摘要
针对某大型发电机组在并网前升压过程中和停机检修中发生的定子接地保护动作事件,首先通过对保护动作时刻录波图数据的分析,初步判断故障原因分别为发电机定子A相非金属性接地和电干扰,接着经过分段排除和零起升压等方法,确定两起事件均由电缆安装问题造成,最后提出相应的防范措施。
In view of the stator grounding protection action events of a large generator during the step-up process before grid connection and during shutdown maintenance, firstly, the data of the recording chart of the protection action time are analyzed, and the preliminary judgment is made that the fault causes are the phase A non-metallic grounding of the stator of the generator and the electric interference. Secondly, by means of sectional exclusion method and stepping up from zero voltage method, it is determined that both incidents are caused by cable installation problems. Finally, the preventive measures are put forward.
作者
钟燕飞
ZHONG Yanfei(Zhanjiang Zhongyue Energy Co. , Ltd. , Zhanjiang 524000, China)
出处
《电工技术》
2019年第13期70-71,74,共3页
Electric Engineering
关键词
定子接地
非金属性接地
电干扰
电缆
stator grounding
nonmetallic grounding
electrical interference
cable
