摘要
35 kV系统中铁磁谐振过电压频繁发生,对系统造成很大的危害。利用理论分析和EMTP-RV仿真相结合的方法,分析了中国35 kV系统3种中性点接地方式(中性点不接地、经消弧线圈或小电阻接地)下由电磁式电压互感器(PT)饱和引起的铁磁谐振过电压,研究结果表明,在中性点经消弧线圈或小电阻接地系统中,只要消弧线圈或小电阻的参数选取合适,能够将中性点位移电压限制在电压三角形内,可有效抑制铁磁谐振的发生。
Frequent ferroresonance overvoltage in 35 kV power system does serious harm to itself. This paper studies the impact of three main neutral grounding modes （i.e. isolated neutral, grounding via are suppressing coil, and grounding via low resistance） of a 35 kV power system on the ferroresonance overvoltage induced by PT saturation through theoretical analysis and EMTP-RV simulation. The results show that as long as suitable parameters are chosen for are suppressing coil or low resistance, neutral displacement voltage of the 35 kV power system grounding via arc suppressing coil or low resistance can be limited in the voltage triangle to effectively suppress ferroresonance.
出处
《高压电器》
CAS
CSCD
北大核心
2010年第1期93-96,共4页
High Voltage Apparatus
关键词
铁磁谐振
中性点
接地方式
消弧线圈
小电阻
ferroresonance
neutral
grounding mode
are suppressing coil
low resistance
