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

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    ±800 kV特高壓直流線路地線斷線故障分析

    來(lái)源:電工電氣發(fā)布時(shí)間:2023-03-04 10:04 瀏覽次數(shù):416

    ±800 kV特高壓直流線路地線斷線故障分析

    魏小龍1,張璐2,閆可為3,李新民2,韓彥華2,李偉2,孔志戰(zhàn)1
    (1 國(guó)網(wǎng)陜西省電力有限公司,陜西 西安 710048;
    2 國(guó)網(wǎng)陜西省電力有限公司電力科學(xué)研究院,陜西 西安 710100;
    3 國(guó)網(wǎng)陜西省電力有限公司超高壓公司,陜西 西安 710075)
     
        摘 要:提升抗冰能力對(duì)線路安全運(yùn)行至關(guān)重要。對(duì)某 ±800 kV 特高壓直流線路地線斷線故障現(xiàn)場(chǎng)的環(huán)境及錄波進(jìn)行了分析,開(kāi)展了地線斷口靜態(tài)分析及掃描電鏡試驗(yàn)、拉斷力試驗(yàn),并對(duì)導(dǎo)地線間距進(jìn)行了仿真計(jì)算。試驗(yàn)和仿真計(jì)算表明:特高壓直流導(dǎo)地線覆冰厚度差異較大,隨著地線覆冰厚度的增加,導(dǎo)地線間間距逐漸減小,在大風(fēng)作用下極易發(fā)生空氣間隙不足放電。本次特高壓線路故障原因?yàn)橹馗脖?/span>引起導(dǎo)地線空氣間隙距離不足,導(dǎo)致放電燒傷和拉斷地線。微地形區(qū)線路覆冰情況可能超過(guò)設(shè)計(jì)值,應(yīng)考慮現(xiàn)場(chǎng)實(shí)際覆冰厚度、導(dǎo)地線覆冰厚度差值、故障區(qū)段微氣象和微地形等因素,確保線路設(shè)計(jì)運(yùn)行有充足裕度。
        關(guān)鍵詞: ±800 kV 特高壓直流線路;地線;覆冰;斷線;故障分析
        中圖分類號(hào):TM723     文獻(xiàn)標(biāo)識(shí)碼:A     文章編號(hào):1007-3175(2023)02-0041-06
     
    Analysis of Ground Wire Disconnection Fault of ± 800 kV
    Ultra-High Voltage DC Line
     
    WEI Xiao-long1, ZHANG Lu2, YAN Ke-wei3, LI Xin-min2, HAN Yan-hua2, LI Wei2, KONG Zhi-zhan1
    (1 State Grid Shaanxi Electric Power Co., Ltd, Xi’an 710048, China;
    2 Electric Power Research Institute of State Grid Shaanxi Electric Power Co., Ltd, Xi’an 710100, China;
    3 Ultra High Voltage Company of State Grid Shaanxi Electric Power Co., Ltd, Xi’an 710075, China)
     
        Abstract: To improve the anti-icing ability is vital for safe operation of the line. The paper analyzes the environment and waveform record of the ground wire disconnection fault field of ±800 kV ultra-high voltage(UHV) DC line, makes static analysis of the ground wire fracture,conducts scanning electron microscope and breaking force test, and carries out the simulation calculation of guide wire spacing. According to the test and simulation calculation, there is a big difference of the ground wire icing thickness of UHV DC. When the ground wire icing thickness increases, the spacing between conductors and ground wires gradually decreases which is likely to contribute to discharge because of insufficient air gap under the strong wind. The reason for this UHV line fault is that the insufficient air gap of ground wires caused by icing contributes to discharge to burn and break ground wires. The line icing of micro-terrain region is possible to exceed the design value, so factors such as the actual on-site icing thickness, ground wire icing thickness differential value, micro-meteorology and micro-topography of fault section should be taken into consideration to ensure operation of the line.
        Key words: ±800 kV ultra-high voltage DC line; ground wire; icing; disconnection; fault analysis
     
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