摘要
本通过对QFW-15-2无刷励磁同步发电机定子310保护误动作案例的原因分析,阐述了保护装置动作后事故处理的一般流程,论证了电力电缆屏蔽层保护接地点在零序电流互感器位置之上接地的潜在危害,分析了单芯电缆屏蔽层两端同时接地导致零序电力互感器产生感应电流的原因,进一步验证了单芯电缆屏蔽层感应电流导致定子310保护误动作的可能性。
This paper,according to the analysis on the cause of QFW-15-2 brushless excitation synchronous generator＇ s stator 310 protection malfunction cases, explains the general process of accident treatment after function of protective devices, demonstrates the potential hazards caused by the grounding of protection ground point of power cable＇ s shielding layer conducted on the zero sequence current transformer, analyzes the cause of induced current generated by zero sequence power transformer as the result of simultaneous grounding of both ends of single-core cable＇ s shielding layer,and further validates the possibility of stator 310＇ s protection malfunction caused by the induced current of single-core cable＇ s shielding layer.
关键词
零序电流
定子310保护
保护误动作
Zero-sequence current
Stator 310 protection
Malfunction of protection
