关键词: 半连续工艺, 负荷分级, 电压选择, 接地型式, 地面主变（配）电所, 矿区变（配）电所

Abstract: Introduces several problems that need to be paid attention to in the design of power supply and distribution of semicontinuous process in opencast iron mine,including the classification of power load,selection of distribution voltage,system earthing type,layout of power transformation and distribution,etc.

Key words: Semicontinuous process, Load classification, Voltage selection, System earthing types, Surface main substation(distribution station), Mining area substation(distribution station)