摘要
根据北京某220 kV变电站曾发生的铁磁谐振现象,利用电磁暂态软件分析了该变电站220 kV母线上接有电磁式电压互感器时,由于互感器和断路器并口电容组成了谐振回路,从而导致的铁磁谐振发生的概率。并且根据消除谐振回路的抑制铁磁谐振的思路,将母线上的电磁式电压互感器全部更换为电容式电压互感器后在电磁暂态软件下模拟。结果表明,对上述两种情况分别进行500次分断路器操作,带有电磁式电压互感器时发生谐振的可能性很大,而换成电容式电压互感器后发生谐振的可能性几乎为零。因此,用电容式电压互感器代替电磁式电压互感器从根本上消除了铁磁谐振回路,是一种效果很好的铁磁谐振抑制措施。
According to a ferroresonance accident occurred at one 220 kV station in Beijing, Authors use electromagnetic transient simulation software to simulate the probability of ferroresonanee occurrence when inductive voltage transformer connected to the station＇s 220 kV bus line and breaker parallel capacitance form a resonance circuit. According to some ferroresonance restraining measures, the inductive voltage transformers are replaced with capacitive voltage transformers. Finishing 500 switch operations ,some results are obtained. When bus was connected with inductive voltage transformer, there is high possibility to occur ferroresonancc when doing switch operations. While using capacitive voltage transformer,there is no such possibility. Therefore,to replece inductive voltage transformer with capacitive voltage transformer is a good measure to restrain ferroresonance.
出处
《华北电力技术》
CAS
2006年第3期7-10,共4页
North China Electric Power
关键词
中性点接地系统
铁磁谐振
电压互感器
抑制措施
断路器并口电容
neutral-grounded system
ferroresonance
voltage transformer
restraining measure
breaker parallel capacitance
