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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 harms of shaft current of hydro-generator unit, as well as the principle of conventional shaft current protection and shaft current protection of Longtan Hydropower Station. It can be seen that the shaft current protection of Longtan Hydropower Station is more advanced and reliable in design principle. Axial current protection can not only avoid the secondary side of the current transformer output by the external electromagnetic or load current changes in interference, but also in the axis current before the alarm, to prevent accidents. In addition, the axial current protection of Longtan Hydropower Station is superior to conventional shaft current protection in transportation, installation, maintenance and data acquisition. Aiming at the anomalies occurred during the operation of shaft current protection of Longtan Hydropower Station, a brief summary of the matters needing attention in operation and maintenance is given.