异步电动机失电残余电压的防范与应用

Countermeasure and Application for the Residual Voltages of AM after Stator Supply Disconnection

对异步电动机失电残余电压的产生进行分析,建立了异步电动机失电残余电压仿真计算模型,并进行仿真计算。失电残余电压的存在,对重合闸的异步电动机将产生较大的冲击电流及冲击转矩。本文对失电残压的防范方法进行研究,提出减小失电残压对电机起动冲击的措施及存在失电残压情况下电动机群再起动方法。失电残压在有些情况下是可以利用的,本文对利用失电残余电压诊断异步电机转子绕组故障进行研究。

The generation of the residual voltage for asynchronous motor after AC Dump (RVACD) is analyzed, it establishes the simulation calculation model and carries out simulation calculation. The existence of RVACD will produce higher impact current and torque to asynchronous motor during reclosing. The countermeasure for RVACD is investigated, the some measures were presented to limit RVACD's impact on the motor's start-up. Then it points out the restarting method for group motors under RVACD. However, RVACD can be utilized in some cases, diagnosis of rotor winding for asynchronous motor is researched by RVACD.