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期刊号: CN32-1800/TM| ISSN1007-3175

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一起10 kV线路跳闸故障分析

来源:电工电气发布时间:2021-07-20 09:20浏览次数:462

一起10 kV线路跳闸故障分析

邓晨1,单婷婷2,许超1,胡善芝1
(1 国网江苏省电力有限公司南京供电分公司,江苏 南京 210019;
2 东南大学 电气工程学院,江苏 南京 210096)
 
    摘 要:介绍了一起两系统采用不同接地方式时,其间一条 10 kV 联络线跳闸的故障,阐述了中性点经消弧线圈接地与电阻接地的两种系统互相转供时保护不匹配的问题。通过分析故障起因及处理过程,对故障进行复盘和计算。针对此类较为特殊的故障提出多种针对性解决方案,比较优劣,得出了最适合于当下配网运行的解决方案。
    关键词:零序保护;小电阻接地系统;保护不匹配
    中图分类号:TM75     文献标识码:B     文章编号:1007-3175(2021)07-0034-05
 
Analysis of a 10 kV Line Tripping Fault
 
DENG Chen1, SHAN Ting-ting2, XU Chao1,HU Shan-zhi1
(1 Nanjing Power Supply Company, State Grid Jiangsu Electric Power Co., Ltd, Nanjing 210019, China;
2 School of Electrical Engineering, Southeast University, Nanjing 210096, China)
 
    Abstract: Through introducing the happening of a 10 kV tie line tripping fault when two systems use different grounding methods, this paper elaborates the problem of protection mismatch when arc-suppression-coil neutral system and resistance ground neutral system are transferred to each other. After analyzing the causes of this fault and the working process, the fault is reviewed and calculated. A variety of targeted solutions are put forward for these special faults, and currently the best feasible distribution network operation is obtained through
comparing the advantages and disadvantages of different solutions.
    Key words: zero sequence protection; low resistance grounding system; protection mismatch
 
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