The structure and function of the excitation system of Guandi Hydropower Station are introduced. Taking a SCR ( Silicon Controlled Rectifier) breakdown of the rectifying device in operation of the station as an example, an analysis focusing on the cause and the process of the SCR breakdown that led to a burnout of the rectifier cabinet was carried out. According to the device damage at the scene of the accident and the records in the relay protection device, the countermeasures and prognostic measures were put forward based on the proper analysis of the cause of the accident. A device test after the accident treatment showed that the device was restored to normal state, which proved that the countermeasures were effective and appropriate. These measures can serve as references to prevent similar accidents in hydropower stations and ensure safe and stable operation of the excitation system in large generator-units.%对官地水电站水力发电机组励磁系统的结构和功能作了介绍,并以该水电站大型整流装置在实际运行中出现的一次可控硅击穿事故为例,重点对由于励磁可控硅击穿所导致的整流柜烧毁事故的起因、过程展开了分析研究. 根据现场设备受损情况和继保设备的记录数据,在合理分析发生事故原因的基础上,提出了相应的事故处理和预后措施. 对处理后的设备进行了试验,试验结果表明,设备状态已完全恢复,说明所采取的处理措施有效、合理,可为预防水电站出现类似故障,确保大型水力发电机组励磁系统安全稳定运行提供有益的借鉴.
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