基于可变电抗的高压软启动器研究

以高压软启动器为原型,对可变电抗器的系统构建、拓扑结构进行了研究,特别是对可变电抗器的等效模型进行了深入分析。给出了可变电抗器的等效电路以及图形分析。在系统仿真实验中,使用的启动电机型号为JQR630-8三相异步电动机,通过仿真实验,得到了电流的仿真图形。在全压直接启动时,电动机最大定子电流为额定电流的6.4倍,而采用可变电抗式软启动器启动时最大定子电流仅为额定电流的1.9倍,减小了电动机的启动电流,从而达到了保护电动机和设备的目的。

Research on high motor soft starter based on variable reactor

Based on the HV motor soft starter,the system structure and topology of its variable reactor are studied.The equivalent model of the variable reactor is graphically analyzed with its equivalent circuit.The JQR630-8 three-phase asynchronous motor is used in the system simulative experiment and its system startup current waveform is got.When the motor is started under full voltage,the maximum stator current is 6.4 times larger than rated current,while when the motor is started with the soft starter of variable reactor,the maximum stator current is only 1.9 times larger than rated current.The motor and other devices are protected because of the reduced startup current.