Frequent no load operation of furnace transformer due to smelt need generates unavoidably exciting inrush current and affects safe and stable operation of the 2 nd filter branch of electric furnace. In view of fuse case of the 2 nd filter capacitor at certain steel plant and with combination of generation mechanism of exciting inrush current and analysis of actually measured data

the mechanism of influence of exciting inrush current on the 2 nd filter branch is studied and

on the basis of the simulation result of different types of the2 nd filter branch

the design method of the 2 nd filter branch of electric furnace considering exciting inrush current is proposed

which has important guidance for the optimization design and stable operation of the 2 nd filter branch of the electric furnace.