一起35kV不接地系统单相弧光接地事故分析  

Single Phase Arc-Earthing Accident Analysis of a Case of 35kV Non-Effective Ground System

作　　者：韩炜炜[1] 黄鑫[1] 李启鹏 杨海华 HAN Wei-wei;HUANG Xin;LI Qi-peng;YANG Hai-hua(Nari-Relays Electric Co.,Ltd,Nanjing 211102,China)

机构地区：[1]南京南瑞继保电气有限公司,江苏南京211102

出　　处：《电工电气》2018年第6期46-49,共4页Electrotechnics Electric

摘　　要：某220 kV变电站的35 kV不接地系统中,因单相接地故障引起的弧光接地过电压,导致滤波支路过流保护动作及多处设备损坏。阐述了事故的发生过程,分析了事故电压波形并找出现场故障原因。基于PSCAD/EMTDC软件建立了包含弧光接地故障的现场仿真模型,分析了间歇性弧光接地引起的过电压过程,仿真结果验证了该事故是由于间歇性弧光接地引起系统故障的分析,并提出了相应解决方案。There was a single-phase ground fault of arc-earthing overvoltage causing filtering circuit over-current protective action which occurred in a 220 kV substation where the 35 kV system was non-effective grounded. Lots of equipments were damaged because of the non-continuous single-phase ground fault. This paper expounded the generating process of the accident, analyzed the accident voltage waveform and founded the field failure causes. The field simulation model including arc-earthing was established by using the common electromagnetic transient simulation software PSCAD/EMTDC. This paper analyzed the generating process of the overvoltage caused by the intermittent arc-earthing. The simulation results verify that this accident is caused by intermittent arc-earthing and the corresponding solution is proposed to avoid these incidents.

关 键 词：弧光接地 过电压 PSCAD/EMTDC软件 事故原因分析 

分 类 号：TM864[电气工程—高电压与绝缘技术]