防止发电机失磁进相引起过流保护误动作的研究

为了保证励磁系统电压稳定性,一些发电机是允许进相同步运行的,而随着电网系统的不断增大,系统的无功储备更加充足,这也为单个机组低励进相稳定运行提供了保证。文章分析了发电机失磁运行的特性,阐述了发电机失磁进相时的物理过程,以及导致过流保护误动作的原因,并结合南京梅山能源有限公司现有发电机失磁保护的现状,提出了具有可操作性的预防措施,提高了发电机过流保护的可靠性。

Research on the False Action of Avoiding Generator Loss of Excitation Overcurrent Protection in Phase Advance

In order to ensure the stability of electric system voltage,some generators are allowed to run synchronously.With the increasing electric system,volume capacity of var becomes more abundant,and it makes sure single generator loss of excitation works steadily.This paper analyzes the characteristics of generator loss of excitation,illustrates the physical process in phase advance and the causes for overcurrent protection.It further combines the current situation of generator loss of excitation in Nanjing Meis...