然后依据电磁理论，分析了继电器吸合时励磁电流的动态变化特征，应用电子技术和计算机技术，设计出了一种电磁继电器二次吸合电压测量系统。
According to the theory of electromagnetism , analyses the dynamic process of relay 's excitation current when close . Then using electronics and computer technology , designed a measuring system of second-time close voltage .
吸合电流