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    Suzhou Electric Appliance Research Institute
    期刊號: CN32-1800/TM| ISSN1007-3175

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    一起35 kV不接地系統單相弧光接地事故分析

    來源:電工電氣發布時間:2018-06-15 14:15 瀏覽次數:655
    一起35 kV不接地系統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不接地系統中,因單相接地故障引起的弧光接地過電壓,導致濾波支路過流保護動作及多處設備損壞。闡述了事故的發生過程,分析了事故電壓波形并找出現場故障原因?;赑SCAD/EMTDC軟件建立了包含弧光接地故障的現場仿真模型,分析了間歇性弧光接地引起的過電壓過程,仿真結果驗證了該事故是由于間歇性弧光接地引起系統故障的分析,并提出了相應解決方案。
        關鍵詞:弧光接地;過電壓;PSCAD/EMTDC軟件;事故原因分析
        中圖分類號:TM864     文獻標識碼:B     文章編號: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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