摘要
电磁式电压互感器铁磁谐振引起的过电压是中性点不接地电网中最常见的一种内部过电压故障。对某电厂一起铁磁谐振停机事故进行分析,依据电磁式电压互感器铁磁谐振的发生原因,提出微机消谐装置在消除间歇性接地故障造成的铁磁谐振时存在的局限性,并从一次设备选型、微机消谐装置的完善、继电保护配置角度提出防止铁磁谐振的技术措施。
Overvoltage caused by electromagnetic voltage transformer ferroresonance is one of the most common internal overvoltage faults in ungrounded grid.Through case analysis of a typical ferroresonance in one power plant,on basis of the causes of ferromagnetic resonance,this paper points out the limitation of microcomputer in eliminating intermittent harmonic elimination of the ferromagnetic resonance caused by earth fault.To prevent ferroresonance,technical measures are put forward from various aspects such as equipment type selection,optimization of computer harmonic elimination,relay protection configuration.
出处
《山东电力技术》
2015年第8期57-59,70,共4页
Shandong Electric Power
关键词
中性点不接地系统
电压互感器
铁磁谐振
微机消谐
isolated neutral system
potential transformer
ferromagnetic resonance
computer harmonic elimination
