一起35 kV不接地系統(tǒng)單相弧光接地事故分析
韓煒煒,黃鑫,李啟鵬,楊海華
(南京南瑞繼保電氣有限公司,江蘇 南京 211102)
摘 要:某220 kV變電站的35 kV不接地系統(tǒng)中,因單相接地故障引起的弧光接地過(guò)電壓,導(dǎo)致濾波支路過(guò)流保護(hù)動(dòng)作及多處設(shè)備損壞。闡述了事故的發(fā)生過(guò)程,分析了事故電壓波形并找出現(xiàn)場(chǎng)故障原因。基于PSCAD/EMTDC軟件建立了包含弧光接地故障的現(xiàn)場(chǎng)仿真模型,分析了間歇性弧光接地引起的過(guò)電壓過(guò)程,仿真結(jié)果驗(yàn)證了該事故是由于間歇性弧光接地引起系統(tǒng)故障的分析,并提出了相應(yīng)解決方案。
關(guān)鍵詞:弧光接地;過(guò)電壓;PSCAD/EMTDC軟件;事故原因分析
中圖分類號(hào):TM864 文獻(xiàn)標(biāo)識(shí)碼:B 文章編號(hào):1007-3175(2018)06-0046-04
Single Phase Arc-Earthing Accident Analysis of a Case of 35 kV Non-Effective Ground System
HAN Wei-wei, HUANG Xin, LI Qi-peng, YANG Hai-hua
(Nari-Relays Electric Co., Ltd, Nanjing 211102, China)
Abstract: 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.
Key words: arc-earthing; overvoltage; PSCAD/EMTDC software; accident cause analysis
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