异步电动机断电后重合闸的非同期冲击和防护措施

Non-Synchronous Impact and Protection Measures of Reclosing after Asynchronous Motor Outage

大型高压异步电机的事故损坏或突然停机会导致巨大的经济损失和生产混乱。分析了大型高压异步电动机在电源短暂中断后又重新恢复的瞬间,定子旋转磁场和转子续流磁场之间,由于"失步"而可能造成的非同期冲击,以致电机严重损坏,并提出了快速灭磁低压重合闸和快速准角重合闸的保护原则。只需要选取合适的重合闸时间,就可以把非同期冲击减少到最小程度,保证异步电机运行的连续性。

The damage or suddenly shut-down of large high voltage asynchronous motor would lead to enormous economy loss and production chaos. In the power supply of large high voltage asynchronous motor after a short suspension and restore moment, between stator field and rotor free-wheeling magnetic field, there would produce non- synchronous impact which was caused by ＂ out of step＂, consequently leads to serious motor damage. And the protective principle for fast destroy magnetic low voltage reclosing and fast prospective angle reclosing was proposed. Only need choose the suitable time of reclosing, the damage level of non-synchronous impact would be reduced to the minimum to ensure safe-operation of asynchronous motor.