大型同步电动机逆功率保护装置延时研究

Study on the Reverse Power Protection Time Delay of Large Synchronous Motor

应用电力系统机 - 网相互作用数字仿真技术研究大型高压同步电动机在电力系统发生短路故障时的动态行为 ,通过分析计算电动机在供电系统发生故障情况下所受到的冲击电流、冲击转矩、机组轴系所承受的最大应力和疲劳损耗 ,以及电动机与系统之间的暂态稳定性等 ,确定同步电动机逆功率保护装置的最佳延时时间。

Based on the numerical simulation of the interaction between motor and power system,the dynamic behavior of large synchronous motor is studied when faults occur in power system.The best time delay of synchronous motor reverse power protection can be determined by calculating the impact current and impact torque of motor,the maximum stress and tiredness loss it can sustain and the transient stability between motor and system when faults take place in the power system.The calculation example shows the feasibility of proposed method.