摘要
小其培电站投产后,3号发电机多次出现基波零序电压定子接地保护动作跳闸,其输出的10 kV母线出现较大电压不平衡问题,困扰该电站多年。通过分析研究查明原因并对该发电机出口供电线路实施加装隔离变压器的改造,解决了定子接地保护经常动作跳闸的问题。
Since the initial operation of Chipwi Nge Hydropower station, a problem of the stator grounding protection trips due to fundamental wave zero-sequence voltage occurred for many times in the No.3 generator,and a large voltage imbalance took place in the output 10 kV line, which troubled the power station for many years. Based on analyses, the fault causes are found out and transformations are carried out by adding a isolation transformer at the output line of the generator, which solves the problem of frequent trips of stator grounding protection.
作者
郑福民
陈华
唐明武
刘俊红
张发强
ZHENG Fumin;CHEN Hua;TANG Mingwu;LIU Junhong;ZHANG Faqiang(Chipwi Nge Hydropower Company of CPIC Yunnan International Power Investment Co.,Ltd.,Baoshan 678099)
出处
《电力安全技术》
2022年第3期34-38,共5页
Electric Safety Technology
关键词
水力发电
变压器
定子接地保护
供电方式
跳闸
hydropower
transformer
stator grounding protection
power supply mode
trip
