It is composed of four parts: DC ( Direct Current) power supply, resonance charging and polarity reverse unit, electric relay control unit and computer control unit. 它主要由四部分组成:三相整流直流电源,谐振充电及电压反向单元,继电器控制单元,计算机控制单元。
Study of zero sequence current reverse in transformer relay coordination 变压器零序过电流保护整定中零序电流反向问题的研究