龙滩水电站机组轴电流保护

Shaft Current Protection of Longtan Hydropower Generators

介绍了水轮发电机组轴电流产生的原因和危害,以及常规轴电流保护和龙滩水电站机组轴电流保护的原理,可以看出龙滩水电站机组轴电流保护在设计原理上更为先进可靠,其轴电流保护不仅可以避免因电流互感器二次侧输出而受外界电磁或负荷电流变化干扰,而且可以在轴电流产生前报警,防止事故发生。另外,龙滩水电站轴电流保护在运输、安装、维护和数据采集等方面比常规轴电流保护更具优势。针对龙滩水电站机组轴电流保护在运行期间出现的异常情况,简要总结了运行维护中需要注意的事项。

This paper introduces the causes and corresponding hazard of the shaft current of hydro-generating units as well as the principle of conventional shaft current protection and the shaft current protection of Longtan Hydropower generators. It is obvious that the shaft current protection of Longtan Hydropower plant are more advanced and reliable in principle than that of the conventional shaft current protection, because it can be actuated correctly even in the presence of disturbances caused by external electromagnetic interference or changes in load current and it can also prevent the occurrence of accident by providing alarming before the formation of shaft current. In addition, the shaft current protection of Longtan Hydropower plant has more advanced features in transportation, installation, maintenance, and data acquisition than the conventional shaft current protection. According to abnormalities of the shaft current protection of Longtan hydropower plant during its operation, some points that need to pay attention to are also summarized briefly.