摘要
目前配电网系统中性点接地方式主要以小电流接地为主,但在单相接地故障的选线中依然存在选线准确率和可靠性的问题,特别是当线路中存在不平衡电流或线路中含多次谐波干扰时,单一故障判据往往无法满足所有线路情况,会出现选线误判。为此首先分析了小电流接地系统单相接地的特征,提出了针对不同特征的单相故障选线判据,再利用多故障判据融合并结合多线路故障差异性赋予不同权重,最终通过仿真验证了这种方式相较于单一选线判据,准确率和可靠性均有一定程度提高。
At present,the neutral point grounding method of the distribution network system is mainly based on small current grounding.However,the accuracy and reliability of line selection still exist in the line selection of single-phase grounding fault.Especially when there is unbalanced current in the line or multiple harmonic interference in the line,the single fault criterion often cannot meet all line conditions,and misjudgment of line selection will occur.Firstly,the characteristics of single-phase grounding in small current grounding system are analyzed,and the single-phase fault line selection criteria for different characteristics are proposed.Then the multi fault criterion fusion is used and combined with the difference of multi line faults,different weights are given.Finally,the simulation results show that this method has a certain degree of improvement in accuracy and reliability compared with a single line selection criterion.
作者
叶伟权
YE Weiquan(Guangzhou Power Supply Bureau,Guangdong Power Grid Co.,Ltd.,Guangzhou 510400,China)
出处
《电工技术》
2022年第11期7-9,共3页
Electric Engineering
关键词
故障选线
小电流接地系统
单相接地
故障特征
fault line selection
small current grounding system
single phase grounding
fault characteristics
作者简介
叶伟权(1977-),研究方向为输配电在线监测技术。
