, the power consumption for melting is about  and it falls to   in big furnaces. Additional 150 to 400  power is required during refining

depending on the practice

Large transformers are required to run electric arc furnaces. During melting more power is required than during refining. The transformer capacity is designed to suit melting requirements. The capacity of the transformer is usually 470- 650 KVA per tonne of furnace capacity. In terms of hearth area, the transformer capacity is in the range of 750-900 KVA per square meter