谢成,金涌涛,胡叶舟,童力
XIE Cheng,JIN Yongtao,HU Yezhou,TONG Li

• 1:国网浙江省电力公司电力科学研究院

摘要(Abstract)：

对于小电流接地系统配电网单相接地故障,现有的检测方法和选线装置在实际工程应用中状况并不理想。研究了基于暂态零序电流波形相关系数分析的研判原理,采用故障指示器录波结合配电线路在线监测系统主站研判的方式实现了单相接地故障的选线与定位,并通过单相接地人工模拟试验综合评判了该方法的准确性和适用性。试验结果及分析表明,该系统能够准确、快速地对接地电阻不大于1 000Ω的单相接地故障进行故障定位和信息报送,选线成功率达90%。对于经更高电阻接地等暂态特征不明显的单相接地故障,建议采用零序电流有功分量比较作为有效补充,或采用基于多原理、多判据的综合方法,以提高单相接地故障的诊断率。
There exist multiple detection methods and line selection equipment for single-phase-to-earth fault of distribution networks with low current grounding system; however, their application is not satisfying in engineering practice. In this paper, the principle of correlation coefficient analysis of transient zero-sequence current wave is introduced. Through recorder of fault indicator and the analysis of on-line monitoring system of overhead lines, the selection and location of single-phase-to-earth fault line is thus realized; moreover, correctness and applicability of the method is determined by simulation test of single-phase grounding. The test result and analysis show that the system can precisely and rapidly locate and report single-phase grounding faults with the grounding resistance less than 1 000 Ω and line selection rate up to 90%. For single-phase grounding faults in case of larger ground resistance with unobvious transient characteristics, the paper suggests adopting comparison of active component of zero-sequence current as a supplement or an integrated method based on multiple principles and criteria to improve diagnosis rate of single-phase grounding faults.

关键词(KeyWords)： 配电网;单相接地;暂态零序电流;相关系数;故障定位;选线
distribution network;single-phase grounding;transient zero-sequence current;correlation coefficient;fault location;selection

Abstract:

Keywords:

基金项目(Foundation):

作者(Author): 谢成,金涌涛,胡叶舟,童力
XIE Cheng,JIN Yongtao,HU Yezhou,TONG Li

DOI: 10.19585/j.zjdl.2017.03.005

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