10kV配电线路单相树线故障选相研究  

Fault phase selection of a single-phase tree-line in a 10 kV distribution line

作　　者：杨森[1] 陈天翔 邵千秋 王孟 陈龙[1] 杨龙山 YANG Sen;CHEN Tianxiang;SHAO Qianqiu;WANG Meng;CHEN Long;YANG Longshan(Chengdu University of Technology,Chengdu 610059,China;State Grid Sichuan Electric Power Research Institute,Chengdu 610041,China)

机构地区：[1]成都理工大学,四川成都610059 [2]国网四川省电力公司电力科学研究院,四川成都610041

出　　处：《电力系统保护与控制》2024年第18期169-178,共10页Power System Protection and Control

基　　金：国家自然科学区域创新发展联合基金重点支持项目资助(U19A2080);四川省自然科学基金青年基金项目资助(2023NSFSC0827);四川省电力公司科技项目资助(521903230001)。

摘　　要：针对配电网三相电压不平衡发生树-线故障难以准确判别故障相而引发山火的问题,提出了一种基于电压信号突变值和变化趋势相结合的选相方法。在传统三相电压平衡配电网单相接地故障选相理论基础上,搭建了10 kV单相树-线故障试验平台。首先,在中性点不接地、消弧线圈接地欠补偿和过补偿3种情况下进行了多种树木、不同残余电流单相树-线故障试验研究。然后,根据树-线故障时零序电压和各相电压幅值变化特征,定义了故障时刻及故障相识别码,建立了某一相电压有效值的幅值增加最大则其滞后相为故障相的判据。通过故障时刻前后0.1 s内的各相电压平均有效值改变大小对比及相应判据,将生成对应的识别码进行匹配,实现精确快速判别故障相。最后,通过试验验证该方法能够有效解决单相树-线故障相识别问题且不受电压不平衡影响,具有较好的工程应用价值。It is difficult to accurately identify the fault phase and cause of wildfires due to a tree-line fault of three-phase voltage imbalance in a distribution network.Thus a phase selection method based on the combination of voltage signal mutation value and change trend is proposed.Based on the phase selection theory of a single-phase grounding fault in a traditional three-phase voltage balanced distribution network,a 10 kV single-phase tree-line fault test platform is built.First,a single-phase tree-line fault test of various trees and different residual currents is carried out under three conditions of neutral point ungrounded,under compensation and over compensation of arc suppression coil grounding.Then,from the variation characteristics of zero sequence voltage and phase voltage amplitude during a tree-line fault,the fault time and fault phase identification code are defined,and the criterion that the lag phase is the fault phase is established when the amplitude of the effective value of a phase voltage increases the most.By comparing and judging the change of the average effective value of each phase voltage within 0.1 s before and after the fault time,the corresponding identification code is generated for matching to achieve accurate and rapid identification of the fault phase.Finally,it is verified by experiment that this method can effectively solve the problem of fault phase identification of a single-phase tree-line fault and is not affected by voltage imbalance.This has good engineering application value.

关 键 词：配电网 树-线故障 电压突变 故障选相 

分 类 号：TM862[电气工程—高电压与绝缘技术]