Besides capacity of electric arc furnace

the production conditions such as chaining

melting steel grade

steelmaking process and production flow sheet influence the determination of rating capacity of transformer for electric arc furnace

It has been obtained by analysis that for ultra-high power (UHP) electric arc furnace using scrap charging the relation fbnnula between rating capacity of transformer P

n

and parameters- electric power consumption W

transformer power utilization ratio G

total power.on time and steel tapping tonnage W is P

n

= (W*G

60)/(t

on

·cosφ·C

2

)，and the setting method of transformer's secondary voltage is given. Combined with high-impedance techniques

the methods to determine the reactance capacity and transformer technical parameters of UHP electric arc furnace and the idea to determine the section

of graphite electrode are presented in this paper.