中性点经相控式消弧线圈接地电压互感器损坏事故分析  

Analysis of PT Damage Accident of Neutral Point via the Phase Controlled Arc Suppression Coil Grounding System

作　　者：徐近龙[1] 张劲松[2] 王建刚[1] 袁超[2] 周阳[1] 

机构地区：[1]国网苏州供电公司,江苏苏州215004 [2]江苏方天电力技术有限公司,江苏苏州211102

出　　处：《电力与能源》2015年第5期676-681,共6页Power & Energy

摘　　要：江苏某变电站中性点经相控式消弧线圈接地的10kV系统连续发生三起因线路单相接地故障导致电磁式电压互感器烧毁事故,为了明确故障产生的原因,分析了故障发展过程,利用电磁暂态仿真软件EMTP对故障进行了复现。通过仿真分析认为,事故是由于系统中相控式消弧线圈的可控硅未及时导通,使消弧线圈没有投入运行,在电弧燃烧过程中电压互感器中出现高幅值冲击电流导致的。Three voltage transformers were destroyed because of single-phase grounding fault in a substation in Jiangsu during 2013.In order to find out the fault reason,fault process was analysed,and the electromagnetic transient simulation software EMTP was used to repeat the accident.The simulation analysis reveals that the SCR is not reliable and the arc suppression coil is not operational.The high impulse current in the voltage transformer during the arc burning is the main cause of the accident.

关 键 词：电压互感器 单相接地 电磁仿真 冲击电流 过电压 

分 类 号：TM862[电气工程—高电压与绝缘技术]