Furnace transformer is designed to meet the requirement of power supply to electric furnace as this lowers the high voltage supply to the furnace. Furnace Transformers is designed to resist the high levels of electrical, thermal and mechanical stresses to which they are subject to during utilization. The furnace transformer thus has special features to handle such high currents as compared to conventional transformers. Other elements that are taken into consideration when designing furnace transformer are high secondary currents (in kAmps) and wide range of secondary voltages which are generally regulated by means of an on-load tap changer (OLTC).
The electric arc furnace has three electrodes connected to the secondary terminals of furnace transformer. The secondary terminals of transformer are subject to frequent short circuits during melting process through the charge and arc. Hence the furnace transformer needs to withstand these frequent short circuits and high currents.
In the mining & metal industry, these transformers seek huge appreciation. The types, voltage and cooling modes vary in order to perfectly cater the needs of the application areas. The excellent cooling modes like forced water cooling mode, self-cooling mode, etc., also make these transformers highly efficient in working.