The running voltage of smelting furnace is about 140 volt, and electrode current is as high as several thousands ampere. The contact technology and the control exist much difficult problem when the reactive power compensation is used to so large current.

• 矿热炉工作在140V左右的低电压下,并且电极电流高达几万安培,要对这么大的电流进行无功补偿,不仅存在许多接触工艺上的困难,还给控制上提出许多难题。