因保护不完善导致机组异常停机分析及处理  

Analysis and Treatment of Abnormal Unit Shutdown Due to Imperfect Protection

作　　者：姜兴文 郑艺远 王挺 胡利 张艳兵 JIANG Xing-wen;ZHENG Yi-yuan;WANG Ting;HU Li;ZHANG Yan-bing(Huaneng Sanghe Secondary Hydropower Co.,Ltd.,Kunming 650200,China)

机构地区：[1]华能桑河二级水电有限公司,云南昆明650200

出　　处：《云南水力发电》2023年第1期202-204,共3页Yunnan Water Power

摘　　要：在电力系统中,10kV系统发生单相接地故障的概率是最大的,故在厂用电系统中需要进行充分论证,以使得厂用电安全、可靠运行,发生故障时,可以快速切除故障,避免因10kV系统发生故障越级跳闸或越级跳机组,使得故障扩大。通过分析觉巴水电站发生的1起10kV系统单相接地因保护配置不完善,导致机组定子接地零序电压高值动作,引发发电机定子接地保护动作,导致事故停机的事件,提出相应处理措施。In power system, the probability of single-phase ground fault occurring in 10kV system is the highest.Therefore, it is necessary to fully demonstrate in the plant power system in order to ensure safe and reliable operation of the plant power. In case of failure, the fault can be quickly removed to avoid tripping or tripping units due to failure of 10kV system, so that the fault can be enlarged. According to the analysis of single-phase ground protection configuration of 10kV system in Jueba Hydropower Station, which results in high zero-sequence voltage action of stator ground of unit and stator ground protection action of generator, the accident shutdown event is caused, and corresponding treatment measures are put forward.

关 键 词：水轮发电机 单相接地 零序电压保护 异常停机 

分 类 号：TV737[水利工程—水利水电工程]