配电网间歇性电弧接地过电压的仿真分析与对策  

Simulation of Intermittent Arc Earthing Over-voltage and Countermeasure

作　　者：韩爱芝 曾定文 鲁铁成[2] 

机构地区：[1]平顶山供电公司,河南平顶山467000 [2]武汉大学电气工程学院,湖北武汉430072

出　　处：《高压电器》2010年第1期72-75,共4页High Voltage Apparatus

摘　　要：在中性点不接地系统中,因间歇性电弧接地产生的过电压较高,且持续时间长,可能危及设备绝缘,甚至引起相间短路。采用仿真计算的方法,研究了10 kV和35 kV系统的间歇性电弧接地过电压,计算结果表明过电压的大小与系统参数、接地电弧的熄弧时间、电弧重燃次数和弧道电阻等因素有关。在最不利的情况下,过电压可达4.5倍以上。并结合实际系统提出了多种防范措施。In ungrounded systems, the over voltage caused by intermittent arc earthing is high with long duration, which is harmful to the insulation of electric equipment, and even causes inter-phase short circuit fault. In this paper, simulations about 10 kV and 35 kV systems are performed to investigate the intermittent arc earthing over-voltage, and the results show that over-voltage level is related to system parameters, arc extinction time and number, arc resistance, and so on. In the worst circumstance, the over-voltage can increase by 3.5 times. Moreover, some countermeasures to prevent intermittent arc earthing over-voltage are suggested for actual system.

关 键 词：中性点不接地系统 间歇性电弧过电压 仿真 防止对策 

分 类 号：TM862[电气工程—高电压与绝缘技术]