Suzhou Electric Appliance Research Institute
期刊號: CN32-1800/TM| ISSN2097-6623

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基于相電流的消弧線圈接地系統(tǒng)單相接地故障選線

來源:電工電氣發(fā)布時間:2026-02-26 08:26 瀏覽次數:1

基于相電流的消弧線圈接地系統(tǒng)單相接地故障選線

郝金寶,洪晨威,王亮,王鵬,徐挺,彭純
(國網江蘇省電力有限公司蘇州供電分公司,江蘇 蘇州 215004)
 
    摘 要:目前消弧線圈接地系統(tǒng)實際運行中,對單相接地故障暫態(tài)量、零序量等采集能力不足,從而導致選線效率低下。提出一種僅基于各線路三相電流數據的單相接地選線算法。對單相接地故障進行了原理分析,指出接地故障時三相電流的變化特征;根據故障前后接地相電流相對于正常相電流的變化情況,提出了比值法和差值法兩種選線指標,并基于線路的平均電流對兩種指標的置信度進行了賦值,接著構造函數為指標計算所依據的各時刻電流數據源進行了權重分配。實際故障案例驗證表明,所提算法在單相接地故障特別是單相金屬性接地故障中具有較高的選線準確率,可以顯著提升調度員事故處理的效率,降低設備改造成本和停電損失。
    關鍵詞: 消弧線圈接地系統(tǒng);單相接地;故障選線;相電流;比值法;差值法
    中圖分類號:TM475     文獻標識碼:A     文章編號:2097-6623(2026)02-0059-06
 
A Single-Phase Grounding Fault Line Selection for the Arc Suppression Coil
Grounding System Based on Phase Current
 
HAO Jin-bao, HONG Chen-wei, WANG Liang, WANG Peng, XU Ting, PENG Chun
(State Grid Jiangsu Electric Power Co., Ltd. Suzhou Power Supply Company, Suzhou 215004, China)
 
    Abstract: At present, in the actual operation of arc suppression coil grounding systems, the insufficient ability to collect transient quantities, zero-sequence quantities and other parameters of single-phase grounding faults leads to low efficiency of fault line selection. An algorithm for single-phase grounding fault line selection based only on the three-phase current data of each line is proposed in this paper. The principle of single-phase grounding fault is analyzed, and the variation characteristics of three-phase current during grounding fault are pointed out. According to the changes of the grounding phase current relative to the normal phase current before and after the fault, two line selection indicators, namely the ratio method and the difference method are proposed. The confidence levels of the two indicators are assigned based on the average current of the line, and then a function is constructed to assign weights to the current data sources at each moment for indicator calculation. Verification with actual fault cases shows that the proposed algorithm has a high accuracy of line selection in single-phase grounding faults, especially in single-phase metallic grounding faults. It can significantly improve the efficiency of dispatchers in accident handling, and reduce the cost of equipment transformation and power outage losses.
    Key words: arc suppression coil grounding system; single-phase grounding; fault line selection; phase current; ratio method; difference method
 
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